大地电磁电场远参考道法适用条件及应用效果

doi:10.13810/j.cnki.issn.1000-7210.2023.06.021

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Abstract The remote reference method is effective for processing magnetotelluric （MT） time series data.It is generally believed that magnetic fields yield better effects as reference channels，but electric fields are not suitable as remote reference channels due to their susceptibility to underground structures.Based on actual data processing，this paper explores the utilization of electric fields as reference channels for processing MT data and finds that they perform well in the high-frequency range above 1 Hz but poorly in the low-frequency range.Then，it puts forward a new approach that employs electric fields as reference channels for processing high-frequency data.Fine processing of audio magnetotelluric （AMT） data confirms the validity of electric fields as reference channels in the high-frequency range （> 1 Hz）.Application of this approach to AMT data processing indicates that the results obtained by adopting electric fields as reference channels are comparable to those by utilizing magnetic fields as reference channels，with sound improvement in data processing of AMT “dead band”（1k~5k Hz）.AMT data collection typically involves multiple measurement points sharing a set of magnetic channels，and the electric channel number greatly exceeds that of magnetic channels.Thus，processing of remote reference channel electric fields can significantly improve AMT data processing results and can be popularized as a conventional processing method.Analysis of natural source electromagnetic fields and MT dimensionality parameters shows that the limited influence of high-frequency electric fields on underground structures is the underlying reason for the remote reference channel data effectiveness of electric fields.This research also provides guidance for the location selection of remote reference stations，suggesting that the stations should be situated in areas with simple geoelectric structures to minimize interference of underground electrical structures on natural electromagnetic field signals from the same source as the survey area.

Key words： magnetotelluric remote reference method electric field audio magnetotelluric impedance tensor

Received: 18 August 2022

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P631

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	WANG Peijie
	CHEN Xiaobin
	ZHANG Yunyun
	YANG Jing
	DONG Zeyi

Cite this article:

WANG Peijie,CHEN Xiaobin,ZHANG Yunyun等. Applicable conditions and effects of remote reference method of magnetotelluric electric field[J]. OGP, 2023, 58(6): 1489-1498.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.06.021 OR http://www.ogp-cn.com/EN/Y2023/V58/I6/1489

[1]	杨博,张祥国,刘展,等.基于聚类和多元地质统计学的电—震联合建模约束反演技术及应用[J].石油地球物理勘探,2021,56(3): 670-677.YANG Bo,ZHANG Xiangguo,LIU Zhan,et al.Technique and application of joint magnetotelluric and seismic modeling and constrained inversion based on clustering and multivariate geostatistics[J].Oil Geophysical Prospecting,2021,56(3): 670-677.
[2]	曾志文,陈晓,郭冬,等.双种群人工蜂群算法及其在MT和重力联合反演中的应用[J].石油地球物理勘探,2021,56(6): 1400-1408,1447.ZENG Zhiwen,CHEN Xiao,GUO Dong,et al.Dual-population artificial bee colony algorithm and its application in joint inversion of magnetotelluric and gravity data[J].Oil Geophysical Prospecting,2021,56(6): 1400-1408,1447.
[3]	张振宇,胡祥云,王刚,等.内蒙古狼山成矿带深部地质结构特征[J].石油地球物理勘探,2022,57(4): 982-991.ZHANG Zhenyu,HU Xiangyun,WANG Gang,et al.Characteristics of deep geological structure of Langshan metallogenic belt in Inner Mongolia[J].Oil Geophysical Prospecting,2022,57(4): 982-991.
[4]	SIMS W E,BOSTICK F X,SMITH H W.The estimation of magnetotelluric impedance tensor elements from measured data[J].Geophysics,1971,36(5): 938-942.
[5]	GAMBLE T D,GOUBAU W M,CLARKE J.Magnetotellurics with a remote magnetic reference[J].Geophysics,1979,44(1): 53-68.
[6]	GAMBLE T D,GOUBAU W M,CLARKE J.Error analysis for remote reference magnetotellurics[J].Geophysics,1979,44(5): 959-968.
[7]	GOUBAU W M,GAMBLE T D,CLARKE J.Magnetotelluric data analysis: removal of bias[J].Geophysics,1978,43(6): 1157-1166.
[8]	GOUBAU W M,MAXTON P M,KOCH R H,et al.Noise correlation lengths in remote reference magnetotellurics[J].Geophysics,1984,49(4): 433-438.
[9]	EGBERT G D,BOOKER J R.Robust estimation of geomagnetic transfer functions[J].Geophysical Journal of the Royal Astronomical Society,1986,87(1): 173-194.
[10]	CHAVE A D,THOMSON D J,ANDER M E.On the robust estimation of power spectra,coherences,and transfer functions[J].Journal of Geophysical Research,1987,92(B1): 633-648.
[11]	CHAVE A D,THOMSON D J.Some comments on magnetotelluric response function estimation[J].Journal of Geophysical Research,1989,94(B10): 14215-14225.
[12]	CHAVE A D,THOMSON D J.A bounded influence regression estimator based on the statistics of the hat matrix[J].Journal of the Royal Statistical Society,Series C: Applied Statistics,2003,52(3): 307-322.
[13]	CHAVE A D,THOMSON D J.Bounded influence magnetotelluric response function estimation[J].Geophysical Journal International,2004,157(3): 988-1006.
[14]	张赟昀,王培杰,陈小斌,等.强干扰环境下的大地电磁时间序列处理过程[J].地震地质,2022,44(3): 786-801.ZHANG Yunyun,WANG Peijie,CHEN Xiaobin,et al.Magnetotelluric time series processing in strong interference environment[J].Seismology and Geology,2022,44(3): 786-801.
[15]	陈清礼,胡文宝,苏朱刘,等.长距离远参考大地电磁测深试验研究[J].石油地球物理勘探,2002,37(2): 145-148.CHEN Qingli,HU Wenbao,SU Zhuliu,et al.Study for long-distant and far-referential MT[J].Oil Geophysical Prospecting,2002,37(2): 145-148.
[16]	严良俊,胡文宝,陈清礼,等.远参考MT方法及其在南方强干扰地区的应用[J].江汉石油学院学报,1998,20(4): 34-38.YAN Liangjun,HU Wenbao,CHEN Qingli,et al.Application of remote reference MT to noisy area[J].Journal of Jianghan Petroleum Institute,1998,20(4): 34-38.
[17]	周聪,汤井田,原源,等.大地电磁多参考站阵列数据处理方法[J].石油地球物理勘探,2020,55(6): 1373-1382.ZHOU Cong,TANG Jingtian,YUAN Yuan,et al.Mutil-reference array MT data processing method[J].Oil Geophysical Prospecting,2020,55(6): 1373-1382.
[18]	CONSTABLE C G,CONSTABLE S C.Satellite Magnetic Field Measurements: Applications in Studying the Deep Earth[M].State of the Planet: Frontiers and Challenges in Geophysics Frontiers and Challenges in Geophysics,AGU,Washington DC,2004.
[19]	GARCIA X,JONES A G.Atmospheric sources for audio-magnetotelluric (AMT) sounding[J].Geophysics,2002,67(2): 448-458.
[20]	蔡军涛,陈小斌,赵国泽.大地电磁资料精细处理和二维反演解释技术研究(一)——阻抗张量分解与构造维性分析[J].地球物理学报,2010,53(10): 2516-2526.CAI Juntao,CHEN Xiaobin,ZHAO Guoze.Refined techniques for data processing and two-dimensional inversion in magnetotelluric Ⅰ: tensor decomposition and dimensionality analysis[J].Chinese Journal of Geophysics,2010,53(10): 2516-2526.