碳封存能够实现全球CO2 的减排，但存在CO2 泄露，这将对人体健康，生态系统带来影响。CO2 驱油大规模发展首先取决于其安全性、在环保上是否具有持久性、可监控性和可操作性。开展CO2 驱油地区的大气环境影响研究是保证碳捕获利用与封存研发示范顺利发展的前提，是构建完备的法律、政策、规范框架的依据，对于CO2 封存工作健康的发展具有十分重要的意义。CO2 驱油地区的环境影响评估涉及地质、环境、石油勘探、工程热物理等研究领域，学科交叉性强，导致大气环境影响分析方法及评估系统尚未建立。本研究采用TOUGH2 软件对胜利油田纯梁地区高89-1 块地CO2 地质封存进行数值模拟，并根据该地区土壤CO2 通量和大气CO2 浓度对TOUGH2 软件的可靠性进行分析和修正，在此基础上对该地区大气的CO2 扩散规律进行模拟，建立TOUGH2 和大气扩散耦合模型对CO2 驱油地区的大气环境影响分析方法。

Carbon sequestration can potentially offset global CO2 emissions derived from the combustion of fossil fuels. Even with the large physical separation between storage reservoirs and surficial environment, there remains concern that CO2 stored may eventually leak back to the surface which would possibly lead to human health, ecological impacts at the ground surface. The technical feasibility of CO2 miscible flood demonstration projects depends on the safety, and the environmental persistence, manageability, operability. Atmospheric Environmental impact assessment on the area of CO2 flooding injection is the basis for building a comprehensive legal, policy, and normative framework, which is of great significance for ensuring the development of CO2 sequestration. Atmospheric Environmental impact assessment on the area of CO2 flooding injection has not been built up, due to this issue referring to many research fields, such as geological, environmental, oil exploration, and engineering thermophysics. In this study, the CO2 geological diffusion in Gao 89-1 block with CO2 flooding injection of Chunliang area of Shengli oilfield was simulated by TOUGH2. The results were modified by the soil CO2 concentration and flux, which would provide the input data to the atmospheric dispersion model. Atmospheric Environmental impact assessment using TOUGH2 and atmospheric dispersion coupled model would be pointed out with the purpose of the development of Carbon Capture, Use, and Sequestration demonstration.