Stress State at the Ogachi Site
- Key words
- rock stress, Kaiser effect, core disking, DSCA, shut-in pressure, AE
- Location
- Ogachi, Japan
- Conference
- World Geothermal Congress
- Year
- 2000
- Session
- Exploration and Development
- Language
- English
- Paper number
- R0395
Full text
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Abstract
At the Ogachi site, where CRIEPI is undertaking a research project for Hot Dry Rock geothermal energy development, in-situ rock stress was measured by laboratory tests using the Acoustic Emission (AE) method and the Differential Strain Curve Analysis method (DSCA), together with core disking phenomenon and shut-in pressure. The results of the three - AE, DSCA, and core disking - were consistent with the azimuth of horizontal maximum stress. The direction of maximum stress is estimated as roughly NE-SW, and this direction is consistent with the estimated paths of fracture growth in hydrofracturing, although they are not simple at this site.
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