为明确含油气盆地中断裂体系结构特征与油气藏分布的关系，文章以珠江口盆地珠三坳陷文昌A凹陷西部地区为研究对象，在对各层系断裂精细解析的基础上，通过对断裂网络体系的节点、分支类型分析及分维值计算，定量表征了研究区断裂网络体系的拓扑结构及分形特征，并就断裂网络体系拓扑结构、分形特征与油气藏分布的关系进行了探讨。研究结果表明：受控于区域拉张应力顺时针方向的转变，研究区断裂发育以NE向为主转变为以NWW向为主；不同层系断裂体系的拓扑结构具有差异性，珠三南断裂、珠三6号断裂和珠三2号断裂附近拓扑值较高，由深至浅断裂体系的I节点的比例逐渐增大，Y、X节点的比例逐渐减小，I-I分支的比例逐渐增大，I-C、C-C分支的比例逐渐减小，连通性由好变差；不同层系断裂体系的分形特征具有时空差异，NE向断裂带和NW向断裂带交汇区分维值较高，由深至浅断裂体系的分维值先增大后减小，复杂程度先增强后减弱；断裂体系的拓扑结构、分形特征与与油气藏分布具有良好的耦合关系，高拓扑值与高分维值的叠合区是油气成藏的有利区。

In order to clarify the relationship between characteristics of the fault network system and oil-gas distribution in a petroleum basin, fault systems of each layer were analyzed from a case study of the western area of Wenchang A sag in ZhuIII Depression. The topological structures and fractal characterristics of the fault network system were quantitatively characterized, and their relationship with hydrocarbon distribution was discussed based on the analysis of nodes and branch types and the calculation of fractal dimensions. The results show that faults, which primarily changed from NE to NWW, are controlled by the clockwise transformation of regional stress. The topological structures of each horizon are different, with the topological values near the ZhuIII south fault, ZhuIII 6 fault and ZhuIII 2 fault being higher. The proportion of I nodes in the deep to shallow gradually increases, while the proportion of Y and X nodes gradually decreases. Meanwhile, the proportion of I-I branches gradually increases, and the proportion of I-C and C-C branches gradually decreases. The fractal characteristics from different layers vary. The fractal dimensions of the intersection of the NE fault zone and the NW fault zone are higher, and the fractal dimensions from deep to shallow increased initially and then decreased. Combined with the analysis of Wenchang A sag, we conclude that topological structures and fractal characteristics of the fault systems have a well-coupled relationship with hydrocarbon distribution. Therefore, the overlapping zones of higher topological values and the higher fractal dimensions are favorable development areas f or hydrocarbon reservoirs.