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油气成藏系统与运移通道的分布决定了油气运移的方向和数量。本文从砂岩孔隙型通道入手，着眼于资源评价目的，提出应用同类地区工业性油气田（藏）下限标准与不同时期油气汇聚区的水流量来定义临界饱和度。该饱和度值所圈闭的范围，即为有效运聚通道。利用盆地模拟结果参数可分别计算平面和剖面上的水流量，从而得到不同地质历史时期有效运聚通道的分布范围，这将有利于运聚史和运聚量的研究。
The distribution of hydrocarbon accumulation systems and migration channels determines the direction and amount of hydrocarbon migration. In this paper, starting from the sandstone pore passage, focusing on the purpose of resource evaluation, we propose to define the critical saturation by applying the lower limit of industrial (Tibetan) oil and gas reservoirs in different regions and the flow rate of oil and gas in different periods. The saturation value of the trapped range, that is, effective transport channel. The simulation results of the basin can be used to calculate the water flow in the plane and the section, respectively, so as to obtain the distribution range of effective transport channels in different geologic historical periods, which is beneficial to the study of transport history and transport of aggregates.