摘要
为查明四川盆地复兴地区侏罗系页岩成熟度及有机质孔隙发育特征,通过镜质体反射率、拉曼光谱、岩石热解多手段联合确定成熟度,同时采用光学显微镜和聚焦离子束扫描电镜相结合的方法,初步分析了不同显微组分有机质孔隙发育特征。研究结果表明:复兴地区凉二段和东岳庙段页岩均处于高成熟热裂解生湿气阶段(1.2%<R o<2.0%);凉二段页岩因埋深较浅成熟度略低,整体在1.25%~1.5%;东岳庙段页岩成熟度相对较高,整体在1.6%~1.8%。有机显微组分以镜质体为主,其次为惰性组和固体沥青,干酪根类型以Ⅱ2型和Ⅲ型为主。主要发育4种类型的有机质孔,即固体沥青孔隙、镜质体孔、惰质组孔和生物碎屑孔。有机质孔隙以固体沥青孔为主,镜质体和惰质组内部多均质致密,极少发育孔隙,部分细胞腔被固体沥青、黏土矿物或黄铁矿充填,形成少量孔隙;生物碎屑内部可见微孔,矿物边缘发育絮状有机质孔。有机显微组分类型及含量是控制复兴地区侏罗系页岩有机质孔隙发育的关键。
The thermal maturity of Jurassic continental in Fuxing area,Sichuan Basin were studied through a combination of vitrinite reflectance,Raman spectroscopy,and rock pyrolysis.The pore development characteristics of different macerals of organic matter are preliminarily analyzed through a combination of optical microscopy and focused ion beam scanning electron microscopy.The research results indicate that both the shales in the second member of Lianggaoshan Formation and Dongyuemiao member in the Fuxing area are in the stage of high maturity pyrolysis(1.2%<R o<2.0%);The maturity of the shale in the second member of Lianggaoshan Formation is 1.25%~1.50%because of its shallow burial depth;The maturity of shale in the Dongyue member is relatively high,ranging from 1.6%to 1.8%overall.Vitrinite is the main component of organic matter,followed by inertinite and solid asphalt.Four types of organic matter pores are mainly developed in the study area,namely solid asphalt pores,vitrinite pores,inertinite pores and suspected bioclastic pores.Solid asphalt pores are the main ones.Vitrinite and inertinite are mostly homogeneous and dense,with few pores developed.Some cell cavities in organic matter are filled with solid asphalt,clay minerals or pyrite,and a small amount of organic matter pores are formed inside.There are a large number of apatite microcrystals in the organic mudstone,which are suspected of bioclastic.Micropores can be seen inside,and flocculent organic pores are developed on the edge of the mineral.The type and content of organic macerals are the key to control the development of organic matter pores in Jurassic shale in Fuxing area.
作者
周圆圆
芮晓庆
鲍芳
俞凌杰
张庆珍
席斌斌
ZHOU Yuanyuan;RUI Xiaoqing;BAO Fang;YU Lingjie;ZHANG Qingzhen;XI Binbin(Wuxi Research Institute of Petroleum Geology,Sinopec Petroleum Exploration&Production Research Institute,Wuxi,Jiangsu 214000,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi,Jiangsu 214000,China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2023年第3期27-37,80,共12页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金企业创新发展联合基金“海相深层油气富集机理与关键工程技术基础研究”子专题“深层页岩热成熟度、储集系统与页岩气保存机理研究”(U19B6003-03-06)。
