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根据铸体薄片、扫描电镜、高压压汞等分析化验资料,对吴定地区长6油藏砂岩储层特征进行研究。结果表明:该套储层岩性主要为长石砂岩和岩屑长石砂岩,成分和结构成熟度都偏低;储集空间以粒间孔和溶蚀孔为主;储集性能差,原始产能低,非均质性强。储层受沉积微相、成岩作用的综合影响,其中,水下分流河道为有利储层发育的微相,成岩早期由于大量粘土膜的形成,有利于部分原生孔隙和喉道的保存,溶孔的大量存在使各类孔隙有效连通,提高了储层的渗透性。
The sandstone reservoir characteristics of Chang 6 reservoir in Wuding area were studied based on the analytical laboratory data of cast thin films, scanning electron microscopy and high pressure mercury intrusion. The results show that the lithology of the reservoir is mainly feldspar sandstone and feldspathic feldspathic sandstone, with low composition and structural maturity. The reservoir space mainly consists of intergranular pores and dissolved pores. The reservoir properties are poor. The original productivity Low, high heterogeneity. The reservoir is affected by the combined effect of sedimentary microfacies and diagenesis. Among them, the sub-distributary channel is the microfacies for favorable reservoir development. Due to the formation of a large amount of clay film in the early diagenesis, it is favorable for the preservation of some primary pores and throats, The existence of a large number of effective connectivity of all types of pores to improve the permeability of the reservoir.