7 Contents Chapter 5 • DEEP ERT/IP for geothermal exploration and de-risking 165 A. Rosselli, C. Truffert, F. Barsuglia, F. Fischanger, A. Coletti, G. Morelli and S. Del Ghianda 5.1 Context 165 5.2 Why electrical resistivity tomography is useful? 166 5.3 Deep electrical resistivity tomography for geothermal exploration – an Italian example 166 5.3.1 Unconventional ERT data acquisition 167 5.3.2 Acquisition methodology 169 5.3.3 Acquisition layout 170 5.3.4 Current transmissions 172 5.3.5 Quality control 173 5.3.6 Processing of resistivity and chargeability measurements 175 5.3.7 Results 177 Conclusion 180 Chapter 6 • The use of passive seismic methods for Geothermal exploration and monitoring 181 T. Kremer, J. M. Ars, T. Gaubert-Bastide, K. Khazraj and C. Voisin Introduction 181 6.1 Methods 185 6.1.1 Seismological analysis 185 6.1.2 Ambient noise seismic interferometry (ANSI) 189 6.1.3 Tomography 190 6.1.4 Monitoring 191 6.2 Passive seismic methods for geothermal exploration 193 6.2.1 Seismological analysis 194 6.2.2 Ambient noise seismic interferometry (ANSI) 204 6.2.3 Integration into the geothermal exploration workflow 206 6.3 Geothermal monitoring 208 6.3.1 Seismological analysis monitoring 208 6.3.2 Ambient noise seismic interferometry monitoring 210 Concluding remarks 214 References 216
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