恰什古伊气田是中亚管线的核心供气气田之一，受早期恰什古伊地区钻井成功率低及取心收获率低的影响，其储层特征不明确，这给该区的勘探评价与开发工作造成了较大困难。 利用目的层段的系统岩心资料，开展了岩心观察、铸体薄片鉴定、岩心物性和孔隙结构分析等实验，在结合前人研究成果的基础上，对该气田主要层段的储层特征进行了研究。 结果表明：恰什古伊地区储层的储集性能主要表现为中— 低孔、低渗，储层孔喉组合以中、小孔-小喉组合为主。 通过综合评价，将区块内储层分为 3 级，并研究了各级储层特征，同时发现区块的岩石类型、沉积微相和成岩作用对储层发育影响显著。 该研究可为恰什古伊气田的进一步评价提供坚实的基础，同时也为气田周边的滚动勘探与开发提供借鉴。

Chashgui Gas Field is one of the gas fields supplying gas to the Central Asia Natural Gas Pipeline. Limited by the low coring recovery rate and low drilling success ratio in early period, the reservoir characteristics of Callovian Oxfordian in Chashgui area is unclear, which causes difficulty in exploration evaluation and gas field development. Based on petrology analysis of the core data, slice arbitration, core physical property and pore structure, and combined with the previous achievements, this paper studied the characteristics of Callovian-Oxfordian reservoir in Chashgui Gas Field. The result shows that the reservoir property is middle to low porosity and low permeability, and the reservoir is mainly of middle to small pore and small throat. The reservoir in this area was divided into 3 types, and the characteristics of each type of reservoir were studied. The rock type, sedimentary facies and diagenesis have important effect on the reservoir development. These recognitions can provide basis for the evaluation and development of the gas field, and provide reference for the progressive exploration in surrounding area.