渤海湾盆地滩海地区油气富集规律与油气勘探

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。

INSHORE OIL-GAS ACCUMULATION AND EXPLORATION IN BOHAI BAY BASIN

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 Es 4-Es 3 source rocks and Es 1-Ed source rocks.Meanwhile, it possesses the onshore Es 3 and Es 1 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.