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低渗透油藏是现代石油工业重点研究方向之一。吉林两井油田是中国具有代表性的低渗透油田。将研究区下白垩系泉头组四段储层砂岩划分成 5种岩石微相。分析了近源沉积物、成岩作用及粘土矿物演化对低渗透储层物性的影响 ,复杂的成岩作用是低渗透储层非均质性的主要成因。讨论了低渗透储层孔隙的成因、粘土矿物与微孔隙的关系。在此基础上归纳总结出了4种储层 ,最后根据储层特征与裂隙发育程度建立了 4种低渗透储层油气储渗单元类型
Low permeability reservoir is one of the key research directions of modern petroleum industry. Jilin Liangjing Oilfield is a representative low permeability oilfield in China. The sandstones of the fourth member of the Lower Cretaceous Quantou Formation in the study area are divided into five types of rock microfacies. The effects of near-source sediments, diagenesis and clay mineral evolution on the physical properties of low-permeability reservoirs are analyzed. Complex diagenesis is the major cause of heterogeneity of low-permeability reservoirs. The formation of pores in low permeability reservoirs and the relationship between clay minerals and micropores are discussed. Based on this, four kinds of reservoirs are summarized and summarized. Based on the reservoir characteristics and the degree of fracture development, four types of reservoir units for low-permeability reservoirs are established