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Geothermal Energy

Science – Society – Technology

Fig. 5 | Geothermal Energy

Fig. 5

From: Stress sensitivity of porosity and permeability under varying hydrostatic stress conditions for different carbonate rock types of the geothermal Malm reservoir in Southern Germany

Fig. 5

Hydraulic properties of the investigated samples. a Porosity measured by different methods generally shows good agreement. Larger deviations of \({\varPhi }^{\mathrm{max}}\) (gray) are due to vuggy porosity and of \({\varPhi }^{\mathrm{MIP}}\)(black) due to heterogeneity of the sample material. b Relationship between porosity and permeability shows an increasing permeability with increasing effective porosity in the form of a power law, which is valid for estimating permeability for effective porosities up to 20%. c Permeability shows a distinct dependence on the effective pore throat size which controls the flow through the connected pore network

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