Abstract
The diffusion coefficients of methane, iso-butane and n-butane through dry and water-saturated sandstones and their dependence on relative molar mass are discussed. The diffusion of iso-butane is anomalously fast in dry sandstones and that of methane is anomalously low in water-saturated sandstones. A three-dimensional computer model of the pores and throats in the sandstone has been developed. Simulations have been made of the sandstone's porosity, surface area, pore and throat size distribution, tortuosity, mercury porosimetry primary drainage curve, average pore connectivity and diffusion coefficient for mixed gaseous alkanes.
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