Detailed Fracture System of the Soultz-sous-Forêts HDR Field Evaluated Using Microseismic Multiplet Analysis |
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| Authors: | H Moriya K Nakazato H Niitsuma R Baria |
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| Institution: | Department of Geoscience and Technology, Graduate School of Engineering, Tohoku University, Sendai, 980-8579 Japan. E-mail: hirokazu@ni4.earth.tohoku.ac.jp, JP
SOCOMINE, Soultz-sous-Forêts, France., FR
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| Abstract: | —?The reservoir structure of the Soultz HDR field has been investigated by examining induced microearthquake multiplets. Microseismic events with similar waveforms have been selected from microseismic data obtained during a 1993 hydraulic fracturing experiment. Precise relative arrival times and source locations have been determined by cross-spectrum analysis. The cross-spectrum analysis decreased the residual from 0.75?ms to 0.1?ms. The estimated orientations of the multiplet planes are consistent with fracture orientations detected in Soultz boreholes. A comparison between the stress field and the orientation of structural planes suggests that the structural planes were under a critical condition of frictional slip. |
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