ZHOU Cong1,2, TANG Jingtian3,4, YUAN Yuan1, DENG Juzhi1, SHI Fusheng1, LI Yong2
1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, Jiangxi 330013, China; 2. Key Laboratory of Geophysical Electromagnetic Probing Technologies, Ministry of Natural Resources, Langfang, Hebei 065000, China; 3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha, Hunan 410083, China; 4. Technical Innovation Center of Coverage Area Deep Resources Exploration, Ministry of Natural Resources, Hefei, Anhui 230001, China
Abstract：Rational use of multiple remote reference station data is an important way to improve the quality of magnetotelluric data processing.Based on a processing model of electromagnetic array,a data processing algorithm based on multiple reference stations is proposed in this paper.Firstly,select multiple remote reference stations from both inside and outside the measured area and construct a re-ference data array dominated by natural fields,then extract the polarization parameters of natural sources from the reference data array by robust principal component analysis; and finally apply the parameters to the target array,which is constructed by data from the stations to deal with,and estimate the target tensor impedance through robust estimation.A case study on real data with MT "dead band" distortions indicates that the algorithm proposed in this paper is more effective than conventional methods.The results show that the processing method based on multiple remote reference array stations can improve the quality of MT data processing in a strongly noisy environment and provide a feasible solution to correct MT data with "dead band" distortions.
汤井田,任政勇,周聪,等.浅部频率域电磁勘探方法综述[J].地球物理学报,2015,58(8):2681-2705.TANG Jingtian,REN Zhengyong,ZHOU Cong,et al.Frequency-domain electromagnetic methods for exploration of the shallow subsurface:A review[J].Chinese Journal of Geophysics,2015,58(8):2681-2705.
[2]
胡华,严良俊,何幼斌,等.慈利-保靖断裂带大地电磁测深研究[J].石油地球物理勘探,2018,53(4):865-874.HU Hua,YAN Liangjun,HE Youbin,et al.Tectonic characteristics of Cili-Baojing fault zone based on MT data[J].Oil Geophysical Prospecting,2018,53(4):865-874.
[3]
曹小玲,刘开元,严良俊.大地电磁的小波变换-独立分量分析去噪[J].石油地球物理勘探,2018,53(1):206-213.CAO Xiaoling,LIU Kaiyuan,YAN Liangjun.Magnetotelluric data de-noising based on wavelet transform and independent component analysis[J].Oil Geophy-sical Prospecting,2018,53(1):206-213.
[4]
李桐林,刘福春,韩英杰,等.50万伏超高压输电线的电磁噪声的研究[J].长春科技大学学报,2000,30(1):80-83.LI Tongling,LIU Fuchun,HAN Yingjie,et al.The study of electromagnetic noise created by high voltage transmission line[J].Journal of Changchun University of Science & Technology,2000,30(1):80-83.
[5]
Junge A.Characterization of and correction for cultural noise[J].Surveys in Geophysics,1996,17(4):361-391.
[6]
Goubau W M,Gamble T D,Clarke J.Magnetotelluric data analysis:removal of bias[J].Geophysics,1978,43(6):1157-1166.
[7]
Gamble T,Goubau W M,Clarke J.Magnetotellurics with a remote magnetic reference[J].Geophysics,1979,44(1):53-68.
[8]
熊识仲.远参考道大地电磁测深的实际应用[J].石油地球物理勘探,1990,25(5):594-599.XIONG Shizhong.Application of remote-reference magnetotelluric sounding[J].Oil Geophysical Prospecting,1990,25(5):594-599.
[9]
Ritter O,Junge A,Dawes G J.New equipment and processing for magnetotelluric remote reference observations[J].Geophysical Journal International,1998,132(3):535-548.
[10]
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.
[11]
徐志敏,辛会翠,吕扶君.庐枞矿集区大地电磁法的远参考效果研究[J].地球物理学进展,2014,29(4):1822-1830.XU Zhimin,XIN Huicui,LV Fujun.Ore cluster area of Luzong magnetotelluric(MT) method of remote reference research[J].Progress in Geophysics,2014,29(4):1822-1830.
[12]
张刚,庹先国,王绪本,等.不同参数条件下远参考大地电磁处理效果对比分析[J].地球物理学进展,2016,31(6):2458-2466.ZHANG Gang,TUO Xianguo,WANG Xuben,et al.Analysis on remote reference magnetotelluric effect under different parameters[J].Progress in Geophy-sics,2016,31(6):2458-2466.
[13]
祝福荣,邓居智,陈辉,等.参考道方法在大地电磁测深数据中的应用研究[J].东华理工大学学报(自然科学版),2013,36(增刊1):73-78.ZHU Furong,DENG Juzhi,CHEN Hui,et al.Application of reference technique in magnetotelluric sounding data[J].Journal of East China Institute of Technology(Natural Science),2013,36(S1):73-78.
[14]
Epishkin D V.Improving magnetotelluric data processing methods[J].Moscow University Geology Bulletin,2016,71(5):347-354.
