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Geothermal Energy

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Fig. 7 | Geothermal Energy

Fig. 7

From: How do the geological and geophysical signatures of permeable fractures in granitic basement evolve after long periods of natural circulation? Insights from the Rittershoffen geothermal wells (France)

Fig. 7

Comparison of the measured and calculated electrical logs. a From left to right: measured apparent resistivity, contribution of the porosity to the calculated resistivity (Archie term), contribution of the clays to the calculated resistivity, and recalculated synthetic resistivity. Red zones indicate permeable fracture zones. b Consequences of the independent weighting of the Archie term (y-axis) and the clay term (x-axis) for the fit of the resistivity model [RMS in log(ohm m)]. The optimal solution includes two independent coefficients (red cross) and produces the lowest RMS value (dark blue)

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