时间域激电测深不同装置数据去耦分析

doi:10.11720/wtyht.2022.1373

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摘要

为消除激电测深中的电磁耦合干扰,根据频率域和时间域可相互转换的理论,采用静态IP和cole-cole参数的全波形IP、延时反演去耦方法,实现了快速去耦,最大限度地保留了激电信息。以山东沂南金矿金场矿区等为例,对时间域激电测深数据进行了去耦前反演与去耦后反演,结果表明:对称四极装置和非常规电极排列的电磁耦合效应随电极距的增大而增强,电磁耦合的影响深度大部分在时间域激电测深反演断面150 m以浅;非常规电极排列采用三极+四极+偶极混合共线装置,其产生的电磁耦合干扰明显大于对称四极装置和单极—偶极装置;非共线单极—偶极装置的时间域激电测深电磁耦合影响较小。

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	李忠平
	郝风云
	吴鸿飞
	张瑞芳
	朱昭明
	贾全山
	刘双

关键词 ：时间域激电测深, 电磁感应耦合, 去耦, 测深装置, 沂南金矿

Abstract：

This study aims to eliminate the electromagnetic coupling interference in IP sounding. Based on the theory that frequency-and time-domain data can be mutually converted, this study achieved rapid decoupling while retaining the IP information to the greatest extent by using decoupling methods including static IP inversion, the full waveform IP inversion of Cole-Cole parameters, and delay inversion. This study investigated a gold deposit in Yinan County, Shandong Province and conducted the inversion of time-domain IP sounding data before and after decoupling. The results are as follows. The electromagnetic coupling effect of symmetrical quadrupole devices and unconventional electrode array increases with an increase in the distance between adjacent electrodes, and its influencing depth is mostly less than 150 m in the inversion results of time-domain IP sounding; the electromagnetic coupling interference produced by the unconventional electrode array that adopts a collinear device of dislocation multipoles (tripoles, quadrupoles, and dipoles) is apparently greater than that of symmetrical quadrupole devices and monopole-dipole devices; noncollinear monopole-dipole devices generate slight electromagnetic coupling effect in the process of time-domain IP sounding.

Key words： time-domain IP sounding electromagnetic coupling decoupling sounding device Yinan gold mine

收稿日期: 2021-07-05 修回日期: 2021-10-04 出版日期: 2022-06-20

ZTFLH:

P631

基金资助:中国地质调查局危机矿山接替资源找矿项目(200637035)

作者简介: 李忠平(1965-),男,教授级高级工程师,主要从事矿产物探生产研究工作。Email: xjywt@163.com

引用本文:

李忠平, 郝风云, 吴鸿飞, 张瑞芳, 朱昭明, 贾全山, 刘双. 时间域激电测深不同装置数据去耦分析[J]. 物探与化探, 2022, 46(3): 722-728.
LI Zhong-Ping, HAO Feng-Yun, WU Hong-Fei, ZHANG Rui-Fang, ZHU Zhao-Ming, JIA Quan-Shan, LIU Shuang. A data decoupling analysis of different devices in time-domain IP sounding. Geophysical and Geochemical Exploration, 2022, 46(3): 722-728.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1373 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I3/722

Fig.1 均匀半空间上发射偶极子AB和接收偶极子MN示意

Table 1 装置类型、最大供电极距、电极排列方式

Fig.2 沂南金矿金场矿区28号剖面对称四极装置(AB_max=4 000 m)时间域激电测深实测数据去耦后结果

Fig.3 夏家沟地区铜矿7号剖面单极—偶极装置时间域激电测深实测数据去耦前后结果

Fig.4 28号剖面对称四极激电测深不同AB去耦前后的反演结果标准差对比

Fig.5 28号剖面及其1079.47测点非常规电极排列激电测深去耦前后反演结果标准差对比

Fig.6 7号剖面及其-20测点单极—偶极激电测深去耦前后反演结果标准差对比

装置类型	最大供电极距/m	去耦前反演结果相对去耦后反演结果标准偏差与二者平均值的百分比/%
装置类型	最大供电极距/m	$电阻率最小值最大值平均值$			$极化率最小值最大值平均值$
对称四极	AB=1200	0.01	16.16	3.89	0	141.4	3.29
对称四极	AB=1800	0.19	18.49	4.53	0	141.5	3.72
对称四极	AB=4000	0	29.75	4.11	0	141.5	4.25
非常规	AB=4000	0.03	28.42	5.49	0	141.5	17.79
单极—偶极	隔离系数n=19,MN=50 m	0.04	9.59	3.43	0	13.99	0.87

Table 2 去耦前反演与去耦后反演结果对比标准差波动统计结果

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