Comparison of Shale Permeability to Gas Determined by Pressure-Pulse Transmission Testing of Core Plugs and Crushed Samples

This paper proposes that the crushed-sample permeability can match the core plug permeability measurements when tests are repeated with sufficient number of different mesh size crushed samples instead of relying on a single mesh size sample testing and then extrapolating the results to the representative bulk volume size of shale formations. The formulations necessary for this approach are developed by considering the averaging of the matrix and fracture porosities over the crushed sample particle volumes and the non-Darcy behavior and adsorption of real gasses under the pore-proximity effects.