Method for constructing multi-layer equivalent source model computational pole and converting data types

An equivalent source and model technology, applied in the field of geophysics, which can solve the problems of inaccurate calculation accuracy of polar and data type conversion and inaccurate speed control.

Active Publication Date: 2020-11-03
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Application Information

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a method for constructing a multi-layer equivalent source model to calculate the transformation between the pole and the data type in view of the defects in the prior art that the precision and speed control of the conversion operation between the pole and the data type are not accurate enough method

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  • Method for constructing multi-layer equivalent source model computational pole and converting data types
  • Method for constructing multi-layer equivalent source model computational pole and converting data types
  • Method for constructing multi-layer equivalent source model computational pole and converting data types

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Embodiment 1

[0034] Please refer to figure 1 , which is a flowchart of an implementation method for constructing a multi-layer equivalent source model disclosed in the present invention. The current embodiment is to construct a multi-layer equivalent source model, which specifically includes the following steps:

[0035] S1. Input the existing magnetic field data d 0 , d 0 Possible forms include magnetic anomaly total field data, magnetic anomaly component data, magnetic gradient tensor data, etc.

[0036] S2. Construct an equivalent source model space according to the terrain height information of the observation area and the possible maximum depth range of the magnetic anomaly detected during the magnetic field detection process, and carry out structured non-uniform multiplication on the equivalent source model space layer meshing; where:

[0037] The terrain height information will further reflect the terrain relief of the region. When inversion grid modeling is performed in the comp...

Embodiment 2

[0057] When it is necessary to obtain the polarization data of the magnetic field, the calculation of the polarization data can be performed based on a method for constructing a multi-layer equivalent source model described in Embodiment 1, which includes the following execution steps (please refer to refer to figure 2 ):

[0058] S4. Using the multi-layer equivalent source model m obtained from the solution in step S3, the polar data is obtained through the three-dimensional forward calculation of the integral equation magnetic field; wherein, the calculation formula of the forward calculation is:

[0059] B S = Gm;

[0060] Among them, G is a sensitivity matrix, which implicitly expresses parameters such as magnetic induction, magnetic inclination, magnetic declination, and observation position, which can be calculated by magnetic induction, magnetic inclination, magnetic declination, and observation position, and iterated in step S3 In the process, the magnetic inclinat...

Embodiment 3

[0062] Based on a method for constructing a multi-layer equivalent source model and a method for calculating polar data described in Embodiments 1 and 2, when performing magnetic field data conversion, the following steps are included (for specific execution procedures, please refer to image 3 ):

[0063] S4, using the multi-layer equivalent source model m obtained by solving step S3, when utilizing the method for realizing the calculation of the pole described in embodiment 2 to determine the pole data B S After that, the converted magnetic field data is calculated again by the data conversion formula; wherein, the calculation of the converted magnetic field data includes the following sub-steps:

[0064] S41. Convert from three-component data to magnetic anomaly data by the following formula:

[0065]

[0066] Among them, d s is the fitted magnetic anomaly data; B 0 = [B 0x ,B 0y ,B 0z ] is the three-component data of the background field, which implicitly expresse...

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Abstract

The invention discloses a method for constructing a multi-layer equivalent source model computational pole and data type conversion, which comprises the following steps of: inputting magnetic survey data, and performing non-uniform mesh generation on a free space and an underground space according to factors such as an observation position, height data and the like of the observation data; performing three-dimensional inversion calculation on the magnetic measurement data by utilizing a multilayer equivalent source inversion method based on an integral equation, and constructing a multilayer equivalent source model; and utilizing the built multilayer equivalent source model to perform pole transformation and data conversion calculation of the vertical magnetization geomagnetic field, wherein magnetic measurement data is calculated based on a three-dimensional forward modeling calculation method of an integral equation so as to obtain a pole transformation and data type conversion result. According to the method, a calculation framework of an equivalent source model is reconstructed on the basis of an integral equation theory, and high-precision processing of magnetic anomaly data containing a strong demagnetization effect generated by a high-magnetic susceptibility field source is achieved; moreover, the depth regularization factor is adopted, and the adaptive estimation of thedepth position of the multilayer equivalent source model by using the inversion process is realized.

Description

technical field [0001] The present invention relates to the technical field of geophysics, and more specifically, relates to a method based on an integral method to realize polarization and data type conversion of non-uniform grid multi-layer equivalent source magnetic measurement data. Background technique [0002] In geomagnetic detection, people usually detect the total field of the magnetic field, but in actual data interpretation, it is often necessary to convert these data into the required data types, such as polarized data, magnetic field components, tensor data, etc., magnetic field Data type conversion is to convert the observed magnetic field data type into required different types of magnetic field data. The main challenge of this task is that magnetic topography has certain limitations on traditional data type conversion and polarized calculation, and the traditional equivalent source data conversion method has a certain loss of data accuracy. [0003] Existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/40G01V3/38G06F30/20
CPCG01V3/40G01V3/38G06F30/20
Inventor 左博新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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