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BRINGING FORWARD DISCOVERYIN AUSTRALIArsquoS NORTHERN TERRITORY

A09-093indd

REVIEW OF EXPLORATION RESULTS AND PETROLEUM POTENTIAL IN THE NTPI7 AND

OP 162 PERMITS (NORTHWESTERN AUSTRALIA)

s Mulle - K Creevey JANUARY 1971

SUMMARY

PAGE

A GEOLGICAL FRAMEWORK 1

B EXPLORATION HISTORY 1

1 Geophysics 1 2 Exploration Wells 2

C EVALUATION OF THE PETROLEUM POTENTIAL IN THE ONSHORE OP 162 3

l Stratigraphic objectives 3 2 Structures 4 3 COnclusion 4

D EVALUATION OF THE PETROLEUM POTENTIAL IN THE NTP17 4

1- Stratigraphic objectives 4 2 Structures 5 3 Conclusion 6

APPENDIX

I PERMIT INFORMATION ON NTp17 7

II PERMIT INFORMATION ON OP 162 7

III PERMIT INFORMATION ON WA-12-P 8

FIGURES

1

2

3

41

42

43

44

5

PLATES

l

2

3

4

5

6

7

8

9

10

Enclosure

LIST OF FIGURES AND PLATES

Geological Framework

Permit situation map of NT P17

Permit situation map of OP 162

Well log of Keep river 1

Well log of Kulshill 1

Well log of Lacrosse 1

Well log of Petrel 1

Predicted Section of Bougainville 1 well

Aeromagnetic map

Geological and Prospect map

Diagrammatic cross sections through the Bonaparte Gulf (31 and 32)

Structural and stratigraphic cross section Kulshill 1 to Petrel 1

Isochron contour map of horizon 5

Isopach contour map of interval 4 to 5

Isopach contour map of interval 5 to 7

Isochron contour map of horizon 5 on Bougainville structure

Seismic section lines B03 - H22

Shot point location map

The Providence Hill Prospect

Review of Exploration results and Petroleum potential in the NTPI and

bp 162 permits (Northwestern Australia)

A Geological Frameworkmiddot

The NTPI and OP 162 permits lie in the Eastern part of the Bonaparte Gulf sedimentary basin

structurally this basin corresponds to a broad U-shaped depression of pericratonic type deeply downwarped between landmasses of Precambrian age (see fig 1)

the Kimberley block to the Southwest

the Sturt Block to the East separated from the previous one by a 50 mile wide fault zone called the Halls Creek Mobile zone

the submerged Van Diemen High to the North East

Tectonic activity in this basin is characterised by general downwarping accompanied with step-faulting seawards tilting and vertical movements of probable salt origin These epeirogenic movements combined with salt tectonism originated fold and fault structures with major SE to NW trends

The Bonaparte basin was the site of an active subsidence that resulted in the deposition of up to 15000 feet of Tertiary and Mesozoic and possibly more than 20000 feet of Paleozoic sediments

B Exploration History

1 Geophysics

Offshore aeromagnetic surveys were carried out in the Timor Sea in 1965 The contours of interpreted maps portray the broad basin opening to the Northwest as outlined above They also show the regional feature of the submerged Van Diemen High which forms the Northeastern edge of the basin in the NTPl7

A number of seismic surveys were carried out onshore and offshore The detail of exploration in the OP 162 is given in the brochure Review of the exploration carried out to date in Oil Permit OP 162 (Onshore) NT

Marinemiddotseismic surveys were carried out in the Timor Sea area by Arco andor Aquitaine in 1964 19ij~middot1966i~196 ailltll968

Initial offshore seismic in the NTPl area was carried out in the Queens Channel area in 1961 by Seismograph Service Ltd for the Associated Group This showed an increasing sedimentary section from Cape Domby to Quoin Island

AUSTRALIAN AQUITAINE PETROLEUM PTY LTD -FIG 1

NT PI7 and OP 162

LOCATION MAP

bull

124 12 JAN 1971

t_

-shyI- bull

GEOLOGICAL SETTING

(After Veemiddoters ond Roberts)

- shy

2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

0en iii shy~ I shy ()a 0 -(I)

ct raquo Q) NTP4

) (f) en N If)W

a 0 s () c52 0

Lshy Q)(I) 0 a en

l- e C 0 0

(I) shy(I) gt- Ishy~ 0

I) -0

al U

Q) L- bull1 0

E ~ c0 en

- L- -0(I)GI shya a

gt I shy0 (1) Q)

OFfop I E S E LshyI- 3 0

12deg 30OO~ 12deg 3000 t 11 11 12go50 00 129deg5500

0 ciLtJ _(f)W Z lt1lt1 00 CD

C) N

130-~i------- aI

~ z 0 w -cI a ~ lti Q 5 ltI 0

w 0 ltI

I i Vl aLtJ LtJ~ zltt ~o a

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I)

