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库车坳陷中新生界以陆相碎屑建造为主，在该区储层砂岩中，钠长石为广泛存在的自生矿物之一。显微结构证据显示，成岩期钠长石交代长石等碎屑，或呈细小自形晶填隙产出；在化学成份上，钠长石与被交代的长石存在过渡关系。在碎屑长石钠长石化过程中，母体相的溶解速率大于钠长石的沉淀速率，并伴有石英、高岭石等矿物的消耗，因此有助于次生孔隙的发育及储层物性的改善。从高岭石的垂向分布，以及钠长石相对含量与埋深的关系，可以看出钠长石化作用主要发生在深成岩带（ ｍｅｓｏｄｉａｇｅｎｅｓｉｓ） ，对应于４ ０００ ～５ ５００ｍ 埋深，和９０ ℃～１１０ ℃地温带。在库车和塔北地区，主要工业油气藏亦集中分布在这一深度带。
The Mesozoic-Cenozoic Kuqa Depression was mainly composed of continental debris. Among the reservoir sandstones in this area, albite is one of the most widely distributed authigenic minerals. Microstructural evidence shows albite albite dating feldspar and other debris, or small self crystal filling gap; in chemical composition, albite and was confined feldspar transitional relationship. During the feldspathic feldspars, the rate of dissolution of the parent phase is greater than the precipitation rate of albite and is accompanied by the depletion of minerals such as quartz and kaolinite, thus contributing to the development of secondary pores and reservoir physical properties Improvement. From the vertical distribution of kaolinite and the relationship between relative abundance and burial depth of albite, it can be seen that the lithofacies mainly occurs in the mesodiagenesis, which corresponds to a buried depth of 4 000-5 500 m and a temperature of 90 ℃ ~ 110 ℃ geothermal zone. In Kuche and Tabei areas, the major industrial reservoirs are also concentrated in this depth zone.