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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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

Received: 05 July 2021 Published: 21 June 2022

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	Articles by authors
	Zhong-Ping LI
	Feng-Yun HAO
	Hong-Fei WU
	Rui-Fang ZHANG
	Zhao-Ming ZHU
	Quan-Shan JIA
	Shuang LIU

Cite this article:

Zhong-Ping LI,Feng-Yun HAO,Hong-Fei WU, et al. A data decoupling analysis of different devices in time-domain IP sounding[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 722-728.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1373 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/722

Schematic diagram of transmitting dipole AB and receiving dipole MN on uniform half space

Device type, maximum power supply pole distance and electrode arrangement

Results after decoupling of measured data of time domain IP sounding of symmetrical quadrupole device (AB_max=4 000 m) in section 28 of Jinchang mining area of Yinan Gold Mine

Results after decoupling of measured data of time domain IP sounding of monopole dipole device in Section 7 of copper mine in Xiajiagou area

Comparison of standard deviation of inversion results before and after different AB decoupling in symmetrical quadrupole IP sounding of section 28

Comparison of standard deviations of inversion results before and after decoupling of unconventional electrode IP soundings on section 28 and point 1079.47

Comparison of the standard deviation of the inversion results before and after the decoupling of the monopole-dipole IP sounding on section 7 and point -20

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

Comparison of inversion results before decoupling and after decoupling standard deviation fluctuation statistics

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