A coupled geochemical-transport-geomechanical model to address caprock integrity during long-term CO2 storage
van der Veer, E.F.
Underground storage of CO2 will lead to chemical fluid-rock interactions which may potentially alter the porosity and the flow patterns in faults. In this study, we present a coupled numerical model combining chemical fluid-rock interactions, aqueous diffusion, fluid flow, and mechanical processes, aiming at a better understanding of mineral reactions leading to changes of the rock properties, the associated flow patterns and the mechanical stability of faulted caprock on the long-term (500 yrs). In the examples that we studied the mechanical stability of the caprock system was not affected, but significant porosity changes were predicted for low-consolidated fault gouges. Coupled chemical-flow modelling is preferred over chemical modelling as this showed significantly higher porosity increases. Copyright 2015 ARMA, American Rock Mechanics Association.
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PG - Petroleum Geosciences
ELSS - Earth, Life and Social Sciences
American Rock Mechanics Association (ARMA)
49th US Rock Mechanics / Geomechanics Symposium 2015 Vol 4, 2458-2468