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根据铸体薄片及物性资料分析,对安塞油田东部地区延长组长2-长6油层储层的岩石学特征、物性特征等进行深入研究,分析影响储层储集性能的主要因素。结果表明,研究区的长2-长6储层岩石类型以细粒长石砂岩为主,具成分成熟度低而结构成熟度高的岩石学特点,储层以粒间孔和溶蚀孔最为发育,溶解作用是形成次生孔隙,改善本区储层储渗条件的主要成岩方式之一。储层的储集性受沉积相和成岩作用综合控制,为典型中低孔、特低渗储集层。
Based on the analysis of cast thin slice and physical property data, the petrologic characteristics and physical properties of 2 to 6 oil reservoirs of Yanchang Formation in the east of Ansai Oilfield are deeply studied, and the main factors affecting the reservoir performance are analyzed. The results show that the lithology of Chang 2 to Chang 6 reservoir in the study area is dominated by fine-grained feldspathic sandstone with low maturity and high structural maturity, and the intergranular and dissolved pores are the most developed in the reservoir The dissolution is one of the main diagenesis ways to form secondary pores and improve the conditions of reservoir permeability and permeability of the reservoir. The reservoirs are controlled by sedimentary facies and diagenesis, and are typical low-porosity and ultra-low permeability reservoirs.