Geological and Geophysical Perspective of Supercritical Geothermal Energy in Subduction Zone, Northeast Japan

Noriyoshi Tsuchiya , Ryoichi Yamada
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引用次数: 6

Abstract

Geological and geophysical characteristics of supercritical geothermal reservoirs in the Tohoku District, NE Japan were investigated in order to evaluate potential of future geothermal energy. Geological information in the Tohoku District (caldera, hot spring hydrothermal alteration, mine, and granitoid) and geophysical data (gravity, MT and seismicity) were accumulated into GIS database. We can evaluate present volcanism and related events, geothermal structure, depth of heat source, fracture distribution, and existence of fluid by using the GIS database. We identify the following geological features in terms of geothermal resources: “Deep fluid input”, “Magma input”, “Geothermal gradient”, and “High temperature hot spring”, and we can classify the geothermal energy and potentials as follows: “Promising”, “Probable”, “Possible”, and “Potential”.

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日本东北部俯冲带超临界地热能的地质和地球物理远景☆
研究了日本东北地区超临界地热储层的地质和地球物理特征,以评价未来地热能源的潜力。将东北地区的地质信息(破火山口、温泉热液蚀变、矿山、花岗岩类)和地球物理资料(重力、MT和地震活动)积累到GIS数据库中。利用GIS数据库可以评价当前的火山活动及相关事件、地热构造、热源深度、裂缝分布、流体是否存在等。在地热资源方面确定了“深部流体输入”、“岩浆输入”、“地温梯度”和“高温温泉”等地质特征,并将地热能和潜力划分为“有希望”、“可能”、“可能”和“潜在”。
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