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基于重、磁数据的珠江口盆地构造格局研究

何泽洋 白志钊 王万银 李林致 张义蜜 陈莹 何涛 马瑞云

何泽洋,白志钊,王万银,等. 基于重、磁数据的珠江口盆地构造格局研究[J]. 海洋学报,2023,45(12):25–43 doi: 10.12284/hyxb2023165
引用本文: 何泽洋,白志钊,王万银,等. 基于重、磁数据的珠江口盆地构造格局研究[J]. 海洋学报,2023,45(12):25–43 doi: 10.12284/hyxb2023165
He Zeyang,Bai Zhizhao,Wang Wanyin, et al. Tectonic framework research in Zhujiang River Mouth Basin based on gravity and magnetic data[J]. Haiyang Xuebao,2023, 45(12):25–43 doi: 10.12284/hyxb2023165
Citation: He Zeyang,Bai Zhizhao,Wang Wanyin, et al. Tectonic framework research in Zhujiang River Mouth Basin based on gravity and magnetic data[J]. Haiyang Xuebao,2023, 45(12):25–43 doi: 10.12284/hyxb2023165

基于重、磁数据的珠江口盆地构造格局研究

doi: 10.12284/hyxb2023165
基金项目: 中海油研究总院有限责任公司科技项目(CCL2021RCPS1067KQN)。
详细信息
    作者简介:

    何泽洋(2000—),男,安徽省六安市人,博士研究生,研究方向为重、磁方法理论及应用。 E-mail:2021026001@chd.edu.cn

    通讯作者:

    王万银(1962—),男,博士,教授,博士生导师,主要从事重、磁位场理论及应用研究和教学工作。E-mail: wwy7902@chd.edu.cn

  • 中图分类号: P736.12

Tectonic framework research in Zhujiang River Mouth Basin based on gravity and magnetic data

  • 摘要: 珠江口盆地位于南海北部大陆边缘,横跨了华南大陆架、大陆坡以及洋陆过渡带地区,其构造演化十分复杂。随着勘探程度的加深,珠江口盆地的边界也一直发生着变化,盆地南部边界存在争议。本文基于卫星重力异常数据和磁力异常数据,重新研究了珠江口盆地的断裂及火成岩分布,并以高精度地震数据为约束反演了研究区新生界深度,根据处理的结果对研究区构造单元进行了调整。研究结果显示,研究区的NEE、NE和NW向断裂较为发育,且在本次研究中新识别出4条断裂;火成岩平面位置整体走向为NEE向,但不同区域走向存在区别:在盆地西部有近EW向火成岩,盆地中部火成岩为NWW向,而盆地东部火成岩部分为近EW向;在构造单元中将阳江凹陷根据重力和新生界特征分成了阳江西凹陷和阳江东凹陷,并删去了文昌D凹陷和文昌E凹陷。NW向的北卫滩断裂与阳江−一统断裂一起将盆地分为西部、中部和东部3个部分,此3个部分的断裂走向、火成岩平面位置和新生界厚度及构造单元都有所不同。本次同时对珠江口盆地断裂、火成岩和构造单元进行研究,旨在对后续盆地研究和油气突破提供地球物理支撑。
  • 图  1  南海北部陆缘断裂系统(图中黑底白线所围区域为珠江口盆地,引自文献[31])

    Fig.  1  The regional tectonic background in the northern South China Sea (The region enclosed by the white line with the black background in the figure is the Zhujiang River Mouth Basin, according to reference [31])

    图  2  珠江口盆地重磁基础及处理

    a. 珠江口盆地地形;b. 珠江口盆地卫星测高重力异常;c. 珠江口盆地布格重力异常;d. 珠江口盆地磁力异常,黑框部分为航磁数据;e. 珠江口盆地化极磁力异常

    Fig.  2  The basic and gravity and magnetic in Zhujiang River Mouth Basin

    a. The topograph of the Zhujiang River Mouth Basin; b. the free-air gravity disturbances of the Zhujiang River Mouth Basin; c. the Bouguer gravity disturbances of the Zhujiang River Mouth Basin; d. the magnetic anomalies of the Zhujiang River Mouth Basin, the black box shows the airborne magnetic data; e. RTP of magnetic anomalies of the Zhujiang River Mouth Basin

    图  3  前人划分断裂与布格重力异常 NVDR-THDR 叠合(a),黑色实线引自文献[3]剖面;布格重力异常 NVDR-THDR 与地质剖面叠合(b)