1 NTPI

~ rshy

I shyz~ NLtJo OLtJ I

ai~ u IP

I shycD N

TERRITORY -Q) I shy

~ 0 3 s EE gtt laquo ~ - 0shy

W -0 -2 i IIgt ~a Qgt

I) (1) I)laquo 0 - () CD I)~00

~ 0 ~ ilt)

a w CJ LtJ -J Z c0 ltI ltir

WESTERN AUSTRALIA ltIw 5 J 0 ltI13OllO

r- T I

REVIEW OF EXPLORATION RESULTS AND PETROLEUM POTENTIAL IN THE NTPI7 AND

OP 162 PERMITS (NORTHWESTERN AUSTRALIA)

s Mulle - K Creevey JANUARY 1971

SUMMARY

PAGE

A GEOLGICAL FRAMEWORK 1

B EXPLORATION HISTORY 1

1 Geophysics 1 2 Exploration Wells 2

C EVALUATION OF THE PETROLEUM POTENTIAL IN THE ONSHORE OP 162 3

l Stratigraphic objectives 3 2 Structures 4 3 COnclusion 4

D EVALUATION OF THE PETROLEUM POTENTIAL IN THE NTP17 4

1- Stratigraphic objectives 4 2 Structures 5 3 Conclusion 6

APPENDIX

I PERMIT INFORMATION ON NTp17 7

II PERMIT INFORMATION ON OP 162 7

III PERMIT INFORMATION ON WA-12-P 8

FIGURES

1

2

3

41

42

43

44

5

PLATES

l

2

3

4

5

6

7

8

9

10

Enclosure

LIST OF FIGURES AND PLATES

Geological Framework

Permit situation map of NT P17

Permit situation map of OP 162

Well log of Keep river 1

Well log of Kulshill 1

Well log of Lacrosse 1

Well log of Petrel 1

Predicted Section of Bougainville 1 well

Aeromagnetic map

Geological and Prospect map

Diagrammatic cross sections through the Bonaparte Gulf (31 and 32)

Structural and stratigraphic cross section Kulshill 1 to Petrel 1

Isochron contour map of horizon 5

Isopach contour map of interval 4 to 5

Isopach contour map of interval 5 to 7

Isochron contour map of horizon 5 on Bougainville structure

Seismic section lines B03 - H22

Shot point location map

The Providence Hill Prospect

Review of Exploration results and Petroleum potential in the NTPI and

bp 162 permits (Northwestern Australia)

A Geological Frameworkmiddot

The NTPI and OP 162 permits lie in the Eastern part of the Bonaparte Gulf sedimentary basin

structurally this basin corresponds to a broad U-shaped depression of pericratonic type deeply downwarped between landmasses of Precambrian age (see fig 1)

the Kimberley block to the Southwest

the Sturt Block to the East separated from the previous one by a 50 mile wide fault zone called the Halls Creek Mobile zone

the submerged Van Diemen High to the North East

Tectonic activity in this basin is characterised by general downwarping accompanied with step-faulting seawards tilting and vertical movements of probable salt origin These epeirogenic movements combined with salt tectonism originated fold and fault structures with major SE to NW trends

The Bonaparte basin was the site of an active subsidence that resulted in the deposition of up to 15000 feet of Tertiary and Mesozoic and possibly more than 20000 feet of Paleozoic sediments

B Exploration History

1 Geophysics

Offshore aeromagnetic surveys were carried out in the Timor Sea in 1965 The contours of interpreted maps portray the broad basin opening to the Northwest as outlined above They also show the regional feature of the submerged Van Diemen High which forms the Northeastern edge of the basin in the NTPl7

A number of seismic surveys were carried out onshore and offshore The detail of exploration in the OP 162 is given in the brochure Review of the exploration carried out to date in Oil Permit OP 162 (Onshore) NT

Marinemiddotseismic surveys were carried out in the Timor Sea area by Arco andor Aquitaine in 1964 19ij~middot1966i~196 ailltll968

Initial offshore seismic in the NTPl area was carried out in the Queens Channel area in 1961 by Seismograph Service Ltd for the Associated Group This showed an increasing sedimentary section from Cape Domby to Quoin Island

AUSTRALIAN AQUITAINE PETROLEUM PTY LTD -FIG 1

NT PI7 and OP 162

LOCATION MAP

bull

124 12 JAN 1971

t_

-shyI- bull

GEOLOGICAL SETTING

(After Veemiddoters ond Roberts)

- shy

2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

0en iii shy~ I shy ()a 0 -(I)

ct raquo Q) NTP4

) (f) en N If)W

a 0 s () c52 0

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SUMMARY

PAGE

A GEOLGICAL FRAMEWORK 1

B EXPLORATION HISTORY 1

1 Geophysics 1 2 Exploration Wells 2

C EVALUATION OF THE PETROLEUM POTENTIAL IN THE ONSHORE OP 162 3

l Stratigraphic objectives 3 2 Structures 4 3 COnclusion 4

D EVALUATION OF THE PETROLEUM POTENTIAL IN THE NTP17 4

1- Stratigraphic objectives 4 2 Structures 5 3 Conclusion 6

APPENDIX

I PERMIT INFORMATION ON NTp17 7

II PERMIT INFORMATION ON OP 162 7

III PERMIT INFORMATION ON WA-12-P 8

FIGURES

1

2

3

41

42

43

44

5

PLATES

l

2

3

4

5

6

7

8

9

10

Enclosure

LIST OF FIGURES AND PLATES

Geological Framework

Permit situation map of NT P17

Permit situation map of OP 162

Well log of Keep river 1

Well log of Kulshill 1

Well log of Lacrosse 1

Well log of Petrel 1

Predicted Section of Bougainville 1 well

Aeromagnetic map

Geological and Prospect map

Diagrammatic cross sections through the Bonaparte Gulf (31 and 32)

