Seismic Reflection Investigations in a Geothermal Area

Abstract

6.5 miles of 12 fold seismic reflection coverage using Vibroseis technique were acquired in the southern part of the Geysers steam field in California to examine the applicability of active seismic techniques in geothermal exploration. The results have been most encouraging in that enhanced reflections have been observed across lithologic boundaries and fracture zones, believed to be the zones in which steam is extracted in the Geysers area. From the seismic reflection data there is a suggestions that several deep horizons, possessing amplitude anomalies, may represent fracturing along the main thrust fault zones at depth forming a main avenue of steam transport.