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Distribution of fluids and pressures in the Wind River Basin, Wyoming: Chapter 7 in Petroleum systems and geologic assessment of oil and gas resources in the Wind River Basin Province, Wyoming

Data Series 69-J-7

This report is Chapter 7 in Petroleum systems and geologic assessment of oil and gas resources in the Wind River Basin Province, Wyoming. For more information, see: Data Series 69-J.
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Abstract

To examine the state of hydrocarbons and water in the Wind River Basin of Wyoming, the following data types are compiled and presented at the basin scale: fluid type, pressure, and temperature from drillstem tests; watersalinity and cumulative hydrocarbon production from oil and gas wells; vitrinite reflectance data; and sonic well logs. The spatial distribution of produced fluids shows the nearly ubiquitous presence of mobile water, even in highly productive gas-charged formations. Sonic logs record a basin wide velocity decrease in the Lower Cretaceous Thermopolis Shale through the Upper Cretaceous Cody Shale that is attributed to a combination of paleo-overpressuring and present-day overpressuring. Pressure-elevation plots and mud weights reveal the presence of two large pressure compartments in the Madden area, one above the Waltman Shale Member of the Paleocene Fort Union Formation and the other below it. Temperature data reveal hot and cold spots around structures in the marginal parts of the basin where the Waltman Shale Member of the Fort Union Formation is absent. The highest temperature gradients are in the upper pressure compartment in the Madden area. Vitrinite reflectance data record little change with increasing depth throughout much of the geologic section in shallow parts of the basin and a steady increase of log (Ro ) with depth in the deep parts of the basin. The varied distribution of fluids, pressure, and temperature reflect the complex history of subsidence, thrusting, hydrocarbon generation, water migration, and uplift in and marginal to this large, asymmetric intermontane basin.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Distribution of fluids and pressures in the Wind River Basin, Wyoming: Chapter 7 in Petroleum systems and geologic assessment of oil and gas resources in the Wind River Basin Province, Wyoming
Series title:
Data Series
Series number:
69-J-7
Year Published:
2007
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Wind River Basin Province Assessment Team
Description:
iv, 35 p.
Larger Work Type:
Report
Larger Work Subtype:
USGS Numbered Series
Larger Work Title:
Petroleum systems and geologic assessment of oil and gas resources in the Wind River Basin Province, Wyoming (Data Series 69-J)
Number of Pages:
39
Country:
United States
State:
Wyoming
Other Geospatial:
Wind River Basin Province