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Book Chapter

An Integrated Engineering-Geoscience Approach Leads to Increased Resource Capture from Carbonate Reservoirs

By
Jiajie (Jeff) Chen
Jiajie (Jeff) Chen
Marathon Oil Corporation P.O. Box 3128 Houston, Texas 77253
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Hung-Lung Chen
Hung-Lung Chen
Marathon Oil Corporation P.O. Box 3128 Houston, Texas 77253
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Pauline Chung
Pauline Chung
Burlington Resources 2100 Bow Valley Square IV 250-6th Avenue S.W. Calgary, Alberta T2P 3H7 Canada
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Published:
December 01, 2006

Abstract

Pre-mature water breakthrough can be a common problem for carbonate reservoirs. The field concerned here has producing intervals from the Late Triassic Baldonnel Formation, dominantly by porous dolostone and limestone. Water was produced from some wells, raising a question whether this implied the end of field-life or was attributed to fractures or local high permeability streaks. A multidiscipline study involving geological, petrophysical, petrographical, geophysical, reservoir-engineering analysis, and field management provided an integrated solution to the problem. Structural grids based on 2D seismic mapping were tied with well picks. Detailed core and thin-section analyses allowed us to identify petrophysical facies and rock types, which were then linked to a sequence stratigraphic framework. A geocellular model was constructed to delineate 3D variation of petrophysical properties. It was difficult to quantify the original gas-water contact (GWC) using log data alone due to the presence of bitumen in the non-reservoir zones. Therefore, pressure data were analyzed to derive P/Z plots and obtain original reserves in place. The result of P/Z analysis agrees with the geological model, suggesting that the original GWC was at 775 meters subsea. By modeling the remaining reserve based on step-wise variations of current GWC and comparing the result of decline curve analysis, the current GWC was identified at between 758 and 762 meters subsea, giving a remaining reserve of 89 BCF (70% recoverable). This study resulted in a higher degree of confidence in resource capture, leading to a better strategy for field management and development.

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Contents

GCSSEPM

Reservoir Characterization: Integrating Technology and Business Practices

Roger M. Slatt
Roger M. Slatt
Houston, Texas
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Norman c. Rosen
Norman c. Rosen
Houston, Texas
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Michael Bowman
Michael Bowman
Houston, Texas
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John Castagna
John Castagna
Houston, Texas
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Timothy Good
Timothy Good
Houston, Texas
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Robert Loucks
Robert Loucks
Houston, Texas
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Rebecca Latimer
Rebecca Latimer
Houston, Texas
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Mark Scheihing
Mark Scheihing
Houston, Texas
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Hu Smith
Hu Smith
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
26
ISBN electronic:
978-0-9836096-4-3
Publication date:
December 01, 2006

GeoRef

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