塔里木盆地寒武系发育规模巨大的白云岩地层.对覆盖区钻孔岩心的岩石学分析表明,塔里木盆地寒武系白云岩成因主要有六种:潮坪相沉积成因、潟湖相沉积成因、渗透回流交代成因、压实排挤流交代成因、岩溶低温结晶成因和岩溶高温结晶成因.岩心物性分析与铸体薄片分析结果表明,岩溶低温结晶成因白云岩本质上可成为最优质的白云岩储层,储层特征为高孔高渗;湖坪沉积成因与岩溶高温结晶成因白云岩可形成高孔低渗的白云岩储层;潟湖相沉积成因白云岩、渗透回流交代成因白云岩与压实排挤流交代白云岩一般不作为优质的白云岩储层.

Thick Cambrian dolostone strata are distributed in Tarim basin. The petrology analysis of the drilled cores from the rock shows that the Cambrian dolostone can be divided into six types of genesis: tidal flat sedimentary dolostone (TSD), lagoon sedimentary dolostone (LSD), permeability-reflux secondary dolostone (PRSD), campacting fluid secondary dolostone (CFSD), secondary dolostone crystallized in burial karstification under low temperature (BKLTSD), and hydrothermal fluid secondary dolostone (HFSD). Based on the analysis of physical property from the cores and thin sections, it is shown that BKLTSD could be the best high-porous and high-permeable reservoir, TSD and HFSD could be high-porous and low-permeable reservoir and the others could not be good reservoirs in Tarim basin.