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围压下裂隙对地震波速度影响的物理实验研究

赵卫华 王红才 魏建新 孙东生 李阿伟

赵卫华, 王红才, 魏建新, 等, 2016. 围压下裂隙对地震波速度影响的物理实验研究. 地质力学学报, 22 (4): 967-975.
引用本文: 赵卫华, 王红才, 魏建新, 等, 2016. 围压下裂隙对地震波速度影响的物理实验研究. 地质力学学报, 22 (4): 967-975.
ZHAO Wei-hua, WEI Jian-xin, SUN Dong-sheng, et al., 2016. STUDY ON SEISMIC PROPERTY OF CRACK-INCLUDED PHYSICAL MODEL. Journal of Geomechanics, 22 (4): 967-975.
Citation: ZHAO Wei-hua, WEI Jian-xin, SUN Dong-sheng, et al., 2016. STUDY ON SEISMIC PROPERTY OF CRACK-INCLUDED PHYSICAL MODEL. Journal of Geomechanics, 22 (4): 967-975.

围压下裂隙对地震波速度影响的物理实验研究

基金项目: 

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

详细信息
    作者简介:

    赵卫华(1984-), 男, 硕士, 主要从事岩石物理学、岩石力学及地应力等研究工作。E-mail:weihuazhao@163.com

  • 中图分类号: P315.3

STUDY ON SEISMIC PROPERTY OF CRACK-INCLUDED PHYSICAL MODEL

  • 摘要: 构建了等直径不同裂隙密度和等裂隙密度不同裂隙直径两组物理模型,进行不同围压条件下多方向的超声波速度测试,并运用Hudson理论进行了理论模型计算。结果显示,计算与实测结果吻合较好。随围压的增大,纵、横波速度均近线性增加,纵、横波各向异性基本保持不变;裂隙密度从2%增大到6%,纵波速度不同程度降低,其中慢纵波降低幅度相对较大,快横波变化不明显,而慢横波则大幅降低。随着裂隙密度的增大,纵、横波各向异性均增大,且横波各向异性增加速率大于纵波;裂隙直径从2 mm增大到3 mm,快纵波速度增加很小,慢纵波增加明显,横波速度均不发生改变。随着裂隙直径的增大,纵波各向异性逐渐降低,横波各向异性保持不变。最后结合试验结果分析了Hudson理论在不同深度进行参数预测的必要条件。研究结果有助于油气生产、地下水的开采与控制、污染处理等。

     

  • 图  1  样品裂隙分布与XYZ分布示意图

    Figure  1.  Simplified diagram of distribution of crack and X Y Z

    图  2  样品Z04实测纵、横波速度随围压的变化

    Figure  2.  The measured Vp and Vs varying with the confining pressure (Sample Z04)

    图  3  样品Z02实测与计算纵、横波速度随围压的变化

    Figure  3.  The measured and calculated Vp and Vs varying with the confining pressure (Sample Z02)

    图  4  直径2 mm的3种裂隙密度模型纵、横波速度随围压的变化

    Figure  4.  Vp and Vs of 3 samples (crack diameter 2 mm) with different crack density varying with confining pressure

    图  5  直径2 mm的3种裂隙密度模型纵、横波各向异性随围压的变化

    Figure  5.  Vp and Vs anisotropy of 3 samples (crack diameter 2 mm) with different crack density varying with confining pressure

    图  6  围压25 MPa直径2 mm的3种模型纵、横波各向异性随裂隙密度的变化

    Figure  6.  Anisotropy of 3 samples varying with crack density (crack diameter 2 mm, confining pressure 25 MPa)

    图  7  裂隙密度4%的3种直径模型纵、横波速度随围压的变化

    Figure  7.  Vp and Vs of 3 samples with different diameter varying with confining pressure(crack density 4%)

    图  8  裂隙密度4%的3种直径模型纵、横波各向异性随围压的变化

    Figure  8.  Vp and Vs anisotropy of 3 samples with different crack diameters varying with confining pressure (Crack density 4%)

    图  9  围压25 MPa裂隙密度4%的3种模型纵、横波各向异性随裂隙直径的变化

    Figure  9.  Anisotropy of 3 samples varying with crack diameters (Crack density 4%, confining pressure 25MPa)

    表  1  样品参数信息

    Table  1.   Sample parameters

    样品编号直径/mm高度/mm裂隙密度/%裂隙直径/mm密度/(g·cm-3)
    M025.4037.12--1.109
    M1-125.3847.480-1.174
    Z02X25.3243.26221.168
    Z02Y25.4248.82221.180
    Z02Z25.4243.46221.174
    Z04X25.4247.84421.176
    Z04Y25.4447.66421.176
    Z04Z25.4247.52421.175
    Z06X25.4049.42621.166
    Z06Y25.4249.56621.178
    Z06Z25.4247.36621.177
    Z08X25.4245.7442.51.169
    Z08Y25.4047.0242.51.176
    Z08Z25.4248.8242.51.171
    Z10X25.4249.02431.173
    Z10Y25.4248.16431.176
    Z10Z25.4047.74431.175
    下载: 导出CSV
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  • 收稿日期:  2016-06-20
  • 刊出日期:  2016-12-28

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