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Fig. 10 | Geothermal Energy

Fig. 10

From: On the geothermal potential of crustal fault zones: a case study from the Pontgibaud area (French Massif Central, France)

Fig. 10

Connected porosity and permeability measurements on sample taken from the Peyrouse 1 borehole (identical to those used for qualitative observations). The non-fractured and unaltered samples have the lowest permeability and connected porosity value. Conversely, the altered and fractured sample has the highest value of permeability and connected porosity. These purely qualitative degrees of alteration and fracturation are based on macroscopic, microscopic observations and three-dimensional visualization by X-ray micro-tomography analysis

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