Heat Flow Regime in The Geysers-Clear Lake Area of Northern California, U.S.A.
- Key words
- Exploration; USA; California; Lake; The Geysers; Temperature Gradient; Heat Flow; Thermal Conductivity; Gravity; Fractures; Greywache; Serpentine
- Location
- Clear Lake Volcanic Field, California; The Geysers, California
- Conference
- Geothermal Resources Council Transactions
- Year
- 1989
- Session
- Exploration; Temperature gradients; Heat flow; Thermal condu
- Language
- English
Abstract
From 1971 through 1984, about 620 thermal gradient/heat flow boreholes were drilled din the Geysers Clear Lake Area of Northern California. The data from approximately 85 percent of these boreholes are now available in the public domain for interpretation to define the limits and magnitude of the thermal anomaly. Sixty seven heat flow boreholes with lithology, thermal gradients and thermal conductivities provide constraints on the quality of the data and therefore on the extent of the Geysers Clear Lake thermal anomaly. An anomalous thermal area of about 750 square kilometers where heat flow values exceed 168 mW m-2 (4HFU) surround the presently producing Geysers Steam Field which has an areal extent of about 75 square kilometers with heat flow values greater than 335 mW m-2 (8 HFU).
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