Abstract
Abstract This article summarizes the principal characteristics of the natural fluid circulation system at the Sumikawa Geothermal Field in northern Japan and relates them to local geological structure. Extensive two-phase flow prevails at intermediate depths (500 to 1000 m), and a very high transmissivity zone is present below a depth of about 1 km. This zone contains fluids with temperatures exceeding 300°C and is a suitable target for possible future development.
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