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Acidic reactive flow in fractures is relevant in subsurface activities, such as CO2 geological storage and hydraulic fracturing. Understanding reaction-induced changes in fracture hydrodynamic properties is essential for predicting subsurface flows, such as leakage, injectability, and fluid production. In this study, X-ray computed tomography scans of a fractured carbonate caprock were used to create three-dimensional (3D) reconstructions of the fracture before and after reaction with CO2-acidified brine (Ellis, B.; Peters, C.; Fitts, J.; Bromhal, G.; McIntyre, D.; Warzinski, R.; Rosenbaum, E. Deterioration of a fractured carbonate caprock exposed to CO2-acidified brine flow. Greenhouse Gases: Sci. Technol. 2011, 1, 248−260). As expected, mechanical apertures were found to increase substantially, doubling and even tripling in some places. However, the surface geometry evolved in complex ways, including “comb-tooth” structures created from preferential dissolution of calcite in transverse sedimentary bands...

Modifications of Carbonate Fracture Hydrodynamic Properties by CO2-Acidified Brine Flow

Modifications of Carbonate Fracture Hydrodynamic Properties by CO₂-Acidified Brine Flow