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

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Description

We have collected and analyzed fracture and fluid flow data from wells both within and outside the producing geothermal reservoir at Dixie Valley. Data from wellbore imaging and flow tests in wells outside the producing field that are not sufficiently hydraulically connected to the reservoir to be of commercial value provide both the necessary control group of fracture populations and an opportunity to test the concepts proposed in this study on a regional, whole-reservoir scale. Results of our analysis indicate that fracture zones with high measured permeabilities within the producing segment of the fault are parallel to the local trend ... continued below

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13 p.

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Zoback, M. D. March 8, 1999.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 11 times . More information about this report can be viewed below.

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Description

We have collected and analyzed fracture and fluid flow data from wells both within and outside the producing geothermal reservoir at Dixie Valley. Data from wellbore imaging and flow tests in wells outside the producing field that are not sufficiently hydraulically connected to the reservoir to be of commercial value provide both the necessary control group of fracture populations and an opportunity to test the concepts proposed in this study on a regional, whole-reservoir scale. Results of our analysis indicate that fracture zones with high measured permeabilities within the producing segment of the fault are parallel to the local trend of the Stillwater fault and are optimally oriented and critically stressed for frictional failure in the overall east-southeast extensional stress regime measured at the site. In contrast, in the non-producing (i.e., relatively impermeable:) well 66-21 the higher ratio of S{sub hmin} to S{sub v} acts to decrease the shear stress available to drive fault slip. Thus, although many of the fractures at this site (like the Stillwater fault itself) are optimally oriented for normal faulting they are not critically stressed for frictional failure. Although some of the fractures observed in the non-producing well 45-14 are critically stressed for frictional failure, the Stillwater fault zone itself is frictionally stable. Thus, the high horizontal differential stress (i.e., S{sub Hmax}-S{sub hmin}) together with the severe misorientation of the Stillwater fault zone for normal faulting at this location appear to dominate the overall potential for fluid flow.

Physical Description

13 p.

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OSTI as DE00012560

Medium: P; Size: 13 pages

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  • Other Information: PBD: 8 Mar 1999

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  • Report No.: DOE/ID/13452
  • Grant Number: FG07-96ID13452
  • DOI: 10.2172/12560 | External Link
  • Office of Scientific & Technical Information Report Number: 12560
  • Archival Resource Key: ark:/67531/metadc625122

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  • March 8, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 1:14 p.m.

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Zoback, M. D. Fracture Permeability and in Situ Stress in the Dixie Valley, Nevada, Geothermal Reservoir, report, March 8, 1999; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc625122/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.