Potential field abnormal separation method based on wavelet spectral analysis

A spectrum analysis and potential field technology, applied in seismic signal processing and other directions, can solve the problems of little discussion on effects, lack of quantitative or semi-quantitative evaluation methods, etc., and achieve the effect of improving effectiveness and pertinence

Inactive Publication Date: 2012-07-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, there is little discussion on the effect of using wavelet multi-scale analysis to separate potential field anomalies, and there is a lack of quantitative or semi-quantitative evaluation methods

Method used

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  • Potential field abnormal separation method based on wavelet spectral analysis
  • Potential field abnormal separation method based on wavelet spectral analysis
  • Potential field abnormal separation method based on wavelet spectral analysis

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specific Embodiment approach 1

[0052] Specific implementation 1: refer to the appendix figure 1 . Taking the analysis of gravity anomaly in a certain area as an example, the implementation steps are as follows:

[0053] (1) Gridding the potential field abnormal signal observed by the irregular grid to form the potential field abnormal signal of the regular grid, and then performing edge expansion processing on the potential field abnormal signal of the regular grid;

[0054] (2) Carry out wavelet multi-scale analysis, and use Halo wavelet basis to carry out multi-scale analysis of gravity anomaly, and obtain the wavelet multi-scale decomposition results with scale s of 5, 6, and 7;

[0055] The embodiment of the present invention selects the Halo wavelet base, which has good isotropic uniformity and good band-pass properties, and is suitable for regional field separation. Obviously, other similar wavelet bases can also be used for analysis and comparison.

[0056] figure 2 It is the fifth-order, sixth-...

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Abstract

The invention provides a potential field abnormal separation method based on a wavelet spectral analysis. The method, which is implemented on a computer, comprises the following steps that: gridding is carried out on a potential field abnormal signal observed by an irregular grid so as to form a potential field abnormal signal of a regular grid; according to a purpose of potential field separation abnormity and a wavelet basis characteristic, a wave basis function is determined; and a wavelet multiple dimensioned analysis is carried out on the potential field abnormal signal of the regular grid so as to obtain potential field abnormal signals under different dimensions; radial power spectrums of the potential field abnormal signals that are obtained under different dimensions are respectively calculated; and according to the radial power spectrums of the potential field abnormal signals obtained under the different dimensions, corresponding filed source body depths are respectively estimated. By employing the provided method in the invention, quantitative evaluation can be carried out on field source depths corresponding to separated potential field abnormal signals.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration and research on the earth's internal structure, in particular to a method for separating potential field anomalies based on wavelet spectrum analysis. Background technique [0002] The separation of gravity and magnetic anomalies is the difficulty and key point in potential field research. Theoretically speaking, the separation of potential field anomalies is a multi-solution problem. Especially in complex geological conditions, the separation of gravity and magnetic anomalies is often very difficult. Based on the statistical characteristics of gravity and magnetic anomalies and geological prior knowledge, combined with the spectral characteristics of anomalies, the results of anomaly field separation are comprehensively selected. [0003] In the early stage of separation of potential field anomalies, methods such as freehand smoothing, moving average, polynomial fitting, least squ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 徐亚郝天珧江为为
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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