Numerical Study of Gas Breakthrough in Preferential Rocks for Underground Nuclear Waste Repositories

During the long-term storage of radioactive waste, continuous generation gas in disposal area may influence integrity host rock. Thus, investigation migration and breakthrough low-permeability rock is indispensable for stability assessment. In this work, pore space models four potential rocks (Boom clay, COx argillite, Opalinus Beishan granite) were generated via binarization Gaussian random field. This method provides a randomly formed network that does rely on an initial definition shape. The constructed analyzed validated by using mathematical morphology. A numerical calculation scenario basis Young–Laplace equation was proposed applied. Results show pressures are 2.62–4.11 MPa Boom clay 3.72–4.27 argillite. It enhances idea capillary-induced possible at lower than fracture threshold. For granite, no connected pathway exists, more likely to occur through dilation or fractures. presented has advantage experimental reproducibility brings new fluid rocks.