| Title | Stress State at the Ogachi Site |
|---|---|
| Authors | Koichi Shin, Hisatoshi Ito and Yasuki Oikawa |
| Year | 2000 |
| Conference | World Geothermal Congress |
| Keywords | rock stress, Kaiser effect, core disking, DSCA, shut-in pressure, AE |
| 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. |