| Title | Imaging Induced Microseismicity During the 1993 Injection Tests at Soultz-Sous-forets, France |
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| Authors | R.H. Jones, A. Beauce, A. Jupe, H. Fabriol and B.C. Dyer |
| Year | 1995 |
| Conference | World Geothermal Congress |
| Keywords | microseismicity, fluid injections, HDR |
| Abstract | As part of the 1993 work programme at the European Hot Dry Rock (HOR) site at a series of stepped injections with flow rates of up to 50 l/s were carried out over an openhole section from 2850 to 3600 m measured depth in the borehole In total around 45,000 of water were injected during September and October 1993. During the injection tests about 19,000 micro-earthquakes were recorded of which some 16,000 have been located. The typical event rate was over one thousand a day and seismic monitoring was continuous throughout the experimental period. The imaged seismic cloud is seen to contain several distinct features with azimuths varying from N-S to NW-SE. A strong correlation between flow and seismicity is also observed. |