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塔中地区石炭系碳酸盐岩主要岩类为颗粒灰（云）岩和泥粉晶白云岩。成岩作用包括胶结作用、准同生白云石化作用、溶解作用、压实－压溶作用、膏盐化及去膏盐化作用。颗粒灰岩储集空间以晚期鲕压裂孔、深埋溶蚀孔、洞及压溶缝组合为特征；白云岩形成粒内溶孔（含铸模孔）－晶间溶孔储集空间组合。测试资料表明，泥粉晶白云岩为大孔粗－中喉型高孔高渗的Ⅰ类好储层；颗粒白云岩为中孔细喉型高（中）孔低渗的Ⅱ类中等储层；颗粒灰岩为小孔极细喉型低孔低渗的Ⅲ类差－非储层。横向上，在东部ＴＺ４井区和ＴＺ６井区，Ｉ，Ⅱ类白云岩储层与Ⅲ类灰岩储层呈２～４ｍ的互层；西部ＴＺ１０井区则以Ⅲ类灰岩储层为主。
The main carbonates of Carboniferous carbonate rocks in Tazhong area are granular ash (cloud) and muddy dolomite. Diagenesis includes cementation, quasi-syngenetic dolomitization, dissolution, compaction-depressurization, salinization and de-salination. Particulate limestone reservoir space is characterized by late oolitic fissure pores, deep-buried erosion pores, pores and pressure-dissolving seam assemblages, and dolostones form intragranular dissolution pores (including mold pores) -intergranular dissolution reservoir space combinations. The test data show that the mud powder dolomite is a type I good reservoir with macropore coarse-mesoporous high porosity and permeability, and the particle dolomite is a moderate type Ⅱ medium reservoir with mesopore thin-throat type high (middle) porosity and low permeability The grain limestone is a type Ⅲ poor-non-reservoir with very fine pore and low porosity and low permeability. Laterally, in the eastern TZ4 well and TZ6 well, type I and II dolomite reservoirs are interbedded with class III limestone reservoirs 2-4 m thick; type III limestone reservoirs are predominant in the western TZ10 well .