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A Discontinuous 3D Joint Inversion Method Based on Smooth Focus Regularization

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

Active Publication Date: 2022-01-25
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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  • A Discontinuous 3D Joint Inversion Method Based on Smooth Focus Regularization
  • A Discontinuous 3D Joint Inversion Method Based on Smooth Focus Regularization
  • A Discontinuous 3D Joint Inversion Method Based on Smooth Focus Regularization

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Embodiment Construction

[0020] like 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 density m...

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Abstract

A discontinuous 3D joint inversion method based on smooth focusing regularization, which provides a more reliable density model for cross-gradient joint by introducing gravity gradient information into the traditional joint inversion of gravity and magnetotelluric data, thereby improving The resolution of the joint inversion. The present invention proposes smooth focus regularization and applies it to joint inversion, which can avoid the near-surface false anomaly associated with magnetotelluric focus inversion, and at the same time recover more realistic anomaly geometry and resistivity amplitude, thereby improving The effect of joint inversion. The new strategy of inversion makes independent inversion and joint inversion alternately carried out. This strategy not only ensures the structural similarity constraints of the cross-gradient method, but also allows the iterative model response to fully fit the observed data, making the joint inversion results more reductive to the real model. The invention can effectively improve the accuracy of the cross-gradient joint inversion of gravity and magnetotelluric data, and improve the convergence of the cross-gradient joint inversion.

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 Patents(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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