大地电磁六元素张量阻抗理论及其应用

胡祥云; 金钢燮

doi:10.3799/dqkx.2018.317

大地电磁六元素张量阻抗理论及其应用

doi: 10.3799/dqkx.2018.317

胡祥云^1,,
金钢燮^1,2

1.
中国地质大学地空学院, 湖北武汉 430074
2.
金策工业综合大学工程科学中心, 朝鲜平壤 999093

基金项目:

中国地质大学（武汉）地学长江计划 CUGCJ1707

国家自然科学基金项目 41474055

详细信息

作者简介:
胡祥云(1966-), 男, 教授, 主要从事地震层析成像研究

中图分类号: P315
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- 被引次数: 0
出版历程
- 收稿日期: 2018-05-11
- 刊出日期: 2018-10-20

A Trial for Introducing 6-Element Tensor Impedance in Magnetotelluric Method and Its Application

Hu Xiangyun^1
,,
Kim Kangsop^1,2

1.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Center of Engineering Sciences, Kimchaek University of Technology, Pyongyang 999093, DPRK

摘要

摘要: 在经典大地电磁（MT）理论中，张量阻抗[ Z ]定义为电场分量和磁场分量之间的线性关系.估算张量阻抗[ Z ]及和它有关的其他参数（例如视电阻率、相位、倾子等）是MT数据处理中的一个重要环节.引入了六元素张量阻抗[ R ]的全新概念，并开发了相应的处理方法.为检验本方法的特征和抗噪性能，对采集自朝鲜的MT野外资料进行了分析.分析结果表明在MT资料处理中新定义的六元素张量阻抗[ R ]比传统的四分量张量阻抗[ Z ]提高测深曲线的相干度至少0.1以上，并且改善了大地电磁资料处理的质量.
- MT法 /
- 张量阻抗 /
- 信噪比 /
- 地球物理
Abstract: The conventional magnetotelluric method is theoretically based upon definition of impedance tensor[ Z ] and the relationship between the electrical and magnetic components E_x, E_y, H_x, H_y, H_z of MT field, the main purpose of MT data processing is to obtain inpedance tensor, apparent resistivity, phase, tipper, skewness and other parameters. In this paper, we propose the definition of 6-elements tensor impedance and briefly describe its some characteristics and determination techniques in the comparison with the former impedance tensor[ Z ]. Furthermore, we explain the necessity of the proposed method and demonstrate its applicability by some field tests conducted in Democratic People's Republic of Korea.
- magnetotelluric exploration /
- impedance tensor /
- signal to noise ratio /
- geophysics

HTML全文

图 1 在噪声严重的MT测点观测到的电磁场分量之间的相干度曲线

图a为E_x和H_x、H_y、H_z之间相干度；图b为E_y和H_x、H_y、H_z之间相干度

Fig. 1. The curves of coherencies versus frequency number between observed electircal and magnetic components at a MT station

下载: 全尺寸图片幻灯片

图 2 图 1中的MT测点实测电场和用[Z], [R]预测的电场之间的相干度曲线

图a为与E_x有关的相干度；图b为与E_y有关的相干度

Fig. 2. Curves of coherencies between observed and predicted electrical components by using [Z] or [R], respectively at the MT station in Fig. 1

下载: 全尺寸图片幻灯片

图 3 图 1、2中的MT数据用[Z](a)和[R](b)估计的视电阻率ρ_xy、ρ_yx曲线对比

Fig. 3. Comparison of ρ_xy, ρ_yx apparent resistivity curves by the use of [Z](a) and [R](b) at the MT station in Fig. 1, 2

下载: 全尺寸图片幻灯片

图 4 图 2中的MT数据视电阻率ρ_xy, ρ_yx曲线的反演结果对比

图a为实测与正演理论视电阻率曲线, 1, 2分别为用[Z], [R]得到的；图b为反演得到的深度-电阻率模型, 3, 4分别为从1, 2的反演得到的

Fig. 4. Comparison of effective apparent resistivity curves (a) and inverted resitivity models versus depth(b) at the MT station in Fig. 1-3, based on [Z] and [R]

下载: 全尺寸图片幻灯片

表 1 MT时间序列中磁场分量的振幅比较

Table 1. Comparison of amplitudes of magnetic components from MT records

频率段	采样率t(s)	磁场分量平均振幅(mA/m)
频率段	采样率t(s)	H_x	H_y	H_z
1	6.510 4×10^-4	0.562	1.893	0.560
2	1.016 7×10^-2	0.078	0.041	0.063
3	0.166 667	0.183	0.149	0.350
4	2.666 67	6.279	10.748	17.410
平均	1.775	3.208	4.596

下载: 导出CSV

表 2 图 1中的测点E_i(i=x, y)和H_j(j=x, y, z)之间的平均相干度

Table 2. Coherencies between E_i(i=x, y) and H_j(j=x, y, z) components

Coh(E_x, H_x)	Coh(E_x, H_y)	Coh(E_x, H_z)	Coh(E_y, H_x)	Coh(E_y, H_y)	Coh(E_y, H_z)
0.488	0.456	0.409	0.473	0.419	0.405

下载: 导出CSV

表 3 图 1中的MT测点中用[Z]和[R]时E_i, E_i^p之间平均相干度

Table 3. Comparison of coherencies between E_i, E_i^p components when using [Z] and [R]

相干度	Coh(E_x)	Coh(E_y)
[Z]	0.659	0.641
[R]	0.692	0.692

下载: 导出CSV

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