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Geothermal Energy

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Fig. 18 | Geothermal Energy

Fig. 18

From: Porosity–permeability relationship derived from Upper Jurassic carbonate rock cores to assess the regional hydraulic matrix properties of the Malm reservoir in the South German Molasse Basin

Fig. 18

Dependency of porosity deviation between HEP and WIP methods related to different factors. a Porosity deviation becomes increasingly negative with increasing porosity. A positive deviation was mainly found for samples with low porosity. b Correlation of the porosity deviation with grain density suggests a dependency on lithology. c The porosity deviation seems not to be related to bulk volume (i.e., dimensions) of the sample. d The matrix shows the Pearson correlation coefficients of different parameters. Blue color represents a positive correlation, whereas red represents a negative correlation. (\(\phi_{\text{eff}}^{\text{He}}\)  = effective porosity (HEP), \(\phi_{\text{eff}}^{\text{w}}\)  = effective porosity (WIP), \(\rho_{\text{B}}\)  = bulk density, \(\rho_{\text{T}}\)  = grain density, \(V_{\text{B}}\)  = bulk volume, \(V_{\text{T}}\)  = helium grain volume, \(V_{\text{P}}\) = pore volume)

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