Exploring electromagnetic noise suppression technologies for magnetotelluric sounding in high-interference ore districts
-
摘要: 大地电磁测深(MT)在矿产资源勘探方面应用广泛, 但强人文电磁干扰严重制约了高质量的原始MT数据的获取。本文详细总结了国内常见电磁噪声源的类型, 对其产生的电磁噪声特征进行分类分析; 对国内外MT电磁噪声去噪方法进行对比, 结合实际生产需求, 总结了一套适用于高干扰矿集区快速有效的MT数据去噪施工与处理工艺。研究表明:Robust处理、远参考道技术和人工挑选是提高MT数据采集质量的有效和必要的手段, 而通过理论计算, 远参考站设置距离不小于3.56倍趋肤深度即可; 在江苏洪泽盐盆矿集区开展的MT试验工作验证了该设定。Abstract: Magnetotelluric sounding (MT) has been extensively applied in mineral resource exploration. However, strong anthropogenic electromagnetic interference severely constrains the acquisition of high-quality original MT data. This study provided a detailed summary of the common types of electromagnetic noise sources in China and analyzed the characteristics of electromagnetic noise they produced. By comparing the methods for MT electromagnetic noise reduction at home and abroad, this study developed a rapid and effective construction and processing technology for MT data denoising in high-interference ore districts based on actual production demands. The results indicate that Robust processing, remote reference technique, and manual selection are effective and necessary in enhancing MT data quality. Besides, theoretical calculations suggest that the distance between the remote reference stations should be set at 3.56-fold skin depth or above, as verified by the MT experiments in the ore district of the Hongze salt basin, Jiangsu Province.
-
-
[1] 姜建军.实施“三深一土” 国土资源科技创新发展战略的思考[J].国土资源科技管理, 2017, 34(3):1-8.
Jiang J J.Thoughts on implementing the strategy of “three depths and one soil” for scientific and technological innovation and development of land and resources[J].Scientific and Technological Management of Land and Resources, 2017, 34(3):1-8.
[2] 杨长福, 徐世浙.国外大地电磁研究现状[J].物探与化探, 2005, 29(3):243-247.
Yang C F, Xu S Z.The present situation of magnetotelluric researches abroad[J].Geophysical and Geochemical Exploration, 2005, 29(3):243-247.
[3] 陈乐寿.大地电磁测深--探测地球深部电性和物质状态的一种有效手段[J].自然杂志, 2009, 31(1):39-46.
Chen L S.Magnetotelluric sounding:An effective approch to survey electrical property and state of matter in the deep earth[J].Chinese Journal of Nature, 2009, 31(1):39-46.
[4] 陈乐寿, 王光锷.大地电磁测深法[M].北京:地质出版社, 1990. Chen L S, Wang G E.Magnetotelluric sounding method[M].Beijing:Geological Publishing House, 1990.
[5] Fischer G.The magnetotelluric sounding method[J].Eos, Transactions American Geophysical Union, 1982, 63(29):578.
[6] 张全胜, 杨生.大地电磁测深资料去噪方法应用研究[J].石油物探, 2002, 41(4):493-499.
Zhang Q S, Yang S.An application study of noise elimination for magnetotelluric sounding data[J].Geophysical Prospecting For Petrole, 2002, 41(4):493-499.
[7] 杨生.大地电磁测深法环境噪声抑制研究及其应用[D].长沙:中南大学, 2004. Yang S.The study of restraining environmental noise and its application in magnetotelluric sounding[D].Changsha:Central South University, 2004.
[8] Clarke J, Gamble T D, Goubau W M, et al.Remote-reference magnetotellurics:Equipment and procedures[J].Geophysical Prospecting, 1983, 31(1):149-170.
[9] 孙洁, 晋光文, 白登海, 等.大地电磁测深资料的噪声干扰[J].物探与化探, 2000, 24(2):119-127.
Sun J, Jin G W, Bai D H, et al.The noise interference of magnetotelluric sounding data[J].Geophysical and Geochemical Exploration, 2000, 24(2):119-127.
[10] 凌振宝, 王沛元, 万云霞, 等.强人文干扰环境的电磁数据小波去噪方法研究[J].地球物理学报, 2016, 59(9):3436-3447.
Ling Z B, Wang P Y, Wan Y X, et al.A combined wavelet transform algorithm used for de-noising magnetotellurics data in the strong human noise[J].Chinese Journal of Geophysics, 2016, 59(9):3436-3447.
[11] 朱威, 范翠松, 姚大为, 等.矿集区大地电磁噪声场源分析及噪声特点[J].物探与化探, 2011, 35(5):658-662.
