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| 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 |
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Abstract 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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Received: 07 May 2020
Published: 26 October 2020
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| 序号 | 地质层位 | 主要岩性 | 电阻率范围
/(Ω·m) | 密度
/(g·cm-3) | 磁化率
/(10-5SI) | | 1 | 白垩系K | 粉细砂岩 | 10~500 | 2.404~2.559 | 0~10 | | 2 | 三叠系T | 白云岩、角砾状白云岩、泥晶灰岩 | 1851~3442 | 2.612~2.683 | 7~15 | | 3 | 二叠系P | 灰岩、生物屑灰岩、瘤状泥灰岩 | 1560~2582 | 2.674~2.742 | 12~17 | | 4 | 石炭系C | 灰岩、细晶白云岩、细砂岩、炭质页岩 | 368~2343 | 2.598~2.766 | 1~19 | | 5 | 泥盆系D | 石英砂岩 | 300~982 | 2.624~2.716 | 3~15 | | 6 | 志留系S | 粉砂岩、泥质粉砂岩 | 79~341 | 2.342~2.437 | 1~29 | | 7 | 奥陶系O | 生物屑灰岩、泥晶灰岩 | 998~2722 | 2.579~2.708 | 0~16 | | 8 | 寒武系?2+3 | 细晶白云岩、泥质白云岩、白云质灰岩 | 974~3902 | 2.636~2.736 | 8~14 | | 9 | 寒武系?1 | 粉砂岩、页岩、炭质页岩 | 12~224 | 2.426~2.584 | 10~17 |
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Statistics of the physical properties for geothermal resources investigation in surrounding areas of a city
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Component diagram at collection point
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Schematic diagram of electromagnetic interference environment around survey line
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Evaluation curve of noise level at a point in the work area
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Comparison of the electric field amplitude curves between the signal of human workshop and natural field
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Interference field amplitude monitoring curve for 12 hours
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Comparison of the electric signal curves of artificial field and interference field at a certain point in the work area at 8:10~9:50,14:00~16:00
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A single curve of artificial field amplitude at 8:10~9:50,14:00~16:00
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Geological model of line 1 for geothermal resources survey section
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Wide field electromagnetic results of line 1 of geothermal resources survey profile
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