In this paper the mechanism of seismic events induced by reservoir stimulation in EGS (Enhanced Geothermal System) are studied and compared with in Petroleum Engineering. For releasing of deformation energy there are the necessary and sufficient conditions, which must be satisfied. But for releasing of a great amount of deformation energy there must be a big shear failed volume, which appears not only at the front of fracture propagation but also behind it. A numerical simulation of micro-earthquakes induced by reservoir stimulation in the deep heat mining project Basel was carried out. The kinetic energy and local magnitude during the calculation was continuously registered. It was found that the kinetic energy has a good relationship with the injection rate and the stimulated volume in the rock depends strongly on the injection volume.

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