Inferring Hydraulic Pressure Changes from Induced Seismicity Observations: Three Showcases from Geothermal Reservoirs

Figure 9

(a) Temporal evolution of cumulative fluid pressure changes determined from repeated slips at the 4 locations in the reservoir indicated by corresponding colours in the small figure inset. A constant stress drop of 0.5 MPa is assumed. Contour line in the figure inset denotes the main region of seismic activity. (b) Temporal evolution of the calculated pressure changes in the wellbore at a depth of 3,818 m (open-hole section) during well control operations in July 2013 and well cleaning activities in September/October 2013.