A data decoupling analysis of different devices in time-domain IP sounding
LI Zhong-Ping1,2(), HAO Feng-Yun3, WU Hong-Fei4, ZHANG Rui-Fang5, ZHU Zhao-Ming2, JIA Quan-Shan5, LIU Shuang1
1. School of Geophysics and Spatial Information, China University of Geosciences(Wuhan), Wuhan 430074, China 2. Shandong Zhengyuan Geological Exploration Institute, China General Administration of Metallurgical Geology, Jinan 250014, China 3. Habahe Jinba Mining Co. Ltd., Aertai 836700, China 4. Aertai Zhengyuan International Mining Co. Ltd., Aertai 836700, China 5. 273 Geological Brigade of Shandong Nuclear Industry, Yantai 264000, China
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.
李忠平, 郝风云, 吴鸿飞, 张瑞芳, 朱昭明, 贾全山, 刘双. 时间域激电测深不同装置数据去耦分析[J]. 物探与化探, 2022, 46(3): 722-728.
LI Zhong-Ping, HAO Feng-Yun, WU Hong-Fei, ZHANG Rui-Fang, ZHU Zhao-Ming, JIA Quan-Shan, LIU Shuang. A data decoupling analysis of different devices in time-domain IP sounding. Geophysical and Geochemical Exploration, 2022, 46(3): 722-728.
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