二连盆地巴音都兰凹陷反转构造及成因机制

发布时间：2018-12-17 10:22

【摘要】：二连盆地的构造反转事件一直有争议.为了查明二连盆地巴音都兰凹陷早白垩世期间反转构造的发育期次以及不同时期发生反转构造的动力机制,利用新处理的覆盖全凹陷的3D地震数据和钻井资料,识别并分析了研究区在裂陷期发育的4期正反转构造,分别对应阿三段沉积末期、阿四段沉积末期、腾一下段沉积末期以及腾二段沉积期.研究表明:研究区早白垩世岩浆底辟较为活跃,在阿三段、阿四段和腾一下段以及腾二段沉积末期均发育过岩浆底辟活动,并导致盆地局部发生构造正反转,而腾二段沉积期间除了发育岩浆底辟作用导致构造反转外,还发育左旋压扭活动,并导致构造正反转.因此,研究区在早白垩世发育了两种不同成因类型的正反转构造,这主要与二连盆地在早白垩世期间伊泽纳琦板块对欧亚大陆的俯冲和异常地幔隆升引起的岩浆底辟作用以及腾二段沉积期伊泽纳琦板块俯冲方向发生改变而导致的区域走滑作用密切相关.
[Abstract]:The event of structural inversion in Erlian basin has always been controversial. In order to find out the development times of inversion structure during the early Cretaceous and the dynamic mechanism of inversion structure in different periods, the newly processed 3D seismic data and drilling data covering the whole sag are used to find out the development times of inversion structure in Bayindolan depression, Erlian Basin. The four positive and inverse structures developed in the rift period in the study area were identified and analyzed, respectively, corresponding to the late sedimentary stages of the third member, the fourth member, the late stage of the Tengxia formation, and the sedimentary stage of the second member of the Tengxian formation. The study shows that the early Cretaceous magmatic diapir was active in the study area, and magmatic diapir activity developed in the late sedimentary stages of the A3, A4 and Tengxia members, as well as in the late stage of the Teng member, which led to the positive and negative tectonic transformation in the part of the basin. In addition to the magmatic diapir, the tectonics of the second member of the Teng member developed the activity of left spin and torsion, which resulted in the positive and negative turn of the structure in addition to the magmatic diapir. Therefore, in the early Cretaceous, two different genetic types of positive and reverse structures were developed in the study area. This is mainly due to the magmatic diapir caused by the Yizenaqi plate subduction to Eurasia and the abnormal mantle uplift during the early Cretaceous in Erlian Basin, and the change of the subduction direction of the Yizenaqi plate during the depositional period of the second member of the Teng member. The regional strike-slip is closely related.
【作者单位】：中国石油华北油田公司地球物理勘探研究院;中国石油大学地球科学学院;
【基金】：国家重大科技专项(No.2011ZX05009-002) 中国石油天然气股份有限公司重大科技专项(No.2014E-35) 中石油华北油田公司博士后科研课题(No.2016-HB-L01)
【分类号】：P542

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