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Geothermal Energy

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Fig. 3 | Geothermal Energy

Fig. 3

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. 3

Geological logs of both the GRT-1 and GRT-2 wells, based on the mineralogical quantities observed in cuttings. The reference depth is TVD for both wells. The facies are as follows: GRAN: granite, HLOW: low hydrothermal alteration grade, HMOD: moderate alteration grade, HHIG: high alteration grade, HEXT: extreme hydrothermal alteration, VEIN: quartz vein, GRAN_OX: oxidized granite, RED: reddish granite, PERM: Permian sandstone

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