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断层附近地应力扰动带宽度及其影响因素

翁剑桥 曾联波 吕文雅 刘奇 祖克威

翁剑桥, 曾联波, 吕文雅, 等, 2020. 断层附近地应力扰动带宽度及其影响因素. 地质力学学报, 26 (1): 39-47. DOI: 10.12090/j.issn.1006-6616.2020.26.01.004
引用本文: 翁剑桥, 曾联波, 吕文雅, 等, 2020. 断层附近地应力扰动带宽度及其影响因素. 地质力学学报, 26 (1): 39-47. DOI: 10.12090/j.issn.1006-6616.2020.26.01.004
WENG Jianqiao, ZENG Lianbo, LYU Wenya, et al., 2020. Width of stress disturbed zone near fault and its influencing factors. Journal of Geomechanics, 26 (1): 39-47. DOI: 10.12090/j.issn.1006-6616.2020.26.01.004
Citation: WENG Jianqiao, ZENG Lianbo, LYU Wenya, et al., 2020. Width of stress disturbed zone near fault and its influencing factors. Journal of Geomechanics, 26 (1): 39-47. DOI: 10.12090/j.issn.1006-6616.2020.26.01.004

断层附近地应力扰动带宽度及其影响因素

doi: 10.12090/j.issn.1006-6616.2020.26.01.004
基金项目: 

石油化工联合基金项目 U1663203

国家科技重大专项 2016ZX05003-001

详细信息
    作者简介:

    翁剑桥(1990-), 男, 地质实验工程师, 从事地质实验、地应力方面研究工作。E-mail:wengjianqiao@yeah.net

    通讯作者:

    曾联波(1967-), 男, 长江学者特聘教授, 现从事天然裂缝和非常规油气储层地质力学方面科研教学工作。E-mail:lbzeng@sina.com

  • 中图分类号: TU45;P553

Width of stress disturbed zone near fault and its influencing factors

  • 摘要: 在建立正断层模型的基础上,利用三维有限元数值模拟方法研究了断层附近地层中的地应力变化规律。其结果表明,由于断层活动,在断层附近普遍发育应力扰动带;在应力扰动带范围内,地应力方向和大小发生明显的变化,断层中部附近应力值普遍较低,而断层端部的应力值通常异常增大。应力扰动带的分布范围主要受断层规模的控制,与断裂带的岩石力学性质、断层走向、断层面形态和边界应力条件等因素也密切相关。随断层长度和断距逐步增大,应力扰动带的宽度相应增加。断裂带的岩石越破碎,其岩石弹性模量越低,断层对地应力的影响宽度越大。断层走向与区域最大水平主应力方向越接近垂直、断距与断层长度的比值越大,区域内的差应力越大,则扰动带宽度与断层规模的比值也越大。选择渤海湾盆地BZ-X油田进行验证,在建立油田实际三维地质模型基础上,根据边界应力条件,利用三维有限元方法对沙河街组二段的地应力分布进行了数值模拟计算。根据断层周围的地应力变化,确定了应力扰动带的分布范围,断层附近应力扰动带宽度的分布规律与正断层模型分析结果相一致。

     

  • 图  1  三维正断层模型

    Figure  1.  3D normal fault model

    图  2  围岩中应力状态

    Figure  2.  In-situ stress state in surrounding rocks

    图  3  断层附近地应力扰动带宽度变化规律

    Figure  3.  Variation rule of fault disturbed zone's width

    图  4  断层附近地应力扰动带宽度的影响因素

    Figure  4.  Controlling factors of fault disturbed zone's width

    图  5  BZ-X油田沙二段断层附近地应力扰动带平面分布图

    Figure  5.  Horizontal distribution of fault disturbed zones in Es2, BZ-X Oilfield

    图  6  BZ-X油田沙二段断层附近地应力扰动带宽度变化规律

    Figure  6.  Variation rule of fault disturbed zone's width in Es2, BZ-X Oilfield

    表  1  断层模型参数

    Table  1.   Fault model parameters

    模型序号 断层 岩石力学性质 边界应力条件
    L/km D/L θ/(°) E1/GPa V1 E2(GPa) V2 σh/MPa σH/MPa
    初始0 0.2 0.01 45 0.7 0.25 3.5 0.2 50 65
    系列1 0.2~20 0.01 45 0.7 0.25 3.5 0.2 50 65
    系列2 0.2 0.001~1 45 0.7 0.25 3.5 0.2 50 65
    系列3 0.2 0.01 0~90 0.7 0.25 3.5 0.2 50 65
    系列4 0.2 0.01 45 0.35~2.8 0.2~0.3 3.5 0.2 50 65
    系列5 0.2 0.01 45 0.7 0.25 3.5 0.2 37.5~65 65
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  • 收稿日期:  2018-11-21
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