Cover image by Yuliang Su on pages 203-217. The image illustrates the microscopic process of CO2 entering the shale micro-nano heterogeneous porous media in the high temperature and high pressure chamber. When CO2 is injected along the fracture, the formation pressure gradually increases to the condition of oil and gas miscibility, and CO2 molecules will diffuse into the matrix to replace the crude oil, highlighting the migration of CO2 in the complex pore structure and the dynamic mechanism of the oil and gas interface during huff-n-huff.