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A Magnetic Field Notch Analysis Method for Extracting Geophysical Magnetic Anomaly Field Boundaries

A technology of geophysics and analytical methods, applied in geophysical measurement, electric/magnetic exploration, utilization of re-radiation, etc., can solve the problem of false boundaries becoming more and more powerful

Active Publication Date: 2020-11-10
中国自然资源航空物探遥感中心
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, most of the boundary identification methods have this problem when extracting the boundary of the magnetic field, and this false boundary will become more and more strong as the boundary identification method's ability to strengthen the weak boundary increases. This problem has not been solved in the industry. solve

Method used

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  • A Magnetic Field Notch Analysis Method for Extracting Geophysical Magnetic Anomaly Field Boundaries
  • A Magnetic Field Notch Analysis Method for Extracting Geophysical Magnetic Anomaly Field Boundaries
  • A Magnetic Field Notch Analysis Method for Extracting Geophysical Magnetic Anomaly Field Boundaries

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Embodiment

[0093] Taking the modulus anomaly ΔT of the total magnetic field in the Rizhao-Lianyungang area as an example, the specific operation steps of the present invention in practical engineering application are illustrated. The flow chart of the present invention is as figure 1 As shown, the specific steps are as follows:

[0094] Step 1: Input of the modulus anomaly △T data of the total magnetic field

[0095] The modulus anomaly △T data of the total magnetic field in the Rizhao-Lianyungang area is selected as the input data, the data is in ".grd" format, the grid size is 0.004°×0.004°, and the grid size is 366×496 grid points. The modulus anomaly △T of the total magnetic field in Rizhao-Lianyungang is shown as figure 2 .

[0096] Step 2: Magnetic field component conversion and total horizontal component mode calculation

[0097] The data of the total magnetic field modulus anomaly △T in the Rizhao-Lianyungang area were transformed into components. The parameters of the int...

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Abstract

The present invention discloses a magnetic field nicking analysis method for extraction of a physical geography magnetic anomaly field boundary. An analysis relation between a magnetic field and a gravitational field is employed, namely a Poisson's equation, to deduce three components of a second-order spectral moment at the surface of the magnetic field to obtain result parameters of magnetic field surface nicking analysis. The method comprises the four steps of: 1, magnetic field component conversion; 2, total magnetic field modulus anomaly [Delta]T total horizontal component module surfacelocal surface element second-order spectral moment; 3, total magnetic field modulus anomaly [Delta]T total horizontal component module surface local surface element invariant statistics; and 4, boundary coefficient extracted from the magnetic field surface. The magnetic field nicking analysis method is employed to perform boundary extraction of the magnetic field to eliminate the false boundary caused by associated anomaly while retaining the high enhancement capacity, resolving power and noise suppression capacity of the gravity nicking analysis for the weak boundary so as to provide more efficient reference information for the interpretation of the geologic structure.

Description

technical field [0001] The invention relates to the technical field of geophysical information processing, in particular to a magnetic field notch analysis method for extracting geophysical magnetic anomaly field boundaries. It can extract boundary information from the surface of geophysical magnetic anomalies, eliminate false boundaries caused by magnetic field associated anomalies, and thus provide more accurate and objective reference information for fault division, magnetic body boundary delineation and geological interpretation. Background technique [0002] Because the boundaries extracted from gravity and magnetic anomalies can be used for geological structure interpretation, such as inferring fault structures, indicating tectonic units to delineate the boundaries of geological bodies, etc., scholars at home and abroad have conducted a lot of research on the boundary extraction of gravity and magnetic anomalies and developed Various methods and techniques. The bounda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/40
CPCG01V3/40
Inventor 孙艳云曾祥芝
Owner 中国自然资源航空物探遥感中心
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