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鄯勒低渗透油气藏储层物性差,纵向上存在2个次生孔隙发育带,对应于西山窑组二段和三工河组油层。次生孔隙发育带钾长石溶蚀强烈,自生高岭石很发育,相对含量大于25%,以蠕虫状和书页状分布于骨架颗粒间。大量自生高岭石发育所需的开放—半开放流体体系同时也有利于油气富集。根据成岩作用特点及储层孔隙演化特征,对西山窑组二段储层划分了3种成岩—储集相,评价了不同成岩作用相互作用下的次生孔隙发育的程度。此外,沉积条件决定了砂体原始物性的好坏,后期构造作用形成的裂缝又有效地改善了储层物性,三者共同控制了研究区油气的富集程度,是鄯勒地区西山窑组背斜型油藏的储油机理。
There are two secondary porosity development zones in the longitudinal direction in Jule gas reservoir with low permeability, corresponding to the second member of Xishanyao Formation and the Sankonghe Formation reservoir. K-feldspar developed strongly in secondary pore development. The authigenic kaolinite is well developed with the relative content of more than 25%, distributed in the form of worms and book pages between the skeleton grains. The open-semi-open fluid system required for the mass spontaneous kaolinite development is also conducive to hydrocarbon enrichment. According to the characteristics of diagenesis and the evolution of reservoir porosity, three diagenetic-reservoirs are divided into the second member of Xishanyao Formation, and the degree of secondary pore development under different diagenesis interaction is evaluated. In addition, the sedimentary conditions determine the original physical properties of the sand body, and the fractures formed in the later tectonics have effectively improved the reservoir physical properties. The three jointly control the degree of oil and gas accumulation in the study area, Oblique reservoir oil storage mechanism.