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Reservoir Delineation and Performance: Application of Sequence Stratigraphy and Integration of Petrophysics and Engineering Data, Aneth Field, Southeast Utah, U.S.A.

By
L. James Weber
L. James Weber
1Mobil Exploration and Producing Technical Center, P. O. Box 650232, Dallas, Texas 75265-0232
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Frank M. Wright
Frank M. Wright
2Mobil Exploration and Producing Technical Center, P. O. Box 819047, Farmers Branch, Texas 75381-9047
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J. F. (Rick) Sarg
J. F. (Rick) Sarg
1Mobil Exploration and Producing Technical Center, P. O. Box 650232, Dallas, Texas 75265-0232
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Ed Shaw
Ed Shaw
2Mobil Exploration and Producing Technical Center, P. O. Box 819047, Farmers Branch, Texas 75381-9047
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Leslie P. Harman
Leslie P. Harman
3Mobil Exploration and Producing U.S., Inc., P. O. Box 633, Midland, Texas 79702
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Jim B. Vanderhill
Jim B. Vanderhill
3Mobil Exploration and Producing U.S., Inc., P. O. Box 633, Midland, Texas 79702
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Don A. Best
Don A. Best
2Mobil Exploration and Producing Technical Center, P. O. Box 819047, Farmers Branch, Texas 75381-9047
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Published:
January 01, 1995

ABSTRACT

Rock petrophysical data and production/performance (i.e., engineering) data from the McElmo Creek Unit of the Giant Aneth Field, southeastern Utah, were integrated into a reservoir architecture or stratigraphic layer model that is based on high-resolution sequence stratigraphy. The layer model describes the architecture of high-frequency depositional cyclicity. Nineteen layers (i.e., parasequences or depositional cycles) are described within the Middle Pennsylvanian Desert Creek and lower Ismay section at McElmo Creek. Time-slice mapping of these synchronous layers, and of the facies contained within the layers, provides the basis for predicting the distribution and continuity of reservoirs. Geologic maps and cross sections were constructed to illustrate facies distribution and predict reservoir quality and continuity. Facies and layering data, coupled with core analysis data and engineering performance analysis, contribute to the understanding of fluid pathways. Several examples are selected that relate reservoir performance to changes in facies.

At the field scale, porous and permeable facies stack to form a thick and areally extensive reservoir. Reservoir performance is related to the position of shallow-water facies along a platform-to-basin transect. High-resolution sequence stratigraphy provides architectural detail that permits mapping of successive stages of platform development. Field performance is improved in areas where injection and production wells are completed in platform algal buildup facies.

Facies heterogeneity and reservoir eompartmentalization occur within a synchronous, genetically related cycle of deposition. Production/performance anomalies are observed at the interwell scale in laterally discrete reservoirs. Geologic maps show the distribution of facies and are used to predict the occurrence of reservoir quality rock. Engineering maps are compared with geologic maps to identify wells or areas of the field that require remedial action.

Areas of improved reservoir performance are tied to diagenetic processes that crosscut depositional fabric. Basinally restricted fluids are interpreted to have flowed through porous and permeable rock along localized areas of the northern or windward margin of the carbonate platform, causing pervasive dolomitization. Cumulative oil production in these areas is much higher than for other areas of the field.

A reservoir characterization study of the McElmo Creek Unit was conducted by technologists with Mobil Exploration and Producing U.S., Inc. A synergistic approach led to an improved geologic model, but, more importantly, aspects of this study have been used to increase reserves, increase production, and decrease production costs on a $/barrel basis.

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Contents

SEPM Short Course Notes

Hydrocarbon Reservoir Characterization: Geologic Framework and Flow Unit Modeling

Emily L. Stoudt
Emily L. Stoudt
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Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
34
ISBN electronic:
9781565761032
Publication date:
January 01, 1995

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