二连盆地巴音都兰凹陷反转构造及成因机制  

The Inversion Structures and Their Genetic Mechanisms of Bayindulan Sag,Erlian Basin

作　　者：陈树光[1,2] 张以明 崔永谦 肖阳 秦凤启 吕德胜 祖志勇 李勇[1] Chen Shuguang Zhang Yiming Cui Yongqian Xiao Yang Qin Fengqi Lu Desheng Zu Zhiyong Li Yong(Geophysical Exploration Research Institute, Huabei Oil field Company, PetroChina, Renqiu 062552, China College of Geosciences, China University of Petroleum Beijing, Beijing 102249, China)

机构地区：[1]中国石油华北油田公司地球物理勘探研究院,河北任丘062552 [2]中国石油大学地球科学学院,北京102249

出　　处：《地球科学（中国地质大学学报）》2017年第4期559-569,共11页Earth Science-Journal of China University of Geosciences

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)

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.The Geologic structure of Erlian basin has been controversial.To make clear the developmental periods of inversion structure and their genetic dynamic mechanism of Bayindulan sag,Erlian basin in Early Cretaceous,we make use of the new processing of 3D seismic data covering the all sag to identify the important tectonic unconformity interfaces and to make sure the contact relationship between the strata developed in Early Cretaceous.Combined the igneous rock revealing in drilling data,we think that the late 3rd Member of K1 ba Formation,and the late 4th member of K1 ba Formation,the late K1bt1,and the late K1bt2 mainly all developed normal inversion structures.The further studies indicate that the four positive inversion structures in the Early Cretaceous were caused by the developing magmatic diapiric structure under the setting of the regional extensional stress field;while inversion structure in early K1bt2 was typically caused by the regional strike-slip movement.Therefore,the genetic mechanisms of various inversion structures developed in different periods are dissimilar,which was closely coordinated with the subduction of Paleo-Pacific plate to Eurasia,the effects of the magmatic diapiric caused by the metasomatic mantle and regional strike-slip action resulted by the change of subduction direction of Paleo-Pacific plate during the Early Cretaceous period.

关 键 词：巴音都兰凹陷 早白垩世 反转构造 成因机制 石油地质 

分 类 号：P618.13[天文地球—矿床学]