鄂尔多斯盆地东缘盒4段气层低阻成因机理  

Genetic Mechanism of Low Resistivity of He4 Gas Reservoir in the Eastern Margin of Ordos Basin

作　　者：马遵敬 刘彦成 李辉 曹鹏飞 MA Zunjing;LIU Yancheng;LI Hui;CAO Pengfei(Engineering Technology Company,CNOOC Energy Technology & Services Limited,Tianjin 300452,China;Research Institute of Petroleum Exploration and Development,Beijing 10083,China;Research and Development Center,China United Coalbed Methane Company,Beijing 100037,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452 [2]中国石油勘探开发研究院,北京100083 [3]中联煤层气有限责任公司研发中心,北京100037

出　　处：《西安石油大学学报（自然科学版）》2022年第2期16-24,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中海油发展科技项目“临兴区块致密砂岩气藏储层伤害评价及预防技术研究”(HFKJ-GJ2020-02);中海石油中国有限公司重大科技专项“中联公司上产60亿方关键技术研究”(CNOOC-KJ 135 ZDXM 40)。

摘　　要：鄂尔多斯盆地东缘盒4段含气层普遍具有低阻特征,识别难度较大,且成因机理尚不明确,制约了储层产能评价和预测工作的开展。为实现盒4段致密气藏天然气高效开发,在总结该区低阻气层测井响应特征的基础上,基于岩心分析、地层水组分、测井、试气和生产资料分析,从宏观和微观两个方面入手,开展区内气层低阻成因研究。研究表明:该区低阻气层发育的主控因素有两个方面,宏观上主要由沉积作用和成岩作用从根本上决定储层的岩性、孔隙结构及地层水特征等,控制低阻气层的发育及分布;微观方面主要是因复杂孔隙结构引起高饱和度束缚水(毛细管水)而形成较好的导电网络导致低阻;此外,薄膜型的黏土矿物及金属矿物直接或间接增加导电性引起气层低阻,高矿化度地层水或泥浆侵入以及砂泥岩薄互层亦可引起低阻。The gas bearing reservoirs in HE4 member of the eastern margin of Ordos basin generally have the characteristics of low resistivity and are difficult to be identified,and their genetic mechanism is not clear,which restricts the productivity evaluation and prediction of the reservoirs.In order to efficiently develop the natural gas in He4 tight gas reservoirs,on the basis of summarizing the logging response characteristics of the low resistivity gas reservoirs in this area,the genesis of the low resistivity gas reservoirs is studied from macro and micro aspects according to core,formation water composition,logging,gas testing and production data analysis.The results show that there are two aspects of controlling factors for the development of low resistivity gas reservoirs in this area.Macroscopically,sedimentation and diagenesis fundamentally determine the lithology,pore structure and formation water characteristics of the reservoirs and control the development and distribution of low resistivity gas reservoirs.Microscopically,high saturation irreducible water(capillary water)caused by complex pore structure forms a better conductive network,resulting in low resistivity;In addition,thin-film clay minerals and metal minerals directly or indirectly increase the conductivity,resulting in low resistivity of gas reservoirs,and invasion of formation water or mud with high salinity and thin interbedding of sand and mudstone also cause low resistivity of gas reservoirs.

关 键 词：低阻气层 成因机理 盒4段 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]