东海陆架盆地长江坳陷新生代原型盆地分析
BASIN PROTOTYPE OF THE CENOZOIC CHANGJIANG DEPRESSION IN THE EAST CHINA SEA SHELF BASIN
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摘要: 利用地震剖面对东海陆架盆地长江坳陷新生代构造进行解析,认为长江坳陷新生代经历多次构造运动,尤其古新世末的瓯江运动对该区构造定型尤为突出,其中,该坳陷中的挤压反转、地垒等构造对油气的圈闭、运移和保存具有重要意义。主要利用平衡剖面技术,对东海陆架盆地长江坳陷进行盆地原型的恢复。最后,结合长江坳陷的构造演化的特点,得出长江坳陷古新世原型盆地类型为拉分盆地,原型盆地的长轴方向为EW向,但主要受NE向断裂控制,且盆地基本定型于T12之后。Abstract: The interpretation of seismic profiles for Cenozoic structures of the Changjiang Depression in the East China Sea Shelf Basin was carried out.It suggests that many Cenozoic tectonic movements occur in this depression.The Oujiang movement happened in late Paleocene is especially important to the formation of the present geometry of the depression.Data show that inversed anticlines and horsts are very significant for trapping,migration and preservation of oil and gas in the Changjiang Depression,and T30 is a critical time for the formation of the present geometry.The technique of balanced sections is used for reconstruction of the prototype basin.It is concluded that the Changjiang Depression was a pull-apart basin in Paleocene with the long axis in EW direction.The faults in NE direction played most important role in the formation of the basin after the time of T12.
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