CO_(2)作为垫气的气藏型储气库工作气量评价及影响因素分析  

Evaluation of Working Gas Volume and Influencing Factors in Gas Storage Reservoirs Utilizing CO_(2)as Cushion Gas

作　　者：秦佳正 邱帅 乔宇 汤勇[1] 何佑伟 QIN Jiazheng;QIU Shuai;QIAO Yu;TANG Yong;HE Youwei(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Petro China Jidong Oilfield Company,Tangshan 063000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,成都610500 [2]中国石油冀东油田分公司,唐山063000

出　　处：《华南师范大学学报(自然科学版)》2025年第1期1-12,共12页Journal of South China Normal University(Natural Science Edition)

基　　金：四川省自然科学基金项目(2023NSFSC0935)。

摘　　要：枯竭气藏改建为储气库是实现天然气供需平衡的重要策略。CO_(2)作为储气库的垫气,可以同时带来经济效益与环境保护的双重优势。为提高该类型储气库工作气量评价的效率与准确性,分析了CO_(2)作为垫气的枯竭气藏改建储气库的建库模式。基于气藏物质平衡原理,考虑CO_(2)与CH_(4)在地层水中的溶解以及水体的影响,建立了该类型储气库的工作气量评价模型,并对水体倍数、束缚水饱和度、地层温度等因素对储气库工作气量的敏感性进行了分析。结果表明:水体倍数、原始地层压力、束缚水饱和度和地层温度与储气库工作气量呈正相关,而气藏废弃压力、地层水矿化度和垫气注入量则呈负相关。垫气注入量对储气库工作气量的影响最显著,相关性系数达到-0.7773;水体倍数的影响次之,相关性系数为0.4596;地层温度对储气库工作气量的影响最弱,相关性系数仅为0.0027。研究成果为未来更多枯竭气藏改建储气库的工作气量设计与评价提供了理论指导。The transformation of depleted gas reservoirs into gas storage facilities serves as a vital strategy for balancing natural gas supply and demand.Utilizing CO_(2)as cushion gas provides dual advantages of economic benefits and environmental protection.Enhancements in the efficiency and accuracy of working gas volume evaluation for this type of storage are achieved by analyzing the construction model of gas storage facilities converted from depleted gas reservoirs with CO_(2)as the cushion gas.Grounded on the principle of material balance in reservoirs,this study incorporates the solubility of CO_(2)and CH_(4) in formation water and the effects of water body to develop a working gas vo-lume evaluation model.A sensitivity analysis of factors such as water body multiples,bound water saturation,and formation temperature on the working gas volume of the storage facility was conducted.Results indicate that water body multiples,original formation pressure,bound water saturation,and formation temperature positively correlate with the working gas volume,whereas abandoned reservoir pressure,water salinity,and cushion gas injection vo-lume exhibit negative correlations.Among these,the injection volume of cushion gas significantly influences the working gas volume with a correlation coefficient of-0.7773;water body multiples have a secondary impact with a coefficient of 0.4596,while formation temperature has the least effect,yielding a coefficient of only 0.0027.The findings offer theoretical guidance for the design and assessment of working gas volume in further transformations of depleted gas reservoirs into gas storage facilities.

关 键 词：储气库 CO_(2)作垫气 枯竭气藏 物质平衡 工作气量 敏感性分析 

分 类 号：TE4[石油与天然气工程—油气田开发工程]