Abstract
Abstract This paper summarizes the results of a 4-year study regarding the implications of CO 2 exsolution on geological carbon storage security and subsurface flow management, including core-flood experiments, micro-model studies, pore-scale modeling, and relative permeability calculations. When separate phase CO 2 exsolves from carbonated water in sandstones, water relative permeability drops significantly. The relative permeability of exsolved CO 2 is disproportionately reduced compared to drainage due to the dispersed morphology of exsolved CO 2 bubbles in the pore space. Our studies suggest that CO 2 exsolution provides an opportunity for mobility control in subsurface processes. The low mobility of exsolved CO 2 suggests that risks of groundwater contamination due to this phenomenon are small.
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