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Testing Hydrocarbon Saturation Models For Use in Original Oil-in-Place Estimation: South Dome of Oregon Basin Field, Park County, Wyoming

By
Michael J. Heymans
Michael J. Heymans
Marathon Oil Company Littleton, Colorado, U.S.A.
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Douglas A. Steed
Douglas A. Steed
Marathon Oil Company Houston, Texas, U.S.A.
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David E. Hamilton
David E. Hamilton
Landmark/Zycor Inc. Austin, Texas, U.S.A.
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Barbara A. Pavlov
Barbara A. Pavlov
Landmark/Zycor Inc. Austin, Texas, U.S.A.
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Published:
January 01, 1992

Abstract

A computer mapping technique for improving the accuracy of original oil-in-place estimates for the Tensleep and Phosphoria formations in South Dome of Oregon basin field, Park County, Wyoming, is presented. Grids representing top and base structure, average porosity, net-to-gross ratio, and integrated average oil saturation from capillary pressure curves, are combined to create a grid of hydrocarbon pore thickness for each reservoir.

The average-oil-saturation model is created by correlating capillary pressure curves to mapped porosity. This model incorporates more information about the three-dimensional distribution of reservoir fluids than was used in methods applied previously. Because of this, it provides a more accurate representation of the fluids' areal distributions. Volumes resulting from use of this technique are compared with methods that use alternative average oil saturation modeling approaches: (1) a constant oil saturation, (2) a grid derived from average-oil-saturation at each well, (3) an average oil saturation grid from a single capillary pressure curve, and (4) a dry-oil production contact used in place of the free-energy surface. Maps show the steps in the process and allow comparison of the effects of the five oil saturation modeling methods.

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Contents

Computer Applications

Computer Modeling of Geologic Surfaces and Volumes

David E. Hamilton
David E. Hamilton
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Thomas A. Jones
Thomas A. Jones
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American Association of Petroleum Geologists
Volume
1
ISBN electronic:
9781629811055
Publication date:
January 01, 1992

GeoRef

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