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上海城市水网地区电火花震源地震探测隐伏断裂的应用探索

宋春华 施刚 巫虹 张浩 郁飞

宋春华, 施刚, 巫虹, 等, 2021. 上海城市水网地区电火花震源地震探测隐伏断裂的应用探索. 地质力学学报, 27 (6): 938-948. DOI: 10.12090/j.issn.1006-6616.2021.27.06.076
引用本文: 宋春华, 施刚, 巫虹, 等, 2021. 上海城市水网地区电火花震源地震探测隐伏断裂的应用探索. 地质力学学报, 27 (6): 938-948. DOI: 10.12090/j.issn.1006-6616.2021.27.06.076
SONG Chunhua, SHI Gang, WU Hong, et al., 2021. Application of seismic detection by spark source for concealed faults in Shanghai urban water network area. Journal of Geomechanics, 27 (6): 938-948. DOI: 10.12090/j.issn.1006-6616.2021.27.06.076
Citation: SONG Chunhua, SHI Gang, WU Hong, et al., 2021. Application of seismic detection by spark source for concealed faults in Shanghai urban water network area. Journal of Geomechanics, 27 (6): 938-948. DOI: 10.12090/j.issn.1006-6616.2021.27.06.076

上海城市水网地区电火花震源地震探测隐伏断裂的应用探索

doi: 10.12090/j.issn.1006-6616.2021.27.06.076
基金项目: 

上海市财政重点项目—上海市区域地壳稳定性调查与研究 20-45064

详细信息
    作者简介:

    宋春华(1985-), 男, 高级工程师, 从事城市地质调查、地球物理勘探研究。E-mail: 271797119@qq.com

    通讯作者:

    施刚(1964-), 男, 高级工程师, 从事城市地质调查、水文地质与工程地质学研究。E-mail: 454229705@qq.com

  • 中图分类号: P631.4

Application of seismic detection by spark source for concealed faults in Shanghai urban water network area

Funds: 

the Key Financial Project of Shanghai 20-45064

  • 摘要: 人工地震勘探是目前公认最为有效的城市地区隐伏断裂探测手段之一,但其受限于激发震源和城市高干扰环境背景,在高度城市化区域往往难以获取良好的地震勘探资料。文章通过利用上海市城市水网发育的优势,在大治河水域开展大功率电火花震源激发方式的地震探测,对电火花震源激发能量、放电水深、不同震源的地震成像效果等对比试验,获得了上海地区内河水域(大治河东段)最佳地震勘探激发参数,确认了在城市水网开展电火花震源激发地震勘探方式的有效性。与其他常规激发方式相比,电火花激发地震勘探资料具有较高的信噪比,并且可以达到较深的勘探深度,对城市地区隐伏断裂探测具有良好效果。

     

  • 图  1  试验区位置、基岩地质及测线布置示意图

    a—大治河位置示意图; b—试验区基岩地质及测线布置图

    Figure  1.  Map showing the location of the test area, bedrock geology and layout of the surveylines

    (a)Location map of the test area; (b)Bedrock geology and layout of surveylines in the test area

    图  2  地质-物理剖面速度模型图

    Figure  2.  Model of geological-physical profile velocity

    图  3  能量试验8~60 Hz单炮分频对比图

    Figure  3.  Comparison diagram showing the frequency division of 8~60 Hz single gun in energy tests

    图  4  不同能量试验频谱分析对比图

    Figure  4.  Comparison diagram showing the spectrum in different energy tests

    图  5  不同能量试验子波对比图

    Figure  5.  Comparison diagram of the wavelet in different energy tests

    图  6  不同激发能量地震时间剖面对比图

    a—200 kJ激发能量地震时间剖面对比图; b—400 kJ激发能量地震时间剖面对比图;

    Figure  6.  Comparison of the seismic time profile with different excitation energies

    (a)Comparison of seismic time profile with 200 kJ excitation energy; (b)Comparison of seismic time profile with 400 kJ excitation energy

    图  7  200 kJ、400 kJ激发信噪比估算对比图

    Figure  7.  Comparison of the estimated SNR by 200 kJ and 400 kJ excitation

    图  8  水深试验单炮扫描记录对比图

    Figure  8.  Comparison of the scanning record of single gun in water depth tests

    图  9  不同震源激发地震时间剖面对比图

    a—大功率电火花震源激发地震时间剖面; b—可控震源激发地震时间剖面; c—气枪震源激发地震时间剖面

    Figure  9.  Comparison of the seismic time profile excited by different sources

    (a)Seismic time profile excited by high-power spark source; (b)Seismic time profile excited by vibroseis; (c)Seismic time profile excited by air gun source

    图  10  电火花震源激发地震时间剖面反射波层位解释图

    Figure  10.  Horizon interpretation of the reflected wave in seismic time profile excited by spark source

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  • 收稿日期:  2020-07-01
  • 修回日期:  2020-12-23
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