Numerical Prediction About The Storage And Security On Deformation Of Rock Strata With Fault After The Escape Of CO₂

In ancient time, the carbon generated by earth is absorbed by the green plants and marine. They made the carbon into hydrocarbons such as oil or coal or limestone and so on. In the past100years, people have made more and more industrial productions, which led to the unrestricted greenhouse gas. As the plant cover and forests are reducing, the rise of CO2is more than the absorption capacity of plants and the ocean. Therefore, in recent years the global temperature is rapid warming. The carbon emission reduction has become one of the main topics for the international environmental protection in recent years. The way which is more practical and efficient is the technique that can capture and bury carbon is named the storage technology of CCS.Usually, the CCS buries CO2in deep rock stratum or geologic structure which is near the ocean. Although CCS storage technology is feasible in theory and practice, not all layers are suitable for storage of CO2. Because of CO2geological storage will change the stress state under the surface of the earth, which will lead to a large displacement in the rock stratum, especially for those which have fractures and this rock will produce a larger deformation. When the geologic structure which is used to bury CO2is not hard enough or even though it exists some crack defects, it may cause adverse effects in the storage of CO2, even capping rock fracture damage, lead to CO2escape out, lost the original seal rock. So the rock with some crack defects should pay more attention to its influence on CO2sequestration.This paper is based on the Norwegian Sleipner gas CCS project as an example, by FLAC2D two-phase flow calculation, and respectively set up four different direction of the fracture distribution, working condition of nine different model of cap rock of CO2injection formation after stored near crack response, and vertical displacement of fracture around were analyzed. Moore-coulomb model is used to simulate the mechanical behavior of cap rock crack in the rock, rock formations in the model are built of different rock permeability, rock uniaxial compressive strength and different penetration time factors such as central vertical displacement on the impact of rock were analyzed.