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塔中中上奥陶统碳酸盐岩储层是在一发育良好的镶边陆棚体系中形成的礁、滩组合 ,并经过后期多次成岩和构造破裂作用改造而成。储层的储集空间类型多样 ,孔隙结构复杂 ,非均质性强。储层可划分四种类型 ,以裂缝—孔洞型和裂缝—孔隙型的储层质量最优。储层质量好坏和分布主要受沉积相类型、埋藏溶蚀作用强度和构造破裂作用强度的共同控制。运用多因素叠合概率法对本区优质储层的分布区域进行定量评价和预测表明 ,优质储层主要沿塔中I号断层上盘附近呈带状分布 ,同时在塔中 10构造带东段也有分布。
Middle-Upper Ordovician carbonate reservoirs in the Tazhong area are reefs and shoals formed in a well-developed continental shelf system and have been transformed from multiple diagenesis and tectonic rupture in the later stages. The reservoirs have various types of reservoir space, complex pore structure and strong heterogeneity. The reservoirs can be divided into four types, with the best quality of reservoirs of fracture-pore type and fracture-pore type. The quality of the reservoir and the distribution are mainly controlled by the type of sedimentary facies, the intensity of burial dissolution and the strength of tectonic rupture. The multifactor congruence probability method is used to quantitatively evaluate and predict the distribution of high-quality reservoirs in this area. The results show that the high-quality reservoirs are mainly distributed along the belt near the upper plate of Tazhong No. 1 fault. At the same time, distributed.