成熟湖相页岩电性影响因素及导电机理探讨——以松南长岭凹陷青一段为例  

Influence factors and conduction mechanism of mature lacustrine shales:a case study of the first member of Qingshankou Formation in Changling Sag,South Songliao Basin

作　　者：党微 肖佃师 韩诗文 杨亮[1] 李卓 郑乐华 汪睿 DANG Wei;XIAO DianShi;Han ShiWen;YANG Liang;LI Zhuo;ZHENG LeHua;WANG Rui(Exploration and Development Research Institute of Jilin Oilfield,Songyuan 138000,China;School of Earth Science and Technology,China University of Petroleum(East China),Qingdao 266580,China;No.2 Geo-Logging Company of Daqing Drilling Engineering Company,Songyuan 138000,China)

机构地区：[1]吉林油田勘探开发研究院,松原138000 [2]中国石油大学(华东)地球科学与技术学院,青岛266580 [3]大庆钻探工程公司地质录井二公司,松原138000

出　　处：《地球物理学进展》2024年第5期1935-1950,共16页Progress in Geophysics

基　　金：国家自然科学基金项目(41972139,41922015)资助。

摘　　要：页岩导电性受矿物组分、流体类型、物性、成熟度等多种因素影响,电性与物性、含油性关系弱,急需明确页岩电性影响因素及导电机理.本文以松南长岭凹陷青一段成熟湖相页岩为研究对象,联合密闭取心和二维核磁共振、场发射扫描电镜、TOC、全岩等实验,系统分析了矿物组分、物性及流体类型等因素对页岩电性的影响程度,并探讨了成熟湖相页岩导电机理.结果表明,矿物组分(碳酸盐、黏土矿物)及流体类型对页岩电性具有较强影响,物性影响较弱.粉砂纹层页岩(含介壳灰岩)电性受碳酸盐、黏土矿物、含油饱和度、游离水、结合水、有效孔隙度影响,泥纹层长英质页岩或黏土质页岩电性受黏土矿物、吸附油、结合水影响.湖相页岩存在三类导电机制:黏土附加导电(Ⅰ型)、有机质和黏土复合体导电(Ⅱ型)、脆性矿物基质孔隙导电(Ⅲ型);粉砂纹层页岩主要发育Ⅲ型和Ⅰ型导电,泥纹层长英质和黏土质页岩主要发育Ⅰ型和Ⅱ型导电机制.研究成果对于丰富泥页岩导电机理、提升页岩饱和度解释精度具有指导意义.High clay content,a variety of pore forms,and complicated fluid occurrence are characteristics of shale reservoirs.Shale,s electrical conductivity is influenced by many factors,including its mineral composition,fluid type,physical properties and maturity,which leads to the weak correlation between electrical conductivity and oil content and physical properties.Therefore,it is critical to understand the conductive mechanism and influence factors of the electrical properties of shale.In this paper,the mature lacustrine shale of the first member of the Qingshankou Formation(Qing1 Member)in Changling Sag,south Songliao Basin is taken as an example.Using sealed coring,Two-dimensional nuclear magnetic resonance,field emission scanning electron microscopy,TOC,and X-ray Diffraction tests,combined with electrical logging curves,the impacts of fluid occurrence,physical properties and mineral composition on the electrical properties of the shale were analyzed,and then the conduction mechanism of mature lacustrine shale was addressed.The findings indicate that physical properties have a minor impact on shale electrical properties,while mineral composition(carbonates minerals,clay minerals)and fluid type have a significant impact.Silty-laminated shales(including shell limestone)are affected electrically by carbonate minerals,clay minerals,oil saturation,free water and bound water,argillaceous-laminated felsic shales and argillaceous-laminated clay shales are affected electrically by bound water,adsorbed oil,and clay minerals.For mature lacustrine shale,there are three different types of conductivity mechanisms:clay additional conduction(type I),organic matter and clay complex conduction(type II),and porous conduction of brittle mineral matrix(type III).Silty-laminated shales mainly develop conductivity mechanisms of porous conduction of brittle mineral matrix and clay additional conduction,whereas argillaceous-laminated felsic shales and argillaceous-laminated clay shale primarily develop conductivity mechanisms of clay addit

关 键 词：湖相页岩 含油性测试 电性影响因素 导电机理 长岭凹陷 

分 类 号：P631[天文地球—地质矿产勘探]