渤海南部新生代构造发育与演化特征

发布时间：2018-01-24 08:51

本文关键词： 构造特征渤海南部郯庐断裂带新生代渤海湾盆地　出处：《大地构造与成矿学》2017年01期 　论文类型：期刊论文

【摘要】：利用三维地震资料及钻井资料,在对断裂体系精细刻画的基础上,结合区域地球动力学背景,就渤海湾盆地渤海海域南部地区(包括渤南低凸起、黄河口凹陷、莱北低凸起、莱州湾凹陷)新生代的构造发育演化特征及沉积沉降中心迁移规律进行了详细分析。研究结果表明:断裂体系存在三组优势发育方向,NNE向断裂属郯庐断裂带渤南段,可分为西、中、东三个分支带,走滑特征明显;近EW向及NE向为伸展性质的控凹、控带断裂;三组断裂相互切割,形成了渤海南部地区"东西分带、南北分块"的构造格局;古近纪具有两个沉积沉降中心,黄河口凹陷中心受控于近EW向断裂,莱州湾凹陷的沉积中心受近EW向和NNE向断裂共同控制,至新近纪,沉积中心呈由南向北迁移的规律;渤海南部地区构造演化体现了断拗与走滑的叠加效应,可以划分为孔店组沙四段沉积期的初始裂陷、沙三段沉积期的伸展裂陷、沙二段东营组沉积期的走滑伸展和馆陶组沉积期以来的走滑裂后拗陷四个阶段。
[Abstract]:Based on the detailed description of the fault system and the regional geodynamic background, the south area of Bohai Sea area (including Bonan low uplift and Huanghe Estuary depression) in Bohai Bay Basin is studied by using 3D seismic data and drilling data. The evolution characteristics of Cenozoic tectonics and the migration of sedimentary subsidence center in Laibei low uplift and Laizhou Bay sag are analyzed in detail. The results show that there are three dominant development directions in fault system. The NNE fault belongs to the southern segment of the Tanlu fault zone, which can be divided into three branches: west, middle and east, with obvious strike-slip characteristics. The near EW and NE directions are extensional concave and controlled zone faults. The three groups of faults cut each other, forming the tectonic pattern of "east-west zonation, north-south block" in the southern area of Bohai Sea. There are two sedimentary subsidence centers in Paleogene. The center of Huanghou sag is controlled by near EW fault, and the sedimentary center of Laizhou Bay depression is controlled by near EW direction and NNE direction fault to Neogene. The sedimentary center moves from south to north. The tectonic evolution of the southern Bohai Sea reflects the superposition effect of fault depression and strike-slip, which can be divided into initial rift in the depositional period of the fourth member of Yunsha formation in Kongdian formation and extensional rift in the sedimentary period of the third member of Shahejie formation. There are four stages of strike-slip extension in the sedimentary period of the Yidongying formation in the second member of the Shahejie formation and four stages of the post-depression of the strike-slip rift since the sedimentary period of the Guantao formation.
【作者单位】：中国石油大学(华东)地球科学与技术学院;青岛海洋科学与技术国家实验室;中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项(2016ZX05024-002-001) 中央高校基本科研业务费专项资金(16CX06043A)联合资助
【分类号】：P618.13;P548
【正文快照】： 0引言控制作用(孙景耀等,2006;牛成民,2012;辛云路等,2013),其成因机制存在“走滑拉分”与“伸展主控、走渤海南部海域位于渤海湾盆地济阳坳陷以东海滑改造”的争议(蔡东升等,2001;彭文绪等,2009b;域,包括渤南低凸起、莱北低凸起和黄河口凹陷、黄雷等,2012a;牛成民,2012)。上

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