Structural and stratigraphic cross section Kulshill 1 to Petrel 1

Isochron contour map of horizon 5

Isopach contour map of interval 4 to 5

Isopach contour map of interval 5 to 7

Isochron contour map of horizon 5 on Bougainville structure

Seismic section lines B03 - H22

Shot point location map

The Providence Hill Prospect

Review of Exploration results and Petroleum potential in the NTPI and

bp 162 permits (Northwestern Australia)

A Geological Frameworkmiddot

The NTPI and OP 162 permits lie in the Eastern part of the Bonaparte Gulf sedimentary basin

structurally this basin corresponds to a broad U-shaped depression of pericratonic type deeply downwarped between landmasses of Precambrian age (see fig 1)

the Kimberley block to the Southwest

the Sturt Block to the East separated from the previous one by a 50 mile wide fault zone called the Halls Creek Mobile zone

the submerged Van Diemen High to the North East

Tectonic activity in this basin is characterised by general downwarping accompanied with step-faulting seawards tilting and vertical movements of probable salt origin These epeirogenic movements combined with salt tectonism originated fold and fault structures with major SE to NW trends

The Bonaparte basin was the site of an active subsidence that resulted in the deposition of up to 15000 feet of Tertiary and Mesozoic and possibly more than 20000 feet of Paleozoic sediments

B Exploration History

1 Geophysics

Offshore aeromagnetic surveys were carried out in the Timor Sea in 1965 The contours of interpreted maps portray the broad basin opening to the Northwest as outlined above They also show the regional feature of the submerged Van Diemen High which forms the Northeastern edge of the basin in the NTPl7

A number of seismic surveys were carried out onshore and offshore The detail of exploration in the OP 162 is given in the brochure Review of the exploration carried out to date in Oil Permit OP 162 (Onshore) NT

Marinemiddotseismic surveys were carried out in the Timor Sea area by Arco andor Aquitaine in 1964 19ij~middot1966i~196 ailltll968

Initial offshore seismic in the NTPl area was carried out in the Queens Channel area in 1961 by Seismograph Service Ltd for the Associated Group This showed an increasing sedimentary section from Cape Domby to Quoin Island

AUSTRALIAN AQUITAINE PETROLEUM PTY LTD -FIG 1

NT PI7 and OP 162

LOCATION MAP

bull

124 12 JAN 1971

t_

-shyI- bull

GEOLOGICAL SETTING

(After Veemiddoters ond Roberts)

- shy

2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

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130deg30

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130-~i------- aI

~ z 0 w -cI a ~ lti Q 5 ltI 0

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WESTERN AUSTRALIA ltIw 5 J 0 ltI13OllO

r- T I

FIGURES

1

2

3

41

42

43

44

5

PLATES

l

2

3

4

5

6

7

8

9

10

Enclosure

LIST OF FIGURES AND PLATES

Geological Framework

Permit situation map of NT P17

Permit situation map of OP 162

Well log of Keep river 1

Well log of Kulshill 1

Well log of Lacrosse 1

Well log of Petrel 1

Predicted Section of Bougainville 1 well

Aeromagnetic map

Geological and Prospect map

Diagrammatic cross sections through the Bonaparte Gulf (31 and 32)

Structural and stratigraphic cross section Kulshill 1 to Petrel 1

Isochron contour map of horizon 5

Isopach contour map of interval 4 to 5

Isopach contour map of interval 5 to 7

Isochron contour map of horizon 5 on Bougainville structure

Seismic section lines B03 - H22

Shot point location map

The Providence Hill Prospect

Review of Exploration results and Petroleum potential in the NTPI and

bp 162 permits (Northwestern Australia)

A Geological Frameworkmiddot

The NTPI and OP 162 permits lie in the Eastern part of the Bonaparte Gulf sedimentary basin

structurally this basin corresponds to a broad U-shaped depression of pericratonic type deeply downwarped between landmasses of Precambrian age (see fig 1)

the Kimberley block to the Southwest

the Sturt Block to the East separated from the previous one by a 50 mile wide fault zone called the Halls Creek Mobile zone

the submerged Van Diemen High to the North East

Tectonic activity in this basin is characterised by general downwarping accompanied with step-faulting seawards tilting and vertical movements of probable salt origin These epeirogenic movements combined with salt tectonism originated fold and fault structures with major SE to NW trends

The Bonaparte basin was the site of an active subsidence that resulted in the deposition of up to 15000 feet of Tertiary and Mesozoic and possibly more than 20000 feet of Paleozoic sediments

B Exploration History

1 Geophysics

Offshore aeromagnetic surveys were carried out in the Timor Sea in 1965 The contours of interpreted maps portray the broad basin opening to the Northwest as outlined above They also show the regional feature of the submerged Van Diemen High which forms the Northeastern edge of the basin in the NTPl7

A number of seismic surveys were carried out onshore and offshore The detail of exploration in the OP 162 is given in the brochure Review of the exploration carried out to date in Oil Permit OP 162 (Onshore) NT

Marinemiddotseismic surveys were carried out in the Timor Sea area by Arco andor Aquitaine in 1964 19ij~middot1966i~196 ailltll968

Initial offshore seismic in the NTPl area was carried out in the Queens Channel area in 1961 by Seismograph Service Ltd for the Associated Group This showed an increasing sedimentary section from Cape Domby to Quoin Island

