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根据铸体薄片、扫描电镜、压汞分析,对鄂尔多斯盆地川口油田小李渠区长6砂岩储层特征进行研究.结果表明,研究区岩性主要为长石砂岩和岩屑质长石砂岩,具有典型的低成分成熟度、高结构成熟度特征。孔隙类型多样,主要为粒间孔、长石溶孔和浊沸石溶孔。储层物性较差,受沉积相带和成岩作用的双重影响,其中分流河道微相最有利于储层发育;压实作用和胶结作用使孔喉缩小,而成岩早期的绿泥石有利于原生粒间孔的保存,溶蚀作用产生了一定的的长石和浊沸石溶蚀孔隙,是主要的增孔因素。
The characteristics of Chang 6 sandstone reservoir in Xiaoliqu area of Kawaguchi oilfield in Ordos Basin were studied based on the thin cast film, scanning electron microscopy and mercury intrusion analysis.The results show that the lithology of the study area is mainly feldspar sandstone and feldspathic feldspathic sandstone, With a typical low-maturity, high-maturity characteristics. Porous types, mainly intergranular pores, feldspar limestone and pore lapolysis. Reservoir property is poor, which is influenced by sedimentary facies belt and diagenesis. Among them, distributary channel microfacies are most favorable to reservoir development; compaction and cementation make pore throat shrinkage, while early diagenetic chlorite is good for primary Intergranular pore preservation, dissolution of a certain amount of feldspar and voikite dissolution pores, is the main hole factor.