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依据碳酸盐岩的颗粒组分及结构构造特点,四川广安谢家槽剖面下三叠统夜郎组和嘉陵江组的碳酸盐岩可以划分出5个主要的微相类型和15个次一级的微相类型。在微相分析的基础上,结合岩性及构造特点,划分出台地边缘、开放海台地、局限海台地和蒸发台地4种主要的沉积相带,由夜郎组、嘉陵江组向上到雷口坡组构成从局限海台地逐渐演变为蒸发台地相,反映了该地区从早三叠世到中三叠世海水逐渐变浅、碳酸盐台地逐渐向蒸发台地总的演变历程。
Based on the grain composition and structural features of carbonate rocks, the carbonate rocks in the Triassic Yelang and Triassic Jialingjiang formations in the Xiejiacao Section of Guang’an, Sichuan Province can be divided into five major microfacies types and 15 sub-types Micro-phase type. On the basis of the micro-facies analysis, combining with lithology and structural features, the four major sedimentary facies belts such as the margin of the platform, the open sea platform, the limited sea platform and the evaporating platform are divided. From the Yelang and Jialingjiang formations, The composition of the group gradually evolved from the localized plateau to the evaporite platform, reflecting the gradual evolution of the carbonate platform to the evaporating platform from the Early Triassic to the Middle Triassic.