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Aviation transient electromagnetic conductivity three-dimensional inversion method based on bonn iterative method

A transient electromagnetic and electrical conductivity technology, applied in the field of electromagnetic exploration, can solve problems such as shallow exploration depth

Inactive Publication Date: 2017-09-01
XIAMEN UNIV
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Problems solved by technology

The advantages of the all-airborne electromagnetic method lie in the large coverage area, high speed and high efficiency, and the ability to explore areas that are difficult to reach on the ground. The disadvantage is that the exploration depth is shallow

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  • Aviation transient electromagnetic conductivity three-dimensional inversion method based on bonn iterative method
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  • Aviation transient electromagnetic conductivity three-dimensional inversion method based on bonn iterative method

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Embodiment Construction

[0049] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0050] The specific implementation steps are as follows:

[0051] (1) Data preprocessing

[0052] In the airborne electromagnetic method, the voltage signal received by the receiver in the air is the total field response signal, and the receiving process is subject to certain noise interference. An ideal total field response signal can be obtained by averaging, filtering and denoising the received data. Then, the calculated theoretical uniform half-space response is subtracted from the total response to obtain the secondary field response signal required for inversion.

[0053] (2) 3D initial model setting

[0054] Establish a three-dimensional layered initial model based on the information of the specific experimental flight. The parameters of the initial model include the layered information of the earth, such as the interface position of...

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Abstract

A three-dimensional inversion method for airborne transient electromagnetic conductivity based on the Bornn iterative method, involving electromagnetic exploration. Provide a set of three-dimensional conductivity inversion algorithm based on the frequency domain to improve the calculation speed of the inversion; the algorithm uses the fitting of the secondary field value to perform the inversion calculation, thereby removing the influence of the ground response of the direct wave on the signal and improving the inversion calculation speed. Acting precision. Firstly, the time-domain signal of the total field is obtained from the transient electromagnetic system, and then the time-domain response of the corresponding theoretical uniform half-space is calculated to extract the secondary field signal required for the inversion. First use the electric field integral equation to solve the electric field distribution in the calculation area, and calculate the secondary field value through the definition of the contrast function. Then use the Born iterative method to establish the inversion process, fit the secondary field values ​​in the frequency domain, and iteratively solve the contrast function, so as to obtain the distribution of the medium in the underground calculation area, and realize the three-dimensional inversion of the conductivity of the transient electromagnetic system. play.

Description

technical field [0001] The invention relates to electromagnetic prospecting, in particular to a three-dimensional inversion method of aviation transient electromagnetic conductivity based on the Born Iterative Method. Background technique [0002] Electromagnetic prospecting is a geophysical method that uses natural field sources or artificial emission current sources to excite induced electromagnetic fields in the earth, and analyzes and processes the induced electromagnetic fields to explain the distribution of underground good conductive ore bodies. Transient Electromagnetic Methods (TEM) is an electromagnetic prospecting method commonly used in geophysics. The transient electromagnetic method generates an alternating electromagnetic field in the earth by artificially transmitting a pulsed current source or other transmitting waveforms, and receives the induction signal of underground abnormal bodies changing with time, and infers and analyzes the distribution of undergro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 柳清伙邱晨梁冰洋朱春辉韩峰刘娜刘海
Owner XIAMEN UNIV
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