高尚堡油田北区沙三~(2+3)亚段储层特征研究

高尚堡油田北区沙三2+3亚段含油层段长,储层特征变化大,通过对铸体薄片、岩心砂岩薄片和压汞等资料分析,开展了储层岩性、物性、储集空间类型和孔隙结构等方面的研究工作。结果表明,高尚堡油田北区沙三2+3亚段储集层岩性以岩屑长石砂岩为主,成分成熟度、结构成熟度均较低,主要发育粒间溶孔、粒内溶孔,孔隙结构以Ⅱ类为主,为典型的中低孔中低渗型储层。平面上储层物性受沉积相带控制;垂向上成岩作用中的压实和胶结作用导致储层物性变差,而溶解作用产生的次生孔隙改善了储层物性。

Study on the reservoir characteristics of the second and the third sub-members of the third member of Shahejie Formation in north area of Gaoshangpu oilfield

In second and the third sub- members of the third member of Shahejie formation in north area of Gaoshangpu Oilfield,the oil-bearing interval is long,with big variance on reservoir characteristics.Through the cast thin sandstone core sheet and mercury,such as data analysis,carried out reservoir lithology,physical property,Research reservoirspace types and pore structure and other aspects of the work.The results show that the reservoir lithology of the second and the third sub-members of the third member of Shahejie formation in north area of Gaoshangpu oilfield are mainly of lithic feldspathic sandstone,with lower compositional maturity and structure maturity,and mainly developed intragranular pores and dissolved pores,mainly withⅡ pore structure,namely the typical low-porosity and low-permeability reservoir.On the plane,the physical property is controlled by sedimentary facies.The vertical compaction and cementation will lead to deterioration of reservoir properties,while the secondary porosity produced by dissolution will improve reservoir properties.