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    松辽盆地中部后裂谷早期正断层系形成机制

    龚发雄 单业华 林舸 李自安 刘士林

    龚发雄, 单业华, 林舸, 李自安, 刘士林, 2008. 松辽盆地中部后裂谷早期正断层系形成机制. 地球科学, 33(4): 547-554.
    引用本文: 龚发雄, 单业华, 林舸, 李自安, 刘士林, 2008. 松辽盆地中部后裂谷早期正断层系形成机制. 地球科学, 33(4): 547-554.
    GONG Fa-xiong, DAN Ye-hua, LIN Ge, LI Zi-an, LIU Shi-lin, 2008. Mechanism of Early Post-Rift Normal Faults in the Central Songliao Basin, Northeastern China. Earth Science, 33(4): 547-554.
    Citation: GONG Fa-xiong, DAN Ye-hua, LIN Ge, LI Zi-an, LIU Shi-lin, 2008. Mechanism of Early Post-Rift Normal Faults in the Central Songliao Basin, Northeastern China. Earth Science, 33(4): 547-554.

    松辽盆地中部后裂谷早期正断层系形成机制

    基金项目: 

    中国科学院“百人计划”启动项目 KZCX0543081001

    国家自然科学基金面上项目 40672144

    详细信息
      作者简介:

      龚发雄(1981—), 男, 在读博士, 主要从事盆地构造及构造数值模拟研究.E-mail:gongfaxiong@yahoo.com.cn

    • 中图分类号: P631.4; P618.130.2

    Mechanism of Early Post-Rift Normal Faults in the Central Songliao Basin, Northeastern China

    • 摘要: 在松辽盆地后裂谷早期的沉积地层里广泛发育着一个长度相对短、走向变化相对大的正断层系.大庆太平屯区块高精度三维地震勘探结果的构造研究表明, 该层伸展率可达0.0594±0.0209, 由此向上或向下发生明显的减少.这与裂谷盆地地层的伸展率自下而上一般呈单调递减是不一致的, 意味着单纯的区域拉伸不能够解释这种反常现象.笔者认为在成岩过程中沉积物可能发生的体积收缩应该是导致这种伸展率异常的主要原因.文中分析了造成体积收缩的3种可能机制: 生烃、伊利石化脱水和压实收缩, 其中最主要的是压实收缩机制.此外, 构造应力场也明显地影响着该断层系的形成, 造成断层走向分布具有一定的方向性.

       

    • 图  1  研究区的位置(a); T1、T2、和T3反射层断层迹线图(b, c, d); 走向玫瑰花园(e, f, g)

      断层迹线图中的实线和虚线分别代表着NW-SE (实线) 和E-W (虚线) 2个方向上的伸展量测量线

      Fig.  1.  Location of the study area (a), and fault trace maps (b, c, d) and their rosettes (e, f, g) in seismic reflection layers T1, T2, and T3

      图  2  太平屯区块T1、T2、T2-3y、T3和T4反射层的断层长度频率图

      Fig.  2.  Fault length frequency diagrams in the seismic reflection layers T1, T2, T2-3y, T3 and T4 in Taipingtun block

      图  3  NW-SE (实线) 和E-W (虚线) 2个方向上不同反射层位的实测应变范围及平均值

      Fig.  3.  The range of extensional strain and its average value measured in NW-SE and E-W directed scan lines in the different layers

      图  4  Mackunda地区多边形断层系迹线图(Watterson, 2000)

      Fig.  4.  The traces of polygonal faults in the Mackunda zone (Watterson, 2000)

      图  5  Cartwright and Lonergan (1996)的压实收缩模型

      在该模型中岩层两侧被固定, 变形层被限定在垂向上变化.在这种情况下, 正断层发育的唯一的途径是原始的层长在压实过程中收缩, 层长的收缩平衡了因断层形成而产生的伸展应变

      Fig.  5.  A model of volumetric contraction proposed by Cartwright and Lonergan (1996)

      图  6  不同压缩比下泥岩横向收缩率与埋深的关系

      虚线框是T2-3y反射层的现今埋深和应变测量值的约束范围

      Fig.  6.  Relationship between lateral shortening ratio and burial depth for variable ratio of horizontal to vertical shortening in contraction

      表  1  研究区不同反射层不同测线(图 1b-1d) 上获得的伸展率

      Table  1.   Extensional strain measured along the scan lines (see Fig. 1b-1d) in the seismic reflection layers in the study area

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    • 收稿日期:  2007-07-26
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