低渗透油藏油水渗流特性研究

通过油水实验，分析了陕西某油田低渗透砂岩储层微观孔隙结构特征及油水两相渗流规律。根据核磁共振扫描分析表明，储层具有较强的微观非均质性，局部大通道体积小，但对渗透率有很大的影响。相对渗透率曲线表明，随着含水饱和度的增加，油相相对渗透率迅速降低，砂砾岩、含砾砂岩和粗砂岩的水相相对渗透率略有增加。中细砂岩水相相对渗透率增加，含水率快速增加，剩余油饱和度高。在岩心驱替过程中，在水驱前缘突破之前，沿程含油饱和度大幅度降低。在水驱前沿突破后，含水量迅速增加，直接进入超高含水阶段。研究成果为油水渗流特性的研究提供了依据。

Research on oil-water seepage characteristics in low permeability reservoir

Through the oil-water experiment，the micro-pore structure characteristics and the oil-water two-phase seepage law of a low-permeability sandstone reservoir in an oil field in Shaanxi were analyzed.According to the NMR scan analysis，the reservoir has strong micro-heterogeneity，and the local large channels are small in volume，but they have a great influence on the permeability.The relative permeability curve shows that with the increase of water saturation，the relative permeability of the oil phase decreases rapidly，and the relative permeability of the water phase of glutenite，conglomerate sandstone and coarse sandstone increases slightly.The relative permeability of the water phase of the medium-fine sandstone increases，the water content increases rapidly，and the remaining oil saturation is high.During the core displacement process，the oil saturation is greatly reduced along the way before the water flooding front breaks through.After the breakthrough of the water drive front，the water content increased rapidly and directly entered the ultra-high water cut stage.The research results provide a basis for the study of oil-water seepage characteristics.