A new method for removing EM-coupling in spread spectrum induced polarization based on exponential function fitting
XIANG Bi-Wen1, CHEN Ru-Jun1, CHUN Shao-Heng1, YAO Hong-Chun2, WU Hong2, LIU Wei-Qiang1
1. School of Geosciences and Info-physics, Central South University, Changsha 410083, China;
2. Champion Geophysical Technology, Changsha 410005, China
The EM-coupling is one of the basic interference in the spectral-induced polarization, especially when the working area is covered with lower-resistivity layer or the current electrode spacing is large. It has great impact on the depth of the exploration and the effect of exploration. Recently, most methods to remove the EM-coupling are centered on the multi-frequency amplitude and the multi-frequency phase. These methods are based on the amplitude and the phase difference between the IP effect and the EM-coupling, which do not work well at strong EM-coupling. The authors' work is based on the IP model, and fits the IP effects with exponential function. Then the EM-coupling effects are removed from the time domain data. The phase and the relative phase after removing EM-coupling are confirmed more effectively based on the application in field data.
向毕文, 陈儒军, 淳少恒, 姚红春, 吴宏, 刘卫强. 利用指数函数拟合去除扩频激电信号中的电磁耦合感应[J]. 物探与化探, 2015, 39(5): 1053-1058.
XIANG Bi-Wen, CHEN Ru-Jun, CHUN Shao-Heng, YAO Hong-Chun, WU Hong, LIU Wei-Qiang. A new method for removing EM-coupling in spread spectrum induced polarization based on exponential function fitting. Geophysical and Geochemical Exploration, 2015, 39(5): 1053-1058.
[1] Wait J R. A phenomenological theory of induced electrical polarization[J].Canadian Journal of Physics, 1958, 36(12): 1634-1644.[2] Coggon J H. New three point formulas for inductive coupling removal in induced polarization[J].Geophysics,1984,49(3):307-309.[3] Dey A,Morrison H F.Electromagnetic coupling in frequency and time domain induced polarization surveys over multilayered earth[J].Geophysics,1973,38(2):380-405.[4] Hallof P G.The IP phase measurement and inductive coupling[J]. Geophysics,1974,39(5):650-665.[5] Pelton W H,Ward S H,Hallof P G,et al.Mineral discrimination and removal of inductive coupling with multi-frequency IP[J].Geophysics,1978,43(3):588-609.[6] Schmutz M,Ghorbani A,Vaudelet P,et al.Cable arrangement to reduce electromagnetic coupling effects in spectral-induced polarization studies[J].Geophysics,2014,79(2):A1-A5.[7] 战克,王继伦.变频法中电磁耦合的近似校正方法[J].地质与勘探,1981,17(4):40-46.[8] 傅良魁,张虎豹.频谱激电若干理论研究[J].物探与化探,1983,19(6):410-420.[9] 罗延钟.利用多频测量作"变频法"电磁耦合校正[J].地质与勘探,1980,16(10):43-52.[10] 黄寄洲,张国鸿.频率域激电法的电磁耦合校正应用研究[J].安徽地质,2014,24(3):205-209.[11] 徐勇,陈林,管文慧.变频法电磁耦合效应校正原理与实例[J].西部资源,2012,(4):190-191.[12] 崔燕丽,白宜诚,罗维斌.多频去耦在双频激电数据去耦中的应用[J].物探与化探,2006,30(1):71-74.[13] 陈儒军,何继善,白宜诚,等.多频激电相对相位谱研究[J].中南大学学报:自然科学版,2004,35(1):106-111.[14] 陈儒军.伪随机多频电磁法观测系统研究[D].长沙:中南大学,2003.[15] 郭鹏,林品荣,石福生.相位激电电磁耦合两频校正技术[J],物探与化探,2010,34(4):491-492.[16] 付国红.频率域激发极化法斩波去耦关键技术与理论研究[D].长沙:中南大学,2007.[17] Xi X,Yang H,He L F,et al.Chromite mapping using induced polarization method based on spread spectrum technology[C]//Smith S D.Symposium on the application of geophysics to engineering and environmental problems,Denver:Environment and engineering geophysical society,2013:13-19.[18] 何继善.双频激电法[M].北京:高等教育出版社,2005.[19] 刘飞,陈辉,蒋才洋,等.含电磁耦合效应的偶极-偶极装置频谱激电效应特征研究[J].科技信息,2014(13):70-71.
