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Book Chapter

A Sonic Log Study of Abnormally Pressured Zones in the Powder River Basin of Wyoming

By
Debra Maucione
Debra Maucione
University of Wyoming Laramie, Wyoming, U.S.A
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Vladimir Serebryakov
Vladimir Serebryakov
University of Wyoming Laramie, Wyoming, U.S.A
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Paul Valasek
Paul Valasek
University of Wyoming Laramie, Wyoming, U.S.A
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Yue Wang
Yue Wang
University of Wyoming Laramie, Wyoming, U.S.A
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Scott Smithson
Scott Smithson
University of Wyoming Laramie, Wyoming, U.S.A
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Published:
January 01, 1994

Abstract

Most hydrocarbon production from the Powder River basin in northeastern Wyoming is from an abnormally pressured Cretaceous section. The preliminary identification and delineation of abnormally pressured zones by surface seismic methods would greatly enhance hydrocarbon recovery. The present velocity study shows the usefulness of a detailed sonic log analysis to find abnormally pressured zones. Because the conclusion of the log response studypositively indicated the presence of abnormal pressure, surface seismic data will also show these anomalies. Velocity profiles, pressure profiles, and abnormal pressure-gradient calculations all indicate that the Cretaceousshales are overpressured throughout the basin, whereas the Cretaceous sandstones are present in overpressured, underpressured, and normally pressured regimes. Pressure compartment boundaries appear to be stratigraphically controlled. Three profiles in different parts of the basin— T46N, R69-76W (Hilight field area), T51N, R69-77W (Amos Draw-Kitty field area), and T41N, R69-76W (north of the Powell field area)—delineate the top of overpressure near the Parkman Sandstone-Steele Shale contact and the bottom seal along the Fuson Shale.

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Contents

AAPG Memoir

Basin Compartments and Seals

Peter J. Ortoleva
Peter J. Ortoleva
Department of Chemistry Indiana University Bloomington, Indiana
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American Association of Petroleum Geologists
Volume
61
ISBN electronic:
9781629810935
Publication date:
January 01, 1994

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