中国陆上油藏CO2封存潜力评估

CO2捕集与封存是减缓气候变化的一种关键的碳减排选择方案。将CO2注入油藏作为一种碳埋存方式引起广泛关注。作为判断某一国家、某一区域或某一具体储层是否适合CO2地质封存开展的重要依据之一,有必要在规划碳捕集与封存(CCS)项目前,对潜在的封存库进行封存潜力评估。本文在已有可公开的地质资料的基础上,评估了中国陆上216个油田实施CO2地质封存的潜力,并与相关研究结果进行了比较。结果表明:在满足埋存深度大于800 m的筛选条件下,当假设我国陆上油田全部用于CO2-EOR时,CO2封存潜力约3.6 Gt;当陆上油田全部视为废弃油藏处理时,CO2理论封存潜力约4.6 Gt。其中,东北和华北地区油藏封存CO2潜力巨大,占陆上油田CO2封存总量的60%以上;同时这里CO2集中排放源分布密集,排放源和封存地间的匹配性良好,可以减少CO2运输和封存成本。在这两个地区可以优先考虑实施油藏封存CO2项目。

Assessment of CO2 Geo-storage Potential in Onshore Oil Reservoirs, China

CO2 Capture and Storage(CCS)is a key carbon abatement option to mitigate climate change.As one of the important CO2 storage strategies,injection of CO2 into oil reservoirs,has drawn wide attention.At the beginning of a CCS project,storage capability of potential reservoirs should be estimated,which is important to determine whether a specific nation,area or storage unit is suitable for CO2 sequestration.In this study,216 onshore oil fields are assessed on their CO2 storage potential,based on published geological materials.Then the assessment results are compared with the results of associated researches.At last,the following conclusions can be obtained: under the conditions that the storage units are deeper than 800 m,the theoretical CO2 storage capacity is about 3.6 Gt when the onshore oil reservoirs of China are all used for EOR,and about 4.6 Gt when the reservoirs are all treated as depleted ones;CO2 storage potential of Northeast China and North China accounts for 60% of total CO2 potential of China.In these two areas,CO2 emission sources are densely distributed and well matches with storage sites,which can greatly reduce CO2 transportation cost.The findings indicate that priorities should be given to the implementation of the CO2 storage projects in these two areas.