AUSTRALIAN AQUITAINE PETROLEUM PTY LTD -FIG 1

NT PI7 and OP 162

LOCATION MAP

bull

124 12 JAN 1971

t_

-shyI- bull

GEOLOGICAL SETTING

(After Veemiddoters ond Roberts)

- shy

2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

0en iii shy~ I shy ()a 0 -(I)

ct raquo Q) NTP4

) (f) en N If)W

a 0 s () c52 0

Lshy Q)(I) 0 a en

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Review of Exploration results and Petroleum potential in the NTPI and

bp 162 permits (Northwestern Australia)

A Geological Frameworkmiddot

The NTPI and OP 162 permits lie in the Eastern part of the Bonaparte Gulf sedimentary basin

structurally this basin corresponds to a broad U-shaped depression of pericratonic type deeply downwarped between landmasses of Precambrian age (see fig 1)

the Kimberley block to the Southwest

the Sturt Block to the East separated from the previous one by a 50 mile wide fault zone called the Halls Creek Mobile zone

the submerged Van Diemen High to the North East

Tectonic activity in this basin is characterised by general downwarping accompanied with step-faulting seawards tilting and vertical movements of probable salt origin These epeirogenic movements combined with salt tectonism originated fold and fault structures with major SE to NW trends

The Bonaparte basin was the site of an active subsidence that resulted in the deposition of up to 15000 feet of Tertiary and Mesozoic and possibly more than 20000 feet of Paleozoic sediments

B Exploration History

1 Geophysics

Offshore aeromagnetic surveys were carried out in the Timor Sea in 1965 The contours of interpreted maps portray the broad basin opening to the Northwest as outlined above They also show the regional feature of the submerged Van Diemen High which forms the Northeastern edge of the basin in the NTPl7

A number of seismic surveys were carried out onshore and offshore The detail of exploration in the OP 162 is given in the brochure Review of the exploration carried out to date in Oil Permit OP 162 (Onshore) NT

Marinemiddotseismic surveys were carried out in the Timor Sea area by Arco andor Aquitaine in 1964 19ij~middot1966i~196 ailltll968

Initial offshore seismic in the NTPl area was carried out in the Queens Channel area in 1961 by Seismograph Service Ltd for the Associated Group This showed an increasing sedimentary section from Cape Domby to Quoin Island

AUSTRALIAN AQUITAINE PETROLEUM PTY LTD -FIG 1

NT PI7 and OP 162

LOCATION MAP

bull

124 12 JAN 1971

t_

-shyI- bull

GEOLOGICAL SETTING

(After Veemiddoters ond Roberts)

- shy

2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

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AUSTRALIAN AQUITAINE PETROLEUM PTY LTD -FIG 1

NT PI7 and OP 162

LOCATION MAP

bull

124 12 JAN 1971

t_

-shyI- bull

GEOLOGICAL SETTING

(After Veemiddoters ond Roberts)

- shy

2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

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2

The Queens Channel Seismic Survey in 1964 confirmed the thicknesses and detected a small structure suspected from previous gravity work The Flat Top Bank Marine seismic Survey carried out also in 1964 in the north of the permit showed that although undisturbed in this area the Bonaparte Gulf Basin was thickening and steadily deepening to the west

Three main horizons could be followed continuously assumed to represent Mesozoic Triassic and Permian horizons respectively Some indications of structure were found and the Cape Hay - Cape Ford seismic programme of 1966 concentrated on these indications Several possible structures were found notably one on the central western border of the permit (B see Encl2) The most noticeable features appearing from this survey were these apparent intrusive like structures in the offshore Cape Scott to Pearce Point areas

The Hyland seismic Programme carried out in 1967 detailed a number of these intrusive type structures (See prospect map Horizon 5) and confirmed the thin sedimentary section on the northern part of the permit

2 Exploration Wells

Onshore

Bonaparte 1 was spudded in 1963 for ADD The well reached a total depth of 10530 feet without encountering hydrocarbons and was abandoned as a dry hole in June 1964 A seismic survey indicated that the well had been located on the northeast flank of a structure and a second well Bonaparte 2 was drilled on the crest of this structure

Bonaparte 2 was spudded in July 1964 The well reached the total ~epth of 7008 feet after drilling through Lower Permian and Lower Carboniferous Strong flows of up to 15 MMCFD of wet gas were recorded from a thin Carboniferous sandstone during testing of the 4712 to 4819 feet interval Although the flow was substantial it was considered non-commercial and the well was plugged and abandoned

Kulshill No1 was drilled from June 1965 to June 1966 and reached total depth at 14416 feet in the Upper Devonian Cockatoo Formation Good resershyvoirs were encountered in the Lower Permian and in the upper part of the Lower Carboniferous (Tanmurra Formation) bull Shows of oil and gas were encountered at various levels in the stratigraphic column but restricted to impermeable parts of the reservoir and no commercial accummulation was found

Knlshill No2 was drilled from June to August 1966 and reached total depth at 6432 feet in Lower Carboniferous The purpose of this well was to test the Tanmurra Reservoir in a higher structural position than in Kulshill No 1 but again the oil shows were restricted to impermeable beds and only salt water was produced on test from associated reservoirs

