| Authors: |
Hideshi Kaieda, Yasuhiro Fujimitsu, Takeshi Yamamoto, Hideki Mizunaga, Keisuke Ushijima and Shunji Sasaki |
| Keywords: |
induced seismicity, geophysical methods, HDR, acoustic emission, electrical resistivity |
| Conference: |
World Geothermal Congress |
Session: |
SECTION 12 - Advanced Technologies (HDR - Magma - Geopressur |
| Year: |
1995 |
Language: |
English |
| Geo Location: |
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| Abstract: |
A 22 day water circulation test from a 1,000m deep injection well to a production well through two hydraulically fractured zones at about 720 m and 1000 m, was performed in at the Ogachi Hot Dry Rock (HDR) site in the fall of 1993. At the beginning of the circulation lest hypocenters of acoustic emission (i.e. microcosmic events) were distributed along the lower fracture progression direction which was considered as a main flow path arid apparent electrical resistivity anomaly measured by mise-a-la-masse measurements occurred near the same direction. Unfortunately, water recovery from the production well was small, only 4% of the injected water during the flow text. According to AE observations, it may be because the production well did not reach to the expected main flow path. |
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