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    南海万安盆地构造—层序发育特征与构造—沉积充填演化

    肖鸿议 何云龙 解习农 张道军 陆必宇 王亚辉 杨允柳

    肖鸿议, 何云龙, 解习农, 张道军, 陆必宇, 王亚辉, 杨允柳, 2021. 南海万安盆地构造—层序发育特征与构造—沉积充填演化. 地球科学, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064
    引用本文: 肖鸿议, 何云龙, 解习农, 张道军, 陆必宇, 王亚辉, 杨允柳, 2021. 南海万安盆地构造—层序发育特征与构造—沉积充填演化. 地球科学, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064
    Xiao Hongyi, He Yunlong, Xie Xinong, Zhang Daojun, Lu Biyu, Wang Yahui, Yang Yunliu, 2021. Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea. Earth Science, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064
    Citation: Xiao Hongyi, He Yunlong, Xie Xinong, Zhang Daojun, Lu Biyu, Wang Yahui, Yang Yunliu, 2021. Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea. Earth Science, 46(9): 3338-3351. doi: 10.3799/dqkx.2021.064

    南海万安盆地构造—层序发育特征与构造—沉积充填演化

    doi: 10.3799/dqkx.2021.064
    基金项目: 

    中国—东盟海上合作基金项目 12120100500017001

    国家自然科学基金项目 42172125

    国家自然科学基金项目 41502102

    国家“十三五”科技重大专项 2017ZX05026-005-002

    详细信息
      作者简介:

      肖鸿议(1995-), 男, 硕士研究生, 主要从事海洋油气地质学研究.ORCID: 0000-0003-2904-8051.E-mail: 1146616857@qq.com

      通讯作者:

      何云龙, ORCID: 0000-0003-1925-5356.E-mail: ylhe@cug.edu.cn

    • 中图分类号: P618

    Characteristics of Structural-Sequence and Evolution of Tectonic and Sedimentary of Wan'an Basin in South China Sea

    • 摘要: 万安盆地是南海西南部重要的沉积盆地之一,深入分析其构造—沉积充填特征对于认识南海南部主要构造事件及其沉积响应具有重要的科学意义.利用覆盖全盆地的二维地震资料,结合国内外的研究成果,对万安盆地构造—层序特征及其构造—沉积充填演化进行分析.研究表明,万安盆地内新生代以来可识别出8个主要的二级/三级层序界面.沉降模拟显示,盆地沉降整体表现出一个“快—慢—快”的过程,且整体呈现出东高西低,中高南低的特征.综合构造层序特征和沉降模拟结果,万安盆地新生代以来沉积演化可分为5个阶段:初始裂陷期、晚期裂陷期、断坳转换期、裂后热沉降期和裂后加速热沉降期.盆地自形成以来,沉降主要受东亚大陆边缘区域拉张所造成的深部断裂的影响,至上新世,万安断裂转而成为盆地沉降的主要影响因素,并由此造成了早期盆地沉降中心由中部向西迁移,然后再逐步向东迁移的特征.渐新世至早中新世为盆地裂陷阶段,以陆源碎屑岩沉积为主,断陷早期可能为湖相,晚期为浅海相;中中新世为盆地断坳转换阶段,晚中新世以来为盆地裂后热沉降阶段,二者均发育陆源碎屑岩和自生碳酸盐岩两种沉积类型,且裂后热沉降期碳酸盐岩沉积范围相对缩小,陆缘碎屑岩沉积范围相对扩大.

       

    • 图  1  南海南部盆地概况及万安盆地构造单元

      姚永坚等(2018)修改

      Fig.  1.  General situation of basins in the south of the South China Sea and tectonic unit of Wan'an basin

      图  2  万安盆地综合柱状图及区域构造事件

      Fig.  2.  Integrated stratigraphic column and regional tectonic events of Wan'an basin

      图  3  关键构造‒地层界面地震反射特征

      具体位置见图 4

      Fig.  3.  Characteristics of seismic responses of key structural-stratigraphic boundaries

      图  4  万安盆地南典型测线构造‒地层格架综合解释剖面

      Fig.  4.  Mian interpretation profiles showing structure-stratigraphic framework in the south of Wan'an basin

      图  5  虚拟井沉降速率柱状图

      Fig.  5.  Subsidence rate histogram of virtual well

      图  7  典型剖面L3沉降量和构造沉降量曲线

      Fig.  7.  Total subsidence and structural subsidence of mian profile L3

      图  6  典型剖面L1沉降量和构造沉降量曲线

      Fig.  6.  Total subsidence and structural subsidence of mian profile L1

      图  8  万安盆地构造‒沉积充填演化剖面

      以中部凹陷为例

      Fig.  8.  Tectonic-sedimentary evolution process of Wan'an basin

      图  9  万安盆地断陷晚期沉积模式

      Fig.  9.  Sedimentary model of late rifting stage of Wanan basin

      图  10  万安盆地断坳转换期沉积模式

      Fig.  10.  Sedimentary model of rifting-post rifting transitional stage of Wanan basin

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