Safe and secure Carbon Capture and Storage (CCS) relies on a good knowledge of chemical and mechanical processes that can occur during subsurface CO2 injection. These processes affect the fluid flow properties in porous media (matrix or fracture systems). In large CCS projects, the goal is to scale up to gigatons (billion tons) of injected CO2 per year. On such huge CO2 storage operations, it is crucial to thoroughly investigate coupled processes at different length-scales, time-scales, and operational conditions. With the SaltPreCO2 project, we aim to get better knowledge about CO2 injectivity and containment.