Fig. 12

Crossplots of petrophysical parameters. a He-porosity vs. modelled porosity (Wadas and von Hartmann 2022) despite different scales and methods, the values fall into the same range; b modelled porosity vs. permeability; c He-porosity vs. permeability. He-porosity and permeability were measured at 30 MPa confining pressure. We observe no correlation between permeability and porosity. As an example, the regression factor for a linear correlation is provided in (b) and (c). Note, in (b) and (c), except for one outlier, the data cover only a fifth of one magnitude. Thus, to avoid feinting a non-existing correlation between porosity and permeability, we decided to plot permeability on a linear-scaled axis