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A magnetic anomaly polarization method

A magnetic anomaly and magnetic field direction technology, applied in the field of geophysical survey, can solve the problems of reducing the accuracy of magnetic survey and unable to reflect the geological conditions, and achieve the effect of improving the accuracy

Active Publication Date: 2018-05-29
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

It is obviously unreasonable to use a single magnetic inclination angle as the polarizing treatment, and the result will not be able to reflect the real geological conditions, reducing the accuracy of magnetic prospecting

Method used

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Embodiment Construction

[0042] see figure 1 , figure 1 It is a flowchart of a magnetic anomaly polarizing method provided by an embodiment of the present invention. Such as figure 1 As shown, the method of the present embodiment includes the following steps:

[0043] Step S1: collect magnetic field data in the study area, correct the collected magnetic field data, and obtain magnetic anomaly data.

[0044] In this step, the magnetic field data of the research area is collected in the field by a magnetometer, and the obtained magnetic field data is imported into a computer for various corrections to obtain abnormal data.

[0045] Step S2: Grid the magnetic anomaly data to form regular magnetic anomaly data t(x, y), where x, y respectively represent the coordinates of the plane grid points of the magnetic anomaly data, which is recorded as a matrix T(1:m,1 :n), the size is m×n, m represents the number of rows, and n represents the number of points.

[0046]In this step, specifically, the magnetic ...

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Abstract

The invention discloses a magnetic anomaly RTP method. The method comprises the following steps that collected magnetic-field data is corrected to obtain magnetic anomaly data; the magnetic anomaly data forms regular magnetic anomaly data t (x, y), and is recorded as a matrix T (1:m, 1:n); a geomagnetic-field direction of a research area is obtained, and arranged into a matrix I (1:m, 1:n) whose size equals that the matrix T (1:m, 1:n); the matrix T (1:m, 1:n) is edged and converted into a new matrix T' (1-m':m+m', 1-n':n+n'); a frequency-domain RTP factor is designed, inverse Fourier transform is carried out, and an RTP result is obtained; the vertical gradient and total gradient of the RTP result are calculated, and the residual magnetism direction is determined via a maximal cross correlation coefficient; and according to the geomagnetic field direction mad residual magnetism direction, inclination-angle-variable RTP is carried out on the matrix T' and I in the frequency domain, and an inclination-angle-variable RTP result of the magnetic anomaly in the research area is calculated. Thus, the accuracy of exploration via a magnetic method can be improved.

Description

technical field [0001] The invention relates to the technical field of geophysical surveying, in particular to the field of magnetic prospecting, and in particular to a method for polarizing magnetic anomalies. Background technique [0002] In magnetic prospecting, the processing and interpretation of magnetic survey data (such as polarization, derivative conversion, component conversion, forward modeling and inversion, etc.) usually requires known magnetic field direction information. The magnetic field is a vector field, and the magnetic field strength measured by the magnetometer is a scalar quantity, without the direction of the magnetic field. The magnetic field direction is the vector sum of the induced magnetization direction and the residual magnetization direction. The direction of the induced magnetic field, that is, the direction of the geomagnetic field, is obtained by using the international geomagnetic reference field; while the direction of the residual magne...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 刘康郝天珧文百红杨辉黄松胡卫剑
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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