Geothermal fields

C. Stone, ed.. Monograph on The Geyser s Geothermal Field, Geothermal Resources Council, Davis, Calif., 1992. 

The flashed steam method is less efficient and its requirements for steam properties—cleanliness, high temperature, and high pressure— are usually unavailable in most geothermal fields. The situation is different with the binary cycle system, which is quite efficient and widely used. This wet system involves the transfer of heat from the hot well stream into a more manageable boiling fluid to generate power through a turboexpander. 

Cavaretta, G., Gianelli, G. and Puxeddu, M. (1980) Hydrothermal metamorphism in the Larderello geothermal field. Geothermics, 9, 297-314. 

McDowell, D. and McCurry, M. (1978) Mineralogical variations in borehole Elmore No. 1, Salton Sea geothermal field, California. Geol. Soc. Am. Abst. Programs, 3, 452. 

Akaku, K. (1988) Geochemistry of mineral deposition from geothermal waters Deposition processes of common minerals found in various geothermal fields and case study in the Fushime field. Chinetsu, 25, 44-61 (in Japanese). 

Browne, P.R.L. (1978) Hydrothermal alteration in active geothermal field. Annu. Rev. Earth Planet. Sci., 6, 229-250. 

Ewers, G.R. and Keayse, R.R. (1977) Volatile and precious metal zoning in the Broadlands geothermal field. New Zealand. Econ. Geol., 72, 1337-1354. 

Aizu geothermal field, with genetic relation to the epithermal gold deposits. Mining Geology, 38, 291-301 (in Japanese). 

McDowell, S.D. and Elders, W.A. (1980) Authigenic layer silicate minerals in borehole Elmore 1. Salton Sea geothermal field, California, U.S.A. Contr. Mineral. Petrol., 74, 293-310. 

Nitta, T., Adachi, M., Takahashi, M., Inoue, K. and Abe, Y. (1991) Heavy metal precipitation from geothermal fluid of 87N-15T production well in the Okuaizu geothermal field, Tohoku District, Japan. Mining Geology, 41, 231-242 (in Japanese). 

Sato, K. (1988) Mori geothermal power plant. In Geothermal Fields and Geothermal Power Plants in Japan. Int. Syrap. Geothermal Energy, Kumamoto and Beppu, Japan, November 10-14 pp. 21-25. 

Yagi, M. (1990) Hydrothermal alteration of the Fushime geothermal field, Kyushu, Japan — Distribution of potassium and rubidium. Research Reports, Japex Research Center, 6, 74-103 (in Japanese). 

Yagi, M. and Kai, K. (1990) Hydrothermal alteration in the Fushime geothermal field Kyushu, Japan. Twelfth N. 2. Geothermal Workshop, University of Auckland, 31-33. 

In most production reservoirs, the produced brines are injected into the formation for purposes of maintaining reservoir pressure and avoiding subsidence and environmental pollution. In the case of geothermal fields, the brines are also injected to recharge the formation. However, the injected brines can adversely affect the fluids produced from the reservoir. For example, in geothermal fields, the injected brine can lower the temperature of the produced fluids by mixing with the hotter formation fluids. 

Zukin JG, Hammond DE, Kn TL, Elders WA (1987) Uraniirm-thoriitm series radionuclides in brines and reservoir rocks from two deep geothermal boreholes in the Salton Sea Geothermal Field, sontheastem California. Geochim Cosmochim Acta 51 2719-2731... 

Carbonate-rich rock formations can be observed in most Japanese geothermal fields. In the Sumikawa field, Akita, Japan, for example, C02-rich ground waters are thought to have reacted with reservoir rocks according to reaction (1), to form a carbonate and kaolinite alteration assemblage. An isotopic investigation of... 

This research is partly supported by the grants of the Programmed Research Development of evaluation technology for the C02 in the exhaust gas sequestration into geothermal fields" of RITE under the fund from METI (Ministry of Economy, Trade and Industry). We thank Odashima, Tokumaru and other members at Ogachi for their kind help during laboratory and field experiments. 

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