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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract

Chapter from:
AAPG Memoir 70: Abnormal Pressures in Hydrocarbon Environments
Edited by B.E. Law, G.F. Ulmishek, and V.I. Slavin
Copyright ©1998 by The American Association of Petroleum Geologists. All rights reserved.
Memoir 70, Chapter 12: Abnormal Pressures Encountered in a Deep Wildcat Well, Southern Piceance Basin, Colorado, by Michael S. Wilson, Kristine Peterson, Bret G. Gunneson, Royale Honore, Matthew M. Laughland, Pages 195 - 214

Chapter 12
Abnormal Pressures Encountered in a Deep Wildcat Well, Southern Piceance Basin, Colorado

Michael S. Wilson
Consultant, Evergreen, Colorado, U.S.A.

Kristine Peterson
Consultant, Lakewood, Colorado, U.S.A. 

Bret G. Gunneson
Legacy Energy Corporation, Denver, Colorado, U.S.A.

Royale Honore
Matthew M. Laughland
Mobil Oil Corporation, Dallas, Texas, U.S.A.

Abstract

A deep wildcat well in the southern Piceance Basin of western Colorado (Mobil O'Connell F11X-34P) encountered three separate and distinct overpressured zones. The shallowest overpressured zone occurs within the Upper Cretaceous Mesaverde Group and coincides with gas-charged, thermally mature coal beds with vitrinite reflectance (Ro) ranging from 0.8 to 2.0%. This overpressured zone is located in the center of the basin where Mesaverde coal beds are thickest and where burial beneath Tertiary sediments is deepest. The overpressured zone is surrounded by subnormally pressured zones, and normally pressured, water-saturated strata occur along the basin margins.

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