AASG Geothermal Data Repository
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Hawaiian Department of Natural Resources
Hawaii Geothermal Document Metadata Compilation Part 2
Downloadable PDF: A Geochemical Case History of the HGP-A Well, 1976-1982
USGIN ISO 19139
A Geochemical Case History of the HGP-A Well, 1976-1982
Thomas, Donald M.
The Hawaii Geothermal Project Well-A, located on the Island of Hawaii, was completed in 1976 to a depth of 1966 meters. The bottomhole temperature, under shut-in conditions, is 360 C and at full discharge is capable of producing about 45,500 kg/hr of a mixed fluid composed of 48 percent steam and 52 percent liquid. The major element chemistry of the fluids suggests that recharge to the reservoir is largely fresh meteoric water with no more than 10% to 15% of the recharge being from sea water. Extensive water-rock equilibration has occurred; however neither Na-K-Ca nor silica geothermometry calculations have been able to yield reasonable reservoir temperatures. Isotopic data suggest that the circulation rate and residence times of fluids in the reservoir are on the order of a few thousand years. Helium isotopic data also indicate that the heat source for this reservoir is very young or very large.
Jan 01, 1982
Author Contact Information
Thomas, Donald M.
University of Auckland Geothermal Institute
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Sponsored by the U.S. Department of Energy under award DE-EE0002850 to the Arizona Geological Survey acting on behalf of the Association of American State Geologists.
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Arizona Geological Survey 2012