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Anisotropy medium magnetotelluric meshless value simulation method

A magnetotelluric and anisotropic technology, applied in the field of geophysical exploration, can solve the problems of low accuracy of field value change, difficult adaptive analysis, and high cost of generating grids, achieve smooth and stable shape functions, overcome singularity problems, and automatically Adapting the effects of numerical simulations

Inactive Publication Date: 2016-06-29
JILIN UNIV
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Problems solved by technology

[0006] The above methods are all based on grid implementation. In the process of calculation and implementation, there are disadvantages such as high cost of grid generation, low accuracy in places where field values ​​change drastically, and difficulty in adaptive analysis.

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  • Anisotropy medium magnetotelluric meshless value simulation method
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  • Anisotropy medium magnetotelluric meshless value simulation method

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[0026] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] see figure 1 , a schematic diagram of the calculation point 1, the solution domain 2, the background unit 3, the field node 4, the support domain 5 and the solution domain boundary 6 of the meshless method provided by the embodiment of the present invention.

[0028] The solution domain is the area to be solved for the entire boundary value problem, the support domain is the area selected for constructing the shape function of the meshless method, and the calculation point is the center of the support domain. In the calculation, the calculation point is often selected as the Gaussian integration point. The backgrou...

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Abstract

The invention brings forward a magnetotelluric meshless value simulation method for constructing a shape function on the basis of discrete nodes, for solving the problem of anisotropy widely existing in underground space media. It is assumed that one of electrical main shafts of an anisotropy medium is vertical to a bedding plane aspect and the other is parallel to a bedding plane direction, and thus a conductivity tensor model of an anisotropy medium model is constructed. For the purpose of solving an anisotropy magnetotelluric boundary value problem, an equivalent linear equation group corresponding to a meshless radical point interception method is derived, the shape function is constructed by compounding a multiquadric radial basis function (MQ-RBF) two times, and a large-scale sparse linear equation group is efficiently and accurately solved through QR preprocessing in a Krylov subspace and a quasi-minimal residual method (QMR). According to the invention, the constructed shape function is smooth and stable, complex distribution of physical property parameters of an electromagnetic method can be realized, and high-precision self-adaptive value simulation is realized.

Description

technical field [0001] The invention relates to the anisotropy of underground media in the field of geophysical exploration, and proposes a gridless numerical simulation method based on discrete node structure shape functions, which is suitable for geophysical exploration methods such as magnetotellurics. Background technique [0002] The structure and properties of the Earth's interior are at the heart of the study of geophysics. Earth science in the 21st century is the era of lateral inhomogeneity and anisotropy of media, tectonic and deep dynamical processes. With the continuous progress of modern observation technology and the continuous improvement of the level of understanding, the problem of anisotropy has gradually attracted people's attention, and has become a hot spot in geophysics research. [0003] Magnetotelluric Sounding (Magnetotelluric Sounding, MT) is a geophysical exploration method that uses natural alternating electromagnetic fields to study the electric...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 李桐林黄廷哲嵇艳鞠黄婉玉段超然周威帆
Owner JILIN UNIV
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