Assessment of carbon dioxide plume behaviour within the storage reservoir and the lower caprock around the KB-502 injection well at In Salah

► A reservoir simulation study incorporating InSAR data and geomechanical analysis was performed. ► CO2 injection at KB-502 caused tensile failure of a pre-existing fault (zone) around the wellbore. ► Before March 2006, reactivation and lateral propogation of the fault zone was confined to C10. ► After March 2006, CO2 migrated into the fracture (fault damage) zone in the lower caprock (C20). ► Results suggest that a significant fraction of the injected CO2 could have migrated into C20 at KB-502.