延长石油创新将煤化工CO₂捕集与油藏CO₂封存相结合，实现了煤炭清洁利用、碳减排和原油增产等多重效益，探索形成了一条煤化工产业低碳发展的新路径。系统阐述了延长石油CCUS全流程一体化技术及矿场实践，形成了煤化工低温甲醇洗低成本CO₂捕集技术，捕集成本105元/t，捕集示范规模30万t/a；建立了CO₂封存选址及潜力评价方法，评价油田CO₂理论封存量为8.84×10⁸ t，封存适宜区主要分布在油田西部；揭示了跨时间尺度油藏CO₂封存状态演变规律，水气交替注入情景下CO₂封存10年和100年对应的构造、束缚、溶解和矿化封存量占比分别为24.38%、27.19%、48.38%、0.05%和15.09%、38.65%、45.77%、0.49%；创建了盖层封闭性评价方法，明确化子坪CO₂封存试验区长4+5盖层主要为Ⅰ、Ⅱ类；构建了“三位一体”CO₂安全监测体系，监测未发现CO₂地质泄漏，封存安全等级为Ⅰ级，矿场实现CO₂安全有效封存10.12×10⁴ t。煤化工CO₂捕集与油藏CO₂封存矿场实践取得了良好的碳减排与原油增产效果，相关创新技术应用前景较为广阔。

Through the innovative combination of CO₂ capture in the coal chemical industry and oil reservoir CO₂ storage, Yanchang Petroleum has realized multiple benefits such as clean utilization of coal, carbon emission reduction, and crude oil production increase, and explored a new path for low-carbon development of coal chemical industry. The whole process integration technology and field practice of carbon capture, utilization, and storage (CCUS) from Yanchang Petroleum are systematically presented. For CO₂ capture, the low-temperature methanol washing and low-cost CO₂ capture technology of the coal chemical industry has been formed. The CO₂ capture cost is 105 yuan/t, and the capture demonstration scale is 300000 t/a. For CO₂ storage, the storage site selection and potential evaluation methods are established. The evaluation results showed that the theoretical CO₂ storage capacity of the oilfield is 8.84×10⁸ t, and the suitable storage area is mainly distributed in the west of the oilfield. In addition, the evolution laws of CO₂ storage state across the time scale of storage are revealed. Under the water-gas alternation scenario, the proportions of CO₂ storage capacity for structure, residual, solubility and mineral trapping corresponding to 10 years and 100 years is 24.38%, 27.19%, 48.38%, and 0.05%; and 15.09%, 38.65%, 45.77% and 0.49%, respectively. Then the sealing evaluation methods of the caprocks are created. It is specified that the Chang 4+5 cap layer in the Huaziping CO₂ sequestration test area mainly belongs to type Ⅰ and type Ⅱ. Finally, a “Trinity” CO₂ safety monitoring system is established. The results of safety monitoring show that, there is no CO₂ geological leakage in the test area and the safety level of CO₂ storage is Ⅰ. The safe and effective storage capacity of CO₂ is 10.12×10⁴ t in the field application. The technology of CO₂ capture in the coal chemical industry and reservoir CO₂ storage has achieved good effects of carbon reduction and crude oil production increase in field practice.