Zhu W, Fan C S, Yao D W, et al.Noise source analysis and noise characteristics study of mt in an ore concentration area[J].Geophysical and Geochemical Exploration, 2011, 35(5):658-662.
[12] 徐志敏, 汤井田, 强建科.矿集区大地电磁强干扰类型分析[J].物探与化探, 2012, 36(2):214-219.
Xu Z M, Tang J T, Qiang J K.An analysis of the magnetotelluric strong interference types in ore concentration areas[J].Geophysical and Geochemical Exploration, 2012, 36(2):214-219.
[13] 葛双超, 李斌.大地电磁法人文噪声干扰特点及处理方法综述[J].物探化探计算技术, 2021, 43(5):609-619.
Ge S C, Li B.Review of the characteristics and processing methods of human noise interference in magnetotelluric[J].Computing Techniques for Geophysical and Geochemical Exploration, 2021, 43(5):609-619.
[14] 王辉, 程久龙, 腾星智, 等.矿区近场源噪声对大地电磁测深数据的影响及其压制方法[J].地球物理学进展, 2016, 31(3):1358-1366.
Wang H, Cheng J L, Teng X Z, et al.Source effect on magnetotelluric data due to mining area and its suppression[J].Progress in Geophysics, 2016, 31(3):1358-1366.
[15] 周聪, 汤井田, 原源, 等.强干扰区含噪电磁场的时空分布特征[J].吉林大学学报:地球科学版, 2020, 50(6):1870-1886.
Zhou C, Tang J T, Yuan Y, et al.Spatial and temporal distribution characteristics of electromagnetic fields in strong noise area[J].Journal of Jilin University:Earth Science Edition, 2020, 50(6):1870-1886.
[16] Gamble T D, Goubau W M, Clarke J.Magnetotellurics with a remote magnetic reference[J].Geophysics, 1979, 44(1):53-68.
[17] Ritter O, Junge A, Dawes G J K.New equipment and processing for magnetotelluric remote reference observations[J].Geophysical Journal International, 1998, 132(3):535-548.
[18] Shalivahan, 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.
[19] 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, 49.
Yang S, Bao G S, Zhang Q S.A study on the application of remote reference magnetotelluric sounding technique[J].Geophysical and Geochemical Exploration, 2002, 26(1):27-31, 49.
[20] 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 C, Tang J T, Ren Z Y, et al.Application of the Rhoplus method to audio magnetotelluric dead band distortion data[J].Chinese Journal of Geophysics, 2015, 58(12):4648-4660.
[21] Egbert G D, Booker J R.Robust estimation of geomagnetic transfer functions[J].Geophysical Journal International, 1986, 87(1):173-194.
[22] 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:Solid Earth, 1987, 92(B1):633-648.
[23] Sutarno D, Vozoff K.Robust M-estimation of magnetotelluric impedance tensors[J].Exploration Geophysics, 1989, 20(3):383-398.
[24] Goubau W M, Gamble T D, Clarke J.Magnetotelluric data analysis:Removal of bias[J].Geophysics, 1978, 43(6):1157-1166.
[25] 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, 200.
Chen Q L, Hu W B, Su Z L, et al.Study for long-distant and far-referential MT[J].Oil Geophysical Prospecting, 2002, 37(2):145-148, 200.
[26] Ueharai D, Ishimaru T, Tanase A, et al.Effectiveness of far remote reference method on magnetotelluric(MT)survey and deep resistivity structure in the southern region of the kii peninsula, southwest Japan[J].Journal of the Japan Society of Engineering Geology, 2003, 44(3):164-174.
[27] 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 Z M, Xin H C, Lyu F J.Ore cluster area of Luzong magnetotelluric(MT)method of remote reference research[J].Progress in Geophysics, 2014, 29(4):1822-1830.
[28] 张刚.长周期大地电磁数据处理方法研究[D].成都:成都理工大学, 2015. Zhang G.Research on long-period magnetotelluric data processing[D].Chengdu:Chengdu University of Technology, 2015.
[29] Mallat S G.A theory for multiresolution signal decomposition:The wavelet representation[J].IEEE Transactions on Pattern Analysis and Machine Intelligence, 1989, 11(7):674-693.
[30] 何兰芳, 王绪本, 王成祥.应用小波分析提高MT资料信噪比[J].成都理工学院学报, 1999, 26(3):299-302.
He L F, Wang X B, Wang C X.Improving the s/n ratio of mt data by wavelet analysis[J].Journal of Chengdu University of Technology, 1999, 26(3):299-302.
[31] Trad D O, Travassos J M.Wavelet filtering of magnetotelluric data[J].Geophysics, 2000, 65(2):482-491.
