吐哈盆地台北凹陷侏罗系油气富集地质条件及油气分布规律

THE GEOLOGIC CONDITION OF PETROLEUMACCUMULATION AND DISPERSION REGULARITYOF THE TAIBEI DEPRESSION OF THE TUHABASIN IN THE JURASSIC

分析了吐哈盆地台北凹陷侏罗系油气富集地质条件，探讨了其油气分布规律，指出了今后油气勘探的方向。４套２类良好的油源、多套储集性能良好的砂体、有效的圈闭、２套封盖性能极好的区域性盖层及优越的生储盖组合配置是油气富集的基本地质条件；构造、构造—岩性复合是主要的油气藏类型；环主力生油凹陷、沿短轴分布的砂体与燕山期的古构造及喜山期改造加强的构造叠置、多期活动的油源断裂控制油气是油气分布聚集的规律；中部凹陷区的深挖细找，山前褶断带、火焰山背斜带及逆冲断裂上下盘构造，是今后油气勘探的方向。

The geologic condition of petroleum accumulation is analysed,petroleum dispersion regularity is discussed and the target of petroleum exploration of the Taibei depression of the Tuha Basin in Jurassic is provided.In Jurassic of the TaiBei depression of the Tuha Basin,the foundamental geologic conditions for petroleum accumulation consist of four good source beds which are divided into two types.Numerous sand bodies that have good reservior function,effective traps,two regional covers which can enclose perfectly and excellent disposition condition of the source,reservior and cover.The structure trap and structure-lithologic trap are main types of the oil and gas accumulation.Encircling main source depression and the sand body along short axis distribution and the ancient structure of Yanshan cycle and the pile up structure of Xishan cycle are principles of oil and gas accumulation.Varied activity source faults control oil and gas distribution.The middle part of the depression,foremountain fault-fold bets,Huoyan mountain anticline belt and the upper/down side of the overthrust fault are our exploration targets in the future.