Effect of CO2 injection on chalk properties - are Danish chalk reservoirs suitable for CO2 storage?

Are depleted oil and gas reservoirs in the Danish North Sea suitable for CO2 storage?

EOR (Enhanced Oil Recovery) studies with CO2 have shown that CO2-induced disturbance of in situ geochemical equilibria causes calcite dissolution of the rock frame, inevitably changing geomechanical properties. However, the magnitude and mechanism in which calcite dissolution causes changes in geomechanical properties are both uncertain and complex because dissolution is related to conditions and amounts of injected CO2. Thus knowledge gaps exist, and significant negative consequences of CO2 injection/storage may reject offshore chalk reservoirs (e.g., deplete petroleum reservoirs) as suitable for CO2 storage. Accordingly, this project aims to quantify and describe effects on geomechanical chalk properties due to CO2 injection and storage.