北塘凹陷第三系油气藏形成条件与油气分布

从构造演化、油源、圈闭、砂体展布与储集层条件、成藏关键时刻的配套、异常地层压力等方面，阐述黄骅坳陷北塘凹陷地质特征及其形成油气藏的基本地质条件，认为该区主要存在3种含油组合以塘沽、新村、炮台等构造为代表的自生自储型含油组合，以新港构造为代表的古生新储型含油组合，新港南—海河断层下降盘中浅层含油组合。该区油气分布规律是油层纵向分布受储盖组合与构造活动共同控制；油气平面分布受烃源岩控制，生油凹陷区油气富集程度较高；古构造倾没部位油气富集程度较高；海河、塘北等大断层控制构造形成与发育，控制油气富集与高产；北西向断层控制局部构造圈闭的形成和发育，对北西轴向的油气藏平面分布具有重要的控制作用。图4参3（邓荣敬摘）

Forming conditions and distribution characteristics of Tertiary oil and gas pools in Beitang sag

The authors describe the geology of Beitang sag and its favorable conditions for reservoir forming from the aspects of tectonic evolution, trap condition, oil source, distribution of sand bodies and reservoirs, abnormal high pressure and coincidence of oil generation, migration, gathering and traps' forming. According to different tectonic evolution history and the assemblage of source reservoir seal rocks, three types of oil combination can be defined. They are Tanggu Xincun Paotai oil combination, Xingang oil combination and southern Xingang oil combination. Plane distribution of oil and gas is strictly confined by efficacious source rock and vertical distribution of oil beds is controlled by tectonic evolution history and the assemblage of reservoir and seal rock. The pitching ends of paleo high are always the favorable targets to petroleum exploration because of their great thickness of sand body and good reservoir. Large scale faults and NW trending faults also play importvant roles in distribution of oil and gas.