川东地腹区长兴组生物礁的主要成岩作用为泥晶化、填积、胶结、白云化和溶蚀作用。其中白云化和溶蚀作用对次生孔隙发育起控制作用。上覆致密碳酸盐岩、泥质岩类等是很好的盖层,因此,礁气藏是典型的岩性-成岩圈闭型气藏。对北部、东部的“干死型”和南部、西部的“淹死型”生物礁成岩序列也有叙述。 The major diagenesis of reefs in Changxing Formation in the belly area of ​​eastern Sichuan is that of mud mineralization, accumulation, cementation, dolomization and dissolution. Among them, dolomization and dissolution play a controlling role in secondary pore development. Overburden tight carbonate and mudstone are good cap rocks. Therefore, the reef gas reservoir is a typical lithologic-diagenetic trap gas reservoir. The “dry-dead type” in the north and the east as well as the “drowning” reef diagenesis sequences in the south and west are also described.