Numerical Simulation of Gas Migration in Water-Saturated Argillite

In order to assess the performance of radioactive waste repository, the investigation of gas migration process through the formation of fully water-saturated Cox argillite is indispensable. Traditional methods, based on macroscopic approaches or homogeneous transport properties, are inappropriate to analyze this issue at the meso/microscopic scale. In this study, using the experimental pore size distribution curve, the morphological aspect of porous network is represented by the excursion of Gaussian Random Field. Essentially, the extraction of accessible pores for a given gas pressure is feasible via the morpho-mathematical transformations. This modeling work focuses on the estimation of capillary induced breakthrough pressure and the identification of adequate gas transport mechanisms for breakthrough process.