A model for the shallow thermal regime at Dixie Valley geothermal field

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Conference Paper: A model for the shallow thermal regime at Dixie Valley geothermal field

Abstract
Pressure drawdown of the Dixie Valley reservoir supplying Oxbow's power station has caused an increase in steam-heated thermal activity around the Senator fumarole, and subsidence centered near the toe of the fan immediately east of the fumarole. Analysis of shallow well data in the area shows that a 1 km2 are of the fan is now dominated by steam below about 1000 m asl, or 50 m below the elevation of the adjacent valley floor. Two wells within this shallow, high temperature anomaly have temperature maxima at 1035 m asl, suggestive of an outflow zone at about this elevation. Although this zone is now steam filled, our model suggests that this was the original liquid outflow of this part of the geothermal field. It has a temperature of at least 165°C. The inferred pressure profile prior to development implies lateral outflow from the Stillwater fault zone into the fan above about 800 m asl. Drawdown of the reservoir liquid has drained the outflow zone and caused two phase conditions. Where relatively competent material beneath the fan merges with weak playa sediments, the pressure decline has caused subsidence. Heat loss considerations suggest that the original liquid mass flow into the outflow zone was 5 kg/s (factor of two uncertainty).

Authors 
R. G. Allis, Stuart D. Johnson, Gregory D. Nash and Dick Benoit






Conference 
GRC Annual Meeting; Reno, Nevada; 1999/10/17


Published 
Geothermal Resources Council, 1999





DOI 
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Online 
Internet link for A model for the shallow thermal regime at Dixie Valley geothermal field

Citation

R. G. Allis, Stuart D. Johnson, Gregory D. Nash, Dick Benoit. 1999. A model for the shallow thermal regime at Dixie Valley geothermal field. In: GRC Transactions. GRC Annual Meeting; 1999/10/17; Reno, Nevada. Davis, California: Geothermal Resources Council; p. 493-498


Related Geothermal Exploration Activities
Activities (1)


Areas (1)
  1. Dixie Valley Geothermal Area
Regions (0)