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We investigate the pore network geometry and permeability of six natural sandstones and carbonate rocks. Using 3D microtomographic images, we segment each rock sample into three phases: Solid matrix of grains, macropores containing void spaces, and a third microporous phase containing nanometer-sized pores beyond the resolution of the image. In the majority of our samples, the microporosity exists inside cements deposited as a secondary phase along the surface of grains. Within the macropores, the pore radius, coordination number, throat radius, and throat length display a power law relation with porosity. We also find that the permeability of the aggregate depends on the porosity following the relation k = k_0 \phi^{3.32}, where $\log{k_0} = 5.52$ (mD). The fraction of connected porosity shows a strongly nonlinear reduction with an increase in the volume fraction of microporous cement.

The Influence of Microporous Cements on the Pore Network Geometry of Natural Sedimentary Rocks