A model of the subsurface structure at the Rye Patch geothermal reservoir based on surface-to-borehole seismic data

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Journal Article: A model of the subsurface structure at the Rye Patch geothermal reservoir based on surface-to-borehole seismic data

Abstract
In 1998, a three dimensional surface seismic survey was conducted to explore the structure of the Rye Patch geothermal reservoir (Nevada) to determine if modern seismic techniques could be successfully applied in geothermal environments. Furthermore, it was intended to map the structural features which may control geothermal fluid production. The results suggested the presence of at least one dominant fault responsible for the migration of fluids in the reservoir. In addition to the surface receivers, a three component seismometer was deployed in a borehole at a depth of 3900 ft, within the basement below the reservoir, which recorded the waves generated by all surface sources. The purpose of the study, was to use the collected data set to determine the subsurface structure as a function of azimuth. A total of 2005 first arrival travel times were determined out of 2134 possible traces, 2 D ray tracing was performed to simulate wave propagation from the surface sources to the receiver at depth. The ray tracing was based on a 2 D laterally homogenous velocity model derived from a velocity profile calculated from a previous vertical seismic profile (VSP) recorded in the same well. It was assumed that differences in travel time between the observed and modeled data are caused by structural deviations form a homogeneously layered model as determined by the VSP, and thus were mapped into topographic changes at depth. The results suggest an east west trending structure (possibly a horst) with boundaries that match the location of faults found based on the analysis of the 3 D seismic surface data.

Authors 
R. Gritto, T.M. Daley and E.L. Majer








Published Journal 
Geothermal Resources Council Transactions, 2001





DOI 
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Online 
Internet link for A model of the subsurface structure at the Rye Patch geothermal reservoir based on surface-to-borehole seismic data

Citation

R. Gritto, T.M. Daley, E.L. Majer. 2001. A model of the subsurface structure at the Rye Patch geothermal reservoir based on surface-to-borehole seismic data. Geothermal Resources Council Transactions. 25:405-409.