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    刚果扇盆地上中新世深水水道充填结构及演化特征

    刘新颖 于水 陶维祥 胡孝林 郝立华

    刘新颖, 于水, 陶维祥, 胡孝林, 郝立华, 2012. 刚果扇盆地上中新世深水水道充填结构及演化特征. 地球科学, 37(1): 105-112. doi: 10.3799/dqkx.2012.010
    引用本文: 刘新颖, 于水, 陶维祥, 胡孝林, 郝立华, 2012. 刚果扇盆地上中新世深水水道充填结构及演化特征. 地球科学, 37(1): 105-112. doi: 10.3799/dqkx.2012.010
    LIU Xin-ying, YU Shui, TAO Wei-xiang, HU Xiao-lin, HAO Li-hua, 2012. Filling Architecture and Evolution of Upper Miocene Deep-Water Channel in Congo Fan Basin. Earth Science, 37(1): 105-112. doi: 10.3799/dqkx.2012.010
    Citation: LIU Xin-ying, YU Shui, TAO Wei-xiang, HU Xiao-lin, HAO Li-hua, 2012. Filling Architecture and Evolution of Upper Miocene Deep-Water Channel in Congo Fan Basin. Earth Science, 37(1): 105-112. doi: 10.3799/dqkx.2012.010

    刚果扇盆地上中新世深水水道充填结构及演化特征

    doi: 10.3799/dqkx.2012.010
    基金项目: 

    "十二五"国家科技重大专项 2011ZX05030-003

    详细信息
      作者简介:

      刘新颖(1981-),男,工程师,博士,主要从事沉积与储层相关研究工作.E-mail:liuxy10@cnooc.com.cn

    • 中图分类号: TE122

    Filling Architecture and Evolution of Upper Miocene Deep-Water Channel in Congo Fan Basin

    • 摘要: 深水水道作为深水油气勘探的主力储层,其内部结构及演化特征的研究对于深水油气田勘探和开发都具有非常重要的意义.基于钻井及3D地震资料,对刚果扇盆地上中新世深水水道的内部充填期次、结构和演化特征进行了分析.从层序地层学的角度出发,将研究区内的水道划分为多个不同级别层序格架内形成的水道单体和水道复合体,从而对切谷内部的水道期次和组成特征进行精细表述.研究表明,研究区内水道单体自下而上发育底部滞留、滑塌充填、侵蚀水道、加积水道、天然堤和废弃水道6种沉积微相类型,整体表现为流体能量逐步降低的过程;三级水道复合体形成于复杂的多期侵蚀-充填过程,受到海平面变化、坡度及重力流流变学特征的影响,纵向演化可划分为初始侵蚀、初始充填、加积充填、后期充填和水道废弃5个阶段,各阶段切谷内充填结构和水道平面展布特征呈现有规律的变化.

       

    • 图  1  刚果扇演化及研究区上中新统水道平面展布

      Fig.  1.  Evolution of the Congo Fan and distribution of the Miocene channel in the study area

      图  2  研究区水道层序及期次划分(剖面以上新统底拉平,位置见图 1)

      Fig.  2.  Division of sequence and epoch of channel in the study area

      图  3  T-1井单井层序划分及微相特征

      1.泥质粉砂岩; 2.粉砂岩; 3.砂岩; 4.砂泥质碎屑流; 5.砂质砾岩; 6.泥基质砾岩; 7.砂基质砾岩; 8.波状交错层理; 9.斜层理; 10.平行层理; 11.块状; 12.正粒序递变; 13.反粒序递变; 14.侵蚀面; 15.水平/垂向侵入; 16.包卷层理; 17.砂质包卷; 18.泥质变形; 19.砾; 20.外源砂质碎屑; 21.外源碎屑; 22.砂质漂砾; 23.变形泥砾; 24.泥质漂砾; 25.定向排量; ①泥; ②泥质粉砂; ③粉砂; ④砂; ⑤细砾; ⑥中砾; ⑦粗砾

      Fig.  3.  Sequence division and microfacies character of well T-1

      图  4  研究区3Ⅱ水道复合体演化特征

      Fig.  4.  Evolution of channel complex 3Ⅱ in the study area

      表  1  研究区水道单体沉积微相特征

      Table  1.   Microfacies character of individual channel in the study area

      微相类型 岩性 沉积构造 厚度 测井曲线 地震反射特征
      底部滞留 粉砂质泥岩或砂岩基质下混杂的粗砂、砾石、泥砾 混杂的块状,层理不明显 <5 m 低幅度齿状箱型 不连续弱振幅
      滑塌充填 泥质粉砂岩、泥岩为主,局部含粗碎屑或泥砾 变形相关构造层理,局部见砂层侵入 <10 m 低幅度齿状 不连续弱振幅
      侵蚀-充填水道 块状细砂至粗砂、砂砾岩为主;含砾级外源碎屑颗粒 正粒序递变层理、斜层理、平行层理、粗颗粒定向排列 10 cm至10 m 高幅度箱型或齿化箱型 不连续的中、强振幅
      加积水道 泥质粉砂岩夹薄层砂岩,局部含砾级外源碎屑颗粒 变形相关构造层理,可见砂岩侵入 几十m 中高幅指状或齿状箱型 不连续的强振幅
      废弃水道 泥质粉砂岩夹薄层砂岩 正粒序层序层理、平行层理、泄水构造 几十m 低幅度齿状曲线 中连续的中、强振幅
      天然堤 泥质粉砂岩中夹分米级别细砂岩、粉砂岩薄层 波状层理、平行层理、正粒序递变层理、砂质包卷层理 中幅度指状或齿状曲线 连续性好的中、强振幅,平行、亚平行发射
      下载: 导出CSV
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    • 收稿日期:  2011-06-23
    • 刊出日期:  2012-01-15

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