Based on the study of hydrocarbon migration conditions in the eastern area of Bohai Sea,models of lateral accumu-lation and vertical transfer of transporting ridges for buried hill unconformity and body sands in the bottom of the Guantao for-mation were established,and further quantified the transfer capacities for shallow Neogene accumulation. The results show that the accumulation capacity of buried hill unconformity is related to contact size between source rock and ridge,ridge dip and trap area on the ridge. An index of accumulation(Ia) for transporting ridge is introduced which combines known oilfields data. A ten-million-tons class Neogene oilfield above the buried hill can be predicted if Iais bigger than 30 km·km2. Trans-fer capacity of sand body ridge in the Guantao formation is controlled by the trap area on the ridge,ridge dip,configuration between ridge and fault,and fault activity. A non-dimensional index of difference(Id) and an index of transfer(It) are es-tablished from successful reservoirs to show that the transfer capacity of sand ridge becomes beneficial for shallower accumula-tion if Idis smaller than 0.5 and Itis larger than 100. The study provides insights into quantitative description of transporting ridge'transfer capacity,and has proven a successful implication in the Neogene exploration of slope zones in the eastern area of Bohai Sea.%通过对渤海东部油气运移条件的研究,建立潜山不整合面、新近系馆陶组底部骨架砂体两种输导脊横向聚油和垂向中转模型,并对输导脊中转能力进行定量化表征.结果表明:潜山不整合面输导脊横向聚油能力与输导脊-烃源岩接触程度、输导脊倾角及输导脊顶部圈闭面积有关,在已发现油田数据的基础上创建聚油系数Ia,当Ia>30 km ·km2时,潜山上覆新近系具备形成千万吨级油田的潜力;馆陶组底部骨架砂体输导脊中转能力受控于输导脊顶面圈闭面积、输导脊倾角、输导脊-断层配置、断层活动性等方面,结合已成藏井区建立骨架砂体输导脊无量纲的偏差系数Id和中转系数It,当Id<0.5且It>100时,骨架砂体之上浅层成藏可能性较高;研究提供了输导脊中转能力的定量评价思路与方法,在渤海东部斜坡带新近系油气勘探中取得了较好的应用效果.
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