梁家—万昌地区同沉积断层对奢岭组沉积的控制作用
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摘要
陆相盆地油气勘探表明,同沉积断层对沉积体的分布具有明显的控制作用。伊通盆地为一走滑为主的盆地,其中始新世西北缘边界断层的右旋走滑运动控制了盆地的形成和演化,走滑运动必然会在盆内派生出一系列次级伸展断层。本文从西北缘走滑断裂活动时间、走滑派生的次级断层的展布及活动时间等方面对同沉积断层进行剖析;同时阐述了同沉积断层对沉积的控制作用,得出三点结论:①盆内边界断层的走滑控制了盆内次级伸展断层的分布特征及活动时间;②分布于万昌围斜带的同沉积断层对沉积体主要起疏导作用,沉积体沿着同沉积断层之间夹持的地带沉积;③分布在梁家地区的同沉积断层控制了沉积体的分布范围,沉积体基本不越过同沉积断层的上升盘进行沉积。
Global exploration of oil and gas in continental basins has already indicated that contemporaneous faults have significant effects on the distribution of depositional body.The research of oil and gas exploration shows that Yitong Basin has been implied to be a strike-slip fault basin.Basin formation and evolution are controlled by the dextral rotation and strike-slip movement of the boundary fault in the northwestern margin of the Eocene.Strike-slip movement is bound to derive a series of contemporaneous fault in the basin.From the aspect of strike-slip fault active time in the northwest edge,distribution and activity time of the secondary faults derived from strike-slip movement,this paper determines the contemporaneous fault and also analyzes its controlling action on the deposition.Three conclusions made are stated below.①The strike-slip movement of boundary faults controls the distribution and active time of secondary tensile faults in the basin.②The contemporaneous fault located in Wanchang slope area has a leading control on the depositional bodies which are deposited along clamp zone between the contemporaneous faults.③The contemporaneous faults located in Liangjia district control the distribution of depositional bodies.Depositional bodies basically do not cross over the upthrow of contemporaneous faults in the deposition process.
引文
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