[32] Anvari R, Nazari Siahsar M A, Gholtashi S, et al.Seismic random noise attenuation using synchrosqueezed wavelet transform and low-rank signal matrix approximation[J].IEEE Transactions on Geoscience and Remote Sensing, 2017, 55(11):6574-6581.
[33] Cai J H, Xiao Y L.Impulse interference processing for MT data based on a new adaptive wavelet threshold de-noising method[J].Arabian Journal of Geosciences, 2017, 10(18):407.
[34] 万云霞, 王力鑫, 张宏伟, 等.基于小波变换的MT数据人文噪声抑制方法[J].吉林大学学报:信息科学版, 2021, 39(6):624-629.
Wan Y X, Wang L X, Zhang H W, et al.Research on human noise suppression of MT data based on wavelet transform[J].Journal of Jilin University:Information Science Edition, 2021, 39(6):624-629.
[35] Huang N E, Shen Z, Long S R.A new view of nonlinear water waves:The Hilbert spectrum[J].Annual Review of Fluid Mechanics, 1999, 31:417-457.
[36] Cai J H.A combinatorial filtering method for magnetotelluric time-series based on Hilbert-Huang transform[J].Exploration Geophysics, 2014, 45(2):63-73.
[37] Cai J H.A combinatorial filtering method for magnetotelluric data series with strong interference[J].Arabian Journal of Geosciences, 2016, 9(13):628.
[38] 陈钧, 严良俊, 周磊.基于Hilbert-Huang 变换的大地电磁去噪研究[J].物探与化探, 2021, 45(6):1462-1468.
Chen J, Yan L J, Zhou L.Denoising of magnetotelluric data based on Hilbert-Huang transform[J].Geophysical and Geochemical Exploration, 2021, 45(6):1462-1468.
[39] Donoho D L.Compressed sensing[J].IEEE Transactions on Information Theory, 2006, 52(4):1289-1306.
[40] 汤井田, 李广, 肖晓, 等.基于压缩感知重构算法的大地电磁强干扰分离[J].地球物理学报, 2017, 60(9):3642-3654.
Tang J T, Li G, Xiao X, et al.Strong noise separation for magnetotelluric data based on a signal reconstruction algorithm of compressive sensing[J].Chinese Journal of Geophysics, 2017, 60(9):3642-3654.
[41] Parker R L.The inverse problem of electromagnetic induction:Existence and construction of solutions based on incomplete data[J].Journal of Geophysical Research:Solid Earth, 1980, 85(B8):4421-4428.
[42] 李红领, 王光杰, 杨磊, 等.基于蒙古东戈壁AMT数据的“死频带” 分析[J].地球物理学进展, 2020, 35(6):2153-2158.
Li H L, Wang G J, Yang L, et al.Dead band analysis based on Mongolian East Gobi AMT data[J].Progress in Geophysics, 2020, 35(6):2153-2158.
[43] 徐志敏, 辛会翠, 谭新平, 等.强电磁干扰区大地电磁远参考技术试验效果分析[J].物探与化探, 2018, 42(3):560-568.
Xu Z M, Xin H C, Tan X P, et al.An analysis of the experimental result of MT remote reference technique in strong electromagnetic interference region[J].Geophysical and Geochemical Exploration, 2018, 42(3):560-568.
[44] 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, 1125-1126.
Zhang G, Tuo X G, Wang X B, et al.Application of magnetic field correlation in remote reference magnetotelluric data processing[J].Oil Geophysical Prospecting, 2017, 52(6):1333-1343, 1125-1126.
[45] 田少兵, 刘必良, 梅荣, 等.东部沿海低阻区大地电磁测深远参考试验研究[J].地球物理学进展, 2022, 37(1):430-442.
Tian S B, Liu B L, Mei R, et al.Study on the application of remote reference magnetotelluric sounding technique in low resistance area of east coast of China[J].Progress in Geophysics, 2022, 37(1):430-442.
[46] 汤井田, 何继善.可控源音频大地电磁法及其应用[M].长沙:中南大学出版社, 2005. Tang J T, He J S.Controlled source audio magnetotelluric method and its application[M].Changsha:Central South University Press, 2005.
[47] 张良怀, 李征西, 张京辉, 等.50万伏超高压输电线的电磁场时空分布特征及其实验研究[J].东北地震研究, 1998(1):17-30.
Zhang L H, Li Z X, Zhang J H, et al.Experimental research of electromagnetic field distribution around 500kv supervoltage power line[J].Seismological Research of Northeast China, 1998(1):17-30.
-
计量
- 文章访问数: 59
- PDF下载数: 11
- 施引文献: 0
下载: