Geologic and Geothermal Structure of the Hatchobaru Field, Central Kyushu, Japan
- Key words
- Exploration; Reservoir Engineering; Japan; Hatchobaru; Kyushu Electric; Fault; Fluid Inclusion; Volcanics; Hydrology; Hydrothermal Alteration; Geochemistry; Magnetotelluric; Fracture Flow; Conceptual Models; Otake; Resistivity; Schlumberger Soundings; Wat
- Location
- Otake-Hatchobaru, Japan
- Conference
- Geothermal Resources Council Transactions
- Year
- 1984
- Session
- Exploration; Hydrogeology; Geochemical surveys; Reservoir mo
- Language
- English
Abstract
Recent investigations and explorations in the Hatchobaru geothermal field have confirmed the upflow of thermal fluids along the high angles faults. The fluids seem to be flowing up from the basement in the footwall of the faults which form the main reservoirs in the USA group and the Hohi volcanic rocks. The acid altered zones which extend near the surface act as the cap rock. The main reservoirs are chloride water dominated and are found along the Kamatsuike sub fault and Hatchobaru fault. The temperature is estimated to be 240-270°C on the basis of fluid inclusion thermometry and measured temperatures. Furthermore, there is a large possiblity of finding high temperature reservoirs of 290-300°C in the Basement.
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