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    南海北部陆缘超伸展区白云凹陷断陷结构演化与岩浆作用

    庞雄 郑金云 任建业 王福国 颜晖 孙辉 柳保军

    庞雄, 郑金云, 任建业, 王福国, 颜晖, 孙辉, 柳保军, 2022. 南海北部陆缘超伸展区白云凹陷断陷结构演化与岩浆作用. 地球科学, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064
    引用本文: 庞雄, 郑金云, 任建业, 王福国, 颜晖, 孙辉, 柳保军, 2022. 南海北部陆缘超伸展区白云凹陷断陷结构演化与岩浆作用. 地球科学, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064
    Pang Xiong, Zheng Jinyun, Ren Jianye, Wang Fuguo, Yan Hui, Sun Hui, Liu Baojun, 2022. Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea. Earth Science, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064
    Citation: Pang Xiong, Zheng Jinyun, Ren Jianye, Wang Fuguo, Yan Hui, Sun Hui, Liu Baojun, 2022. Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea. Earth Science, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064

    南海北部陆缘超伸展区白云凹陷断陷结构演化与岩浆作用

    doi: 10.3799/dqkx.2022.064
    基金项目: 

    国家科技重大专项“大型油气田及煤层气开发” 2016ZX05026-003

    国家科技重大专项“大型油气田及煤层气开发” 2011ZX05025-003

    中海石油有限公司科技项目 YXKY-2012-SHENHAI-01

    中海石油(中国)有限公司“十三五”科技重点项目 CNOOC-KJ135ZDXM37SZ01SHENHAI

    详细信息
      作者简介:

      庞雄(1962-), 男, 教授级高级工程师, 长期从事珠江口盆地深水油气勘探研究.ORCID: 0000-0002-7510-2488.E-mail: pangxiong@cnooc.com.cn

    • 中图分类号: P618.13

    Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea

    • 摘要: 断陷盆地的结构-构造主要受控于边界断层的构造作用,但是在盆地发育过程中有不同程度的岩浆作用发生时,断陷结构会受到显著的改造和影响.通过对位于南海北部陆缘超伸展区的珠江口盆地白云凹陷断陷结构差异演化特征的描述和分析,探讨陆缘伸展过程中岩浆作用的参与程度对洼陷结构样式和断陷构造-地层-沉积演化的影响.研究表明,白云凹陷主洼强烈伸展期间,岩浆作用不明显,上地壳发生脆性断裂,中下地壳则发生韧性伸展薄化,产生了壳幔拆离断层控制的宽深断陷,构造作用即地壳伸展拆离薄化作用是断陷发育的主要机制;然而,白云凹陷东部洼陷在经历了早期的脆性破裂之后,随即发生了显著的岩浆上涌作用,改变了上地壳的结构强度,脆-韧性转换面上移,产生了上地壳拆离断层控制的宽浅断陷,断陷结构受岩浆上涌作用的改造而表现出坡坪式拆离断层控制的半地堑系,沉积中心发生规律性迁移,构造-岩浆作用是断陷发育的机制.白云凹陷主洼与白云凹陷东部洼陷中岩浆作用参与程度的不同,不仅导致了洼陷结构样式及其演变过程的不同,而且断陷中的沉积充填体系也表现出显著的差异.构成白云凹陷主洼的宽深断陷中发育了巨厚的中晚始新世上文昌组-恩平组,在北部缓坡和南部深洼区,这套地层依次由大型三角洲体系和深湖相沉积体系构成;白云凹陷的东部洼陷则受岩浆上涌改造,发育多隆凹结构的宽浅断陷,形成多个小物源供源的小型三角洲-浅湖沉积体系,而且沉积物中富含火山碎屑.研究成果对于白云凹陷成盆机制的研究意义重大,同时对该凹陷的油气勘探亦具有重要的实际应用价值.

       

    • 图  1  珠江口盆地地层柱状图

      Fig.  1.  Stratigraphic histogram of the Pearl River Mouth Basin

      图  2  南海北部陆缘白云凹陷结晶地壳厚度图(a)和断陷期地层厚度、控洼断裂分布图(b)

      Fig.  2.  Crustal thickness map (a) and stratum thickness, boundary fault map in rifting stage (b) of the Baiyun Sag in the northern continental margin of South China Sea

      图  3  白云凹陷主洼断陷结构(NE向)

      Fig.  3.  The profile of depression architecture in the main depression of the Baiyun Sag

      图  4  白云凹陷主洼断陷结构(SE向)

      Fig.  4.  The profile of depression architecture in the main depression of the Baiyun Sag

      图  5  白云凹陷L4井(a)和L6井(b)年代地层综合图

      Fig.  5.  Comprehensive biochronostratigraphic map of Well L4 (a) and Well L6 (b) in the Baiyun Sag

      图  6  白云凹陷东部断陷结构剖面

      Fig.  6.  The profile of depression architecture in the eastern depression of the Baiyun Sag

      图  7  白云凹陷东部断陷结构(据庞雄等,2021修改)

      Fig.  7.  The profile of depression architecture in the eastern depression of the Baiyun Sag (modified from Pang et al., 2021)

      图  8  白云凹陷沉积充填结构剖面

      Fig.  8.  The profile of depositional filling architecture in the Baiyun Sag

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