A coupled geochemical-transport-geomechanical model to address caprock integrity during long-term CO2 storage
conference paper
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.
Topics
TNO Identifier
535435
ISBN
9781510810518
Publisher
American Rock Mechanics Association (ARMA)
Source title
49th US Rock Mechanics / Geomechanics Symposium 2015
Vol 4
Vol 4
Pages
2458-2468
Files
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