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成岩作用研究表明，戴南组二段成岩作用类型主要有机械压实、胶结、交代、溶解、粘土矿物充填等，并进行了各成岩作用对孔隙改造规模的统计。成岩作用阶段的划分，采纳了中华人民共和国石油天然气行业标准，将戴南组二段划分为早成岩Ｂ期和晚成岩Ａ期两个阶段。次生孔隙的发育、分布与泥岩压实曲线的紧密压实、大量脱水阶段或有机质的成熟阶段、生油门限以及混层粘土的第一迅速转化带有着密切联系，从而成为次生孔隙预测的着眼点。
Diagenesis studies show that diagenesis types of the second member of the Dainan Formation mainly include mechanical compaction, cementation, metasomatism, dissolution, clay mineral filling, and the statistics of the scale of pore reformation by diagenesis. Diagenesis stage of the division, the People’s Republic of China adopted the oil and gas industry standards, the second section of the Dainan Formation is divided into B and late diagenetic A phase A two stages. Secondary pore development and distribution are closely related to the tight compaction of the mudstone compaction curve, the mass dehydration stage or the maturity stage of organic matter, the oil production threshold and the first rapid transformation of mixed clay so that it becomes the secondary pore prediction Focus.