The three-dimensional geometry and connectivity of pore spaces play a fundamental role in governing fluid transport properties of porous media. The total porosity and pore size distribution in atmospheric sandstone have been obtained through mercury-injection porosimetry and a gas adsorption method generalized as the BET method. However, the three-dimensional pore geometry is difficult to obtain under air and pressurized conditions. To quantify the flow-relevant geometrical properties of the pore structure in sandstone, we used the three-dimensional medial axis (3DMA) method of Lindquist et al. (2000) and verified three-dimensional data for different sizes of glass beads obtained by micro focus X-ray computed tomography. We verified the 3DMA method and measured distributions of pore size, throat size, channel length, and coordination number as well as correlations between pore and throat geometry. In addition, we present the quantitative characterization of each distribution for intact Berea sandstone and Berea sandstone pressurized to 25 MPa.

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