Fig. 5From: 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)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)Back to article page