利用钻遇肖尔布拉克组的13口井和2条露头剖面的资料,分析了白云岩储层的宏观和微观特征,认为塔里木盆地下寒武统肖尔布拉克组主要发育9类岩性,孔隙的发育具有明显的岩相选择性,指出粉—细晶白云岩、砂屑白云岩、藻格架白云岩、泡沫绵层石白云岩、叠层石白云岩、凝块石白云岩和粘结(颗粒)白云岩是储层的主要载体.通过岩石学特征、多参数地球化学特征分析,结合地质背景,研究了肖尔布拉克组白云岩储层的成岩作用序列和孔隙演化史,明确了高能丘滩相的多孔沉积物是储层发育的物质基础,早表生期大气淡水溶蚀作用是储层形成的关键,埋藏(热液)溶蚀作用使储层得到了改善.

Based on 13 wells and 2 outcrops,the characteristics and geneisis of dolomite reservoir of the Lower Cambrian Xiaoerblak Formation in Tarim Basin are studied. It is indicated that micritic dolomite, powder-fine crystal dolomite, algal dolomite(or microbial dolomite) are the main dolomite types of Xiaoerblak Formation. The development of porosity is related to lithofacies obviously. Through the analysis of rock features and multi-parameter geochemical characteristics, and combining with the geological background, the diagenesis sequence and the pore evolution history of dolomite reservoir in Xiaoerblak Formation were studied and the main controlling factors of dolomite reservoir were proposed as follows: Porous sediments of high-energy reef-shoal(mound) facies are the material basis of reservoir development;Dissolution of metrical water in early supergene stage is the key factor to reservoir formation; In addition, burial (hydrothermal) dissolution can improve the reservoir quality.