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利用岩石铸体薄片鉴定、阴极发光分析和扫描电镜分析等多种测试手段,对鄂尔多斯盆地姬塬地区长8油层组储层砂岩的岩石学特征、物性特征和成岩作用进行了分析。结果表明,该储集岩以长石岩屑砂岩和岩屑长石砂岩为主,成分成熟度和结构成熟度都较低,Q1/(F1+R1)平均值均小于0.8;储层岩石中的长石在成岩流体和大气淡水的共同作用下发生了较强的溶蚀作用,在被溶蚀的长石边缘和孔隙中存在大量粘土矿物、自生石英和方解石,并且孔隙比较发育。这些长石溶解物质对储层物性有着不同程度的影响,其中自生高岭石和自生石英显示了对孔隙生成和保护方面的积极作用,而自生碳酸盐和自生伊利石主要表现为对孔隙生成和保护方面的消极作用。
The petrographic characteristics, petrophysical characteristics and diagenesis of reservoir sandstones in Chang 8 reservoir in Jiyuan area, Ordos Basin, are analyzed by means of thin film identification, cathodoluminescence analysis and scanning electron microscope analysis. The results show that the reservoir rocks mainly consist of feldspathic lithic sandstones and lithic feldspathic sandstones, with low maturity and structural maturity, and the average values of Q1 / (F1 + R1) are all less than 0.8. Feldspar has a strong dissolution effect under the combined action of diagenetic fluid and atmospheric fresh water. There are a large amount of clay minerals, self-quartz and calcite in the feldspar and pores of the dissolution, and the pores are relatively developed. These feldspar dissolved substances have varying degrees of physical properties of the reservoir. Among them, authigenic kaolinite and authigenic quartz show a positive effect on pore generation and protection, whereas those of authigenic carbonates and authigenic illites are mainly responsible for pore generation and The negative aspects of protection.