Abstract
Residually trapped CO2 is often assumed to be stable when simulating its long-term fate in geological storage reservoirs. Ostwald ripening is a mechanism that could potentially cause remobilization. We compare the case of bubbles of gas in a free liquid to that of a solid porous matrix. Using a new continuous pore network model, we gain insights on Ostwald Ripening in rocks and estimate time scales of evolution of multi-ganglia systems. Evolution is found to be highly dependent on system initialization as well as on pore structure. For residually trapped CO2 in homogeneous rocks, a stable equilibrium is conceptually possible.
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