浅海瞬变电磁全波形响应特征及探测能力分析

赵越, 许枫, 李貅, 鲁凯亮. 2019. 浅海瞬变电磁全波形响应特征及探测能力分析. 地球物理学报, 62(4): 1526-1540, doi: 10.6038/cjg2019L0780
引用本文: 赵越, 许枫, 李貅, 鲁凯亮. 2019. 浅海瞬变电磁全波形响应特征及探测能力分析. 地球物理学报, 62(4): 1526-1540, doi: 10.6038/cjg2019L0780
ZHAO Yue, XU Feng, LI Xiu, LU KaiLiang. 2019. Exploration capability of transmitter current waveform on shallow water TEM response. Chinese Journal of Geophysics (in Chinese), 62(4): 1526-1540, doi: 10.6038/cjg2019L0780
Citation: ZHAO Yue, XU Feng, LI Xiu, LU KaiLiang. 2019. Exploration capability of transmitter current waveform on shallow water TEM response. Chinese Journal of Geophysics (in Chinese), 62(4): 1526-1540, doi: 10.6038/cjg2019L0780

浅海瞬变电磁全波形响应特征及探测能力分析

  • 基金项目:

    国家自然科学基金项目(61801470)与中国科学院声学研究所"青年英才计划"项目(QNYC201729)共同资助

详细信息
    作者简介:

    赵越, 女, 1989年生, 博士, 研究方向为瞬变电磁法理论与应用.E-mail:zhaoyue_0430@126.com

    通讯作者: 许枫, 男, 1969年生, 研究员, 博士生导师, 研究方向为水下目标探测与成像.E-mail:xf@mail.ioa.ac.cn
  • 中图分类号: P631

Exploration capability of transmitter current waveform on shallow water TEM response

More Information
  • 瞬变电磁法在浅海工程勘探等领域受到了越来越多的关注.目前浅海瞬变电磁仍处于应用初期,相关研究少且未有成熟装备问世,有必要研究其探测能力并为观测系统选取最佳观测参数.本文以几种典型发射波形为例,采用褶积算法细致分析了不同发射波形条件下浅海瞬变电磁on-/off-time响应受海底介质电导率、磁导率及发射波形脉宽等参数的影响特征与规律;通过三维正演并设定极限探测深度阈值,进一步分析不同发射波形on-/off-time期间浅海瞬变电磁探测能力及对典型三维目标体的极限探测深度.基于本文研究成果,可为浅海瞬变电磁探测装置设计、观测系统的参数选取及试验参数的选取等提供了一些有价值的理论借鉴.

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  • 图 1 

    一维层状海底地质模型示意图

    Figure 1. 

    Sketch map of 1D layered sea geological model

    图 2 

    不同海水深度影响下海洋瞬变电磁归一化响应曲线对比图

    Figure 2. 

    The normalized dBz/dt response for different seawater depth.

    图 3 

    半正弦波全时响应结果与齐彦福等(2017)计算结果对比图

    Figure 3. 

    Comparison of the TEM response for a half-sine transmitting wave and its relative errors

    图 4 

    四种常见发射电流波形

    Figure 4. 

    Schematic plot of typical transmitter current waveform

    图 5 

    发射电流波形频谱特征

    Figure 5. 

    Spectrum analysis in different transmitter current waveform

    图 6 

    Bz与dBz/dt时间域全波形响应随沉积层电性变化曲线

    Figure 6. 

    Full-wave TEM response of shallow sea with different transmitter current waveform

    图 7 

    Bz和dBz/dt时间域全波形响应随磁导率变化曲线

    Figure 7. 

    Full-wave TEM response of shallow sea with different magnetic permeability

    图 8 

    不同脉宽条件下全域视电阻率曲线

    Figure 8. 

    Apparent resistivity of shallow sea TEM with different pulse width

    图 9 

    3D模型示意图

    Figure 9. 

    A 3D model with single abnormal body

    图 10 

    单个异常体3D模型TEM响应结果图

    Figure 10. 

    Results of the 3-D model with an abnormal body

    图 11 

    不同发射波形探测深度对比

    Figure 11. 

    Exploration depth of dBz/dt and Bz responses with different transmitter current waveform

    图 12 

    不同关断时间条件下梯形波发射Bz与dBz/dt响应随掩埋深度变化曲线

    Figure 12. 

    Bz and dBz/dt response of trapezoid transmitter current waveform with different turn-off time

    表 1 

    不同发射波形dBz/dtBz响应探测深度

    Table 1. 

    Exploration depth of dBz/dt and Bz response for different transmitter current waveform

    探测深度/m 方波 梯形波(Δ1=0.2 ms) 梯形波(Δ1=0.5 ms) 梯形波(Δ1=1.0 ms) 三角波 半正弦波
    On-time dBz/dt 6.596 6.304 5.951 5.492 6.618 6.750
    Off-time dBz/dt 6.286 6.305 6.354 6.416 6.471 6.469
    On-time Bz 7.153 7.127 7.070 6.776 6.715 7.265
    Off-time Bz 7.296 7.337 7.345 7.373 7.394 7.371
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出版历程
收稿日期:  2017-12-21
修回日期:  2018-12-03
上线日期:  2019-04-05

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