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根据铸体薄片、扫描电镜、物性、孔隙结构、岩芯和测井分析以及化验资料,对青平川油田延长组长4+5、长6砂岩储层的研究表明,该套储层岩石类型以长石砂岩为主,次为岩屑长石砂岩;孔隙类型主要发育粒间孔、粒内溶孔、晶间微孔、粒缘缝;其孔喉关系以中、小孔~细喉组合为主,小孔~细、微喉型组合与小孔~微喉型组合次之,少部分为中、小孔~粗喉及微孔~微喉型。
The study on the 4 + 5 and Chang 6 sandstone reservoirs of Yanchang Formation in Qingpingchuan Oilfield shows that the rock type of the reservoir is Feldspathic sandstone, and secondly feldspar feldspar sandstone. The pore types mainly include intergranular pores, intragranular dissolved pores, intergranular micro-pores, and marginal seams. The pore-throat relationship is characterized by medium- and small-pore- The main, small holes ~ fine, throat type combination of small holes and micro-throat type followed, and a small part of the small holes ~ throat and micro-throat ~ micro-throat type.