Flow and reaction along the interface between hydrated Portland cement and calcareous rocks during CO2 injection. Laboratory experiments and modeling

To better understand the geochemical alteration of the interface between wellbore Portland cement and rock because of potential leakage during CO2 storage operations, we performed percolation experiments using three solid cores each made of two half-cylinders, one of hydrated Portland cement and the other of calcareous rock (limestone, marl or sandstone). These experiments were run under atmospheric (PCO2 = 10−3.4 bar and room temperature) and...