As the hydrocarbon vertical migration pathway, fault and its relationship with reservoir extremely affect the distribution and accumulation of oil and gas in the non-hydrocarbon generating layers. On both sides of the fault, there are frequently various sand bodies with different oil and gas enrichment. However, previous researches on this differential charging are mostly based on empirical formulas or physical simulation experiments instead of fluid seepage mechanism. This paper proposed a quantitative evaluation method on the basis of Darcy's law to analyze the difference in hydrocarbon lateral diversion capacity through the oil-source fault. It can be seen that in the process of hydrocarbon migrate along the oil-source fault, hydrocarbons could divert laterally into sand bodies through the fault when there is a downward pressure gradient. Conversely, hydrocarbons can only migrate upward along the fault. Furthermore, among the four normal fault-sand body configuration types, the opposite fastigium type is most favorable for hydrocarbons laterally charging whereas the fastigium type is the least beneficial. The ratio of resistance in the sand body to in the fault was proposed as the evaluation index (F_s) to quantitatively evaluate the hydrocarbon lateral diversion migration capacity, on the assumption that hydrocarbons in different sand bodies are sourced from the same source rocks. The index (F_s) is directly proportional to the lateral diversion capacity of hydrocarbon, and is complex controlled by many geological factors including the reservoir permeability, fault-sand body contact length and dip angles of sand body and fault. And the higher the value of Fs, the stronger the hydrocarbons laterally divert ability of the sand body. In addition, the calculation result of well GG16102 in the Beidagang buried hill coincide well with the oil and gas interpretation result indicating that the method is practical to quantitatively evaluate the laterally diverting hydrocarbons of sand bodies under the condition of fault-sandstone configuration.

作为油气垂向运移通道，断层及其与储层的关系极大地影响了非生烃层中油气的分布和聚集。断裂两侧常有油气富集程度不同的各种砂体。然而，以往对这种差异充电的研究大多基于经验公式或物理模拟实验，而不是流体渗流机理。本文提出了一种基于达西定律的定量评价方法，用于分析通过油源断层的油气横向导流能力差异。可以看出，在油气沿油源断层运移的过程中，当存在向下的压力梯度时，油气可以通过断层横向转向进入砂体。反之，油气只能沿着断层向上运移。此外，在四种正断层砂体配置类型中，相反的尖顶类型最有利于烃侧向充注，而尖顶类型最不利于油气横向充注。提出以砂体中与断层中的阻力之比作为评价指标(F _s ) 定量评价油气横向导流运移能力，假设不同砂体烃源来自同一烃源岩。该指数（F _s）与油气横向导流能力成正比，受储层渗透率、断砂体接触长度、砂体与断层倾角等多种地质因素的复杂控制。F值越高s，砂体的烃侧向分流能力越强。此外，北大港潜山GG16102井的计算结果与油气解释结果吻合较好，表明该方法可用于定量评价断砂岩构型条件下砂体横向转向烃。