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    珠江口盆地荔湾凹陷珠江组关键地质界面SB21的识别及地质意义

    刘思青 张翠梅 孙珍 庞雄 申俊 邱宁

    刘思青, 张翠梅, 孙珍, 庞雄, 申俊, 邱宁, 2016. 珠江口盆地荔湾凹陷珠江组关键地质界面SB21的识别及地质意义. 地球科学, 41(3): 475-486. doi: 10.3799/dqkx.2016.039
    引用本文: 刘思青, 张翠梅, 孙珍, 庞雄, 申俊, 邱宁, 2016. 珠江口盆地荔湾凹陷珠江组关键地质界面SB21的识别及地质意义. 地球科学, 41(3): 475-486. doi: 10.3799/dqkx.2016.039
    Liu Siqing, Zhang Cuimei, Sun Zhen, Pang Xiong, Shen Jun, Qiu Ning, 2016. Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin. Earth Science, 41(3): 475-486. doi: 10.3799/dqkx.2016.039
    Citation: Liu Siqing, Zhang Cuimei, Sun Zhen, Pang Xiong, Shen Jun, Qiu Ning, 2016. Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin. Earth Science, 41(3): 475-486. doi: 10.3799/dqkx.2016.039

    珠江口盆地荔湾凹陷珠江组关键地质界面SB21的识别及地质意义

    doi: 10.3799/dqkx.2016.039
    基金项目: 

    海洋地质国家重点实验室 MGK1213

    国家自然科学基金项目 41106055

    十二五油气重大专项子课题 2011ZX05025-003-005

    中国科学院边缘海地质重点实验室 MSGLMSGL13-05

    国家自然科学基金项目 U1301233

    国家自然科学基金项目 41206038

    详细信息
      作者简介:

      刘思青(1990-),女,硕士,主要从事海洋地质专业研究. E-mail: lsq13140307@126.com

      通讯作者:

      张翠梅,cmzhang@scsio.ac.cn

    • 中图分类号: P736.1

    Characteristics and Significances of the Geological Boundary SB21 in the Zhujiang Formation of the Liwan Sag, Pearl River Mouth Basin

    • 摘要: 荔湾凹陷是珠江口盆地最南部的一个超深水凹陷,其结构特点、沉积过程研究是认识被动陆缘演化的重要内容.运用地震地层学方法,基于高分辨率2D/3D地震资料的沉积追踪与对比,一个特征明显且全区可追踪的地质界面——SB21界面被识别出.该界面上下揭示出多种沉积现象:北部剥蚀区、中北部的沉积物过路区、中南部冲沟和沉积物波叠置区、南部的沉积物堆积区.推测这种沉积样式的多样性与发生在23.8 Ma前后的白云运动有密切关系,该构造运动造成荔湾凹陷的差异性沉降,主要表现为荔湾凹陷中南部的快速沉降,导致凹陷北部及中东部的相对抬升.该期构造运动使原有的沉积平衡发生改变,造成沉积物的再分配,沉积物从北部剥蚀区经过路区向中南部堆积区运移.自东向西发育的冲沟,推测与该时期差异沉降导致中东部近南北走向的相对隆起与西侧沉降区的差异沉降,以及有来自凹陷东北角的物源叠加作用有关.SB21界面的沉积反射特征研究,揭示了洋陆边界复杂多变的沉积过程及其驱动机制,对我们认识更大区域的构造沉积过程具有一定的帮助.

       

    • 图  1  珠江口盆地荔湾凹陷区域位置及结构

      其中:断裂与凹陷地形结构为23.8 Ma的构造,水深等值线使用的是现今水深,用以体现凹陷现今的沉积环境;左下角插入图为珠江口盆地的区域位置(黄色虚线代表盆地的范围,红色矩形为研究区的位置)

      Fig.  1.  The regional location and main structures of the Liwan sag, Pearl River Mouth basin

      图  2  珠江口盆地新生界沉积充填序列及构造演化阶段划分(庞雄等,2008)

      Fig.  2.  The Cenozoic sedimentary sequence and tectonic evolution stages in Pearl River Mouth basin

      图  3  珠江口盆地荔湾凹陷区域地震反射特征(a)和SB21界面典型地震反射特征(b~e)

      b.北部削截反射特征;c.中北部差异反射特征;d.中南部波状反射特征;e.南部双向超覆反射特征;Ⅰ-Ⅱ代表两期海底扇;各剖面具体位置参见图 1

      Fig.  3.  The regional seismic reflection characteristics of Liwan sag, Pearl River Mouth basin (a) and typical seismic reflection characteristics of SB21 boundary (b-e)

      图  4  波状反射区的空间特征(平面和剖面具体位置参见图 1,平面图的底图是23.8 Ma构造图)

      Fig.  4.  Wave reflection characteristics in S and E direction

      图  5  冲沟、沉积物波和珊瑚礁的地质特征对比

      Fig.  5.  The geologic features of gully, sediment wave and coral reefs

      图  6  荔湾凹陷古沉积物波的叠瓦状构造(剖面具体位置参见图 1)

      Fig.  6.  The imbricate structure of the ancient sediment wave in the Liwan Sag

      图  7  SB21界面之上海底扇自北向南的反射特征变化(平面和剖面具体位置参见图 1;纵轴为双程反射时,单位:s)

      Fig.  7.  The seismic reflection characteristics of the submarine fan from north to south above SB21

      图  8  SB21界面之上海底扇自东向西的反射特征变化(平面和剖面具体位置参见图 1;纵轴为双程反射时,单位:s)

      Fig.  8.  The seismic reflection characteristics variation of submarine fan from east to west above SB21

      图  9  (a) T70-T60时期构造沉降量;(b) SB23.8-SB21时期构造沉降量(谢辉,2014)

      Fig.  9.  (a) Tectonic subsidence at T70-SB23.8; (b) Tectonic subsidence at SB23.8-SB21

      图  10  SB21沉积界面特征地质模型(平面图的底图是23.8 Ma构造)

      Fig.  10.  The geological model above SB21

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