The boundary layer thickness and influence in the single-phase flow in the tight reservoirs have been widely measured. The influence of boundary layer on the oil migration into originally water-saturated tight reservoirs has been theoretically deduced but has not been experimentally validated. In this work, the existence of boundary layer in tight reservoir oil migration is investigated by comparing the oil migration with the influence of boundary layer (measured by tight sandstone oil accumulation experimental simulation) and theoretical oil migration without the influence of boundary layer (derived from rate-controlled mercury injection). The distribution of boundary layer in the tight reservoir is detected by nuclear magnetic resonance centrifugation. The influence of boundary layer on oil migration is discussed by modeling tight reservoir oil migration and analyzing the relationships between oil migration characteristics and tight reservoir pore-throat structures. The results turn out that the boundary layer distributes in all sizes of pores in the tight reservoirs and becomes thinner with the pressure gradient increment. The oil migration into the tight reservoirs is a coupled effect of the increasing driving force and the decreasing capillary pressure caused by boundary layer thinning. The pore-throats in the tight reservoirs are heavily blocked by boundary layer, while the pore-bodies are almost unaffected by boundary layer.

致密储层中的边界层厚度和对单相流的影响已得到广泛测量。在理论上已经推论了边界层对油运入原本含水饱和的致密油藏的影响，但尚未进行实验验证。在这项工作中，通过将油运移与边界层的影响（通过致密砂岩油藏实验模拟测量）和理论油运移（不受边界层的影响）进行比较，研究了致密油藏油运移中边界层的存在。速率控制的汞注入）。通过核磁共振离心法检测致密储层中边界层的分布。通过对致密油藏油藏运移进行建模，分析油藏运移特征与致密油藏孔喉结构之间的关系，探讨了边界层对油藏运移的影响。结果表明，边界层分布在致密储层中所有大小的孔隙中，并且随着压力梯度的增加而变薄。油运到致密油藏中是驱动力增加和边界层变薄引起的毛细管压力降低的耦合作用。致密油藏中的孔喉被边界层严重阻塞，而孔隙体几乎不受边界层的影响。结果表明，边界层分布在致密储层中所有大小的孔隙中，并且随着压力梯度的增加而变薄。油运到致密油藏中是驱动力增加和边界层变薄引起的毛细管压力降低的耦合作用。致密油藏中的孔喉被边界层严重阻塞，而孔隙体几乎不受边界层的影响。结果表明，边界层分布在致密储层中所有大小的孔隙中，并且随着压力梯度的增加而变薄。油进入致密油藏是边界层变薄导致驱动力增加和毛细管压力降低的耦合作用。致密油藏中的孔喉被边界层严重阻塞，而孔隙体几乎不受边界层的影响。