【作者】 王闯； 朱前林； 黄春霞； 杨红； 范智涵；

【Author】 Wang Chuang;Zhu Qianlin;Huang Chunxia;Yang Hong;Fan Zhihan;College of Resources and Earth Sciences,China University of Miningand Technology;Ker Laboratory of Coal-based CO2 Capture and Geological Storage;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd;Shaanxi Key Laboratory of CO2Sequestration and Enhanced Oil Recovery;

【机构】 中国矿业大学资源与地球科学学院； 江苏省煤基CO2捕集与地质封存重点实验室； 延长石油(集团)有限责任公司研究院； 陕西省二氧化碳封存与提高采收率重点实验室；

【摘要】 CO₂驱油提高采收率（CO₂-EOR）被认为最具商业前景的CO₂地质封存形式。吴起油田于2016年开展了CO₂捕集、封存及利用（CCUS）的示范项目研究,采用考虑CO₂溶解效应的封存量计算方法,依据该油田各油区油藏储层地质条件以及采油情况,对油田16个油区主要储层CO₂理论封存量和有效封存储量进行评估,结果表明该油田CO₂理论封存量1.72×10⁸t,有效封存量4.31×10⁷t,其中,长官庙、薛岔、王洼子、铁边城4个油区封存潜力占该油田总封存潜力的49%。总封存潜力中,CO₂自由气、残余油溶解气以及地层水溶解气质量比例为35∶60∶5,其中致密油藏的石油的采收率较低、CO₂封存自由空间较小、地层水溶解能力远小于石油溶解能力使得残余油溶解的CO₂质量占封存量的大部分。更多还原

【Abstract】 CO₂ enhanced oil recovery（ CO₂-EOR） is considered to be the most promising form of CO₂ geological storage.Wuqi Oilfield has started the demonstration project of CO₂ capture,storage and utilization（ CCUS） from 2016.Based on the geological conditions and oil recovery of the 16 oil zones of the Wuqi oilfield,this study evaluated the CO₂ theoretical storage and effective storage capacity of the oilfield using the storage capacity calculation method considering the CO₂ dissolution effect.The results show that the CO₂ theoretical storage of the oilfield is 1.72×10⁸ t,and the effective storage is 4.31×10⁷ t.Among them,the storage potential of the four oil zones of Changguanmiao,Xuecha,Wangwazhi and Tiebiancheng accounts for 49% of the total storage potential of the oilfield.In the total storage potential,the ratio of free CO₂ gas,CO₂ dissolved in the residual oil and gas dissolved in the formation water is 35 ∶60 ∶5.The oil recovery of the tight reservoirs is low,the free space for CO₂ storage is small,and the formation water solubility is far less than the solubility of petroleum.Therefore,the majority of the stored CO₂ is dissolved in the residual oil.更多还原