Field source depth obtaining method based on potential field data downward continuation

A data and potential field technology, applied in the field of geophysical geological resource exploration, can solve the problems of upward continuation and lower data resolution, and achieve the effect of stable depth continuation characteristics, favorable promotion and popularization, and accurate depth calculation effect

Active Publication Date: 2020-06-26
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • 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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  • Field source depth obtaining method based on potential field data downward continuation
  • Field source depth obtaining method based on potential field data downward continuation
  • Field source depth obtaining method based on potential field data downward continuation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 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.

[0048] Adopt the method of the present invention to carry out the Chebyshev-Padé downward continuation depth calculation after the improved analysis signal data, and carry out normalization processing to the calculation re...

Embodiment 2

[0050] 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 Image 6 Parsed signal data shown. Further, the method of the present invention is used to calculate the depth of the Chebyshev-Padé downward extension of the an...

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Abstract

The invention provides a field source depth obtaining method based on downward continuation of potential field data. The field source depth obtaining method comprises the steps of S1, obtaining actually measured potential field data; s2, calculating analytic signal data according to the actually measured potential field data; s3, analyzing the signal data according to the actually measured potential field data; calling a preset depth calculation model; obtaining the depth position of the target body; the depth calculation model carries out downward continuation calculation on the analysis signal data according to an improved Chebyshev-Pad approximation downward continuation calculation method, simple normalization calculation is carried out on a calculation result, the position of a localmaximum value is found based on the calculation result, and the position of the local maximum value is the depth position of the field source; and S4, performing three-dimensional visualization on thecalculation result obtained in the S3, and visually displaying the depth position of the field source. Compared with a conventional regularization downward continuation method, the method is higher in resolution and more accurate in depth calculation effect, can achieve the high-precision depth calculation of the field source, and facilitates the popularization and promotion.

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 Applications(China)
IPC IPC(8): G01V7/00G01V3/08G01V11/00
CPCG01V3/081G01V7/00G01V11/00
Inventor 周文纳
Owner LANZHOU UNIVERSITY
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