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通过岩芯及薄片的观察,结合扫描电镜、X衍射和阴极发光等资料分析,对直罗油田长8储层成岩作用及其对储层物性的影响做了研究。结果表明该研究区长8储层砂岩类型以中-细粒长石砂岩为主,碎屑颗粒以次棱角状为主,颗粒分选性好,胶结类型以孔隙-薄膜式胶结为主。研究区主要经历的成岩作用类型有压实作用、胶结作用、溶蚀作用等。整体处于晚成岩A期一晚成岩B期。压实作用、胶结作用使储集空间变小,对储层的破坏性较大,而溶蚀作用使储层物性得到一定的改善。
Through the observation of cores and thin slices, combined with the analysis of scanning electron microscopy, X-ray diffraction and cathodoluminescence, the paper studies the diagenesis of Chang 8 reservoir in Zhiluo oilfield and its influence on reservoir physical properties. The results show that the sandstone of Chang 8 reservoir in this study area is mainly medium-fine grained feldspathic sandstone, and the detrital particles are mainly sub-angular. The particles are well sorted and the type of cementation is pore-film cementation. The main diagenesis types in the study area are compaction, cementation and dissolution. The whole is in late diagenetic stage A diagenetic B stage. Compaction and cementation make the reservoir space smaller and more destructive to reservoirs, while dissolution results in a certain improvement of reservoir physical properties.