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鄂尔多斯盆地H地区三叠系延长组主力油层为长6、长4+5、长2油层组,为典型的低渗透储层。为了掌握该地区各油层地下流体渗流规律及油水两相驱替特征,此次研究运用真实砂岩模型,对H地区主力油层进行了水驱油实验,并结合薄片鉴定、物性分析、扫描电镜、相渗、压汞等资料,分析出该地区主力油层驱油效率影响因素主要为微观孔隙结构、驱替压力和润湿性,物性对驱油效率的影响不大。
The main reservoirs of Triassic Yanchang Formation in H area of Ordos Basin are Chang 6, Chang 4 + 5 and Chang 2 reservoirs, which are typical low-permeability reservoirs. In order to grasp the underground fluid seepage law and oil-water two-phase displacements of various oil layers in this area, this study applied the real sandstone model to carry out the water-flooding experiment on the main oil layer in H area. Combined with the identification of thin slices, physical property analysis, SEM, Infiltration and mercury intrusion. The main influencing factors of oil displacement efficiency in the main reservoirs in this area are micro-pore structure, displacement pressure and wettability, and physical properties have little effect on displacement efficiency.