The CCUS technology is in the ascendant, and the energy supplement utilization and geological storage are one of the current research directions. The feasibility of CO2 utilization and storage is systematically evaluated for the integrated structural gas reservoirs with edge and bottom water, and the advantages and disadvantages of CO2 energy supplement utilization are clarified, the main controlling factors of CO2 storage are screened, and the feasibility of CO2 utilization and storage in integrated gas reservoirs is recognized. For the foreign X gas field group with an average CO2 content of about 10%, and a preliminary study on the feasibility of CO2 storage is carried out on the basis of the construction of CO2 separation and capture devices in the block. Through reservoir engineering and numerical simulation, a relatively complete reservoir numerical model was established, a gas injection development plan was designed, the gas reservoir development and CCUS process were simulated, the potential risk of overall gas channeling during gas injection was analyzed, the key characteristics such as pressure and reservoir morphology were clarified, and the CO2 storage effect was evaluated. The theoretical research shows that the foreign X gas field group clarifies that the aquifer in the south of Y is the preferred storage area, and the D2 unit of P formation is the preferred storage layer. The output of CO2 in the production wells of the basic scheme is 40 million tons. After the implementation of the CCUS project, the total amount of CO2 injection is 60–180 million tons, and the corresponding net burial stock can reach 20–140 million tons. Comprehensive theory and practice, it is considered that the storage effect of foreign X gas field group is better and the storage potential is greater. This study provides support and reference for the priority technology development and efficient development and utilization of carbon emission reduction in similar oil and gas fields at home and abroad.