Simulation of CO₂ distribution at the In Salah Storage Site using high-resolution field-scale models

Topic(s): Carbon capture use and storage (CCUS), CO₂ storage, Engineering and project delivery

This report describes the use of an invasion percolation modelling approach to simulate the CO₂ migration process at the Krechba field of the In Salah Storage Site in Algeria. The field-scale model involves 56 million cells with dimensions of 10x10x2 meters. This high-resolution model captures the reservoir heterogeneity with respect to both the fault and fracture distributions. The simulation results are reasonably consistent with the inferred CO₂ distribution after 5 years of injection, and indicate that the current distribution of CO₂ is principally related to the fracture network. Initial results for predictive simulations of the post-injection period are sensitive to, and principally constrained by, the fault distribution and the multiphase flow behaviour. The simulation results highlight the role that high-resolution heterogeneous field-scale models can play in developing a comprehensive storage monitoring program.

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