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Carbon capture, utilization, and storage, one proposed method of reducing anthropogenic emissions of CO₂, relies on low permeability formations, such as shales, above injection formations to prevent upward migration of the injected CO₂. Porosity in caprocks evaluated for sealing capacity before injection can be altered by geochemical reactions induced by dissolution of injected CO₂ into pore fluids, impacting long-term sealing capacity. Therefore, long-term performance of CO₂ sequestration sites may be dependent on both initial distribution and connectivity of pores in caprocks, and on changes induced by geochemical reaction after injection of CO₂, which are currently poorly understood. This article presents results from an experimental study of changes to caprock porosity and pore network geometry in two caprock formations under conditions relevant to CO₂ sequestration. Pore connectivity and total …