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塔中地区石炭系碎屑岩为一套次生─原生孔隙型深埋藏优质储层。储集岩为中细粒─细粒石英砂岩，储层形成于古地温梯度低、沉积物浅埋时间长、深埋时间短、孔隙水矿化度高及较早被油气占居的条件下，致使原生孔隙保存较好。同时，塔中地区石炭系目前刚进入８０℃─１２０℃的强溶成岩阶段，次生孔隙正在发育，距离碳酸盐岩沉淀带和后期石英次生加大带尚有较大深度，因而储层的孔渗性维持在最佳状态。
Carboniferous clastic rocks in Tazhong area are a set of secondary-primary pore-type deep-buried high-quality reservoirs. The reservoir rocks are fine-grained-fine quartz sandstones. The reservoirs were formed under the conditions of low paleogeothermal gradients, shallow sedimentation time, short buried time, high salinity of pore water and earlier occupation of oil and gas , Resulting in better preservation of native pores. At the same time, the Carboniferous in Tazhong area has just entered the strong diagenesis stage of 80 ℃ -20 ℃, the secondary pores are developing, there is a greater depth from the carbonate sedimentation zone and the secondary quartz addition zone, The porosity of the layer is maintained at its optimum.