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| Research on response characteristics of airborne magnetotelluric tipper based on three-dimensional finite element |
LIU Yan-Tao1,2,3( ), PENG Li-Hong1,2,3, SUN Dong-Hua1,2,3, ZHANG Wei-Meng1,2,3, WANG Hai-Hong1,2,3 |
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, China
2. Key Laboratory of Uranium Resources Geophysical Exploration Technology, China Nuclear Industry Group Company, Shijiazhuang 050002, China
3. Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology, Shijiazhuang 050002, China |
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Abstract Tippers are important parameters for the interpretation of airborne magnetotelluric data, and the study on the response characteristics of tippers is of great significance for the data interpretation. This study firstly introduces the basic principle of airborne magnetotelluric and ZTEM airborne magnetotelluric data acquisition system, then simulates the tipper response of the simple abnormal bodies using the three-dimensional finite element method, and finally analyzes the response characteristics of tippers Tx and Ty when the survey lines obliquely intersect with a lithologic interface. As indicated by the results, both Tx and Ty responded to the lithological interface in the case that the survey lines obliquely intersected with a lithologic interface. Meanwhile, the tipper exhibited corresponding laws with the change in the direction of the survey lines in that case. This study further deepens the understanding of the response of tipper to lithologic interfaces and will provide references and guidance for the interpretation of tipper data.
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Received: 14 December 2020
Published: 15 December 2021
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System of ZTEM
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Curve of frequency-skin depth
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Example of model meshing
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Schematic diagram of complex geological modle
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Variation trend of three components of magnetic field at two typical frequencies
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3D model sketch
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Sketch map of survey line
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Low-resistance response characteristics of tipper on survey line a
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Low-resistance response characteristics of tipper on survey line b
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Low-resistance response characteristics of tipper on survey line c
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High-resistance response characteristics of tipper on survey line a
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High-resistance response characteristics of tipper on survey line b
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High-resistance response characteristics of tipper on survey line c
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