Exploration and development of the Takigami geothermal system, Kyushu
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概要
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The Takigami geothermal field is located in the southwestern part of Oita prefecture, Kyushu. Geothermal exploration in this area was initiated in 1979 by Idemitsu Geothermal Co., Ltd. (IGC) and was further developed by Idemitsu Oita Geothermal Co., Ltd. (IOG), which was established in 1993. Various surveys and several well-drillings in the area have been carried out by both IGC and IOG.<BR>The Takigami field has no geothermal manifestations in the surface. It is covered by thick impermeable layer, largely composed of montmorillonite zone, and a thick highly permeable layer emplacing cold groudwater. The montmorillonite zone was formed by hydrothermal alteration and plays the role as the reservoir's cap rock.<BR>The reservoir system is devided into the northeastern and southwestern area based on the distribution of the fluid chemistry, subsurface temperature, and permeability of the layers with the boundary probably correspondent to the Noine fault zone. The reservoir system in the northeastern area has low Cl content (about 450 ppm), relatively low temperature ranging from 160°C to 210°C, and develops in shallow, high permeable zone with a number of fractures in it. On the other hand, the reservoir system in the southwestern area has higher Cl content (about 600 ppm), high temperatutre above 250°C, and develops in deep, low permeablezone. The subsurface geothermal fluid flows from the southwest to the north and northeast of the reservoir.<BR>Numerical simulations suggest that the reservoir is capable of supplying sufficient steam to generate 25 MW over a long period of time. The Takigami power plant will be fully operated in late 1996.
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