四川盆地五峰组-龙马溪组有机质类型与有机孔配置的放射虫硅质页岩岩石学证据  

Mutual relation between organic matter types and pores with petrological evidence of radiolarian siliceous shale in Wufeng-Longmaxi Formation,Sichuan Basin

作　　者：周晓峰[1,2] 郭伟 李熙喆[3] 张晓伟[3] 梁萍萍[3] 于均民[1] ZHOU Xiaofeng;GUO Wei;LI Xizhe;ZHANG Xiaowei;LIANG Pingping;YU Junmin(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,Beijing 102249,China;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]油气资源与探测国家重点实验室,北京102249 [3]中国石油勘探开发研究院,北京100083

出　　处：《中国石油大学学报（自然科学版）》2022年第5期12-22,共11页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2017ZX05035004)。

摘　　要：通过氩离子抛光结合扫描电镜技术对四川盆地五峰组-龙马溪组放射虫硅质页岩有机质类型与有机孔的配置关系进行研究。结果表明:3种类型的过成熟有机质与有机孔的配置关系清晰地记录沉积有机黏粒复合体的成岩演化历程;岩化阶段,沉积有机黏粒复合体转化为干酪根黏粒复合体;低熟阶段,干酪根黏粒复合体转化为油前沥青黏粒复合体和迁移油前沥青;成熟阶段,油前沥青降解生成石油,相应地油前沥青黏粒复合体转化为固体沥青黏粒复合体,迁移油前沥青转化为固体沥青;高—过成熟阶段,有机质裂解产生湿气和干气,固体沥青黏粒复合体转化为焦沥青黏粒复合体,固体沥青化迁移油前沥青转化为焦沥青,石油也转化为焦沥青;焦沥青黏粒复合体和焦沥青化迁移油前沥青发育有机孔,即Ⅰ类和Ⅱ类有机质;焦沥青化石油缺乏有机孔,即Ⅲ类有机质;建议推广利用放射虫硅质页岩的岩石学特征研究页岩储层有机质类型和有机孔配置关系,并将有机黏粒复合体作为沉积有机质的重要赋存形式来判识原地有机质与迁移有机质。By means of argon ion polishing and scanning electron microscope technologies,the mutual relations between organic matter types and pores in radiolarian siliceous shale of Wufeng Formation-Longmaxi Formation in Sichuan Basin were studied.The results show that three types of overmature organic matter and organic matter-hosted pores clearly record the diagenetic evolution of sedimentary organic matter-clay complexes.During the solidification stage of sediment,the sedimentary organic matter-clay complexes were transformed into kerogen-clay complexes.At the low maturity stage,kerogen-clay complexes were converted to pre-oil asphalt-clay complexes and migrated pre-oil asphalt.In the mature stage,the pre-oil asphalt was degraded to produce oil,and pre-oil asphalt-clay complexes were transformed into solid asphalt-clay complexes and migrated pre-oil asphalt turned into solid asphalt accordingly.In the process of high to overmature,the organic matter was cracked to produce wet and dry gas with solid asphalt-clay complexes evolving into pyrobitumen-clay complexes and migrated solid asphalt and oil turning into pyrobitumen.Pyrobitumen-clay complexes and pyrobitumen from migrated solid asphalt have pores,and they are Type Ⅰ organic matter and Type Ⅱ organic matter in turn.Pyrobitumen from oil has no pore and becomes Type Ⅲ organic matter.It is suggested that the petrological characteristics of radiolarian siliceous shale to study the mutual relation between organic matter types and pores of shale oil and gas reservoirs and the organic matter-clay complexes should be regarded as an important occurrence of sedimentary organic matter to distinguish in-situ organic matter versus migrating organic matter.

关 键 词：放射虫硅质页岩 岩石学特征 有机质类型 有机孔 五峰组-龙马溪组 四川盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]