[15]
Varentsov I M,Sokolova E Y,Martanus E R,et al.System of electromagnetic field transfer operators for the BEAR array of simultaneous soundings:Methods and results[J].Izvestiya Physics of the Solid Earth,2003,39(2):118-148.
[16]
张刚,庹先国,王绪本,等.磁场相关性在远参考大地电磁数据处理中的应用[J].石油地球物理勘探,2017,52(6):1333-1343.ZHANG Gang,TUO Xianguo,WANG Xuben,et al.Application of magnetic field correlation in remote reference magnetotelluric data processing[J].Oil Geophysical Prospecting,2017,52(6):1333-1343.
[17]
Jiang L,Xu Y.Multi-station superposition for magnetotelluric signal[J].Studia Geophysica Et Geodaetica,2013,57(2):276-291.
[18]
Muoz G,Ritter O.Pseudo-remote reference proce-ssing of magnetotelluric data:A fast and efficient data acquisition scheme for local arrays[J].Geophysical Prospecting,2013,61(S1):300-316.
[19]
王辉,魏文博,金胜,等.基于同步大地电磁时间序列依赖关系的噪声处理[J].地球物理学报,2014,57(2):531-545.WANG Hui,WEI Wenbo,JIN Sheng,et al.Removal of magnetotelluric noise based on synchronous time series relationship[J].Chinese Journal of Geophysics,2014,57(2):531-545.
[20]
Larsen J C,Mackie R L,Manzella A,et al.Robust smooth magnetotelluric transfer functions[J].Geophysical Journal International,1996,124(3):801-819.
[21]
Oettinger G,Haak V,Larsen J C.Noise reduction in magnetotelluric time-series with a new signal-noise separation method and its application to a field experi-ment in the Saxonian Granulite Massif[J].Geophy-sical Journal International,2001,146(3):659-669.
[22]
林品荣,郑采君,石福升,等.电磁法综合探测系统研究[J].地质学报,2006,80(10):1539-1548.LIN Pingrong,ZHENG Caijun,SHI Fusheng,et al.The research of integrated electromagnetic method system[J].Acta Geologica Sinica,2006,80(10):1539-1548.
[23]
戴前伟,陈勇雄,侯智超.大地电磁测深数据互参考处理的应用研究[J].物探化探计算技术,2013,35(2):147-154.DAI Qianwei,CHEN Yongxiong,HOU Zhichao.A study on the application of mutual reference technique in magnetotelluric sounding data[J].Computing Techniques for Geophysical and Geochemical Exploration,2013,35(2):147-154.
[24]
Shalivahan N,Bhattacharya B B.How remote can the far remote reference site for magnetotelluric measurements be?[J].Journal of Geophysical Research:Solid Earth,2002,107(B6):1-7.
[25]
杨生,鲍光淑,张全胜.远参考大地电磁测深法应用研究[J].物探与化探,2002,26(1):27-31.YANG Sheng,BAO Guangshu,ZHANG Quansheng.A study on the application of remote reference magnetotelluric sounding technique[J].Geophysical & Geochemical Exploration,2002,26(1):27-31.
[26]
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.
[27]
Egbert G D.Robust multiple-station magnetotelluric data processing[J].Geophysical Journal Internatio-nal,1997,130(2):475-496.
[28]
Egbert G D.Processing and interpretation of electromagnetic induction array data[J].Surveys in Geophysics,2002,23(2-3):207-249.
[29]
Smirnov M Y,Egbert G D.Robust principal component analysis of electromagnetic arrays with missing data[J].Geophysical Journal International,2012,190(3):1423-1438.
[30]
周聪,汤井田,庞成,等.时空阵列混场源电磁法理论及模拟研究[J].地球物理学报,2019,62(10):3827-3842.ZHOU Cong,TANG Jingtian,PANG Cheng,et al.A theory and simulation study on the space-time array hybrid source electromagnetic method[J].Chinese Journal of Geophysics,2019,62(10):3827-3842.
[31]
Verboven S,Hubert M.LIBRA:a MATLAB library for robust analysis[J].Chemometrics and Intelligent Laboratory Systems,2005,75(2):127-136.
[32]
Smirnov M Y.Magnetotelluric data processing with a robust statistical procedure having a high breakdown point[J].Geophysical Journal International,2003,152(1):1-7.
[33]
周聪,汤井田,任政勇,等.音频大地电磁法"死频带"畸变数据的Rhoplus校正[J].地球物理学报,2015,58(12):4648-4660.ZHOU Cong,TANG Jingtian,REN Zhengyong,et al.Application of the Rhoplus method to audio magnetotelluric dead band distortion data[J].Chinese Journal of Geophysics,2015,58(12):4648-4660.
[34]
Gamble T D,Goubau W M,Clarke J.Error analysis for remote reference magnetotellurics[J].Geophy-sics,1979,44(5):959-968.
