关键词: 三角洲沉积体系, 渤海湾盆地, 早第三纪, 断陷盆地, 下第三系, 沉积相, 基本特征, 沉积作用, 成岩作用, 油气勘探

Abstract: In this artical the characteristics of evolution development and of lower Tertiary in Bohai Basin was summarized and it is pointed out that the gravity flow sediments was widely developed and the lacustrine tempestite can be good reservoirs.It was considered that the new principle of straigraphy(verticle accretion and lateral accretion)will play an important role in petroleum exploration.Through the discusion of diagenesis of depositional sediments,a new view point is suggested about mechanism of formation of the pore space in a reservoir,it is considered that the petrophysical properties of reservoir is control led by both micro-sedimentary facies and diagenesis.It is pointedout that reservoir geology plays a more important role in petroleum exploration and development.