Fracture Permeability and In Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir

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Journal Article: Fracture Permeability and In Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir

Abstract

Borehole televiewer, temperature and flowmeter logs and hydraulic fracturing stress measurements conducted in six wells penetrating a geothermal reservoir associated with the Stillwater fault zone in Dixie Valley, Nevada, were used to investigate the relationship between reservoir permeability and the contemporary in situ stress field. Data from wells drilled into productive and nonproductive segments of the Stillwater fault zone indicate that permeability in all wells is dominated by a relatively small number of fractures striking parallel to the local trend of the fault. However, Coulomb failure analysis using these fracture orientations in conJunction with stress orientations and magnitudes suggests that reservoir permeability is high only when individual fractures as well as the overall Stillwater fault zone are optimally oriented and critically stressed for

frictional failure.

Authors 
Stephen Hickman, Colleen Barton, Mark Zoback, Roger Morin, Dick Benoit and John Sass








Published Journal 
U.S. Department of Energy, 1998





DOI 
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Online 
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Citation

Stephen Hickman, Colleen Barton, Mark Zoback, Roger Morin, Dick Benoit, John Sass. 1998. Fracture Permeability and In Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir. U.S. Department of Energy. 3.31-3.38.