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Near-field correction method of apparent resistivity of controlled source audio-frequency magnetotelluric method

An audio magnetotelluric and apparent resistivity technology, applied in the field of artificial field source frequency domain electromagnetic method data processing, can solve the problems of 45-degree rise of low-frequency data, shape distortion, etc., to achieve the correction of shape distortion, easy to implement, and wide application range Effect

Active Publication Date: 2018-06-15
江苏省有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院
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Problems solved by technology

[0003] One of the purposes of the present invention is to address the above deficiencies, to provide a controllable source audio magnetotelluric method apparent resistivity near-field correction method, in order to solve the possible near-field effect of the controllable source audio magnetotelluric method apparent resistivity curve Morphological distortion, resulting in technical problems such as 45-degree rise in low-frequency data

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Embodiment Construction

[0030] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0031] One embodiment of the present invention is a controllable source audio frequency magnetotelluric method apparent resistivity near-field correction method, the method includes the following steps:

[0032] Step S1, using Fourier transform to transform the current data, electric field data, and magnetic field data in the time domain into frequency domain data;

[0033] In this step, the aforementioned current data, electric field data, and magnetic field data all need to be measured by the instrument;

[0034] Step S2, according to the electric field data and magnetic field data in the frequency domain data, calculate and obtain the Carnia apparent resistivity and phase;

[0035] In this step, the Carnia apparent resistivity can be calculated by the following formula:

[0036]

[0037] In the formula, ρ is the Carnia apparent resistivity, μ is the magnetic p...

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Abstract

The invention, which belongs to the field of electromagnetic method data processing of the artificial field source frequency domain for geophysical exploration, discloses a near-field correction method of the apparent resistivity of a controlled source audio-frequency magnetotelluric method. The method comprises: step A, transforming current data, electric field data, and magnetic field data in atime domain into frequency domain data by using Fourier transformation; step B, according to electric field data and magnetic field data in the frequency domain data, carrying out calculation to obtain a Cagniard apparent resistivity and a phase; and step C, determining whether a near-field effect exists based on the Cagniard apparent resistivity and phase features; and if so, acquiring a correction parameter based on ratio of normalized theoretical electric field data to electric field data after current normalization. Therefore, morphological distortion of an apparent resistivity curve is corrected and a low-frequency data form is restored; and thus the data of the source-detectable audio-frequency magnetotelluric method can be applied to the data inversion to the great extent, so that more underground electrical structure information is obtained.

Description

technical field [0001] The present invention relates to the data processing field of frequency domain electromagnetic method of artificial field source in geophysical exploration, and more specifically, the present invention mainly relates to a near-field correction method of apparent resistivity of controllable source audio magnetotelluric method. Background technique [0002] The currently used controlled source audio magnetotelluric method cannot work in the near-field area, which limits the exploration construction and data processing of the controlled source audio magnetotelluric method. At present, the work of the controlled source audio magnetotelluric method must ensure that the transceiving distance is greater than 3 to 5 times the skin depth, so as to achieve the purpose of far-field observation. However, since the subsurface apparent resistivity is our exploration target, the skin depth is an unknown quantity, which can only be estimated based on existing data. A...

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Application Information

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IPC IPC(8): G01V3/38G01V3/08
Inventor 杨轮凯叶景艳周印明肖明辉杨华忠
Owner 江苏省有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院
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