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在详细岩心观察描述的基础上,利用铸体薄片、扫描电镜、压汞分析、X-射线衍射、埋藏史-热史模拟等多种分析测试手段,对戴南组砂岩成岩作用特征进行了详细研究,发现砂岩储层主要经历了压实、胶结、溶蚀和交代作用,自生胶结物主要有高岭石等粘土矿物、铁碳酸盐、石英、长石及硬石膏等,发生溶蚀则主要为长石和岩屑,戴南组地层现今主要处于晚成岩的A期.戴南组砂岩储层主要受压实作用、高岭石胶结、铁碳酸盐胶结、石英次生加大及溶蚀作用的影响,发育塑性组分溶蚀成岩相和高岭石充填成岩相的储层性质往往较好,是有利的油气储集带;而发育压实-充填成岩相和碳酸盐胶结成岩相的储层孔渗性能很差,多为致密储层.
Based on the detailed description of core observation, the diagenesis characteristics of sandstone in Dainan Formation are described in detail by means of various analysis and testing methods such as cast thin film, SEM, mercury intrusion analysis, X-ray diffraction, burial history-thermal history simulation The results show that sandstone reservoirs mainly experienced compaction, cementation, dissolution and metasomatism. There are mainly kaolinite and other clay minerals, iron carbonate, quartz, feldspar and anhydrite, etc., Feldspar and cuttings, the Dainan Formation is now predominantly late-diagenetic stage A. The sandstone reservoir in the Dainan Formation is mainly subjected to compaction, kaolinite cementation, iron-carbonate cementation, quartz secondary enrichment and dissolution The reservoirs that developed plastic component eroded diagenetic facies and kaolinite-filled diagenetic facies tend to be good and favorable oil and gas reservoirs. However, the developmental compaction-filled reservoirs filled with diagenetic facies and carbonates into diagenetic facies Porous permeability is poor, mostly tight reservoirs.