Abstract
During carbon dioxide (CO₂) injection, CO₂ dissociates, dissolves in in-situ brines and forms a weak acid that reacts with the host rock. Fluid-rock interactions can influence long-term storage of CO₂. One of the biggest challenges in carbon storage in carbonate formations is to describe the complex interplay between flow, diffusion and reaction. This is additionally complicated by the wide range of pore sizes and connectivity encountered in carbonate porous media. At the pore scale, we combine high resolution imaging, core flooding and numerical simulations in order to describe the changes in pore structure and connectivity, induced by CO₂ storage in carbonates and to address reactive transport mechanisms. We use pore-scale imaging to study the impact of single phase high salinity brine saturated with supercritical CO₂ (sc CO₂) injection, in a set of different carbonate samples with different pore structures and connectivities. Flooding is performed under typical resservior conditions. The changes in por...
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