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| A comparative study of the inversion methods of fixed-wing three-frequency airborne electromagnetic data in Erenhot-East Ujimqin Banner area |
LI Fei1,2,3,4( ), TAN Han-Dong1, MENG Qing-Min2,3,4, WU Jun-Yan1, DING Zhi-Qiang2,3,4 |
1.School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100083, China
2.Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China
3.Key Laboratory of Geophysical Electromagnetic Probing Technologies, Ministry of Natural Resources, Langfang 065000, China
4.National Research Centre of Geoexploration Technology, Langfang 065000, China |
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Abstract The fixed-wing frequency-domain airborne electromagnetic method has the characteristics of a high efficiency and a high spatial resolution. In the past, The three-frequency airborne electromagnetic data have gained many good results in China. Nevertheless, they are mainly plane qualitative interpretation results, with few quantitative inversion calculations performed, which limits the improvement of interpretation level. In this paper, fast approximate inversion, one-dimensional inversion and two-dimensional inversion are introduced into the interpretation of the field data of the key AFEM anomalies in Erenhot-East Ujimqin Banner area, and the application effects of the three methods are compared with each other. Fast approximate inversion is based on the calculation of apparent resistivity. Brent method is used for the one-dimensional inversion. Occam inversion is used for the two-dimensional inversion, and Rodi method is used to solve Jacobian matrix. The results show that fast approximate inversion can quickly and effectively provide a large quantity of underground electrical distribution information, one-dimensional inversion can provide the stable inversion results with a certain depth, and two-dimensional inversion has an advantage of obvious horizontal and vertical resolution.
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Received: 01 December 2019
Published: 26 October 2020
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2D inversion results of model data
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Comprehensive profile of line 7940 on Chaganaobao AEM anomaly
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Geological map of Chaganaobao AEM anomaly
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Comprehensive inversion profile on Chaganaobao AEM anomaly
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Comprehensive profile of line 8930 on Zhunsujihuaaobao AEM anomaly
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Geological map of Zhunsujihuaaobao AEM anomaly
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Comprehensive inversion profile on Zhunsujihuaaobao AEM anomaly
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Comparison of 1D inversion results on different parameters of three-layered model on Chaganaobao AEM anomaly
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Comparison of 2D inversion results in part on Chaganaobao AEM anomaly
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