Researches on the application of wide field electromagnetic method to the complex electromagnetic interference environment:Exemplified by the geothermal exploration around a city
ZENG He-Sheng(), XU Yuan-Zhang, LIU Lei, TANG Bao-Shan, ZHANG Yi-Ran, LI Yi, CHEN Yu-Feng
Geophysical Exploration Party of Hubei Bureau of Geology,Wuhan 430056,China
The wide field electromagnetic method establishes a harmonic electromagnetic field through an artificial ground field source,sends alternating currents of different frequencies to the ground,and surveys one or more electromagnetic field components to detect geological targets of different buried depths with wide field apparent resistivity.In this method,high power and strong artificial field is used to suppress the interference field to improve the signal-to-noise ratio.Under the environment of complex human noise interferences such as high voltage line,railway,factory building,mining area,substation and periphery of the city,the amplitude of interference field signal reaches hundreds or even thousands of microamplitude,and its intensity is greater than that of wide field electromagnetic artificial field signal,so it is difficult to achieve the suppression effect.In this paper,the large-scale exploration of geothermal resources around a city was taken as an example to study the application of wide field electromagnetic method in the complex electromagnetic interference environment,with good quality observation data obtained.This example provides a direction for the application of wide area electromagnetic method in the complex electromagnetic interference environment.
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ZENG He-Sheng, XU Yuan-Zhang, LIU Lei, TANG Bao-Shan, ZHANG Yi-Ran, LI Yi, CHEN Yu-Feng. Researches on the application of wide field electromagnetic method to the complex electromagnetic interference environment:Exemplified by the geothermal exploration around a city. Geophysical and Geochemical Exploration, 2020, 44(5): 1031-1038.
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