陆地可控源电磁法探测效果的频率响应

万伟, 唐新功, 黄清华. 2019. 陆地可控源电磁法探测效果的频率响应. 地球物理学报, 62(12): 4846-4859, doi: 10.6038/cjg2019N0069
引用本文: 万伟, 唐新功, 黄清华. 2019. 陆地可控源电磁法探测效果的频率响应. 地球物理学报, 62(12): 4846-4859, doi: 10.6038/cjg2019N0069
WAN Wei, TANG XinGong, HUANG QingHua. 2019. Frequency effect on land CSEM sounding. Chinese Journal of Geophysics (in Chinese), 62(12): 4846-4859, doi: 10.6038/cjg2019N0069
Citation: WAN Wei, TANG XinGong, HUANG QingHua. 2019. Frequency effect on land CSEM sounding. Chinese Journal of Geophysics (in Chinese), 62(12): 4846-4859, doi: 10.6038/cjg2019N0069

陆地可控源电磁法探测效果的频率响应

  • 基金项目:

    国家自然科学基金(41574104,41674107)资助

详细信息
    作者简介:

    万伟, 男, 1989年生, 博士研究生, 研究方向为可控源电磁法正反演及应用研究.E-mail:wanei_py@pku.edu.cn

    通讯作者: 黄清华, 男, 教授, 1990年毕业于中国科学技术大学, 1999年获日本大阪大学博士学位, 主要从事地球电磁学、地震物理学方面的教学与科研工作.E-mail:huangq@pku.edu.cn
  • 中图分类号: P631

Frequency effect on land CSEM sounding

More Information
  • 陆地可控源电磁法的观测资料可依据频段范围近似地划分为近区场、中间区场及远区场,但采用测量相互正交电、磁分量,并计算视电阻率的资料处理方式只适用于远区场数据.为更有效地利用陆地可控源电磁法不同区间场的观测资料,本文结合三维数值模拟技术并采用电场分量直接进行反演的策略,对不同区间电场的响应特征与探测效果进行了分析.数值模拟结果表明:近区电场的异常响应最明显,异常响应不随频率发生显著变化,但纵向分辨能力差;远区电场异常响应随频率发生显著变化,其探测深度取决于频率的高低;中间区场较为复杂,地表电场异常响应的等值线中心并不是位于异常体中心正上方,而是在沿场传播方向上向异常体与围岩的分界面处偏移,并且发现中间区场资料的加入会影响反演结果的准确性.综合合成数据和野外实测资料的反演结果,发现结合近区场和远区场资料而舍弃中间区场资料的反演效果更佳,这为陆地可控源电磁法资料的反演解释提供了一种有效途径.

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  • 图 1 

    三维模型及对应的测点分布图

    Figure 1. 

    3D model and the distribution of the receivers

    图 2 

    依据均匀半空间电场Ex响应特征划分近区场、中间区场以及远区场

    Figure 2. 

    The near-zone field, middle-zone field and far-zone field are divided according to the characteristic of the half-space electric field Ex response

    图 3 

    近区场(0.2 Hz)、中间区场(20 Hz)、远区场(1260 Hz)在地表测区ΔEx与Δψ分布图

    Figure 3. 

    The relative changes of Ex amplitude ΔEx and phase Δψ of different frequencies at different zones for all observation points

    图 4 

    测点A与测点B的ΔEx与Δψ随频率变化曲线

    Figure 4. 

    The relative changes of Ex amplitude (ΔEx) and phase (Δψ) of 3D anomaly model to background layered model at observation points A and B

    图 5 

    剖面x=0 m不同频率的电场矢量图

    Figure 5. 

    Electric field vector of different frequencies at profile x=0 m

    图 6 

    各单频率反演结果(x=0 m)

    Figure 6. 

    Inversion results for the single-frequency at profile x=0 m

    图 7 

    各单频率反演的模型响应数据与合成数据的Ex幅值比

    Figure 7. 

    Amplitude ratio of the Ex between the response data of the inversion model and synthetic data for the single-frequency

    图 8 

    组合不同场区数据的反演结果(剖面x=0 m)

    Figure 8. 

    The inversion results for different frequency combinations at profile x=0 m

    图 9 

    可控源电磁法野外观测布置

    Figure 9. 

    Layout of two field land CSEM observation systems

    图 10 

    基于发射源T2采集各个测点视电阻率

    Figure 10. 

    Apparent resistivity of each observation point based on the transmitter T2

    图 11 

    图 10各测点视电阻率一维反演结果构建的三维电阻率模型

    Figure 11. 

    3D resistivity model constructed by apparent resistivity (Fig. 10) 1D inversion results

    图 12 

    源T1激发下各测点电场Ex幅值

    Figure 12. 

    Ex amplitude of each observation point based on transmitter T1

    图 13 

    参考电阻率模型合成数据反演结果(剖面z=35 m,发射源为T1)

    Figure 13. 

    Synthetic inversion results of the reference model based on transmitter T1 (z=35 m)

    图 14 

    发射源T1激发下观测数据(图 12b)反演结果(剖面z=35 m)

    Figure 14. 

    Inversion results of observation data (Fig. 12b) based on transmitter T1 (z=35 m)

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出版历程
收稿日期:  2019-02-26
修回日期:  2019-07-02
上线日期:  2019-12-05

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