Abstract: The carbon capture, utilization, and storage （CCUS） technology in oil and gas reservoirs is a crucial technological choice for China to achieve its “dual carbon” goals and a core technology for achieving net-zero emissions from fossil fuels. It offers both economic and ecological benefits and is a priority carbon reduction and efficiency enhancement technology given China’s current national conditions. To explore the potential for CO₂ storage in oil and gas reservoirs in oil and gas basins and to improve the suitability evaluation method for enhanced oil recovery （EOR）, taking the typical oil and gas reservoirs in the Dagang Oilfield Area of the Bohai Bay Basin as an example, based on a comprehensive comparison of evaluation methods for CO₂ storage potential in oil and gas reservoirs at home and abroad, combined with the actual situation of the Bohai Bay Basin and the types of data collected in this study, the ECO₂fys method is selected as the evaluation method for CO₂ storage potential in the study area’s oil and gas reservoirs. A dual-effect suitability evaluation method for storage-EOR is established, which is based on multiple factors such as oilfield storage potential, storage potential per unit area, crude oil properties, reservoir conditions, and oil reservoir conditions. Through comprehensive evaluation, the total CO₂ storage potential of ten oilfields in the Dagang Oil Region of the Bohai Bay Basin is calculated to be 2 934×10⁴ t, and the potential for CO₂ to enhance oil recovery is 97×10⁶ t. Among them, the Beidagang Oilfield, Zaoyuan Oilfield, and Wangguantun Oilfield can be prioritized for CCUS industrialization demonstration in the Dagang Oil Area. The suitability of CCUS in key oil and gas-bearing areas of the entire Bohai Bay Basin is evaluated and prospected using an analogy method. The estimated CO₂ storage potential in the Bohai Bay Basin’s oil and gas reservoirs is approximately 6.81×10⁸ t, with Shengli Oilfield having the largest storage capacity. The estimated potential for CO₂ to enhance oil recovery in the Bohai Bay Basin is approximately 22.66×10⁸ t. Areas such as the Western Jiyang Depression, the Southern Huabei Oilfield, the Northern Dagang Oilfield, and some offshore areas are suitable for prioritizing CO₂ storage and comprehensive utilization demonstration. The research results provide theoretical and technical references for promoting the commercialization process of CCUS in the Bohai Bay Basin and similar oil and gas basins.