Reservoir Evaluation of the Hijiori Hot Dry Rock Geothermal System
- Location
- Hijiori, Japan
- Conference
- Japan International Geothermal Symposium
- Year
- 1997
- Session
- Hot Dry Rock
- Language
- English
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Abstract
The natural fracture system at the Hijiori test site is described. The analysis of oriented cores and BHTV survey indicate fractures with E~W or ESE-WNW strike are predominant and major flow paths in the reservoir. The conductive fractures seem to be related with the ring fault of the Hijiori caldera. The flow regime in the deep reservoir is evaluated by the results of tracer experiments and PTS logs during circulation tests in 1995 and 1996. Severe interaction between the shallow and deep reservoirs was recognized during the tests. The PTS logs and tracer experiments reveal the connection from HDR-I to HDR-2a is much better than that to HDR-3.
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