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Brazos A-105 D-Sand Reservoir Modeling by Integration of Seismic Elastic Inversion Results with Geostatistical Techniques

By
W. Xu
W. Xu
Unocal Thailand, Ltd. Bangkok, Thailand
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P. Dooley
P. Dooley
Unocal Thailand, Ltd. Bangkok, Thailand
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K. Wrolstad
K. Wrolstad
Unocal Exploration and Production Technology Sugar Land, Texas, U.S.A.
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K. Domingue
K. Domingue
Nexen Petroleum U.S.A. Inc. Dallas, Texas, U.S.A.
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D. Kramer
D. Kramer
International Reservoir Technologies, Inc. Lakewood, Colorado, U.S.A.
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D. T. Vo
D. T. Vo
Unocal Thailand, Ltd. Bangkok, Thailand
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Published:
January 01, 2006

Abstract

An integrated reservoir modeling study of the Bigenerina humblei (Big Hum) Miocene D-sand at Brazos A-105 field, offshore Texas, was conducted to predict the lateral extent of the reservoir, to build a porosity model for use in flow simulation and reserve evaluation, and to assess the uncertainty of the reserve estimation. Several geostatistical techniques for integrating well-log porosity with quantitative average porosity derived from a forward elastic model-based inversion method for three-dimensional seismic data were applied in this reservoir modeling study. Elastic modeling was necessary to predict the correct porosity-amplitude relationship for this reservoir because it is a class 2 type amplitude-vs.-offset reflection. The results of the study showed that if a reservoir is seismically resolved and properly imaged, elastic model-based inversion of the type employed can be used in conjunction with geostatistical methods to obtain a more complete reservoir description. These techniques were determined to have direct application to reservoir-flow modeling and hydrocarbon reserve volume estimation.

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Contents

AAPG Computer Applications in Geology

Stochastic Modeling and Geostatistics: Principles, Methods, and Case Studies, Volume II

T. C. Coburn
T. C. Coburn
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J. M. Yarus
J. M. Yarus
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R. L. Chambers
R. L. Chambers
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American Association of Petroleum Geologists
Volume
5
ISBN electronic:
9781629810362
Publication date:
January 01, 2006

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