Intermittent three-dimensional joint inversion method based on smooth focusing regularization

A joint inversion and smoothing technology, applied in geophysical surveys, instruments, etc., can solve problems such as difficult convergence and low resolution, and achieve the effect of reducing local false anomalies, improving resolution, and solving difficult convergence.

Active Publication Date: 2021-05-25
JILIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a discontinuous 3D joint inversion method based on smooth focusing regularization in order to solve the problems of low resolution and difficult convergence of the existing cross-gradient joint inversion method for 3D gravity and magnetotelluric data

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  • Intermittent three-dimensional joint inversion method based on smooth focusing regularization
  • Intermittent three-dimensional joint inversion method based on smooth focusing regularization
  • Intermittent three-dimensional joint inversion method based on smooth focusing regularization

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Embodiment Construction

[0020] Such as figure 1 As shown in , a discontinuous 3D joint inversion method based on smooth focus regularization includes the following steps:

[0021] 1) Read in the observation data of 3D gravity, gravity gradient and magnetotelluric, read in the initial model, set the expected fitting difference and the maximum number of iterations, calculate and record the initial fitting difference.

[0022] 2) Based on the traditional focusing regularization, the gravity and gravity gradient data are combined to perform several separate density inversions, and iterate until the initial structure of the density model is revealed. Based on smooth focusing regularization, the magnetotelluric data are independently inverted several times for resistivity, and iterated until the initial structure of the resistivity model is revealed. The fit difference is calculated and recorded for each iteration.

[0023] 3) Alternately perform discontinuous cross-gradient joint inversion on the densit...

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Abstract

Provided is an intermittent three-dimensional joint inversion method based on smooth focusing regularization; the method introduces gravity gradient information into traditional joint inversion of gravity and magnetotelluric data, and provides a more reliable density model for cross gradient joint, thereby improving the resolution ratio of joint inversion. Smooth focusing regularization is put forward and applied to joint inversion, the near-surface false anomaly problem associated with magnetotelluric focusing inversion can be avoided, meanwhile, the more real abnormal body geometric shape and resistivity amplitude are recovered, and thus the joint inversion effect is improved. A new inversion strategy enables independent inversion and joint inversion to be carried out alternately. The strategy not only ensures the structural similarity constraint of the cross gradient method, but also enables the iterative model response to be fully fitted to the observation data, so that the joint inversion result can restore a real model better. According to the method, the accuracy of the gravity and magnetotelluric data cross gradient joint inversion can be effectively improved, and the convergence of the cross gradient joint inversion is improved.

Description

technical field [0001] The invention relates to the processing technical field of cross-gradient joint inversion of three-dimensional gravity and magnetotelluric data, and particularly proposes an intermittent three-dimensional joint inversion method based on smooth focusing regularization. Background technique [0002] The joint inversion interpretation of various geophysical data can significantly improve the exploration resolution, and has been widely used in deep geological exploration and exploration of minerals, geothermal, water and other resources. The joint inversion method based on cross-gradient constraints has become one of the most popular joint inversion techniques because of its advantages of not relying on empirical relations and not requiring any assumptions on the initial model. Gravity prospecting and magnetotelluric prospecting have been widely used due to their characteristics of wide coverage, high efficiency and low cost, and the cross-gradient joint i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 何浩源李桐林张镕哲
Owner JILIN UNIV
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