苏北盆地溱潼凹陷古近系阜宁组页岩油储集空间特征及其影响因素  

Storage Spaces Characteristics and Influencing Factors of Shale Oil Reservoirs of Paleogene in Funing Formation of Qintong Sag,Subei Basin

作　　者：蔡潇 夏威 马晓东 臧素华 丁安徐 刘玉霞 花彩霞 朱一川 李辉 Cai Xiao;Xia Wei;Ma Xiaodong;Zang Suhua;Ding Anxu;Liu Yuxia;Hua Caixia;Zhu Yichuan;Li Hui(East China Oil and Gas Company Exploration and Development Research Institute,SINOPEC,Yangzhou 225007,Jiangsu,China)

机构地区：[1]中国石油化工股份有限公司华东油气分公司勘探开发研究院,江苏扬州225007

出　　处：《吉林大学学报（地球科学版）》2024年第5期1482-1493,共12页Journal of Jilin University：Earth Science Edition

基　　金：中国石化科研项目(P21112,P23190)。

摘　　要：随着技术发展和研究深入,越来越多的学者认识到页岩油储层特征的研究对于“甜点区/段”的优选至关重要。为了对苏北盆地溱潼凹陷古近系阜宁组二段页岩油储层进一步勘探评价和规模开发工作,本文采用扫描电镜、薄片观察等方法,通过对苏北盆地阜宁组二段页岩油储层开展含油性、储集性、可动性和可压性等“四性”研究,精细刻画储集空间特征,分析影响储集性的主控因素。研究结果表明:阜宁组二段主要发育纹层状和层状灰云质页岩,矿物组成主要为黏土矿物(平均体积分数为35.4%)、长英质矿物(平均体积分数为39.1%)和碳酸盐矿物(平均体积分数为19.8%),该储层w(TOC)为0.5%~2.0%,R_(o)为0.9%~1.1%,孔隙度为1.8%~5.2%。纹层状构造是阜宁组二段页岩最显著的组构特征,主要由长英质与黏土质纹层组成。根据有机质丰度+构造特征+岩性特征,阜宁组二段页岩可划分为6种岩相,依据“四性”综合评价,中有机质纹层状含灰云页岩、中有机质层状含灰云页岩和中有机质纹层/层状灰云质页岩为优势岩相。主要储集空间类型为层理缝、构造缝、粒间孔和黏土矿物晶间孔,但不同岩相的储集空间类型各有差异,主要受岩性矿物组成、纹层发育程度和微幅构造作用等因素影响。综合6种岩相“四性”分析,阜宁组二段的中部、下部纹层状和层状含灰云页岩是页岩油勘探开发的地质甜点段。With the development of technology and research,more and more scholars have realized that the study of shale oil reservoir characteristics is very important for the selection of“sweet spots/segments”.By studying the“four characteristics”of the shale oil reservoir in the Second Member of Funing Formation,Subei basin,such as oil content,reservoir property,mobility,and compressibility,the reservoir space characteristics are described in detail,and the main controlling factors affecting the reservoir property are analyzed,which provides strong support for further exploration and evaluation and large-scale development in this area.The results show that the Second Member of Funing Formation mainly develops laminated or layered shale,and its mineral composition is clay minerals(35.4%on average),felsic minerals(39.1%on average),and carbonate minerals(19.8%on average),w(TOC)is 0.5%-2.0%,R_(o) is 0.9%-1.1%,and porosity is 1.8%-5.2%.The lamellar structure is the most prominent fabric feature of the shale in the Second Member of Funing Formation,which is mainly composed of felsic and clay lamination.According to the characteristics of“abundant organic matter+structural characteristics+lithology”,the shale of the Second Member of Funing Formation can be divided into 6 lithofacies.According to the comprehensive evaluation of“four characteristics”,the medium organic laminated/layered shales are the favorable lithofacies.The main reservoir space types are bedding seams,structural seams,intergranular pores,and clay mineral intercrystalline pores.However,the reservoir space types differ among lithofacies,mainly affected by lithology,mineral composition,and the degree of lamination development,as well as minor structural effects.Comprehensively analyzing the“four properties”of the six lithofacies of the Funing Formation,the middle and lower parts of the organic-rich laminated/layered shale are the geological sweet spots for shale oil exploration and development.

关 键 词：苏北盆地 溱潼凹陷 阜宁组 页岩油 储集空间 影响因素 油气 

分 类 号：P618.13[天文地球—矿床学]