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    白云-荔湾凹陷珠江组大型深水水道体系沉积特征及成因机制

    廖计华 徐强 陈莹 王颖 蔡露露 邹梦君 曾清波 焦振华

    廖计华, 徐强, 陈莹, 王颖, 蔡露露, 邹梦君, 曾清波, 焦振华, 2016. 白云-荔湾凹陷珠江组大型深水水道体系沉积特征及成因机制. 地球科学, 41(6): 1041-1054. doi: 10.3799/dqkx.2016.086
    引用本文: 廖计华, 徐强, 陈莹, 王颖, 蔡露露, 邹梦君, 曾清波, 焦振华, 2016. 白云-荔湾凹陷珠江组大型深水水道体系沉积特征及成因机制. 地球科学, 41(6): 1041-1054. doi: 10.3799/dqkx.2016.086
    Liao Jihua, Xu Qiang, Chen Ying, Wang Ying, Cai Lulu, Zou Mengjun, Zeng Qingbo, Jiao Zhenhua, 2016. Sedimentary Characteristics and Genesis of the Deepwater Channel System in Zhujiang Formation of Baiyun-Liwan Sag. Earth Science, 41(6): 1041-1054. doi: 10.3799/dqkx.2016.086
    Citation: Liao Jihua, Xu Qiang, Chen Ying, Wang Ying, Cai Lulu, Zou Mengjun, Zeng Qingbo, Jiao Zhenhua, 2016. Sedimentary Characteristics and Genesis of the Deepwater Channel System in Zhujiang Formation of Baiyun-Liwan Sag. Earth Science, 41(6): 1041-1054. doi: 10.3799/dqkx.2016.086

    白云-荔湾凹陷珠江组大型深水水道体系沉积特征及成因机制

    doi: 10.3799/dqkx.2016.086
    基金项目: 

    国家自然科学基金项目 41172123

    国家“十三五”科技重大专项项目 2016ZX05026

    详细信息
      作者简介:

      廖计华(1984-),男,工程师,博士,主要从事沉积相与油气储层综合研究及相关工作.E-mail: liaojh2@cnooc.com.cn

    • 中图分类号: P618.13

    Sedimentary Characteristics and Genesis of the Deepwater Channel System in Zhujiang Formation of Baiyun-Liwan Sag

    • 摘要: 深水水道体系是近年来在白云-荔湾凹陷东缘珠江组上段深海泥岩背景中新发现的大型深水沉积体系,但是其沉积特征、沉积过程与主控因素尚不清楚.综合利用大量二维、三维地震数据以及钻井、测井资料,揭示了白云-荔湾凹陷东缘珠江组大型深水水道体系的沉积要素构成、外部几何形态、内部充填结构及其沉积演化.在此基础上,进一步探讨了物源供给、陆架坡折带、古地貌对深水水道体系的控制作用,明确了其主控因素,提出了“源貌共控”的成因机制.研究表明珠江组大型深水水道体系由水道、天然堤和朵叶3种沉积要素构成,并以水道为主体.从北至南可依次细分为白云凹陷段、南部隆起段和荔湾凹陷段,其中白云凹陷段以侵蚀型水道为主,南部隆起段以侵蚀-加积型水道为主,荔湾凹陷段以加积型水道为主,在空间上构成了重力流流体能量逐级递减的“三级水道”充填演化特征.3个分段水道内部均可识别出两期水道事件,且充填样式各具特征.珠江组深水水道体系的发育与展布受北部珠江三角洲体系、陆架坡折带和限制性地貌3大因素共同控制.

       

    • 图  1  珠江口盆地构造区划及珠江组大型深水水道体系的位置

      ①、②、③、④、⑤ 为图 3中剖面的位置,⑥ 为图 11中剖面的位置

      Fig.  1.  Tectonic framework of Pearl River Mouth basin and the regional location of the deepwater channel system in Zhujiang Formation

      图  2  白云凹陷深水区地层综合柱状图

      庞雄等(2008)修改

      Fig.  2.  Comprehensive stratigraphic column in deepwater area of Baiyun sag

      图  3  深水水道体系沉积结构要素识别及其地震反射特征

      剖面①、②、③、④、⑤ 的位置见图 1

      Fig.  3.  Recognition of depositional elements and their seismic reflection characteristics of the deepwater channel system in Zhujiang Formation

      图  4  深水水道体系平面展布形态及分段性特征

      a1和a2为珠江组上段层间均方根振幅属性图,其中a1来自三维地震数据,a2来自二维地震数据;b为深水水道体系外部形态及分段性解释,其中⑦~ 为图 5中剖面位置

      Fig.  4.  Geometric shape and segmentation of the deepwater channel system in Zhujiang Formation

      图  5  深水水道体系典型剖面形态及分段性特征

      剖面⑦~ 的位置见图 4

      Fig.  5.  Typical morphological characteristics in profiles and segmentation of the deepwater channel system

      图  6  深水水道体系不同分段单个水道的宽度与厚度关系

      Fig.  6.  Relations of width and thickness of each single channel in different segments of the deepwater channel system

      图  7  白云凹陷段侵蚀型水道典型地震相(a)和内部充填样式(b)

      剖面⑨ 的位置见图 4

      Fig.  7.  Typical seismic facies (a), deposition filling pattern (b) of erosional channel in Baiyun sag segment of the deepwater channel system

      图  8  白云凹陷段侵蚀型水道内部充填地震反射结构(a)及测井解释特征(b)

      剖面⑧ 的位置见图 4

      Fig.  8.  Seismic reflection configuration (a), logging interpretation (b) of the internal filling of erosional channel in Baiyun sag segment

      图  9  南部隆起段侵蚀-加积型水道典型地震相(a)和内部充填样式(b)

      剖面的位置见图 4

      Fig.  9.  Typical seismic facies (a), deposition filling pattern (b) of erosional-aggradational channel in southern uplift segment of the deepwater channel system

      图  10  荔湾凹陷段加积型水道典型地震相(a)和内部充填样式(b)

      剖面的位置见图 4

      Fig.  10.  Typical seismic facies (a), deposition filling pattern (b) of aggradational channel in Liwan sag segment of the deepwater channel system

      图  11  陆架坡折带对深水水道体系的控制

      剖面⑥ 的位置见图 1

      Fig.  11.  The controlling effect of shelf slope-break on the deepwater channel system

      图  12  限制性古地形对深水水道体系发育与展布的控制

      Fig.  12.  The controlling effect of restricted paleotopography on the formation and distribution of deepwater channel system

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