On the basis of the rich drilling, seismic and structural evolution, with the analysis of regional stress background and the nu⁃merical stimulation method of structural stress field, the rock parameters were optimized to set the boundary constraints and subdivide the network reasonably. Therefore, the crustal stress field geological model of West Lake sag was established and the distribution char⁃acteristics of the crustal stress field were simulated. Furthermore, the distribution characteristics of the fluid potential in West Lake sag were calculated from the relation of crustal stress field and fluid migration to analyze their correlation for the discussion of the in⁃fluences of stress on hydrocarbon migration. At last, according to the distribution of crustal stress field and fluid potential field, the control action of crustal stress on the direction of hydrocarbon migration was analyzed by single factor to predict the optimum direction of hydrocarbon migration and point out the possible accumulation. It provided scientific basis for the selection of the exploration target.%依据西湖凹陷丰富的钻井、地震及区域构造演化资料，分析区域地应力背景，利用构造应力场数值模拟方法，优选岩石参数，合理设置边界约束条件及网格划分，建立西湖凹陷地应力场地质模型并模拟出地应力场的分布特征；根据地应力场与流体运移之间的关系进一步计算出西湖凹陷流体势的分布特征，分析地应力与流体势的相关性，从而探讨应力作用对油气运移的影响。最后依据地应力场和流体势场的分布，单因素分析地应力对油气运移方向的控制作用，预测油气有利的运聚方向并指出可能的油气藏有利运聚区带，为勘探目标选择提供科学依据。
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