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Saturation
Water Saturation
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Saturation
Saturation DeterminationObjectives :
Resistivity and Partial Saturation
Archie Saturation Equation
Saturation Exponent n
Bulk Volume Fractions and
Moved Oil Plot MOP
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Saturation
Water Saturation
.
.w
BVW Vol WaterS
Vol Pore= =
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Saturation
Parallel TubesWater
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Saturation
Parallel TubesWater & Oil
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Saturation
Resistivity & Partial Saturation
Parallel Tubes: Hydrocarbon & Water
0
wRR
=
0
wRR
BVW=
w
t
RR
BVW=
w
w
t
RR
S=
Parallel Tubes: Water Bearing
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Saturation
Water Saturation
in resistivity terms, oil appears like glass
both are perfect insulators
water (electrolyte) is the only conductive
material
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Saturation
Resistivity & Partial Saturation
+ Tortuosity
Water
+ Tortuosity
Water & Hydrocarbon
0
w
m
RR
= w
t
w
RR
S
m
=m
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Saturation
Water &Hydrocarbon
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Saturation
Resistivity & Saturation
Parallel Tubes,Water-bearing
Parallel Tubes,
Partially Saturated
Add Tortuosity
0w
R
R =
wt
w
RR
S=
w
t m
w
aRRS
=m
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Saturation
Tortuosity (current path)
water-bearing
mid pore
oil-bearing(water-wet)
grain surface
Sw and exponentsmay differ somewhat
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Saturation
Tortuosity :water vs. oil-bearing
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Saturation
Saturation Exponent n
if oil occupies mid-pore space,(water-wet condition)
tortuosity may change with saturation or
wettability current path may change
n kept independent of m
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Saturation
Determination of Saturation Exponent n
Desaturation Cell measurements on coreplug . . .slope on log-log plot
Capillary Pressure Curves at irreducible
saturation OBM Core . . . recover l iquids in cleaning
Match Archie saturation by adjusting n
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Saturation
Desaturation Cell
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Saturation
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Saturation
Wettability
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Saturation
Effect of
Wettability
on n
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Saturation
Capillary Pressure & Water Level
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Saturation
Capillary
Pressure &
Saturation
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Saturation
Cap. Press. & Reservoir Quality
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Saturation
Dean-Stark
Cleaning
Apparatus
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Saturation
Sensitivityto n
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Saturation
Archie Saturation Equation
0n
w
t
RS
R=
wn
w
t
FRS
R=
w
nw m
t
aR
S R=
1n
wS I=
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Saturation
Nomograph for Archie Equation
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Saturation
Artificial intelligence is no match for
natural stupidity.
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Saturation
Saturation DeterminationSummary :
Water Saturation = vol.water / pore space
= BVW /
n can be determined by desaturation
measurements in a lab,or, by capillary pressure data in the irreducible zone
Archie Saturation Equation for clean reservoirs:
wn
w
t
FRS
R=
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Saturation