179 5. DEEP ERT/IP for geothermal exploration and de-risking Figure 5.16 Geological interpretation of the 3D ERT model. The Induced Polarization, despite an extremely heterogeneous chargeability in the first 200 m below the surface that partially hides the deeper signal, shows a very interesting correlation between a deep low chargeability zone (B Figure 5.17) and the conductive plume at about 500 m below sea level. Figure 5.17 IP section with high conductive plume. The analysis of both resistivity (rho) and chargeability (IP) results suggest that the high conductivity of the deeper layer (A, Figures 5.16 and 5.17) associated with the presence of a low chargeability area (B, Figure 5.17) could be interpretated as being linked to deeper fluids at higher temperatures. This is compatible with the presence of a low-enthalpy geothermal system.
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