Three‐dimensional seismic image of a geothermal reservoir: The Geysers, California

Three‐dimensional seismic image of a geothermal reservoir: The Geysers, California Three‐dimensional seismic travel‐time tomography of The Geysers geothermal area, in the coast ranges of northern California, shows a strong (−9%) anomaly in VP/VS, the ratio of the compressional and shear wave speeds, that is not evident in VP alone and corresponds closely to the most intensively exploited part of the geothermal reservoir. This anomaly probably indicates low pore pressure and relatively dry conditions, caused partly by boiling of pore water as steam is extracted. Steam pressure decreases over the last decade have probably caused seismologically measurable changes in wave speeds. Tomographic measurement of VP/VS is a promising technique both for identifying geothermal resources and for monitoring them during exploitation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Three‐dimensional seismic image of a geothermal reservoir: The Geysers, California

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Publisher
Wiley
Copyright
© 1996 by the Chinese Geophysical Society
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/95GL03321
Publisher site
See Article on Publisher Site

Abstract

Three‐dimensional seismic travel‐time tomography of The Geysers geothermal area, in the coast ranges of northern California, shows a strong (−9%) anomaly in VP/VS, the ratio of the compressional and shear wave speeds, that is not evident in VP alone and corresponds closely to the most intensively exploited part of the geothermal reservoir. This anomaly probably indicates low pore pressure and relatively dry conditions, caused partly by boiling of pore water as steam is extracted. Steam pressure decreases over the last decade have probably caused seismologically measurable changes in wave speeds. Tomographic measurement of VP/VS is a promising technique both for identifying geothermal resources and for monitoring them during exploitation.

Journal

Geophysical Research LettersWiley

Published: Mar 15, 1996

References

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