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

Figure 11

(a) Temporal evolution of cumulative fluid pressure changes determined from overlapping slips at the 8 locations in the reservoir indicated by corresponding colours in the small figure inset. A constant stress drop of 0.1 MPa is assumed. Contour line in the figure inset denotes the main region of seismic activity after projection and rotation operations. The black star denotes the injection point of the well Paralana-2. (b) Temporal evolution of the pressure changes measured at the wellhead of Paralana-2 during the main stimulation in July 2011. Pressure changes were determined by subtracting the initial overpressure of 27 MPa from pressure readings.