Cement CO2-alteration propagation at the well-caprock-reservoir interface and influence of diffusion

► Geochemical model of wellbore-caprock-reservoir interface in CCS context. ► Fine spatial (2 mm) discretisation for short-term (1 year) analysis. ► Detailed spatial variations of main mechanisms of cement degradation. ► Porosity tracking due to mineral transformation of the cement phase. ► Sensitivity analysis on transport parameters.