似花状构造是渤海中南部新生代典型构造样式,对油气运聚具有明显的控制作用。基于渤海勘探实践,充分利用钻井、地震及分析化验资料,系统总结渤海中南部似花状构造带油气成藏特征,精细解析其控制油气运移的过程。研究认为，似花状构造形成的深层初始汇聚和浅层二次汇聚及其叠合关系控制油气差异富集。深层初始汇聚包括潜山风化壳和沙河街组扇体两种介质,风化壳面积以及扇体的面积和厚度是初始汇聚量的主控因素;浅层二次汇聚是指馆陶组构造圈闭对油气的汇聚作用,圈闭形态与盖层条件是二次汇聚量的主控因素。深浅层汇聚中心的叠合关系决定似花状构造油气富集部位:逃逸型模式下油气在其上倾方向高部位富集;贯通型模式下油气富集于主干断层附近;偏心型模式下油气富集于次级断层附近。在研究成果的指导下,成功发现了垦利6-1油田、垦利3-2油田等一系列规模性油气藏,也为其他源外层系油气勘探提供了良好借鉴。

 Flower-like structure is a typical Cenozoic structure in the central and southern Bohai Sea, exerting a significant control on hydrocarbon migration and accumulation. Based on the exploration practice in Bohai Sea, this study systematically summarizes the characteristics of oil and gas accumulation in the flower-like structural belt of the central and southern part of Bohai Sea by leveraging on drilling, seismic and analytical data. It also provides a detailed analysis of the controlling process of oil and gas migration This study concludes that the differential enrichment of oil and gas in flower-like structures is controlled by the deep primary convergence and shallow secondary convergence as well as their superimposed relations. The deep primary convergence consists of two media: buried hill weathering crust and Shahejie Formation fan body. The area of weathering crust, fan body area and thickness are the main controlling factors of the initial convergence volume. The shallow secondary convergence refers to the accumulation of oil and gas in Guantao Formation structural traps, where the trap morphology and caprock conditions are the main factors affecting secondary convergence volume. The superposition relationship between deep and shallow convergence centers determines the oil-gas enrichment location within flower-like structure: in the escape model, oil and gas accumulate at the high updip positions; in the through model, oil and gas are enriched near the main faults; and in the eccentric model, oil and gas are concentrated near the secondary faults. Guided by the above research, successful discoveries have been made, including the Kenli 6-1 oilfield, Kenli 3-2 oilfield and large-scale oil and gas reservoirs, providing valuable insights for hydrocarbon exploration in other source-adjacent strata.