Abstract
Abstract Maintaining caprock integrity is important to long-term geological CO2 storage. Worldwide, many depleted oil and gas reservoirs, and several current injection sites, are capped by anhydrite caprock. We investigated the effect of CO2 on the mechanical strength of Zechstein anhydrite, which caps many potential CO2 storage sites in the Netherlands. No short-term chemical effects of CO2 and pore fluid on the strength of anhydrite were observed. Reaction of bulk anhydrite with CO2-saturated solution was slow, though the relative fast reaction of fault gouge material (anhydrite+CO2+H2O→carbonates) could affect long-term mechanical behavior and transport properties.
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