日本の地熱資源

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Characteristics of geothermal resources of Japan are summarized with special interests in their geological distributions. There are four kinds of hopeful geothermal resources in Japan i.e. super-heated steam high enthalpy thermal water in volcanic area, low enthalpy thermal water in sedimentary basin in non-volcanic region, hot dry rock and volcanic heat.<BR>Amongst them, the high enthalpy thermal water in volcanic area is most hopeful at present. It may be resulted from the fact that most of Japanese geothermal resources are distributed in a big volcano-tectonic depressed region which was formed at miocene. The depressed region is filled mainly with Neogene Tertiary volcanic rock in one or two kilometers thick and overlain by the clusters of volcanic cones of Qnaternary age. Such structure is probably preferable to the formation of high enthalpy thermal water which requires reservoir structure and the sufficient supplies of heat and water into it.<BR>National reserves of the superheated steam and high enthalpy thermal water which is able to be utilized for commeraly power generation are calculated to several ten thousands million kW. thousand year at least as far as the production wells are not deeper than 1.5 kilometers.<BR>Writer demonstrated that the attention of the prospecting hereafter should be focussed to the deeply seated geothermal resources which may be occured in pre-miocene fructured sedimentary rocks hidden beneath the miocene volcanic rocks of the neogene volcanotectonic depressed area in Japan.
社団法人東京地学協会の論文

日本の地熱資源

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