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Potential field data rapid inversion method based on continuous fraction expansion and downward continuation

A continuous fraction and data technology, applied in the field of geophysical and geological resource exploration, can solve the problems of reducing the resolution of imaging interpretation and affecting the interpretation effect, and achieve the effect of achieving resolution, improving calculation speed, and being conducive to popularization and popularization.

Active Publication Date: 2022-03-11
LANZHOU UNIVERSITY
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Problems solved by technology

[0004] However, fast imaging inversion methods are basically established based on upward continuation, which will reduce the resolution of imaging interpretation to a certain extent and affect the final interpretation effect

Method used

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  • Potential field data rapid inversion method based on continuous fraction expansion and downward continuation
  • Potential field data rapid inversion method based on continuous fraction expansion and downward continuation
  • Potential field data rapid inversion method based on continuous fraction expansion and downward continuation

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Embodiment 1

[0044] Such as figure 1 The magnetic anomaly data map of the two upright prisms shown, set the magnetization inclination angle to 90°, the magnetization declination angle to 0°, their length, width and height are: 200m, 200m, and 100m respectively, and the coordinates of their center points are: ( 350, 500, 150), (650, 500, 150), the total magnetization is 1A / m, and the magnetic anomalies produced are as follows figure 1 shown. Utilize the method of the present invention to carry out rapid imaging calculation, first set the calculation depth to 300m, and the downward interval is 20m, multiply the magnetic anomaly data by the downward extension imaging factor to calculate the imaging result, and then multiply it by the magnetic susceptibility physical property parameter The conversion factor is converted and calculated to obtain the basic magnetic susceptibility parameter results. On this basis, 20 iterative calculations are performed to obtain the final calculation results. F...

Embodiment 2

[0047]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 DEXP iterative inversion calculation results. Such as Figure 4 The gravity data anomalies of the two sphere models are shown. The radius of the spheres is 50, the distance from the ground is 100m and 120m, and the center point coordinates are (400, 500, 100), (600, 500, 120) residual density is 0.5g / cm3, the magnitude of gravity anomaly becomes smaller as the depth increases, and the magnitude of the deep sphere is smaller. Utilize the present invention to perform inversion calculation on the model data. According to the calculation requirements, first set the calculation depth to 300m, and the downward interval is 20m. Multiply the gravity anomaly data by the downward continuation imaging factor to calculate the imaging re...

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Abstract

The invention relates to the technical field of geophysical geological resource exploration, in particular to a potential field data rapid inversion method based on continuous fraction expansion and downward continuation. According to the method, a stable continued fraction expansion downward continuation method is established, a low-pass filtering factor is combined, a novel frequency domain continued fraction expansion potential field data downward continuation imaging method is formed, frequency domain linear inversion is converted into physical property parameters, and rapid inversion calculation of potential field data is achieved through an iteration method. Compared with a traditional inversion method, the method has the advantages that the resolution can be improved due to the fact that the stable large-depth continuation characteristic is utilized, meanwhile, iteration is carried out based on the imaging result, inverse transformation calculation of a matrix is avoided, and the calculation speed is increased; the method has a higher resolution ratio and a more accurate imaging inversion calculation effect, can be used for high-precision rapid inversion calculation of a field source, and is beneficial to popularization and popularization.

Description

technical field [0001] The invention relates to the technical field of geophysical geological resource exploration, in particular to a rapid inversion method for potential field data based on continuous fraction expansion and downward continuation. Background technique [0002] The inversion calculation of physical properties using potential field data has always been a difficult and hot issue in the interpretation of potential field data. The performance takes too long, resulting in slow or impossible calculation. Combining the above influencing factors, finding a good fast inversion method for large amounts of data is one of the key issues in potential field data interpretation. [0003] Compared with the traditional conventional inversion method, the main feature of the fast imaging inversion method is that the fast imaging inversion method can quickly give the approximate range of the density body and the density correlation without prior information and iterative calcu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/00G01V3/08
CPCG01V7/00G01V3/081Y02A90/30
Inventor 周文纳陈万峰唐海翟新伟唐应德赵姣龙王金荣
Owner LANZHOU UNIVERSITY
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