Moyle No1 was drilled from July to August 1966 and reached total depth at 1767 feet in basement The purpose of this well was to test the stratishygraphic section between the outcropping Proterozoic basement and the northshytrending fault system outlined by seismic and gravity surveys in 1964 and 1966 The well drilled a non-prospective section of 1695 feet of Lower Permian directly overlying basement and was abandoned as a dry hole

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

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ct raquo Q) NTP4

) (f) en N If)W

a 0 s () c52 0

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gt I shy0 (1) Q)

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C) N

130-~i------- aI

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w 0 ltI

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TERRITORY -Q) I shy

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WESTERN AUSTRALIA ltIw 5 J 0 ltI13OllO

r- T I

3

Keep River No1 was drilled from September 1968 to March 1969 and reached total depth at 15623 feet in probable Cockatoo Fermation of Upper Devonian age The well drilled through a thick section of Lower Carboniferous and more than 3000 feet of the Upper Devonian Ninbing Reef limestones A drill stem test produced a substantial flow of dry gas from the interval 8611 feet to 11000 feet but no commercial accumulation was found

Offshore

Lacrosse No1 was the first offshore exploration well in the Bonaparte Gulf It was spudded in February 1969 and was drilled for the Alliance-Arco group from the semi-submersible Sedco l35G rig The well reached a total depth of 10020 feet in the Lower Carboniferous after drilling through an essentially Lower Permian section shows of oil were recorded during testing in the 5635 to 5770 feet interval in the Lower Permian but were not consideredshycommercial Good potential reservoirs were encountered in the upper part of the section

Petrel 1 was spudded in May 1969 100 miles north of Lacrosse No1 The well was drilled for the Arco-Aquitaine group from the Sedco l35G The well was drilled on a large gently folded anticline with well-established closure The structure is located in the central part of the basin where the Bonaparte Gulf opens into the Timor Sea

After drilling through a thick sequence of sediments ranging in age from Paleocene to Permian the well penetrated a high pressure gas zone in the Permian at 13057 feet A gas blowout occurred and control of the well was lost

In addition to the occurrence of dry gas in the Permian this well showed good potential reservoirs and source rocks in the Mesozoic these considerably upgrading the prospects of finding commercial accumulations of hydrocarbons in the Bonaparte Gulf Basin

Newby 1 and Flat Top 1 were two shallow wells drilled in the NTP17 between December 1969 and February 1970 The aim of these wells was to investigate regional stratigraphic features on the edge of the Van Diemen High

Newby 1 was drilled to 3768 feet and bottomed in Proterozoic basement whereas Flat Top No1 was ended at 7131 feet in a Pre-Mesozoic quartzite of an undetermined age No hydrocarbons weremiddot encountered in these two wells but the results were of a significant help in the understanding of the regional geology in the northern part of the NTP17 and in the evaluation of its petroleum potential

C Evaluation of Petroleum potential in the onshore OP 162

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective formations in the OP 162 lie within the Lower Permian the Lower Carboniferous and the Upper Devonian The whole sequence totals about 20000 feet of sediment

Reservoirs and cap rocks exist They include alternating sandstones and shales in the Lower Permian and the Lower Carboniferous limestones in the lower part of the Lower Carboniferous and in the Upper Devonian Nearly all

-- these sediments were deposited in paralic to shallow marine environment In addition to shows of gas and oil encountered in wells some of the formations have shown good source rock characteristics either for ga$ or for oil

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

0en iii shy~ I shy ()a 0 -(I)

ct raquo Q) NTP4

) (f) en N If)W

a 0 s () c52 0

Lshy Q)(I) 0 a en

l- e C 0 0

(I) shy(I) gt- Ishy~ 0

I) -0

al U

Q) L- bull1 0

E ~ c0 en

- L- -0(I)GI shya a

gt I shy0 (1) Q)

OFfop I E S E LshyI- 3 0

12deg 30OO~ 12deg 3000 t 11 11 12go50 00 129deg5500

0 ciLtJ _(f)W Z lt1lt1 00 CD

C) N

130-~i------- aI

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w 0 ltI

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I)

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I shycD N

TERRITORY -Q) I shy

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~ 0 ~ ilt)

a w CJ LtJ -J Z c0 ltI ltir

WESTERN AUSTRALIA ltIw 5 J 0 ltI13OllO

r- T I

4

In the Port Keats area the main objectives are the basal sandstone of the Lower Permian and the Tanmurra sandstone in the upper part of the Lower Carboniferous These reservoirs have yielded salt water whereas shows of oil and gas have been observed from impermeable interbedded members This would appear to indicate flushing probably towards the deeper parts of the basin in the west and away from the intake areas

In the Keep River area the main objectives are the Upper Devonian Ninbing Reef Limestones and the overlying Lower Carboniferous Burt Range and Milligan Formations These last formations produced dry gas flows (see lithological log Keep River 1) probably from sandstone reservoirs of limited

extent The limestones encountered in Keep River 1 were tight prospects of this area appear to lie in the discovery of porous reef limestones in the Devonian and sandstone reservoirs of greater volume in the Carboniferous

2 structures

At the moment one structure is ready to be drilled It is the Providence Hill structure located 8 miles west of Kulshill No1 in the Port Keats area This structure appears as asubcircular anticline affected by radial faulting

