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Multi-stage hydraulic stimulation experiments were conducted at the Bedretto Geothermal Testbed (Switzerland) at a depth of over 1 km to study seismo-hydromechanical processes at the hectometer scale.Eight intervals with a total length of 206 m were stimulated within a densely monitored, fractured granitic rock volume.Geological characterization shows that all intervals contain NE-SW striking, steeply dipping fractures, but the transmissivity and natural inflow vary between intervals.Reactivation pressures estimated from injectivity increases during stimulation indicate shear reactivation rather than hydraulic jacking, suggesting reactivation of pre-existing non-filled fractures.Overall, the seismo-hydromechanical response to stimulation is heterogeneous and indicates channelized flow.
Bröker et al. (Fri,) studied this question.
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