摘要
渐新统东营组中部和下部是否存在区域地层界面一直争议不断。利用三维地震技术发现了不整合反射界面及其对应的整合反射界面,是一个全区统一的等时反射界面。大量钻井资料证实该界面上下地层化石组合、岩性组合和测井响应、元素分析特征迥异,分属于两个生物群落、两个地质时代、两种水体环境和沉积体系,是东营组中部和下部之间的一个地层物理界面,简称东二底。东二底形成于31.08 Ma,是华北构造事件在渤海海域作用的结果,称之为渤海构造事件,动力来源是太平洋板块运动方向由NNW到NWW的转换,导致郯庐断裂走滑方向左旋到右旋的改变、辽东凸起和辽东凹陷的形成,以及气候的改变和多条大规模河流的形成,并造成了水体环境、生物组合和沉积体系的改变。
It has been arguable issue whether there is a distinct stratigraphic boundary within the Dongying Formation. An unconformity and its’ conformity surface are discovered within the Dongying Formation through application of 3D-seism. The surface is distributed all over Bohai Sea. The paleontogical, lithological and geochemical data in combining with E-logging response indicate that the strata below and above the boundary are very different in many aspects, e.g. fossil assemblage, age and depositional condition, demonstrating that the surface represents a distinct unconformity, called "DengerDi". DongerDi was formed by a tectonic event, called Bohai tectonic event, at 31.08 Ma. The tectonic event was resulted from the movement of the Pacific Plate from NNW to NWW, which is characterized by change of the Tanlu-Fracture strike slip direction from left to right,leading formation of the LiaoDong tuberositas and sag, thus changes of climate, fluvial system, sediment transportation, water and deposition conditions.
作者
刘新昕
陈安清
LIU Xin-xin;CHEN An-qing(College of Earth Sciences, Chengdu University of Technology, Chengdu 610059)
出处
《地层学杂志》
CSCD
北大核心
2019年第2期210-218,共9页
Journal of Stratigraphy
基金
“十三五”国家科技重大专项“渤海海域勘探新领域及关键技术研究”(编号:2016ZX05024-003)资助
