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通过野外砂体建模、钻井岩芯与测井沉积相研究、井间储层对比等,认为克拉2气田砂岩储层是一套厚度大、分布广、物性好、连续性好和隔夹层少的优质天然气储层.根据大量的岩石薄片、铸体薄片、孔渗物性和压汞参数等资料,进行了储层成岩作用、控制因素及孔隙形成机理与演化的研究认为浅埋藏时期的压实作用和成岩过程中的白云石和方解石胶结物对储层物性下降起了重要作用,现今压实作用以中～弱为主,物性较好的储层段无或含较少方解石胶结物;深埋藏早期仍以剩余原生粒间孔为主,但因溶蚀作用而出现了部分改造扩大的次生粒间孔,储层段的自生高岭石是长石和岩屑溶蚀的产物;深埋藏晚期的构造裂缝和异常高压背景有利于改善和保存这些孔隙。
Sandstone reservoir in Kela-2 gas field is considered as a set of sandstone reservoirs with large thickness, wide distribution, good physical properties, good continuity and less intercalation through field sand body modeling, drilling core and well log sedimentary facies and reservoir comparison between wells. Based on a large number of rock slices, cast films, porosity and permeability parameters and mercury intrusion parameters of reservoir diagenesis, control factors and pore formation mechanism and evolution of the study believe that shallow burial compaction Dolomite and calcite cements in the process of diagenesis and calcite play an important role in the physical property reduction of the reservoir. Nowadays, the compaction is mainly medium or weak with good physical properties without or with less calcite cement; In the early stage, however, the remaining primary intergranular pores were still dominant, but some secondary intergranular pores that were altered and enlarged due to dissolution appeared. The authigenic kaolinite from the reservoir was the product of feldspar and lithic dissolution. Cracks and abnormal high pressure background help to improve and preserve these pores.