四川盆地复兴地区下侏罗统页岩油气富集高产主控因素  

Main controlling factors for high yield and enrichment of shale oil and gas in the Lower Jurassic in the Fuxing area of Sichuan Basin

作　　者：舒逸 郑有恒[2] 包汉勇[1] 徐尚 刘皓天[1] 陈绵琨[1] 彭伟[1] 张梦吟 肖雄[1] SHU Yi;ZHENG Youheng;BAO Hanyong;XU Shang;LIU Haotian;CHEN Miankun;PENG Wei;ZHANG Mengyin;XIAO Xiong(Exploration and Development Research Institute of Jianghan Oilfield Branch of China Petroleum and Chemical Corporation,Wuhan,Hubei 430223,China;Jianghan Oilfield Branch of China Petroleum and Chemical Corporation,Qianjiang,Hubei 433124,China;National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油化工股份有限公司江汉油田分公司勘探开发研究院,湖北武汉430223 [2]中国石油化工股份有限公司江汉油田分公司,湖北潜江433124 [3]深层油气全国重点实验室(中国石油大学(华东)),山东青岛266580

出　　处：《世界石油工业》2023年第5期26-38,共13页World Petroleum Industry

基　　金：中国石油化工股份有限公司“十条龙”科研项目“复兴侏罗系陆相页岩油气藏地质评价技术”(P21078-2);自然科学基金优秀青年科学基金项目(42122017)。

摘　　要：四川盆地复兴地区下侏罗统发育多套富有机质页岩,多口井获得高产工业油气流,证实了侏罗系陆相页岩油气有较大的勘探开发潜力,但页岩油气富集高产主控因素尚不清晰。以川东侏罗系东岳庙段和凉高山组页岩为研究对象,开展页岩岩石矿物、沉积地化、储集性及含油气性等方面的研究工作。结果表明:(1)有2套页岩整体形成于半深湖环境,TOC平均值分别为1.41%和1.77%,以Ⅱ_(1)和Ⅱ_(2)型干酪根为主,Ro平均值分别为1.33%和1.56%,处于凝析油-湿气阶段;(2)无机孔隙(黏土矿物粒间孔等)是主要的储集空间,介孔和宏孔占比较高,孔隙连通性较好;(3)页岩黏土矿物含量较高(平均值大于50%),总体可压性较差,其中凉二下亚段页岩的脆性矿物含量较高、可压性较好;(4)研究区下侏罗统页岩油气富集高产主要受控于优质页岩良好的孔缝结构、中—高热演化程度和较好的保存条件;(5)研究区页岩油气具有富介壳隔层的强超压封闭型和富砂岩夹层的弱超压半封闭型2种成藏模式。研究为中国陆相页岩油气高效勘探开发提供理论依据和技术支撑。Multiple sets of organic rich shale have been developed in the Lower Jurassic of the Fuxing area of the Sichuan Basin,and multiple wells have obtained high production of industrial oil and gas.This confirms that the Jurassic continental shale has great exploration and development potential,but the main controlling factors for shale oil and gas enrichment and high production are still unclear.It is focused and studied on the shale of the Dongyuemiao formation and Lianggaoshan formation of the Jurassic in eastern Sichuan,and conducts research on shale rock minerals,sedimentary geochemistry,reservoir properties,compressibility,and oil and gas bearing properties.The results show that:(1)the two sets of shale were formed in a semi deep lake environment as a whole,with average TOC values of 1.41%and 1.77%,respectively.They are mainly composed of type Ⅱ_(1) and Ⅱ_(2) kerogen,with average Ro values of 1.33%and 1.56%,respectively,and are in the condensate wet gas stage;(2)Inorganic pores(such as clay mineral intergranular pores)are the main storage space,with a high proportion of mesopores and macropores,and good pore connectivity;(3)The shale clay mineral content is relatively high(with an average value greater than 50%),and the overall com-pressibility is poor.Among them,the brittle mineral content of the shale in the lower segment of Liang'er is relatively high,and the compressibility is good;(4)The enrichment and high production of oil and gas in the Lower Jurassic shale in the research area are mainly controlled by the good pore and fracture structure of high-quality shale,the degree of medium to high thermal evolu-tion,and good preservation conditions;(5)The shale oil and gas in the study area have two reservoir formation modes:a strong overpressure sealing type with rich crust interlayer and a weak overpressure semi sealing type with rich sandstone interlayer.This study provides theoretical basis and technical support for the efficient exploration and development of continental shale oil and gas in China.

关 键 词：陆相页岩油气 侏罗系页岩 成藏富集 主控因素 四川盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]