6 Geophysics in Geothermal Exploration Chapter 2 • Surface geophysical methods 51 J.-L. Mari and G. Paixach 2.1 Physical properties of rocks and pore space properties 55 2.1.1 Porosity 57 2.1.2 Permeability 58 2.2 Geophysical methods 61 2.2.1 Gravity method 63 2.2.2 Magnetic method 68 2.2.3 Electrical and EM methods 69 2.2.4 Seismic methods 80 Conclusion 107 References 108 Chapter 3 • Borehole geophysical methods 115 J.L. Mari 3.1 Conventional logging methods 116 3.2 Hydrogeological methods 120 3.3 Full waveform acoustic methods 123 3.4 Borehole seismic method 129 Conclusion 140 References 141 Chapter 4 • Towards a revisited geothermal conceptual model in the Upper Rhine Graben 145 A. Genter, C. Baujard, C. Glaas and V. Maurer 4.1 Geothermal development in the Upper Rhine Graben 146 4.2 Evolution of the geothermal concept during the SsF adventure 148 4.3 Pre-exploration phase 153 4.4 Optimizing borehole design according to the geological knowledge of the reservoir 159 Conclusion and perspectives 160 Acknowledgments 161 References 161
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