Effects of Neo-Tethyan evolution on the petroleum system of Persian Gulf Superbasin

Considering the Neo-Tethyan tectonic process and the resulting environmental changes,a geodynamic model of“one-way train loading”is proposed to analyze the formation and evolution mechanism of the Persian Gulf Superbasin with the most abundant hydrocarbons in the world.The Persian Gulf Superbasin has long been in a passive continental margin setting since the Late Paleozoic in the process of unidirectional subduction,forming a superior regional space of hydrocarbon accu-mulation.During the Jurassic-Cretaceous,the Persian Gulf Superbasin drifted slowly at low latitudes,and developed multiple superimposed source-reservoir-caprock assemblages as a combined result of several global geological events such as the Hadley Cell,the Equatorial Upwelling Current,and the Jurassic True Polar Wander.The collision during the evolution of the foreland basin since the Cenozoic led to weak destruction,which was conducive to the preservation of oil and gas.Accordingly,it is be-lieved that the slow drifting and long retention in favorable climate zone of the continent are the critical factors for hydrocarbon enrichment.Moreover,the prospects of hydrocarbon potential in other continents in the Neo-Tethyan were proposed.

新特提斯域演化对波斯湾超级含油气盆地形成的影响

基于新特提斯构造域动力过程及其所诱发的环境变化,并通过构建“单向列车装货”地球动力学模型,研究全球油气资源最富集的波斯湾含油气盆地形成与演化机制。研究表明:(1)单向俯冲动力过程中波斯湾超级含油气盆地自晚古生代以来长期处于被动陆缘,区域上形成优越的油气成藏组合发育空间;(2)波斯湾超级含油气盆地在侏罗纪—白垩纪期间长期在低纬度区慢速漂移,在哈德里环流、赤道上升洋流、侏罗纪真极移等全球性地质事件的共同作用下发育了多套叠置的“源-储-盖”组合;(3)新生代以来的前陆盆地演化阶段碰撞破坏作用弱,有利于油气资源保存。在波斯湾超级含油气盆地实例解剖的基础上,提出陆块慢速漂移及在有利气候带长时间留置是油气富集的关键因素,并对特提斯域内其他陆块的油气资源前景进行了展望。