Actions for Characterization of Fracture Patterns in the Geysers Geothermal Reservoir by Shear-wave Splitting [electronic resource].

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Characterization of Fracture Patterns in the Geysers Geothermal Reservoir by Shear-wave Splitting [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy, 1999.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
14 pages : digital, PDF file
Additional Creators
United States. Department of Energy. Idaho Operations Office, United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The authors have analyzed the splitting of shear waves from microearthquakes recorded by a 16-station three-component seismic network at the Northwest Geysers geothermal field, Geysers, California, to determine the preferred orientation of subsurface fractures and cracks. Average polarization crack directions with standard deviation were computed for each station. Also, graphical fracture characterizations in the form of equal-area projections and rose diagrams were created to depict the results. The main crack orientations within the steam field are predominantly in the N10°E to N50°E direction, consistent with expected fracture directions in a pull-apart basin created by sub-parallel right-lateral strike-slip faults related to the San Andreas fault system. Time delays range from 15--60 ms, similar to the time delays from previous studies at geothermal reservoirs. They have detected a significant increase in time delays between 1988 and 1994, which they attribute to widening of the cracks or filling of the cracks with fluid. Increase in production activities during this time also could have influenced this widening.
Report Numbers
E 1.99:doe/id/13468
doe/id/13468
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
09/15/1999.
"doe/id/13468"
J. A. Rial; D. Erten.
Type of Report and Period Covered Note
Final; 09/16/1996 - 09/15/1999
Funding Information
FG07-96ID13468
View MARC record | catkey: 14383231