    Fig.  3  Superposed of previous faults division and NVDR-THDR of Bouguer gravity anomalies (a), the black line is the profile according to reference [3]; superposed of NVDR-THDR of Bouguer gravity anomalies and geological profile (b)

    图  4  珠江口盆地断裂与布格 NVDR-THDR 叠合(a);珠江口盆地剩余布格重力异常与断裂叠合(b)

    Fig.  4  Superposed of faults division and NVDR-THDR of Bouguer gravity anomalies of Zhujiang River Mouth Basin (a); superposed of faults division and residual Bouguer gravity anomalies of Zhujiang River Mouth Basin (b)

    图  5  珠江口盆地断裂统计

    a. 珠江口盆地断裂走向及长度玫瑰花图;b. 珠江口盆地断裂走向与频数玫瑰花图;c. 珠江口盆地断裂长度及频数直方图

    Fig.  5  Statistical of faults in Zhujiang River Mouth Basin

    a. The rose diagram of faults strike and length in Zhujiang River Mouth Basin; b. the rose diagram of faults strike and frequency in Zhujiang River Mouth Basin; c. histogram of fault length and frequency in Zhujiang River Mouth Basin

    图  6  控凹断裂与地质剖面对应关系(据文献[39])

    Fig.  6  The relationship between sag controlled faults and geological profile (according to reference [39])

    图  7  珠江口盆地剩余化极磁力异常(a)和珠江口盆地剩余布格重力异常 VDR 图(b)

    Fig.  7  The map of the residual RTP magnetic anomalies in Zhujiang River Mouth Basin (a) and the map of the VDR of the residual Bouguer anomolies in Zhujiang River Mouth Basin (b)

    图  8  珠江口盆地火成岩岩性及与前人对比(对比文献[26])(a)和珠江口盆地火成岩视深度(b)

    Fig.  8  The horizontal distribution of igneous compare with others in Zhujiang River Mouth Basin (according to reference [26]) (a) and the top depth of igneous rocks in Zhujiang River Mouth Basin (b)

    图  9  珠江口盆地新生界底界面深度(a)和珠江口盆地新生界厚度(b)

    Fig.  9  The depth of the bottom interface of Cenozoic in the Zhujiang River Mouth Basin (a) and the Cenozoic thickness of the Zhujiang River Mouth Basin (b)

    图  10  珠江口盆地新生界深度与地震剖面对比,上图为 AA′剖面,下图为 EE′剖面(据文献[3])

    Fig.  10  Cenozoic depth and seismic profiles comparison of the Zhujiang River Mouth Basin, the above picture is the profile AA′, the below picture is the profile EE′ (according to reference [3])

    图  11  珠江口盆地构造单元划分结果

    Fig.  11  The division results of construction units in the Zhujiang River Mouth Basin

    图  12  珠江口盆地构造单元对比(a)和图a中黑框部分剩余布格重力异常(b)

    橙底白线为原构造单元,紫底白线为本次划分的构造单元

    Fig.  12  The comparison of structural units in Zhujiang River Mouth Basin (a) and the black box with residual Bouguer gravity anomlies in figure a (b)

    The white line with orange background is the former structural units, the white line with magneta background is the structural units of this division

    图  13  珠江口盆地火成岩平面分布与断裂叠合(a)和珠江口盆地新生界厚度与断裂叠合(b)

    Fig.  13  Superposed of horizontal distribution of igneous rocks and faults in Zhujiang River Mouth Basin (a) and superposed of horizontal distribution of igneous rocks and faults in Zhujiang River Mouth Basin (b)

    图  14  珠江口盆地构造格局叠合

    Fig.  14  The overlay of tectonic framework of Zhujiang River Mouth Basin

    表  1  珠江口盆地控盆断裂统计表

    Tab.  1  The statistic of basin-control faults in Zhujiang River Mouth Basin

    断裂编号 断裂走向 断裂性质[7] 断裂属性 与前人识别对比
    F1-1(滨外断裂带) NEE, NE 拉张 地壳断裂 与前人识别位置一致
    F1-2(海南岛东部断裂) NNE 拉张 地壳断裂 与前人识别位置一致
    F1-3(阳江–一统断裂带) NW 走滑 基底断裂 与前人识别位置略有差异
    F1-4(西沙海槽断裂) 近EW, NE 拉张 地壳断裂 与前人识别位置一致
    F1-5 近SN 拉张 地壳断裂 与前人识别位置略有差异
    F1-6(北卫滩断裂带) NW 走滑 基底断裂 与前人识别位置略有差异
    下载: 导出CSV

