Abstract: After many years of exploratory practice in Bohai Bay Basin,breakthroughs both in practice and knowledge have been made in this inshore area(0-5m below water surface),in which the exploration level is still low.Relying on a fact that depo-center and subsidence center have migrated gradually from the basin edges toward the Bohai Bay center since the early Tertiary Paleocene,and combining with features of the known oil-gas bearing belts,the favorable position in petroleum geology and oil-gas bearing features of inshore area are discussed in this paper from a point of view of petroleum system.The inshore area is just located in the superimposed or stacked area between Es₄-Es₃ source rocks and Es₁-Ed source rocks.Meanwhile,it possesses the onshore Es₃ and Es₁ as well as the offshore Nm and Ng regional seal rocks.Hydrocarbon-supplying period of the two sets of source rocks in long(Ed-Q).Many oil-gas bearing horizons were formed in the inshore area.Finally,proposals for further research and exploration are offered aiming at the existed favorable exploratory targets in this area.

Key words: Bohai Bay Basin, inshore area, oil-gas accumulation, petroleum system, petroleum exploration

摘要： 经过多年的勘探实践,渤海湾盆地滩海地区虽然目前的勘探程度仍很低,但在认识和实践两方面却均有较大的突破.依据盆地自第三纪古新世以来,沉积和沉降中心由陆地周缘向海域中心的逐步迁移特征,并从含油气体系的角度,结合已知含油气区带,探讨滩海地区所处的有利石油地质位置和含油气特征.滩海地区正处于Es₄-Es₃和Es₁-Ed两大套生烃岩系的叠置复合区.同时具备陆上的Es₃和Es₁以及海上的Ng和Nm等多套区域盖层.两大套烃源岩供油期长(Ed-Q),形成Ar至Nm多套含油气层系.油气非常富集.

关键词: 渤海湾盆地, 滩海, 油气聚集, 含油气系统, 油气勘探