Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys
The semi-airborne transient electromagnetic (SATEM) method has garnered increasing attention and research interest due to its superior detection depth and high efficiency. Theoretically, the SATEM method employs a long straight grounded wire as its transmitter source; however, in practical applicati...
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MDPI AG
2025-04-01
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| Online Access: | https://www.mdpi.com/2076-3417/15/8/4389 |
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| author | Lei Liu Jianghai Xie Wentao Liu Jianmei Zhou |
| author_facet | Lei Liu Jianghai Xie Wentao Liu Jianmei Zhou |
| author_sort | Lei Liu |
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| description | The semi-airborne transient electromagnetic (SATEM) method has garnered increasing attention and research interest due to its superior detection depth and high efficiency. Theoretically, the SATEM method employs a long straight grounded wire as its transmitter source; however, in practical applications, various source shapes emerge due to terrain constraints. This paper investigates the influence of source shape on SATEM data. A three-dimensional (3D) block model is established, and a model order reduction algorithm is applied to calculate the 3D spatial distribution of electromagnetic fields generated by both an ideal linear source and a curved source. Numerical simulation results reveal that: (1) in the early stage, maximum values of electric and magnetic fields near the source are distributed along the source shape; this influence diminishes with time, and at the late stage, the spatial electromagnetic field distributions generated by linear and curved sources converge, exhibiting similar patterns regardless of the source geometry; (2) the source shape primarily affects early responses in small-offset areas while having minimal influence on late responses in large-offset regions; (3) for deep detection applications conducted in large-offset areas, the influence of the source shape can be disregarded; however, for shallow detection with receivers positioned in small-offset regions, the source shape effects should be taken into consideration. |
| format | Article |
| id | doaj-art-0a5ccb62ea8d48b08b15f12f540b558e |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-0a5ccb62ea8d48b08b15f12f540b558e2025-08-20T02:24:39ZengMDPI AGApplied Sciences2076-34172025-04-01158438910.3390/app15084389Influence of Source Shape on Semi-Airborne Transient Electromagnetic SurveysLei Liu0Jianghai Xie1Wentao Liu2Jianmei Zhou3Gansu Provincial Coal Geological Exploration Institute, Lanzhou 730000, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaCollege of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, ChinaThe semi-airborne transient electromagnetic (SATEM) method has garnered increasing attention and research interest due to its superior detection depth and high efficiency. Theoretically, the SATEM method employs a long straight grounded wire as its transmitter source; however, in practical applications, various source shapes emerge due to terrain constraints. This paper investigates the influence of source shape on SATEM data. A three-dimensional (3D) block model is established, and a model order reduction algorithm is applied to calculate the 3D spatial distribution of electromagnetic fields generated by both an ideal linear source and a curved source. Numerical simulation results reveal that: (1) in the early stage, maximum values of electric and magnetic fields near the source are distributed along the source shape; this influence diminishes with time, and at the late stage, the spatial electromagnetic field distributions generated by linear and curved sources converge, exhibiting similar patterns regardless of the source geometry; (2) the source shape primarily affects early responses in small-offset areas while having minimal influence on late responses in large-offset regions; (3) for deep detection applications conducted in large-offset areas, the influence of the source shape can be disregarded; however, for shallow detection with receivers positioned in small-offset regions, the source shape effects should be taken into consideration.https://www.mdpi.com/2076-3417/15/8/4389three-dimensional simulationgeophysical surveymineral exploration |
| spellingShingle | Lei Liu Jianghai Xie Wentao Liu Jianmei Zhou Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys Applied Sciences three-dimensional simulation geophysical survey mineral exploration |
| title | Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys |
| title_full | Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys |
| title_fullStr | Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys |
| title_full_unstemmed | Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys |
| title_short | Influence of Source Shape on Semi-Airborne Transient Electromagnetic Surveys |
| title_sort | influence of source shape on semi airborne transient electromagnetic surveys |
| topic | three-dimensional simulation geophysical survey mineral exploration |
| url | https://www.mdpi.com/2076-3417/15/8/4389 |
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