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Fig. 5 | Geothermal Energy

Fig. 5

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. 5

Identification of fractures from geophysical logs in the GRT-2 well. a Major permeable fractures identified at 2900 m MD in the caliper log. The black arrows indicate the cave visible in the hole radii (left) in the oriented caliper log (right) to fit a sinusoid with at least three points. b Acoustic image log with visible sinusoids representing natural fractures, identified and interpreted from Vidal et al. (2017)

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