上奥陶统碳酸盐岩储层是和田河气田主要产气层之一。储层储渗空间以次生成因的孔、洞、缝为主。该套储层是在4亿年左右的地质历史中，由沉积、成岩和构造作用相互影响而形成的最终成果：其中沉积作用是基础，影响着储层的基本形态，有利于储层形成与演化的沉积相为台地边缘滩、台内点滩和上斜坡等沉积相带；成岩作用是关键，决定了储层的最终分布形态和范围，对储层结构的影响至关重要，促进储集空间形成的成岩作用主要有表生期和埋藏期的溶解作用；构造作用是条件，影响着各储集体之间以及单一储集体内部储集空间的连通情况。%The carbonate reservoir of Upper Ordovician is one of the major gas producing formations in Hetian River gas field and its storage-permeability rooms are mainly composed of secondary pores, vugs and fractures. This reservoir occurred as an ultimate result of the compound influences of sedimentation, diagenesis and tectonism on it in about four hundred million years past. The sedimentation is the foundation, affecting the basic pattern of the reservoir,and the sedimentary facies zones beneficial to the formation and evolution of the reservoir includes platform edge bank facies, introplatform point beach facies and acclivity sedimentary facies, etc.; the diagenesis is the key factor, determining the pattern and scope of the final distribution of the reservoir and being of great influence on reservoir structure, and the diagenesis of promoting the formation of storage rooms is mainly the dissolution occurred during hypergene stage and burial stage;and the tectonism is the condition of influencing the connectivity among various reservoir bodies and among the storage rooms within a single reservoir body.
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