Multiscale mixed finite element, discrete fracture-vug model for fluid flow in fractured vuggy porous media

In this work, we use a multiscale mixed finite element method (MsMFEM) for fluid flow in fractured-vuggy media using the discrete fracture-vug model. By combining MsMFEM with the discrete fracture-vug model, we aim towards a numerical scheme that facilitates fractured vuggy reservoir simulation without upscaling. MsMFEM uses a standard Darcy model to approximate the pressure and velocity on a coarse grid, whereas fine scale effects are captured through basis functions constructed by solving local flow problems using the discrete fracture-vug model. The accuracy and the robustness of MsMFEM are shown through several examples. In the first example, we consider Beavers-Joseph model and then compare the analytic solution. We use the MsMFEM in more complex models. The results indicate that the MsMFEM is a promising path toward direct simulation of highly resolution geomodels.