塔里木盆地阿克库勒地区石炭系卡拉沙依组成岩作用

阿克库勒地区卡拉沙依组碎屑岩储层的成分成熟度和结构成熟度均较低．储层的次生溶蚀孔隙所占比例远高了：原生孔隙，次生孔隙是储层的主要储集空间．样品数据统计显示，卡拉沙依组储层属于低孔、低渗储层类型．根据岩石薄片、铸体薄片观察及储层样品的扫描电镜和阴极发光分析结果，本区石炭系储层主要经历的成岩作用有压实（压溶）作用、胶结作用、溶蚀作用和交代作用，其中碳酸盐矿物的沉淀和溶蚀作用是本区卡拉沙依组储层所经历的最重要的成岩作用．成岩作用已达到晚成岩B期，早期方解石交代石英颗粒并发生大量溶蚀，生成大量次生孔隙，晚期方解石没有发生溶蚀．

DIAGENESIS OF KALASHAYI FORMATION, CARBONIFEROUS, AKEKULE AREA, TARIM BASIN

In Akekule area, the maturity of component and texture of the clastic rock reservoir in Kalashayi formation are relatively low. Amount of secondary pore space is far more than primary pore space. Secondary pore space is the main reservoir pore space. Statistic of sample data identify that the reservoir has low porosity and low permeability. The analysis of thin sections of core and cast core scanning-electron microscope and cathodoluminescence shows that the diagensis of clastic rock reservoir in Kalashayi formation has developed into the later stage of diagenesis B period, and mainly sonsists of several types of diagensis which include compaction, cementation, dissolution and replacement. The cementation and dissolution of carbonate are the most important type of diagensis occurred in Kalashayi formation in the studied area.