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构造应力对油气运移聚集的影响是油气运移聚集机理研究中的重要课题。大民屯凹陷是个勘探程度高的“小而肥”的凹陷。依据其翔实的勘探开发资料研究该凹陷构造应力场与油气运移聚集的规律性关系，对其它小型盆地或坳陷的勘探有指导意义。应用ＳＡＰ５软件模拟大民屯凹陷油气主要运移期的古构造应力场，并在此基础上计算孔隙流体压力和石油势的分布，预测石油运移的主要方向和聚集部位，其结果与油田实际情况基本吻合。研究表明，石油总是由高势区向低势区运移，油势低势区是石油富集的区域。地应力变化影响孔隙压力和油势，因而对石油运移和聚集有重要影响。在平行最大主应力（垂直最小主应力）的方向上储集层连通性最好，为油气运移的主要方向；与最大主应力小角度相交的先期主要断裂的方向也可能成为油气运移的主要方向。图３表１参１１（王孝陵摘）
The effect of tectonic stress on hydrocarbon migration and accumulation is an important issue in the research of hydrocarbon migration and accumulation mechanism. Damintun depression is a high degree of exploration of “small but fat” depression. Based on the informative exploration and development data, the regularity of tectonic stress field and hydrocarbon migration and accumulation in this depression is of great significance to the exploration of other small basins and depressions. Using the SAP5 software to simulate the tectonic stress field of the major migration period of the Damintun sag, and based on this, the pore fluid pressure and the distribution of petroleum potential are calculated, and the main directions and sites of petroleum migration are predicted. The results are in good agreement with the actual Basically the same situation. Research shows that oil always moves from the high-potential area to the low-potential area, and the low-oil-potential area is a petroleum-enriched area. Changes in geostress affect pore pressure and oil potential, and therefore have a significant impact on the migration and accumulation of petroleum. The reservoirs have the best connectivity in the direction of maximum parallel principal stress (vertical minimum principal stress), which is the main direction of hydrocarbon migration. The direction of the primary fault intersected with the small maximum principal stress may also be the hydrocarbon migration The main direction. Figure 3 Table 1 Senate 11 (Wang Xiaoling pick)