摘要
川西坳陷上三叠统新场须五段岩石组合以砂夹泥、泥夹砂、砂泥岩互层为特征。通过铸体薄片、扫描电镜、CT扫描等实验方法针对泥岩储层进行研究分析,结果表明,泥页岩主要以粘土矿物和石英为主,粘土矿物主要为伊利石、绿泥石及高岭石,无水敏强烈的蒙脱石。储层空间主要为裂缝和孔隙,孔隙包括粘土矿物晶间孔隙、矿物的溶蚀孔隙、有机质孔和黄铁矿粒间孔。CT扫描显示孔隙主要分布在有机质和重矿物较发育的部位,且连通性较差。成岩作用以机械压实作用为主,使川西坳陷须五段整体较致密,原生孔隙几乎不发育。岩石成分和成岩作用使须五段致密气储层空间降低。
There are three types of the stacking pattern of T3X5 sandstone and mudstone in Xinchang area Western Sichuan depression,that is,sandstone is interbedded with t hin mudstone,mudstone is tnterbedded with sandstone,sandstone and mudstone are a lternated,the shale and mudstone are consisted of clay and quartz,and the clay is consisted of illite、chlorite and kaolinite without the water-sensitive montmorillonite,through the casting thin sections、scanning electron microscopy( SEM) and CT scan experimental methods to be studied and analysed for mudstone reservoir space. The reservoir space are consisted cracks and pore,the pore include clay mineral intercrystal pore,dissolution pore,organic pore and pyrite intergranular pore. Pore is mainly distributed in the area of organic and the heavy density mineral development according to the CT scan,and the pore is less connectivity.Diagenesis is given priority to with compaction,so,it make mudstone of the 5th member of Xujiahe Formation become density,meanwhile primary pore is almost not development. The reservoir space reduce because of rock –constituents and diagenetic in the 5th member of Xujiahe Formation.
出处
《东华理工大学学报（自然科学版）》
CAS
2015年第3期308-313,共6页
Journal of East China University of Technology(Natural Science)
关键词
川西坳陷
须五段
致密气
泥岩
储集空间
影响因素
Chuanxi depression
5th member of Xujiahe formation
Mudstone of tight gas
reservoir space
controlling factors
