Abstract: In accordance with the notion of "gas generation in lake basin" and "reservoir controlling by catchment ridge", deep buried hills and medium-shallow layers in the Bohai Sea have become the main fields where exploration breakthroughs were made in Bohai oilfield since "the Thirteenth Five-Year Plan" (2016-2020), and a number of oil and gas fields with the reserves over hundred million tons have been discovered. Further, according to the exploration in Bohai Bay Basin, the reservoir-forming conditions and controlling factors of condensate and light oil reservoirs in the basin have been clarified. The key factor for the accumulation of condensate oil and gas reservoirs in Bohai Bay Basin lies in the regional overpressure thick mudstone caprock covered above the oil and gas reservoirs. In the northern Bozhong sag and Liaodong Bay depression, the pressure coefficient of the caprock is greater than 1.4, and the lower buried hill is the important direction for the exploration of condensate oil and gas. The accumulation of light oil in shallow hill of the Bohai Sea is controlled by the deep catchment ridge, and the deep large catchment ridge is the dominant migration-accumulation way of oil and gas. In Bozhong sag, Liaozhong sag, Huanghekou sag and Qikou sag, the resource potential is great, and several kinds of large catchment ridges are developed in their slope belts, sags and low uplifts. The middle-shallow traps above the catchment ridges, especially the subtle lithologic traps, are important exploration fields for medium-light oil reservoirs with good quality and high yield.

Key words: Bohai Sea, gas generation in lake basin, catchment ridge, condensate reservoir, light oil

摘要： 随着"湖盆成气"和"汇聚脊控藏"认识的提出，渤海海域深层潜山和中—浅层成为"十三五"（2016—2020年）规划以来渤海油田取得勘探突破的主要领域，获得多个亿吨级油气田。结合渤海湾盆地的勘探实践，明确了该盆地凝析油气和轻质油藏的成藏条件及控制因素。渤海湾盆地凝析油气成藏的关键要素在于在生油岩到储油层之上覆盖区域性超压厚层泥岩盖层。在渤中凹陷和辽东湾坳陷北部，盖层的压力系数超过1.4，其下部低位潜山是凝析油气勘探的重要方向；而渤海海域中—浅层中—轻质油的成藏则受控于深层"汇聚脊"，深层大型"汇聚脊"是油气的优势运聚方向。渤中凹陷、辽中凹陷、黄河口凹陷以及歧口凹陷的凝析油、轻质油资源潜力大，其斜坡带、凹陷区及低凸起发育多种大型"汇聚脊"，而"汇聚脊"之上的中—浅层圈闭，特别是隐蔽型岩性圈闭是中—轻质优质高产油藏的重要勘探领域。

关键词: 渤海海域, 湖盆成气, 汇聚脊, 凝析油气藏, 轻质油