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研究表明,塔里木盆地雅克拉断凸内前中生界不整合面之下下奥陶统白云岩储层具以下特证:储集岩类简单,但结构较为复杂,主要有浅灰、灰黄色厚层含粒屑中-细晶白云岩,亮晶砂屑白云岩,硅质细-中晶白云岩、细-中晶残余砂屑白云岩,细晶残余鲕粒白云岩,粉-粗晶白云岩,局部有灰白色硅质岩。储层所经历的成岩作用有8种。其中,胶结作用、压实作用是使储层储集性能变差的主要成岩作用,而白云石化作用、破裂作用、溶蚀作用,特别是表生淡水溶蚀作用是产生次生孔隙的主要成岩作用。储层进油期孔隙以次生型为主,主要有晶间孔、晶间溶孔,胶结物内溶孔、溶洞、裂(溶)缝、晶间缝,孔隙度一般5％～8％,局部高达15％,故此其储集类型为孔、洞、缝复合型。储层含油气丰富,其含油饱和度高达75％,是重要的高产工业油气层。
The study shows that the Lower Ordovician dolomite reservoir beneath the unconformity surface of the former Mesozoic in the Yakela fault in the Tarim Basin is characterized by the following characteristics: the reservoirs are simple, but the structure is rather complicated with light gray and grayish yellow Fine-grained medium-fine crystalline dolomite, bright crystalline sand dolomite, siliceous fine-medium dolomite, fine-medium crystalline residual dolomite, fine-grained residual oolitic dolomite, Dolomite, with limestone locally. There are 8 diagenesis experienced by the reservoir. Among them, the cementation and compaction are the main diagenesis that make the reservoir performance worse. Dolomitization, rupture and dissolution, especially the epistatic freshwater dissolution, are the main diagenesis of secondary porosity. The pores of the reservoir into the oil-based secondary type, there are intergranular pores, intergranular dissolved pores, cement dissolved pores, karst cave, crack (soluble) cracks, intergranular cracks, the porosity is generally 5% to 8% , Some as high as 15%, so the type of reservoir for the hole, hole, seam composite type. Reservoirs rich in oil and gas, its oil saturation up to 75%, is an important high-yield industrial oil and gas layers.