Two objectives are considered attractive (see log of Kulshill 1)

the top of the basal silicified sandstone in the Kulshill formation (6000 - 6500) (Lower Permian)

the Tanmurra Sandstone (8000 - 9000) (Lower Carboniferous)

~oth units were porous and permeable in the Kulshill 1 well where they provided oil and gas shows

The volume of closed rock in the structure is about 2500000 acre-foot

3 Conclusion

The existence of petroleum potential and that of a well-defined structure have been demonstrated For other prospects in other areas in this permit it is now a matter of more accurate approach to define new well site locations this possibly requiring some additional geophysical andor geological work

D Evaluation of the Petroleum potential in the NTP17

1 Stratigraphic objectives (see enclosed lithologic well logs)

The prospective sediments in the NTP17 lie mainly within the Permian and Carboniferous sequence which totals more than 15000 feet of sediment

The Mesozoic is either eroded or too shallow to be considered prospective unless stratigraphic targets can be localized Sediments older than the Lower Carboniferous are likely to be too deep except on a belt of undetermined width in the northern and southern parts of the permit where possible Devonian reefs may be reached at reasonable depths

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

0en iii shy~ I shy ()a 0 -(I)

ct raquo Q) NTP4

) (f) en N If)W

a 0 s () c52 0

Lshy Q)(I) 0 a en

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E ~ c0 en

- L- -0(I)GI shya a

gt I shy0 (1) Q)

OFfop I E S E LshyI- 3 0

12deg 30OO~ 12deg 3000 t 11 11 12go50 00 129deg5500

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C) N

130-~i------- aI

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w 0 ltI

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I)

1 NTPI

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ai~ u IP

I shycD N

TERRITORY -Q) I shy

~ 0 3 s EE gtt laquo ~ - 0shy

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~ 0 ~ ilt)

a w CJ LtJ -J Z c0 ltI ltir

WESTERN AUSTRALIA ltIw 5 J 0 ltI13OllO

r- T I

5

The Permo-Carboniferous sequence contains a number of good sandstone reservoirs whi~h were found in the various wells drilled in and around the permit At least four of them can be listed here

the Tanmurra sandstone in the upper part of the Lower Carboniferous

the basal sandstone of the Kulshill formation in the Lower Permian

the Greywacke-Sugarloaf sandstone of the Kulshill formation

the Fossil Head sandstone in the upper part of the Lower Permian

Shows of oil have been encountered in the Tanmurra formation and the lower part of the Lower Permian (see Kulshill 1 and Lacrosse 1)

A major blowout of dry gas occurred from the upper part of the Permian in the Petrel 1 well where the gas flowed [or more than 18 months until the well was eventually killed

Nearly all Permian and Carboniferous sediments found in the wells as yet drilled in the Bonaparte Gulf area were deposited in paralic to shallow marine environment Shale and siltstone are associated or inter-bedded with sandstone and may act as efficient cap rocks Formations within this sequence have shown good characteristics of a source rock either for gas or for oil

2 Structures

A number of structures more or less related to salt tectonism are present in the NTP17 They are expected to have trapped hydrocarbons in either the Lower Permian or the Lower Carboniferous Isopach analysis of Lower Permian intervals suggests an early structuration for the main potential reservoirs

Four well-defined structures are listed hereunder with their maincharacteristics

B C D E

Distance to the coast 45 24 24 31 (miles)

Water depth (feet) 115 66 92 73

Depth of the main objectives (feet)

6000 1800 2200 1960 10000 (5800) (6200) (5960) (12-14000) (12-14000) ~

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

FIGoJ

J lt NTP17I10deg 0 0 15l 0 h QlZ s0 0 () 0 0

I -(I)

l- IX0 0 ( 0 II 0 NT aI onN l 0 2 N 1 OLD lt z e J ( 0 -- Jl 5 - t

i lI _ 0 (I)SA I 0 c

Iii Cgt~

~ 0 11deg00 00 11deg 0000 0

129 0 00 00 129 0 28 00 10 11 0

130deg30

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OFfop I E S E LshyI- 3 0

12deg 30OO~ 12deg 3000 t 11 11 12go50 00 129deg5500

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C) N

130-~i------- aI

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TERRITORY -Q) I shy

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a w CJ LtJ -J Z c0 ltI ltir

WESTERN AUSTRALIA ltIw 5 J 0 ltI13OllO

r- T I

6

B C D E

Vertical closure (feet) at Horizon 5 640 490 986 ii20

850

Closed area (sqml ) at 20 4 17 4

20

Volume of closed rock (acre foot) at - 4110000 778000 5350000 535000

5350000 to 940000

(5800) estimate based on geological information

Fossil Head sandstone or equivalent underlying seismic horizon 5

Sugarloaf or greywacke sandstone of the Kulshill formation overlying seismic horizon 7

bull Tanmurra sandstone or equivalent underlying seismic horizon 8

several other structures of smaller size were recognized but need more detailed seismic work

On all these structures depths to the sea bottom never exceed 1120feet

3 Conclusion

In a first stage of an Exploration drilling programme in the NTP17 permit two or three objectives can be tested on at least four well-defined structures (BCDE)

These objectives consist of good reservoirs in either the Permian or the Lower Carboniferous section associated with source rocks on an often above average hydrocarbon potential the most promising objective being as yet the equivalent of the gas-bearing formation at Petrel 1 These objectives can be reached at depths ranging from 6000 to 13000 feet

