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Magnetotelluric regularization inversion method based on deviation principle and processing terminal

A magnetotelluric and inversion technology, which is applied in the directions of acoustic re-radiation, electrical/magnetic exploration, geophysical measurement, etc., can solve the problems of local minima, accelerated inversion speed, and unconsidered convergence speed, etc., to achieve convergence speed Improve, increase inversion speed, and good inversion effect

Inactive Publication Date: 2021-03-26
GUANGZHOU MARINE GEOLOGICAL SURVEY +1
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Problems solved by technology

This method has a faster calculation speed, but it is easy to fall into the shortcoming of local minimum
In the process of searching for the regularization factor, Park et al. added the comparison between the fitting difference of the observed data and its expected value, which can eliminate redundant forward calculations and speed up the inversion speed, but did not consider the convergence speed

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  • Magnetotelluric regularization inversion method based on deviation principle and processing terminal
  • Magnetotelluric regularization inversion method based on deviation principle and processing terminal
  • Magnetotelluric regularization inversion method based on deviation principle and processing terminal

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Embodiment Construction

[0041] Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0042] like Figure 1-Figure 17 As shown, a magnetotelluric regularization inversion method based on the deviation principle includes the following steps:

[0043] Step 1: Obtain the magnetotelluric observation data, and construct the inversion operator equation to invert the magnetotelluric observation data.

[0044] The magnetotelluric inversion operator equation is as formula ①:

[0045] F(m)=d------①

[0046] In the formula, d represents the observation data of electrotellurics, which is in vector form, and the value in the vector is the data obtained from a series of actual magnetotelluric observations. m represents the resistivity model parameter in vector form, and F represents the forward modeling response operator of magnetotelluric observation data. Usually, the magnetotelluric observation data obtained from field measurements ha...

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Abstract

The invention relates to a magnetotelluric regularization inversion method based on a deviation principle and a processing terminal, and the method comprises the steps: 1, obtaining magnetotelluric observation data, and constructing an inversion operator equation; 2, solving a regularization factor in the current inversion operator equation by utilizing a deviation principle to obtain a new inversion operator equation; and 3, solving the current sensitivity in the magnetotelluric observation data, continuously inverting the magnetotelluric observation data by using the current sensitivity andthe new inversion operator equation, and taking the final inversion result as the final inversion result. According to the method, the regularization factor is calculated based on the deviation principle, and then the inversion result is obtained, so that the method does not depend on an empirical value, the inversion effect is better, the sensitivity is calculated through the deviation principlehigh-order convergence algorithm with higher convergence speed, the convergence speed is quickly increased, and the inversion speed is also increased.

Description

technical field [0001] The invention relates to the technical field of geophysical detection in earth science, in particular to a magnetotelluric regularized inversion method and a processing terminal based on the principle of deviation. Background technique [0002] The magnetotelluric inversion problem is an ill-posed problem, and the regularized inversion method is usually introduced to solve it. The stability of the inversion process is enhanced by adding prior constraints, and the non-uniqueness of the inversion results is reduced. Commonly used regularized inversion algorithms include Occam inversion, Rebocc inversion, NLCG inversion, etc. Occam inversion can introduce prior information to remove the smoothness of known structural boundaries or add resistance to similar electrical units The limit of the rate difference has advantages that other inversion algorithms do not have. However, the current magnetotelluric inversion based on the ordinary Occam inversion algori...

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Application Information

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IPC IPC(8): G01V3/38G06F17/11
CPCG01V3/38G06F17/11
Inventor 李建平张宝金王启张向宇
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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