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Table 1 Requirements to be met by EGS according to Garnish (2002) and reservoir parameters of the Soultz-sous-Forêts EGS

From: Criteria and geological setting for the generic geothermal underground research laboratory, GEOLAB

  EGS requirement Soultz 3.5 km reservoir Soultz 5 km reservoir
Flow rate ( L s−1) 50–100 24 23
Mean wellhead fluid temperature (°C) 150–200 140 157.5
Effective heat exchange area >2·106 m2 N/A N/A
Rock volume (m3) >2·108 About 7·108 About 2.7·109
Hydraulic impedance <0.1 MPa L−1 s−1 0.06 MPa L−1 s−1 (GPK1, injection) 0.1 MPa L−1 s−1 (GPK1, injection)
0.06 MPa L−1 s−1 (GPK2, production) 0.05 MPa L−1 s−1 (GPK2, production)
0.25 MPa L−1 s−1 (GPK3, injection)
0.25 MPa L−1 s−1 (GPK4, production)
Water loss at the surface <10 % 0 % (Total reinjection) 0 % (Total reinjection)
  1. Data from the 3500 and 5000 m reservoirs were obtained in 1997 and 2011, respectively (modified after Schill et al. 2015)