In addition to its reasonably well-established petroleum potential other significant advantages of the permit are shallow depths to the sea floor over objectives and relatively short distances to the coast For all these reasons the NTP17 permit appears in terms of economic appraisal of noticeably high standard

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[ KULSHILL No1

STRATIGRAPHIC SECTION

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[ KULSHILL No1

STRATIGRAPHIC SECTION

V4r+ical 5cala lem- 500 ampEPT t910

FOR-MATtONCAS JNc S SEC-TION LITHOLOGY[ coRE~ _it AuE

[ I~ 1908~~ 8ICKk~ wi) minor ndt-onc liftC shy

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1 ~ ~

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1- FIG 4middot2 AUSTIUU~ AQUITAINE PpoundTCK)lpoundUM

[ KULSHILL No1

STRATIGRAPHIC SECTION

V4r+ical 5cala lem- 500 ampEPT t910

FOR-MATtONCAS JNc S SEC-TION LITHOLOGY[ coRE~ _it AuE

[ I~ 1908~~ 8ICKk~ wi) minor ndt-onc liftC shy

Z~ to 41) ~inc

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1 ~ ~

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- --- VI

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Jshy

- -

FlG4-3 AUSTRALIAN AQUITAINE PETROLBJM

LACROSSE No STRATIGRAPHlC SECTION

4rHcal Scal(Z I un = 500 JAN 911

FOlrMATIONfCA61NGS 5ecTION LITHOLOGYoN CO~ES amp- AGE

0shyTERTlARY QuARTE2N T2A~~iG

hltlIc ~cY 1 -slaquond +onc li~ht 9r1 ~7ampd -S~ fine Qranu limcutonc whic-ydlow cO

1185 -libO Sandi+onlaquo I whif4 fin4- r(lio(Zd ~ ~ Coer I lan~~ amp

11 -IQQO Si Ihtoot ~1qhH 1 ih41lc I lim(~~ r

qqo-uw

2410 _~80

~H I

1~ f-- - ~80-4000 Sandstonlaquo +ine- qralnLd zt-~-7~~ Si It~fon(Z I blOlck pyrifi c- shy

4~ Coaf and Ijmt-~+on shy4000 -411NT

7UV Sand stone mcdium-ar~cent grOlin4td ~i t~+oncent grey

_

00000I Sand ~--oo(Z light grey ) ~ina- fo J vt-ry coartcz grain(td) pyritic J ct shy_ - o cO II 1 st~+oo aod ~halltt

UJ ~ )f7- ~ liu J

- J J 0 J

7SW-8S10 ---------------l) ~ ~

S(JLOd~+on(L) light 9r~y tint- +0 - 0

J Coar~laquo ~ ~ i Cf I)lima~+one and Dolomrra co

-

I

----

-- - ---

L Fig4middot4lUSTRALlAH AQUITAINE PErIlOLpound~M

PETREL No1 STQATIGRAPHIC SECTlONLat 110 0 4 1r

Looq ItsmiddotU 1 Z-If ~ Spuddczd 15 - s - ~~ Vt+ical Sca Ie Iem ~ 500

II Ci - - S - ~ FORMATON

CAS I NGamp SECTION LITHOLOGY ~ AGE

o

~ lJ I 1--w w -lo ~O-1010 )4nolll v 11m 0 04 h1l PAlpoundOlEN Ew I

rOlo -1182 Sandston4- mlLdlum eoltxrS4 ~cC ~90-

~ ~ lau con I+ ie ux 1cafampOu S ex nd J ccrnd4+onG_ cxlqi IICluo-~ Dec 0

--------+=~ Z~ E_1182 -4~ ~ ~ u~ shyShal4- lar(J~nj+i- jcaC4()(J~ ~ ~jl+ w+h thin tr+ci(b4td~ of o ~ uJ-a Q

limcz~+on4 u -Ii laquo d OIfJL I ~ V a ~~ 0o E f-ll d) ct

d ~- J uJ ~ cO ~ ~

Q

t1brO J Lt

~ D-4 ~ cO

t---- - - - ------------ - --------f-------j l~I~- - tno sectcO z v-=-- ~ ~ Shol wi~b intublaquoh 0+ IIm4Jon4 l- shyo =-== J)) -0 I) -

~ -=-shy= ~ sClnch+onc ~ if=- ~----- ----------___+-___1~ ------ ~ ltdmiddot lI middot 70- 4 I ~8

--7-- ~ Ci 0 0D Sarod ~+o4 ioq to coaf~(l wi cJ gt w

coa I jn~qrbzd ~ ~ 0 J 2

o D u 1 l( ~

---- - -shy

7314- SI08 1 ShCJ Ic ~ (4) -qruo (l( no ruJmiddot brown wifh sands+one ) fill to coar ~ --_ (QeI I~h__ _

810S - O~O - ~9 Sand~+ooc li +0 41 coa(l

o

94-71 - ~[]

l ~ i H~fo Q nct oand~4-on4- vu-y flnc r- shy~n al 0 J4 laquor rbonlaquouous 0

~ ~-~---~----------------------~--T__1-- - shy1I~~-~57

Sioda s~i( I im ~t-onG_ With bryo ~oa rz =-- --- 2Qn4~t0n4 vcry +1middot04 0 +in4 tiqhf- ct1 ~1i middot ----~ 4 ltilfc+ona- =--=

