水平电偶极源层状模型垂直磁场全区视电阻率计算方法

doi:10.11720/wtyht.2019.0325

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摘要

利用水平电偶极源层状模型电磁场公式系统计算了不同收发距、不同层状地电模型的电磁场分量,给出了由循环互相关法辨识出频率响应,并计算全区视电阻率的方法。利用水平电场E_x分量和垂直磁场H_z分量计算了全区视电阻率,与层状模型大地电磁测深卡尼亚视电阻率和可控源音频大地电磁测深卡尼亚视电阻率进行比较,水平电场E_x分量和垂直磁场H_z分量全区视电阻率均能很好地反映出地电特征,且垂直磁场H_z分量全区视电阻率与层状模型大地电磁测深卡尼亚电阻率在低频段有相似的频率响应特征。对于大埋深基底,H_z分量全区视电阻率在小收发距条件下就能有较好的响应。垂直磁场分量进入近区的频率低于水平电场进入近区的频率,更有利于在小收发距条件下进行大深度勘探。

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	伏海涛
	罗维斌
	丁志军
	余其林
	张世宽

关键词 ：水平电偶极源, 层状模型, 垂直磁场, 水平电场, 全区视电阻率

Abstract：

Using the electromagnetic field formula of horizontal electric dipole source on the surface of layered model, the authors calculate electromagnetic field components of different transmitting and receiving distances and different layered geoelectric models systematically. The method for identifying frequency response by circular cross-correlation method and calculating the whole zone apparent resistivity is given. The apparent resistivity of the whole zone is calculated by using the E_x component of horizontal electric field and the H_z component of vertical magnetic field. Compared with the Cagniard apparent resistivity of layered model of magnetotelluric sounding and the Cagniard apparent resistivity of controlled source audio magnetotelluric sounding, the whole zone apparent resistivity of E_x component of horizontal electric field and the H_z component of vertical magnetic field can well reflect the geoelectric characteristics. Moreover, the whole zone apparent resistivity of the vertical magnetic field with the H_z component has similar frequency response characteristics with the Cagniard resistivity of the layered model of magnetotelluric sounding in low frequency band. As for deep buried basement, the whole zone apparent resistivity of the H_z component can respond well under the condition of small transceiver distance. The frequency of the vertical magnetic field component entering the near zone is lower than that of the horizontal electric field entering the near zone, which proves the proposed means is more conducive to deep exploration under the condition of small transceiver distance.

Key words： horizontal electric dipole source layered model vertical magnetic field horizontal electric field apparent resistance of the whole region

收稿日期: 2019-06-24 出版日期: 2019-11-28

P631

基金资助:国家自然科学基金项目“相关辨识技术在谱激电中的应用研究”(41374185);中国地震局地震科技星火计划联合资助(XH18046)

通讯作者: 罗维斌

作者简介: 伏海涛(1968-),男,学士学位,主要从事电磁法勘探方面的应用研究工作。Email:1034796069@qq.com

引用本文:

伏海涛, 罗维斌, 丁志军, 余其林, 张世宽. 水平电偶极源层状模型垂直磁场全区视电阻率计算方法[J]. 物探与化探, 2019, 43(6): 1309-1319.
Hai-Tao FU, Wei-Bin LUO, Zhi-Jun DING, Qi-Lin YU, Shi-Kuan ZHANG. The calculation method of whole zone apparent resistivity of vertical magnetic field on the surface of layered model excited by horizontal electric dipole source. Geophysical and Geochemical Exploration, 2019, 43(6): 1309-1319.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0325 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I6/1309

Fig.1 水平电偶极源层状地电模型

Table 1 D型地电模型参数

Fig.2 水平电偶源D型地电模型全区视电阻率频谱

Table 2 G型地电模型参数

Fig.3 水平电偶源G型地电模型全区视电阻率频谱

Table 3 H型地电模型参数

Fig.4 水平电偶源H型地电模型全区视电阻率频谱

Table 4 K型地电模型参数

Fig.5 水平电偶源K型地电模型全区视电阻率频谱

Table 5 KH型地电模型参数

Fig.6 水平电偶源KH型地电模型不同收发距全区视电阻率频谱

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