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白垩系砂岩储层是松辽盆地主要油气层 ,砂岩成分以石英、长石和岩屑为主 ,为长石砂岩、岩屑长石砂岩和长石质岩屑砂岩。储层孔隙包括粒间孔、粒内溶孔、铸模孔、胶结物内溶孔、裂缝等。储层孔隙演化经历了早、中、晚等成岩阶段 ,在中成岩阶段早期、晚成岩阶段早期和晚期有 3次次生孔隙发育 ,其对储层性质有明显的改善。本区砂岩储集层可分为 4个类型 ,且具有不同的分布规律
Cretaceous sandstone reservoirs are the main oil and gas layers in the Songliao Basin. The sandstone is dominated by quartz, feldspar and cuttings, and is composed of feldspar sandstone, feldspathic feldspathic sandstone and feldspathic lithic sandstone. Reservoir pores include intergranular pores, intragranular dissolved pores, mold holes, cement dissolved pores, cracks and the like. The evolution of reservoir porosity has experienced diagenetic stages such as early, middle and late stages. In the early stage of diagenetic stage, there are three secondary pores in early and late late diagenetic stage, which have obvious improvement on reservoir properties. The sandstone reservoirs in this area can be divided into four types and have different distribution rules