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Method for inversing a wavenumber domain of underground three-dimensional magnetic distribution by magnetic total tensor gradient

A full-tensor, wavenumber-domain technology, applied in the field of geophysical exploration, can solve the problems of low inversion efficiency and large amount of calculation of large data volume models, so as to improve inversion efficiency and inversion accuracy, simple calculation, and reduce attenuation sexual effect

Active Publication Date: 2018-10-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0006] Generally speaking, the traditional 3D magnetic inversion adopts the spatial domain algorithm, which is simple to calculate, but the calculation is heavy, and the inversion efficiency for large data volume models is low

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  • Method for inversing a wavenumber domain of underground three-dimensional magnetic distribution by magnetic total tensor gradient
  • Method for inversing a wavenumber domain of underground three-dimensional magnetic distribution by magnetic total tensor gradient
  • Method for inversing a wavenumber domain of underground three-dimensional magnetic distribution by magnetic total tensor gradient

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Embodiment 1

[0055] Three-dimensional wavenumber domain inversion is a hotspot and development trend in the current research on gravity and magnetic data processing and interpretation, and it is used to quickly reconstruct the three-dimensional physical property distribution in the underground half space. Through the magnetic full tensor gradient anomaly data, more information reflecting the characteristics and details of the field source can be obtained, which is beneficial to fine underground geological interpretation. This implementation takes two combined upright cuboids as an example: the two upright cuboids (1) have the same physical properties and the same buried depth, such as figure 1 As shown in A; (2) The physical properties are different, and the buried depth is different, such as figure 1 Shown in B. Using a magnetic full tensor gradient inversion method for the three-dimensional magnetic distribution in the subsurface, such as Figure 4 shown in sequence. The method compri...

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Abstract

The invention discloses a method for inversing a wavenumber domain of underground three-dimensional magnetic distribution by magnetic total tensor gradient and an application thereof. The method comprises the steps: known prior information of a study area and observation magnetic total tensor gradient anomality are read; inversion parameters, an inversion depth range, step length, and the like areset; constrained inversion is performed on the observation magnetic total tensor gradient anomality to obtain a magnetic three-dimensional mesh model; forward is performed on the observation magnetictotal tensor gradient anomality to obtain theoretical magnetic total tensor gradient anomality; subtraction is performed on the theoretical anomaly and the observation anomaly to obtain a theoreticalanomaly residual error; and if a minimum norm solution of the anomaly residual error does not satisfy limits of error, the inversion is performed on the anomaly residual error to obtain an anomaly residual error model, the magnetic three-dimensional mesh model is updated, the steps are repeated until the anomaly residual error satisfies requirements, and a final magnetic three-dimensional mesh model is an inversion solution. The method can reflect three-dimensional distribution of magnetic properties (magnetic susceptibility or magnetization intensity) of underground space geologic bodies, and has the application value for improving the three-dimensional inversion efficiency and fine geological simulation of large data bodies.

Description

technical field [0001] The invention relates to geophysical exploration technology, in particular to a wave number domain method for inverting underground three-dimensional magnetic distribution by magnetic full tensor gradient. Background technique [0002] Magnetic method is one of the main branches of geophysical methods, and has long played an important role in resource exploration, engineering exploration and regional structural research. The forward modeling and inversion of magnetic potential field are the main ways of magnetic data processing and corresponding geological interpretation. The so-called forward modeling means that the geometric parameters and physical parameters (magnetization or magnetic susceptibility) of the underground field source body are known, and the theoretical magnetic field anomalies on the observation surface are obtained through mathematical calculations. The inversion is the opposite, that is, the magnetic field anomaly on the observatio...

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Application Information

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IPC IPC(8): G01V3/12
CPCG01V3/12
Inventor 郭良辉崔亚彤
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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