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南盘江坳陷经历了多期构造变形,古生界发育齐全,出露完整,具有多种沉积类型。按照岩石结构划分,该区存在有结构残余的白云岩、无结构残余的白云岩、强烈交代的白云岩、含(泥)硅白云岩及渗滤砂白云岩五类。该区白云岩有两种成因,其一为呈薄层状分布于深水盆地薄层泥灰岩或泥岩、硅质岩中的白云岩,1δ3C、1δ8O较高,系深埋藏白云石化产物;其二为分布于浅水碳酸盐岩台地和台地边缘礁中的白云岩,1δ3C、1δ8O较低,系混合水白云岩化的结果。
Nanpanjiang Depression experienced multiple tectonic deformation, complete development of Paleozoic, exposed complete, with a variety of sedimentary types. According to the rock structure, there are five types of residual dolomite, unconsolidated dolomite, intensely interpreted dolomite, silt-bearing dolomite and percolation sand dolomite. There are two causes of dolomite in this area. One is dolomite with thin layer of lamellar marl or mudstone and siliceous rock in the deep-water basin, with high 1δ3C and 1δ8O, which are deeply buried dolomitization products; The second is dolomite distributed in shallow reef carbonate platform and platform margin reefs. The results show that 1δ3C and 1δ8O are lower than dolomitization of mixed water.