东海陆架盆地西湖凹陷花港组河流扇源汇系统研究
Study on the River Fan Source and Sink System of the Huagang Formation in the West Lake Sag of the East China Sea Shelf Basin

东海陆架盆地西湖凹陷花港组是重要油气储层，其物源–沉积系统的演化规律对隐蔽油气勘探具有指导意义。研究通过地震资料、测井数据与沉积分析，解析构造与沉积的耦合机制：1) 构造活动控制物源方向，早期东北向断裂主导近源浊积扇发育，后期西北向次级断裂促进远源网状河道砂体形成；2) 主断裂带浊积扇前端形成优质储层(孔隙度8%~25%)，次级断裂溶蚀作用提升储集性能；3) 主断裂带浊积扇前端形成优质储层(孔隙度8%~25%)，次级断裂溶蚀作用提升储集性能；4) 油气沿断裂垂向运移，构造–岩性复合圈闭为勘探重点。最终构建“构造控源–地貌控渠–气候控相–断裂控聚”四元耦合模型，为类似盆地勘探提供理论依据。
The Huagang Formation in the West Lake Sag of the East China Sea Shelf Basin is an important oil and gas reservoir, and the evolution of its provenance-sedimentary system is of guiding significance for concealed oil and gas exploration. Through seismic data, logging data and sedimentary analysis, this study reveals the coupling mechanism between tectonic and sedimentary: 1) tectonic activity controls the direction of the source, with the northeast-trending faults dominating the development of near-source turbidity fans in the early stage, and the northwest-trending secondary faults promoting the formation of distal reticulated channel sand bodies in the later period; 2) Climate affects sediment types by adjusting erosion intensity, and the transport capacity of sand bodies in wet period is enhanced, and the proportion of argillaceous sediments in dry period increases. 3) Oil and gas migrate vertically along the fault, and the tectonic-lithologic composite trap is the focus of exploration. Finally, a quaternary coupling model of “tectonic source control, geomorphological channel control climate control, fault control” was constructed to provide a theoretical basis for the exploration of similar basins.