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Book Chapter

Beginning with the End in Mind: Exploration-Phase Reservoir Modeling of Multi-Story Channel/Levee Complexes, Deep-Water Nigeria

By
Douglas S. Moore
Douglas S. Moore
ConocoPhillips (UK) LTD Rubislaw House Aberdeen, UK AB15 6FZ
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David T. McGee
David T. McGee
ConocoPhillips 600 N. Dairy Ashford Houston, Texas 77079
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David W. Burge
David W. Burge
ConocoPhillips 600 N. Dairy Ashford Houston, Texas 77079
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Nathan A. Geier
Nathan A. Geier
ConocoPhillips 600 N. Dairy Ashford Houston, Texas 77079
*
Current address Samson Resources Two West Second Street Tulsa, Oklahoma 74103
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Gary Wu
Gary Wu
ConocoPhillips Norge P.O. Box 220 N-4098 Tananger, Norway
*
Current address Samson Resources Two West Second Street Tulsa, Oklahoma 74103
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Published:
December 01, 2006

Abstract

Geoscientists commonly employ high-quality three-dimensional seismic data to reduce deep-water prospect risk. For years, direct hydrocarbon Indicators (DHIs) have addressed hydrocarbon presence, however only more recently have images from three-dimensional datasets been employed to interpret the subsurface reservoir architecture of deep-water sinuous channel systems. Such architectural understanding, particularly in multi-story deep-water channel complexes, is key to predicting well count and spacing, thus ultimately prospect value.

By combining seismic profile channel interpretation, volume interpretation and analog studies, detailed geocellular models were created for offshore Nigeria isolated and stacked multi-story channel complexes. Gross rock volume was defined by interpreting the channel complex top and base horizons that define the reservoir ‘container.’ Seismic facies analysis was applied to amplitude extractions representative of interpreted discrete architectural zones within the reservoir container. In turn, interpreted facies maps were used for conditioning layers within the geocellular model.

Dimensional information for facies objects was recorded from the three-dimensional seismic volume and from both subsurface and outcrop analogs. Individual facies objects were stochastically placed, heavily conditioned to seismic control, having an overall aim of replicating analog end members. The key identified uncertainties of net-to-gross and sand object connectivity were characterized quantitatively and qualitatively through the application of volume sculpting, opacity rendering, and multi-body detection techniques. Geocellular modeling-ranged results were assigned within the flow simulation process to condition well performance, and ultimately, risked pre-drill prospect value was calculated. Subsequent drilling of one of the modeled prospects provided calibration for the assumptions entered into the geocellular models, enhancing the value of the models as predictive tools for analogous leads/prospects.

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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

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