NEDO has been carrying out a project of evaluating the potentials of the deep-seated geothermal resources in Japan with several parameters such as temperature and permeability, which have been estimated using several kinds of stochastic methods and/or numerical reservoir simulation. The objective is to establish basic strategy for developing deep-seated geothermal resources in Japan. After finalizing the studies in the Kakkonda geothermal field, where the deep reservoirs is formed around the intrusive rocks, we have stated detailed studies on the deep-seated geothermal resources at the other Japanese fields have since 1999, choosing two model fields, the Uenotai (Tohoku area, northern part of Japan) and the Otake-Hatchobaru geothermal fields (Kyushu area, southern part of Japan). The reservoirs at the both fields are recognized as highly fault-controlled systems, a typical geothermal system in Japan. In addition, the Sumikawa-Onuma geothermal field in Tohoku area and the Ogiri geothermal field in Kyushu area are being studied in order to discuss the reliability of the estimation by the stochastic analysis and numerical simulation. Furthermore, databases of reservoir parameters such as temperature, pressure and permeability have been developed for the major geothermal fields in Japan including the above-mentioned fields, which helps us to not only utilize the stochastic methods but also construct the reliable numerical models.

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