川东北地区自流井组页岩有机地球化学特征及油气勘探意义  

Organic geochemical characteristics of Ziliujing Formation shales in northeastern Sichuan and its significance for oil and gas exploration

作　　者：刘忠宝 李鹏[1,3] 刘光祥 李雄[4] 刘晧天[4] 王鹏威[3] 郝景宇 李倩文 LIU Zhongbao;LI Peng;LIU Guangxiang;LI Xiong;LIU Haotian;WANG Pengwei;HAO Jingyu;LI Qianwen(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development,Beijing 100083,China;Key Laboratory of Shale Oil/Gas Exploration and Production,SINOPEC,Beijing 100083,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;Exploration and Development Research Institute of Jianghan Oilfield Company,SINOPEC,Wuhan 430223,China;Exploration Company of SINOPEC,Chengdu 610041,China)

机构地区：[1]页岩油气富集机理与高效开发全国重点实验室,北京100083 [2]中国石化页岩油气勘探开发重点实验室,北京100083 [3]中国石化石油勘探开发研究院,北京100083 [4]中国石化江汉油田分公司勘探开发研究院,武汉430223 [5]中国石化勘探分公司,成都610041

出　　处：《世界地质》2023年第1期69-79,共11页World Geology

基　　金：国家科技重大专项(2017ZX05036004);中国石化科技部项目(P19017-2)联合资助。

摘　　要：为查明陆相页岩烃源特征及生油气潜力,采用有机碳含量(TOC)、镜质体反射率(Ro)、有机岩石学、干酪根碳同位素及族组分碳同位素测定等多种测试方法,开展川东北不同地区自流井组页岩有机地球化学特征及对比研究,明确主要地化参数特征及差异,并重点探讨有机质类型的研究对页岩油气勘探的意义。研究结果表明:自流井组东岳庙段与大安寨段页岩w(TOC)主要介于0.5%~2.0%,平均值>1.2%,有机显微组分以镜质体、丝质体为主,其次为固体沥青及微粒体,Ⅱ1、Ⅱ2及Ⅲ型有机质均有发育,以Ⅱ2型为主,有机质处于成熟-高成熟阶段,具备较好的页岩油气勘探潜力;川东涪陵地区东岳庙段东一亚段页岩有机质类型纵向上频繁变化,向上东二亚段—东三亚段页岩干酪根碳同位素存在倒转变轻现象,推测与运移烃混入有关,并提出页岩层段纵向上有机质类型变化的精细确定,有助于判识不同层段生烃能力与有机质孔发育程度的差异。In order to find out the hydrocarbon source characteristics and hydrocarbon generation potential of continental shales,the organic geochemical characteristics and comparative studies of the Ziliujing Formation shales in different areas of northeastern Sichuan were carried out by using a variety of testing methods,such as total organic carbon(TOC)content,vitrinite reflectance(R o),organic petrology,kerogen carbon isotope and group component carbon isotope determination.The characteristics and differences of main geochemical parameters were clarified,while the significance of the study of organic matter types for shale oil and gas exploration was discussed.The results show that the w(TOC)of the shales in Dongyuemiao and Da anzhai members of Ziliujing Formation is mainly between 0.5%and 2.0%,with an average of more than 1.2%.The organic macerals are mainly vitrinite and filamentite,followed by solid asphalt and microsome.TypeⅡ1,typeⅡ2 and typeⅢorganic matter are developed,mainly typeⅡ2.The organic matter is in the mature to highly mature stage,with good shale oil and gas exploration potential.The type of organic matter of the Dong 1 sub-member in the Fuling area,eastern Sichuan,changes frequently in the vertical direction,and there is a slight reverse transformation of carbon isotope of kerogen of the shales of the Dong 2 and Dong 3 sub-members.It is speculated that this phenomenon is related to the migration of hydrocarbon.Meanwhile,it is proposed that the precise determination of the change of organic matter type in the vertical direction of the shale interval is helpful to identify the differences of hydrocarbon generation capacity and organic matter pore development in different intervals.

关 键 词：页岩油气 有机质类型 干酪根碳同位素 东岳庙段 大安寨段 自流井组 川东北 

分 类 号：P618.13[天文地球—矿床学]