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Book Chapter

The Role of Wrench Faults and Fractures in Creating “Sweet Spots” in Tight Gas Exploration and Production at Rulison Field, Colorado

By
Thomas L. Davis
Thomas L. Davis
Colorado School of Mines, 1500 Illinois St., Golden, Colorado, 80401, U.S.A. (e-mails: tdavis@mines.edu, rbenson@mines.edu)
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Robert D. Benson
Robert D. Benson
Colorado School of Mines, 1500 Illinois St., Golden, Colorado, 80401, U.S.A. (e-mails: tdavis@mines.edu, rbenson@mines.edu)
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Published:
January 01, 2013

Abstract

Study of a regional three-dimensional seismic data set by Cumella and Ostby (2003) indicated the potential existence of wrench faults in the southern Piceance Basin, Colorado. Although the faults could be inferred to cut through the productive interval, no direct observation was possible until the Reservoir Characterization Project (RCP) conducted a multicomponent seismic study at Rulison Field. This study confirms the existence of faults and coduments their importance in creating fracture zones critical to higher expected ultimate recovery (EUR) well production within the field. Three-dimensional seismic data were acquired at Rulison Field by RCP to investigate whether zones of high fracture density within the Mesaverde reservoir interval could be detected. Three time-lapse, multicomponent seismic surveys were acquired in 2003, 2004, and 2006. The study confirmed the existence of wrench faults, documented zones of high fracture density, and observed pressure depletion within these zones. Wrench faults and fracture zones play an important role in the creation of “sweet spots” associated with wells of high EUR. Sweet spot identification with multicomponent seismic data can improve the economics of tight gas exploration and production.

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Contents

AAPG Studies in Geology

Application of Structural Methods to Rocky Mountain Hydrocarbon Exploration and Development

Constance N. Knight
Constance N. Knight
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Jerome J. Cuzella
Jerome J. Cuzella
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Leland D. Cress
Leland D. Cress
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American Association of Petroleum Geologists
Volume
65
ISBN electronic:
9781629812632
Publication date:
January 01, 2013

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