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Scientific Investigations Report 2008–5225

Gas, Oil, and Water Production in the Wind River Basin, Wyoming

By Philip H. Nelson, Patrick K. Trainor, and Thomas M. Finn

Abstract

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Gas, oil, and water production data were collected from the Fuller Reservoir, Cooper Reservoir, Frenchie Draw, Cave Gulch, and Madden fields in the Wind River Basin, Wyoming. These fields produce from the Mississippian Madison Limestone, the Upper Cretaceous Cody Shale and Mesaverde Formation, and the Paleocene lower unnamed member and Shotgun Member of the Fort Union Formation.

Diagrams of water and gas production from tight gas accumulations in three formations in the Madden field show that (1) water production either increased or decreased with time in all three formations, (2) increases and decreases in water production were greater in the Cody Shale than in either the Mesaverde Formation or the lower unnamed member of the Fort Union Formation, (3) the gas production rate declined more slowly in the lower part of the Fort Union Formation than in the Cody Shale or the Mesaverde Formation, (4) changes in gas and water production were not related to their initial production rates, and (5) there appears to be no relation between well location and the magnitudes or trends of gas and water production.

To explain the apparent independence of gas and water production in the Cody Shale and Mesaverde Formation, a two-step scenario is proposed: gas was generated and emplaced under the compressive stress regime resulting from Laramide tectonism; then, fractures formed during a subsequent period of stress relaxation and extension. Gas is produced from the pore and fracture system near the wellbore, whereas water is produced from a larger scale system of extension fractures. The distribution of gas and water in the lower Fort Union resulted from a similar scenario, but continued generation of gas during post-Laramide extension may have allowed its more widespread distribution.

First posted June 30, 2009

For additional information contact:

Team Chief Scientist, USGS Central Energy Resources
Box 25046, Mail Stop 939
Denver, CO 80225

http://energy.cr.usgs.gov/

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Suggested citation:

Nelson, P.H., Trainor, P.K., and Finn, T.M., 2009, Gas, oil, and water production in the Wind River Basin, Wyoming: U.S. Geological Survey Scientific Investigations Report 2008–5225, 24 p.

 



Contents

Abstract

Introduction

Procedure

Fields Evaluated

Fuller Reservoir Field

Cooper Reservoir Field

Frenchie Draw Field

Cave Gulch Field

Madden Field

Cody Shale

Mesaverde Formation

Lower Fort Union Formation

Madison Limestone

Madden Field—Influences on Gas and Water Production

Laramide Compressional Deformation and Gas Generation

Tectonic Extension

Regional Uplift and Erosion

A Speculative Model

Interfield Comparisons of Fluid Production

Summary and Conclusions

Acknowledgments

References Cited

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