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| Definition of full-field apparent resistivity of controlled source magnetotellurics based on inverse function principle |
QIN Xi-She1( ), MA Jie2,3, GUO Wen-Bo1,4, QI Zhi-Peng1,2,3(), CAO Hua-Ke2,3 |
1. Northwest Nonferrous Metals Mining and Geological Exploration Group Co., Ltd. for Nonferrous Metals, Xi'an 710051, China
2. College of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China
3. Integrated Geophysical Simulation Lab (Key Laboratory of Chinese Geophysics Society ), Xi'an 710054, China
4. Xi'an Geophysical and Geochemical Exploration Corporation, Bureau of Geological Exploration for Nonferrous Metals in Northwest China, Xi'an 710068,China |
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Abstract With the development of the wide-field electromagnetic method, the scope of data collection has been gradually expanded. To avoid the none-far-field resistivity distortion, this paper proposes a definition method suitable for the full-field apparent resistivity of the controlled-source electromagnetic method based on the inverse function principle. With this method, the full-field apparent resistivity can be calculated using a single component or multiple components. The full-field apparent resistivity of a homogeneous half-space model and a layered model was calculated using individual components of electric and magnetic fields and their ratios. The results show that the definition method proposed in this paper can achieve the definition of frequency-domain apparent resistivity that is not limited by space and thus can better reflect the resistivity distribution of underground media.
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Received: 17 August 2020
Published: 28 June 2022
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Corresponding Authors:
QI Zhi-Peng
E-mail: qinxsh@nwme.com.cn;qzhipeng@126.com
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Characteristic of Ex component in frequency domain about resistivity
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Characteristic of Hy component in frequency domain about resistivity
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Characteristic of Zxy component in frequency domain about resistivity
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Different offset half-space apparent resistivity calculations based on Cagniard apparent resistivity
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Apparent resistivity for different offsets in half space based on the inverse function principle
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The apparent resistivity characteristics defined by each component of the two-layer model when the offset is 200 meters
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The apparent resistivity characteristics defined by each component of the two-layer model when the offset is 1 000 meters
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The apparent resistivity characteristics defined by each component of the two-layer model when the offset is 5 000 meters
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The apparent resistivity characteristics defined by each component of the H-type model when the offset is 500 meters
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The apparent resistivity characteristics defined by each component of the H-type model when the offset is 1 000 meters
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The apparent resistivity characteristics defined by each component of the H-type model when the offset is 5 000 meters
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The apparent resistivity characteristics defined by each component of the K-type model when the offset is 200 meters
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The apparent resistivity characteristics defined by each component of the K-type model when the offset is 500 meters
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The apparent resistivity characteristics defined by each component of the K-type model when the offset is 1 000 meters
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The apparent resistivity characteristics defined by each component of the H-type model with layer thickness changes
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The apparent resistivity characteristics defined by each component of the K-type model with layer thickness changes
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