摘要
通过薄片鉴定、扫描电镜以及岩石物性分析等方法,对内蒙古林西地区晚二叠世林西组碎屑岩成岩作用及其对储层物性的影响进行了系统研究,结果表明该地区林西组地层碎屑岩成岩作用主要为压实作用、胶结作用、交代作用及溶蚀作用。砂岩胶结物主要为黏土矿物、硅质矿物及碳酸盐矿物3种,其中黏土胶结物出现最多,以伊利石为主,绿泥石次之;碳酸盐胶结物以方解石为主;硅质胶结主要表现为石英次生加大和自生微晶石英。有机质镜质体反射率(Ro)、泥岩伊利石/蒙皂石(I/S)中的S(%)含量、石英次生加大级别、颗粒接触类型、伊利石结晶度等多项数据指标显示林西地区林西组碎屑岩处于晚成岩阶段。储层物性与成岩作用密切相关,压实作用、胶结作用使储层孔隙度和渗透率降低;溶蚀作用使储层孔隙度提高。
Through the methods of rock slide identification,SEM,petro-physical analysis,clastic diagenesis and its influence on physical properties in the Late Permian Linxi Formation in Linxi area,Inner Mongolia have been systematically studied.The results show that clasolite diagenesis in this area has experienced compaction,cementation,metasomatism and dissolution.The three types of sandstone cements are argillaceous,siliceous and carbonate cements.Argillaceous cement appears the most and mainly composed of illite,the second is chlorite.Carbonate cement is mainly calcite.The main ingredient of siliceous cement are quartz secondary enlargement and authigenic quartz microlite.Vitrinite reflectance（Ro）,content of S% in mudstone illite/smectite（I/S）,quartz secondary enlargement level,particle contact type,illite crystallinity and some other data show that Linxi Formation clastic rocks in Linxi area is in the late diagenetic stages.The physical properties of reservoir is closely related to diagenesis.Compaction and cementation make porosity and permeability in Linxi area lower,while dissolution makes porosity higher.
作者
禚志博
朱占平
丁歌
金凤兰
任泽宁
ZHUO Zhi-bo ZHU Zhan-ping DING Ge JIN Feng-lan REN Ze-ning(College of Earth Sciences, Jilin University, Changchun 130061, China)
出处
《世界地质》
CAS
2016年第4期1058-1065,共8页
World Geology
基金
国土资源部地质调查局<索伦-林西地区油气资源选区调查>(1211302108019)资助
关键词
内蒙古
林西地区
林西组
成岩作用
Inner Mongdia
Linxi area
Linxi Formation
clasolite diagenesis
