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八面河地区沙三、沙四段砂岩经历了压实、胶结、交代、和溶蚀作用的改造。其中压实、胶结对储层有着破坏作用,而溶解作用产生的次生孔隙对储层有着改善作用。通过大量的薄片镜下观察,碳酸盐矿物的胶结、交代和溶解作用对储层的影响最为强烈。碳酸盐胶结物溶解和生物骨骼溶解形成的次生孔隙是本地区主要的孔隙发育类型。此外,岩屑和长石的溶解也是本地区重要的孔隙改善因素。垂向上看,沙三段孔隙类型主要以压实作用较弱的地方存在的原生孔隙、长石和岩屑溶解产生的次生孔隙为主,而沙四段主要以碳酸盐胶结物和生物骨骼的溶解产生的次生孔隙为主。
The sandstone of Es3 and Es4 in the Bamianhe area experienced the transformation of compaction, cementation, alteration and dissolution. Among them, compaction and cementation have a destructive effect on the reservoir, and the secondary porosity caused by the dissolution can improve the reservoir. Through a large number of thin film microscopic observations, the cementation, metasomatism and dissolution of carbonate minerals have the strongest impact on the reservoir. Secondary pores formed by the dissolution of carbonate cements and the lysis of biological skeletons are the major pore development types in this area. In addition, the dissolution of cuttings and feldspar is also an important pore improvement factor in the region. Vertically, the pore types of Es3 are dominated by primary pores, feldspar and secondary pores formed by dissolution of feldspar in the areas where compaction is weak, while the Es4 is dominated by carbonate cements and biological bones The secondary porosity generated by the dissolution of the main.