【摘要】 <正> 渤海湾及沿岸盆地面积约20万平方公里,包括河北省,山东省北部和西部、辽宁省南部、河南省北部、天津市和北京市等陆地面积约12万7千平方公里,渤海海域面积为7万多平方公里。陆地面积大部被第四纪冲积层所覆盖。渤海最大深度为70米,平均深度为18米。这是一个大型的第三纪断陷-坳陷沉积盆地,是继大庆油田开发之后,在我国东部地区所开发的另一个重要的含油气盆地(图1)。更多还原

【Abstract】 The Bohai Gulf Coastal Basin——an important oil and gas province of Chinacovers an area of 200,000 sq.km.It is a polycyclic superimposed basin. Its history of development can be subdivided into four stages:1) Late proterozoic parageosycline Stage (Sinian).2) Early Palaeozoic cratonic stage (Lower Cambrian-Middle Ordovician).3) Late palaeozoic intracratonic coal-bearing sequences stage(Middle Carboniferous-Permian).4) Mesozoic and Cenozoic taphrogenic rifting and subsidence stages. During the Paleogene rifting stage, three NNE trough systems and three nearlyE-W trough systems were initiated as the results of regional extensional stresses. Central rift valleys, low angle gravity faults and a series of wedgeshaped troughs were developed symmetrically surrounding the "Bohai Mantle Plume". The rifting troughs were extended and widened gradually.During the Neogene, a large saucer-shaped sedimentary basin was developed as a thick blanket covering the whole areas either of the Paleogene troughs or the Palaeozoic-Sinian highs.Oil and gas fields are mainly distributed in the Paleogene trough systems controlled by the Rifting Zones. Tertiary structural traps such as Shengli oilfield, Gu-dao Oilfield and Dagang oilfield are large oil pools. Sinian-Palaeozoic buried-hill traps beneath the Tertiaty unconformity such as Renqiu Oilfield is also a giant Oilfield of the Bohai Gulf Coastal Basin.更多还原