Impact of time-dependent deformation on geomechanical risk for geologic carbon storage

This paper investigates the consequences of time-dependent deformation on stress changes and resulting geomechanical risks from injection CO2 into geologic reservoirs. Using 3D fully coupled fluid flow-geomechanics simulations, it is shown that when occurs in caprock, shear decreases caprock but increases reservoir. The magnitude this transfer to reservoir affected by characteristic time scale adjacent formations. Compared an elastic response, viscoelastic produces a higher possibility fault failure within during after injection. implication if neglected assuming purely behavior risk will be underestimated.