    表  2  珠江口盆地控凹断裂统计表

    Tab.  2  The statistic of sag-control faults in Zhujiang River Mouth Basin

    断裂编号 断裂走向 断裂性质[7, 34] 断裂属性 与前人识别对比
    F2-1 NEE 拉张 盖层断裂 与前人识别位置相同
    F2-2 NE−NEE 拉张 盖层断裂 与前人识别位置相同
    F2-3(珠三南断裂) NEE 拉张 盖层断裂 与前人识别位置相同
    F2-4 NEE−NE 拉张 盖层断裂 与前人识别位置相同
    F2-5 NEE 拉张 盖层断裂 与前人识别位置相同
    F2-6 NNE 拉张 盖层断裂 穿过珠一坳陷东部,为本次新识别断裂
    F2-7 NNE, NE 拉张 盖层断裂 比前人识别位置更长
    F2-8 NNE 拉张 盖层断裂 与前人识别位置相同
    F2-9 NNE 拉张 盖层断裂 与前人识别位置相同
    F2-10 NNE 拉张 盖层断裂 为本次新识别断裂
    F2-11 NE−NNE 拉张 盖层断裂 与前人识别位置存在差异
    F2-12 NE−NNE 拉张 盖层断裂 与前人识别位置相同
    F2-13 NE 拉张 盖层断裂 与前人识别位置略有差异
    F2-14 NEE 拉张 基底断裂 与前人识别位置略有区别
    F2-15 NE−NEE 拉张 基底断裂 与前人识别位置相同
    F2-16(神狐隆起西断裂) NW 走滑 基底断裂 与前人识别位置存在一定差异
    F2-17 NW 走滑 基底断裂 与前人识别位置具有一定差异
    F2-18 NW 走滑 基底断裂 与前人识别位置相同
    F2-19 NW 走滑 基底断裂 与前人识别位置相同
    F2-20 NWW 走滑 盖层断裂 与前人识别位置相同
    F2-21 NWW 走滑 盖层断裂 与前人识别位置相同
    F2-22 NNW 走滑 基底断裂 与前人识别位置具有一定差异
    F2-23 NNW 走滑 盖层断裂 与前人识别位置相同
    F2-24 NNW, NW 走滑 盖层断裂 为本次新识别断裂
    F2-25 NE 拉张 盖层断裂 为本次新识别断裂
    F2-26 NE 拉张 盖层断裂 与前人识别位置相同
    下载: 导出CSV

    表  3  珠江口盆地火成岩分类及新生界钻井揭示火成岩特征表(据文献[26])

    Tab.  3  Classification of igneous rocks in Zhujiang River Mouth Basin and the features of igneous rocks revealed by Cenozoic drillings (according to reference [26])

    二级构造单元钻井岩石特征识别结果
    恩平凹陷玄武岩夹凝灰岩高密高磁
    西江凹陷玄武岩低密低磁、高密高磁、高密低磁、低密高磁
    惠州凹陷英安斑岩、安山岩低密低磁、低密高磁
    惠陆低凸起凝灰岩、安山岩、安山质凝灰岩、玄武岩高密高磁、低密高磁
    陆丰凹陷粗面岩、流纹质/英安质凝灰岩、火山岩、角砾岩低密低磁、高密高磁、高密低磁、低密高磁
    海丰凹陷角砾岩、凝灰岩高密高磁、高密低磁
    韩江凹陷玄武岩、玄武质凝灰岩高密高磁、低密低磁、低密高磁
    云开低凸起凝灰岩夹玄武岩、火山角砾岩、安山质凝灰熔岩低密高磁、高密高磁、低密低磁
    白云凹陷凝灰岩高密低磁、低密低磁、低密高磁、高密高磁
    阳春凹陷流纹质凝灰熔岩低密高磁、低密低磁
    阳江低凸起玄武岩低密高磁
    文昌A凹陷凝灰岩高密低磁
    文昌B凹陷英安斑流岩、蚀变珍珠岩低密高磁、低密低磁
    番禺低隆起玄武岩高密高磁、低密高磁、高密低磁、低密低磁
    东沙隆起玄武岩、流纹质凝灰岩、凝灰岩、凝灰熔岩、集块岩高密高磁、低密高磁、高密低磁、低密低磁
    下载: 导出CSV
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  • 收稿日期:  2023-05-04
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