Abstract
Abstract A comprehensive experimental approach has been used to assess the interrelation of CO 2 -mediated chemical reactions and transport properties in pelitic rocks. Sorption values on shale samples (P ∘ C) were high with maximum amounts of ∼44 kg/t. These capacities did not correlate with the organic carbon content, indicating sorption on and/or reaction with mineral components. Further, crushed shale samples were exposed to CO 2 in the presence of water at 15 MPa and 50 ∘ C for different time periods, showing significant changes in mineral composition. Reaction equilibrium was reached within periods of less than a month. Some of the caprock lithotypes could represent a significant sink for CO 2 deposited in the subsurface and could reduce the risk of leakage to the surface.
Published Version
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