Figure 3.
The image depicts three models of porous stone represented as cylindrical structures. Model A shows constant initial porosity with connected path 1 and path 2 highlighted in blue and orange, respectively, along with other components. Model B also displays constant initial porosity, featuring connected path 1, path 2, and an unconnected section. Model C illustrates heterogeneous initial porosity with various colours indicating density, including connected paths and unconnected sections. Below these models, connected path 1, connected path 2, unconnected section 1, and unconnected section 2 are shown, each labelled with volumetric percentages to illustrate their respective structures and connectivity.Model configurations in terms of distribution of permeability and porosity zones (a). Distribution of connected and unconnected paths in the models and their corresponding volumes (b)