A Method for Obtaining Field Source Depth Based on Downward Extension of Potential Field Data

A data and potential field technology, applied in the field of geophysical geological resource exploration, can solve problems such as upward extension and lower data resolution, achieve stable depth extension characteristics, facilitate popularization and popularization, and achieve the effect of accurate depth calculation.

Active Publication Date: 2021-04-06
LANZHOU UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

At present, there are many depth calculation methods based on upward continuation to construct multi-scale potential field information, but upward continuation reduces the resolution of data, so there are certain defects in practical applications

Method used

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  • A Method for Obtaining Field Source Depth Based on Downward Extension of Potential Field Data
  • A Method for Obtaining Field Source Depth Based on Downward Extension of Potential Field Data
  • A Method for Obtaining Field Source Depth Based on Downward Extension of Potential Field Data

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Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 The magnetic anomaly data map of the two infinitely extending plate-shaped objects is shown, the magnetization inclination angle is set to 0°, the magnetization declination angle is -60°, and the top surface of the two infinitely extending plate-shaped objects is 10m and 20m from the ground surface respectively. The inclination angles are 120° and 60° respectively, and the magnetic susceptibility are 50 and 100 respectively, the magnetic anomalies produced are as follows figure 1 shown. The method of the invention is used for depth calculation. According to the calculation process, the analytical signal of the magnetic anomaly is obtained first, and after calculation, the following is obtained: figure 2 Parsed signal data shown.

[0046] Adopt the method of the present invention to carry out the Chebyshev-Padé downward continuation depth calculation after the improved analytical signal data, and carry out normalization processing to the calculation ...

Embodiment 2

[0048]In order to further verify the effect of the method of the present invention, two spheres with different buried depths are used to calculate the gravity data, and the calculation results of the present invention are also compared with the traditional regularized downward continuation calculation results. Such as Figure 5 Shown are the gravity data anomalies of two sphere models, the spheres have radii of 10m and 15m respectively, the distances from the ground are 30m and 90m respectively, and the residual density is 1g / cm 2 , the magnitude of the gravity anomaly generated becomes smaller with the increase of depth, and the magnitude of the deep sphere is smaller. Carrying out the deep calculation of the model data in the present invention, firstly carry out the analysis signal calculation, and obtain such as Figure 6 Parsed signal data shown. Further, the method of the present invention is used to calculate the depth of the extended Chebyshev-Padé downward extension ...

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Abstract

The present invention proposes a method for obtaining field source depth based on the downward continuation of potential field data. The steps are: S1: Obtain the measured potential field data; S2: Calculate the analytical signal data based on the measured potential field data; S3: According to the measured potential field Data and analytical signal data, calling the preset depth calculation model to obtain the depth position of the target body, the depth calculation model performs downward continuation calculation on the analytical signal data according to the improved Chebyshev-Padé approximation downward continuation calculation method, and Perform simple normalization calculations on the calculation results, and find the position of the local maximum based on the calculation results. The position of the local maximum is the depth position of the field source; S4: three-dimensional visualization of the calculation results obtained in S3, intuitive display The depth position of the field source. Compared with the conventional regularized downward continuation method, the present invention has higher resolution and more accurate depth calculation effect, and the present invention can perform high-precision depth calculation of field sources, which is beneficial to promotion and popularization.

Description

technical field [0001] The invention relates to the technical field of geophysical geological resource exploration, in particular to a field source depth acquisition method based on downward continuation of potential field data. Background technique [0002] The calculation of field source depth using potential field data has always been a difficult problem in the interpretation of potential field data. Due to the limitation of the longitudinal resolution and resolution ability of the potential field data itself, the accuracy of depth calculation is low and the mutual interference between field sources is serious. At the same time, It is also susceptible to various noise and interference factors. In addition, the shape of the target itself also has a great influence on the calculation of depth. Considering the above influencing factors, finding a good depth calculation method is one of the key issues in the interpretation of potential field data. [0003] The existing meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/00G01V3/08G01V11/00
CPCG01V3/081G01V7/00G01V11/00
Inventor 周文纳
Owner LANZHOU UNIVERSITY
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