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    松辽盆地盆西斜坡白垩系姚家组下切谷充填结构

    辛仁臣 李桂范 向淑敏

    辛仁臣, 李桂范, 向淑敏, 2008. 松辽盆地盆西斜坡白垩系姚家组下切谷充填结构. 地球科学, 33(6): 834-842.
    引用本文: 辛仁臣, 李桂范, 向淑敏, 2008. 松辽盆地盆西斜坡白垩系姚家组下切谷充填结构. 地球科学, 33(6): 834-842.
    XIN Ren-chen, LI Gui-fan, XIANG Shu-min, 2008. The Incised Valley Filling Architecture of Cretaceous Yaojia Formation in the Western Clinoform of Songliao Basin. Earth Science, 33(6): 834-842.
    Citation: XIN Ren-chen, LI Gui-fan, XIANG Shu-min, 2008. The Incised Valley Filling Architecture of Cretaceous Yaojia Formation in the Western Clinoform of Songliao Basin. Earth Science, 33(6): 834-842.

    松辽盆地盆西斜坡白垩系姚家组下切谷充填结构

    基金项目: 

    国家自然科学基金项目 40272057

    详细信息
      作者简介:

      辛仁臣(1964-), 男, 博士, 副教授, 主要从事含油气盆地地质研究. E-mail:xinrenchen@163.com

    • 中图分类号: P59

    The Incised Valley Filling Architecture of Cretaceous Yaojia Formation in the Western Clinoform of Songliao Basin

    • 摘要: 白垩纪青山口组沉积末期至姚家组沉积初期,松辽盆地发生了湖平面大幅度下降,湖区大规模萎缩,形成了SSQq-qn和SSQy-n之间的二级层序界面.这一时期,西部斜坡普遍暴露,缺失了三级层序SQqn4和SQy1地层,并在齐齐哈尔古水系的作用下在西部斜坡的北部形成了下切谷.下切谷长约70km,宽约20km,呈NW-SE延伸.在SQy23层序水进域,下切谷逐渐被充填.下切谷发育区SQy23水进域的地层厚度明显高于相邻区域,在沉积走向上的高地层厚度梯度带反映了下切谷的边界.下切谷充填序列具有多期旋回性特征,一个完整的短期充填旋回的底界为侵蚀面,侵蚀面之上依次发育泥砾岩、具交错层理含陆源砾石和泥砾中-细粒砂岩、具波纹层理粉砂质泥岩和泥岩.充填下切谷的不同短期旋回的砂体在空间上具有叠瓦状结构.在倾向剖面上,砂体沿下切谷底界面逐层叠置超覆,向盆地方向分叉并尖灭在泥岩中,反映了河-湖共同作用.在横剖面上,砂体呈透镜状错叠.早期的砂体主要发育于相对深谷部位,相对高部位以泥质充填为主,后期的砂体不受原始深谷限制.在SQy23最大湖泛期,下切谷内以泥质充填为主.

       

    • 图  1  松辽盆地构造分区及研究区位置(据高瑞祺和蔡希源, 1997, 改编)

      Fig.  1.  Study area and division of structural units of Songliao basin

      图  2  松辽盆地中部含油组合高精度层序地层格架(据高瑞祺等, 1994; 叶得泉等, 2002, 改编)

      Fig.  2.  The high-resolution sequence stratigraphic framework of the middle oil-bearing beds of Songliao basin

      图  3  松辽盆地西部斜坡SQy23水进域地层等厚图

      Fig.  3.  Isopach map of the transgressive system tract of SQy23 of the western clinoform of Songliao basin

      图  4  杜71井下切谷充填序列(钻井的平面位置见图 3)

      Fig.  4.  The filled sequence of the incised valley, Well Du71

      图  5  杜71井下切谷充填沉积物岩心照片

      a.916.0 m, 浅灰绿色泥砾岩, 中砂填隙; b.915.0 m, 含泥砾细砂岩, 具交错层理

      Fig.  5.  The core photographs from the filled deposition of downcutting valley, Well Du71

      图  6  富718-杜412顺倾向下切谷充填结构断面图

      (剖面位置见图 3中①)

      Fig.  6.  The architecture map of the dip-profile (Well Fu718-Well Du412) of the incised valley

      图  7  杜12井-杜82井下切谷横剖面充填结构断面图

      (剖面位置见图 3中②)

      Fig.  7.  The architecture map of the strike profile (Well Dul2 Well Du82) of the incised valley

      图  8  江34井-江62井下切谷横剖面充填结构断面图

      (剖面位置见图 3中③)

      Fig.  8.  The architecture map of the strike profile (Well Jiang34-Well Jiang62) of the incised valley

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    • 收稿日期:  2008-02-28
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