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利用铸体薄片、扫描电镜、X射线衍射分析,对延气2井区盒8段储层成岩作用特征及对孔隙演化的影响进行了研究。研究表明砂岩类型主要以岩屑石英砂岩和岩屑砂岩为主;压实作用和胶结作用强烈破坏了砂岩的原生孔隙,是造成盒8储层孔隙度丧失的主要因素;压实作用造成21.32%的原生孔隙度损失,胶结作使15.97%的原生孔隙度丧失,溶蚀作用则形成大量次生孔隙,增加了2.28%的孔隙度。
The characteristics of diagenesis and the influence on the evolution of the pores in the 8th member of Well Yan 8 in Well B 3 were studied by means of thin cast film, scanning electron microscopy and X-ray diffraction analysis. The study shows that the sandstone types are mainly lithic quartz sandstone and lithic sandstone. The compaction and cementation strongly destroy the primary porosity of sandstone, which is the main factor of the porosity loss of box 8 reservoir. The compaction results in 21.32% Of the original porosity loss, cementation make 15.97% of the loss of primary porosity, dissolution of the formation of a large number of secondary pores, an increase of 2.28% porosity.