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Fig. 2 | Geothermal Energy

Fig. 2

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. 2

Composite log of the GRT-2 granitic basement, including alteration mineral quantities from cutting observations and the following geophysical logs: resistivity, temperature, mud losses, rate of penetration (ROP), gamma ray, porosity, and density. The permeable fracture zones (in red) were deduced from the complete data set presented here and were based on the previous studies (Vidal et al. 2017). The gray areas represent loss of data due to well temperatures that were too high. The facies are as follows: GRAN: granite, HLOW: low hydrothermal alteration grade, HMOD: moderate alteration grade, HHIG: high alteration grade, VEIN: quartz vein, RED: reddish granite

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