Identifying By-Passed Pay and New Reservoirs Using Rock Texture PetrophysicsIntegrated with 3D Geologic Modeling

Offshore Gulf of MexicoNew Wells and Thin Bed Process Update

Presentation Outline

Thin Bed Well Log Analysis

Structure Modeling

Facies Modeling

Petrophysical Modeling

Volumetric Summary

Conclusions and Recommendations

Summary

Objectives

• Previous traditional models underestimated OIP

• Run Thin Bed Process for higher resolution characterization

• Build a 3D geological model and distribute facies and petrophysical properties

• Update Original Oil in Place

• Recommend new drilling opportunities and bypassed pay recompletions

Inputs

• 28 wells, directional surveys, wireline logs

• Well formation tops

• Interpreted structure maps

• Seismic amplitude

• Geologic depositional model

• Well completion and production history

Petrophysical Overview

• Wells were analyzed using the comprehensive modeling process for Thin Bed environments

• All data was incorporated into the 3D reservoir modeling process

Geological Observations

• The depositional system characterized as a fluvial deltaic system with channel and lobe deposits

• Reservoir trapping appears to be primarily structural with possible stratigraphic elements

Thin Bed Analysis

Thin Bed Analysis

• Ability to get high resolution results from conventional data

• Higher resolution answers from old log data

• Important for highly laminated and low contrast intervalsFEATURES

• Better net-to-gross determination

• Better determination of hydrocarbons in place

• Better perm determination

• High resolution analysis

BENEFITS

Input Data Requirements

Minimum requirement

• Resistivity/SP (best results occur when triple combo data is available)

• One high resolution device (i.e. shallow resistivity or some device that indicates laminations)

How Thin Bed Analysis Works

• Utilizes second derivative to determine inflection points along log

• Adjustable for given area, like multi-layer simulator

• Corrects RT, Density, GR and Neutron for thin beds

Thin Bed Output to Textural Based Processing

hydrocarbon

mobilewater

capillaryboundwater

clay boundwater

PHIEPHIT

FFIBVICBW

NMR T2

CLAY BOUND WATER

CAPILLARY BOUND WATER

MEDIUM GRAINED

PORES

COURSE GRAINED

PORES

BIN1 BIN2 BIN3 BIN4

NTV Pore Size

PHIEPHIT

Gulf of Mexico Example

Gulf of Mexico Example - Thin Bed Analysis

14 MMCFPDw/ 1200 bbls condensate

Gulf of Mexico Turbidite

Gulf of Mexico Turbidite – Thin Bed Analysis

6 MMCFPD

15 MMCFPD

Geological Application

3D reservoir modeling with higher resolution property models, improved reservoir characterization and more accurate volumetric calculations

Structure Model

Original Client Data

A-10 A-13

A-10

A-13

Structure Base Map

Mean Sea Level & 6000’ Structure

6000’ Structure Top

Fault Block C

6000’ Structure Top

Fault “T”Fault “R”

Wells and Cross-Section Lines

A

A’

BB’

Well Section A-A’

A A’

A

A’

B B’

Well Section B-B’

B B’

A

A’

B B’

3D Structure Model

Facies and Petrophysical Modeling

Conceptual Model - Fluvial Deltaic System

Delta

Channels

Shale/Non Reservoir

Seismic Amplitude

Facies Model - Fluvial Deltaic System

Coalescing Deltaic Channel BodiesShale/Non ReservoirDelta Lobes

Deltaic Channels

Net to Gross

6000’ Zone 6050’ Zone

Effective Porosity Zone Average

6000’ Zone 6050’ Zone

Permeability Zone Average

6000’ Zone 6050’ Zone

STOIIP Zone Sum (STB/AC) - contact @ 6400’

6000’ Zone 6050’ Zone

Reservoir Modeling Results

Volumetric Summary

Reservoir Volumetric Summary (Oil/Wtr Contact at 6350’)Source: NuView Reservoir Model

Reservoir Bulk (rb) Net (rb) Pore (rb) HCPV (rb) STOIIP (bbl) Assoc. Gas (mcf)

6000 189,729,115 189,729,115 44,872,606 26,176,740 22,183,678 8,429,189

6050 113,871,978 113,871,978 28,211,787 15,220,658 12,898,863 4,901,214

Total 303,601,093 303,601,093 73,084,393 41,397,397 35,082,541 13,330,404

Reservoir Volumetric Summary (Oil/Wtr Contact at 6400’)Source: NuView Reservoir Model

Reservoir Bulk (rb) Net (rb) Pore (rb) HCPV (rb) STOIIP (bbl) Assoc. Gas (mcf)

6000 243,917,923 243,917,923 57,905,811 30,429,705 25,787,886 9,798,690

6050 164,936,450 164,936,450 40,776,820 19,749,456 16,736,828 6,359,536

Total 408,854,374 408,854,374 98,682,631 50,179,161 42,524,714 16,158,225

Main Pass Blk 59 Fault Block C Reservoir Volumetric Summary (Oil/Wtr Contact at 6350’)Source: NuView Reservoir Model

Reservoir Bulk (rb) Net (rb) Pore (rb) HCPV (rb) STOIIP (bbl) Assoc. Gas (mcf)6000 170,827,175 170,827,175 39,956,971 15,594,800 13,215,933 894,401,4916050 101,353,757 101,353,757 26,932,575 13,477,824 11,421,885 772,987,504Total 272,180,932 272,180,932 66,889,546 29,072,624 24,637,817 1,667,388,995

Previous Traditional Log Analysis2006

2014Current Thin Bed Log Analysis

A-15 Pre-Drill and Post-Drill Comparison

Post-Drill NuLook

A15_Loc

Pre-Drill Virtual Well

5600’ SD

5900’ SD

6000’ SD

6050’ SD

New Well A-15 – Upper Sand

IP’d at 1000 BOPD

New Well A-15 – Lower Sand

Has not previously been completed

Has not previously been completed

Well A-15 Standard vs Thin Bed Processing

Standard Processing -140 Net Ft Pay Thin Bed Processing – 187’ Net Pay

A-15 Monthly Production

A-19 Monthly Production

Conclusions and Recommendations

• Previous study recommended two successful wells: A-15 and A-19 that are still producing today.

• Addition of this new well data and refined Thin Bed log processing has resulted in an improved reservoir model.

• Improved model has increased the hydrocarbon volumes to account for the over production of initial estimate.

• The following are recommendations for further field development: 3 new wells and 2 recompletions.

A new well should be planned to test the 5900’ zone and the 6000’ zone at a location just between the A10 and A8 wells. This was proven successful with the new A19 well.

Re-complete the A14 well in the 6000’ zone before leaving the well.

Re-complete the 6050’ zone in the A2 well.

A well should be considered between the A8 and the A14 wells for the 6000’-6050’ zones as the model indicates good properties in that location.

A well should be considered between the A9 and the fault to the West as both the A9 and 8461_2 show overbank deposits leaving room for good quality sand to the West with good amplitude.

The Thin Bed log processing has resulted in a higher resolution model and increased hydrocarbon volume by ~40% addressing the overproduction concern as well as a better understand of the reservoir connectivity and stratigraphic traps created by thin coalescing channel bodies.

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