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Modeling of Capillary Sealing Fractures during CO2 Injection by Non-Matching Multi-block Grids

Summary. Among open scientiﬁc challenges facing large scale implementation of CO 2 sequestration, are geological structures at diﬀerent scales not properly dealt with at the injection scale. Faults and fractures, in particular, could have large impacts on the ﬂow dynamics and CO 2 leakage to the atmosphere. In order to give a full 3D representation to these sensitive zones we present an approach for simulating multiphase ﬂuid ﬂow on non-overlapping, non-matching, multi-block grids. Capillary pressure and relative permeability properties of fault zones are explicitly taken into account in this approach. The underlying technique was implemented in the framework of a domain decomposition leading to development of a multilevel multigrid iterative scheme. Diﬀerent interpolation methods between the coarse and ﬁne grids in the fault zones have been tested leading to an improved implicitness, and thus allowing larger time step sizes to be taken. Results of numerical experiments for a simpliﬁed, but computationally demanding reservoir models are presented.