__

IT IC ~j 5-7o----__-L-_ _ ____rr-OL-- ~ ________ _ _ ____ _ - - ----- --__-+--__------1_ ----I

1~______________________________s_u_v_O_ir pr_o_~r+__(l_~r ~ ___ __ ____________________________~

----

-- - ---

L Fig4middot4lUSTRALlAH AQUITAINE PErIlOLpound~M

PETREL No1 STQATIGRAPHIC SECTlONLat 110 0 4 1r

Looq ItsmiddotU 1 Z-If ~ Spuddczd 15 - s - ~~ Vt+ical Sca Ie Iem ~ 500

II Ci - - S - ~ FORMATON

CAS I NGamp SECTION LITHOLOGY ~ AGE

o

~ lJ I 1--w w -lo ~O-1010 )4nolll v 11m 0 04 h1l PAlpoundOlEN Ew I

rOlo -1182 Sandston4- mlLdlum eoltxrS4 ~cC ~90-

~ ~ lau con I+ ie ux 1cafampOu S ex nd J ccrnd4+onG_ cxlqi IICluo-~ Dec 0

--------+=~ Z~ E_1182 -4~ ~ ~ u~ shyShal4- lar(J~nj+i- jcaC4()(J~ ~ ~jl+ w+h thin tr+ci(b4td~ of o ~ uJ-a Q

limcz~+on4 u -Ii laquo d OIfJL I ~ V a ~~ 0o E f-ll d) ct

d ~- J uJ ~ cO ~ ~

Q

t1brO J Lt

~ D-4 ~ cO

t---- - - - ------------ - --------f-------j l~I~- - tno sectcO z v-=-- ~ ~ Shol wi~b intublaquoh 0+ IIm4Jon4 l- shyo =-== J)) -0 I) -

~ -=-shy= ~ sClnch+onc ~ if=- ~----- ----------___+-___1~ ------ ~ ltdmiddot lI middot 70- 4 I ~8

--7-- ~ Ci 0 0D Sarod ~+o4 ioq to coaf~(l wi cJ gt w

coa I jn~qrbzd ~ ~ 0 J 2

o D u 1 l( ~

---- - -shy

7314- SI08 1 ShCJ Ic ~ (4) -qruo (l( no ruJmiddot brown wifh sands+one ) fill to coar ~ --_ (QeI I~h__ _

810S - O~O - ~9 Sand~+ooc li +0 41 coa(l

o

94-71 - ~[]

l ~ i H~fo Q nct oand~4-on4- vu-y flnc r- shy~n al 0 J4 laquor rbonlaquouous 0

~ ~-~---~----------------------~--T__1-- - shy1I~~-~57

Sioda s~i( I im ~t-onG_ With bryo ~oa rz =-- --- 2Qn4~t0n4 vcry +1middot04 0 +in4 tiqhf- ct1 ~1i middot ----~ 4 ltilfc+ona- =--=

__

IT IC ~j 5-7o----__-L-_ _ ____rr-OL-- ~ ________ _ _ ____ _ - - ----- --__-+--__------1_ ----I

1~______________________________s_u_v_O_ir pr_o_~r+__(l_~r ~ ___ __ ____________________________~

- -- -

- -

--

AU~ 1KALlAN AUUIIAli~t ~tIKULtUM rfy - llltl FIG _5

I r BOUGAINVILLE

J PREDICTED SECTIONI x 1(9a 02 30

y 13a 4638 VERTICAL SCALE lem 500J Wd 115 NT P 17 SP 208 803

CASiNG ISECTION LITHOLOGY8 CORES 0

f--+--~--h----+- Sea be d~o j 265 1--= I tl 115shy Mudstone SIlty and glouccnilic t= =- ~ n

565 r---oJ20 f--_ - shy

~-- (2 ) ~~~--- ~--~~~~~~~~~~~-~--~~~~~~~--~~~~ r-)

1 Sandstone porous shy - amp

(30)til I- - shy

Shale red and variegoted micoceous _t=--= ~=

(3)1 shy

2 f-- - Sand and sandstone with possible minor

ltj interbedded shale_Jmo

- shy

13f r-_-7- Z o l shye

-- - TRIASS IC~ ===--= n-- Shale dark grey to black _ ---- o --= ==- LL4 - - shy

~i= ==-= -=--=shy

(4) ~~-+----------------~----------~-----------

1Il Limestone bioclostic with Bryozoa _I

o Sandstone and shale _ UPPERj f-- shy

~ - - e PERMIANj Z

5975 6 1---_ I ~ r--~- IJ ~~~---------------------+------------(5)

I Sandstone

7 o e

J

W z I-- -- I

ef--middot shy f- shy

J 1-- - shyShale

f---- - 1 -f-- shyII ()gf--- shy 0 f---- () -

f-- -- 0 w shyt-- - LL

a1---- -shy

1 0 f=--= -

Sandstonebull I (

IL J S

II f---l (7) lJ J~ ~i ~ ~ r=-----shy

0 ~- I~~ c--c-=--- Greywocoe sandstone with po~ibly same

en w w __ 12 ~~ lillilic shale ~

J 0

J ~ gt- o~-~ ~ W

r--- cr ()I 13--==-shy

=-~------------------------------------------------------~--------------

• Geological framework
• Exploration history