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Potential field anomaly edge enhancement method based on transition zone and phase congruency

An edge-enhancing, superimposed technology, applied in the field of geophysical exploration, can solve the problem of noise sensitivity

Active Publication Date: 2013-02-20
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the characteristics of the potential field data, this method can enhance the transition zone to ensure the edge position, and can use the superposition information to improve the detection ability of subtle anomaly differences, and at the same time overcome the sensitivity of superposition to noise.

Method used

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  • Potential field anomaly edge enhancement method based on transition zone and phase congruency
  • Potential field anomaly edge enhancement method based on transition zone and phase congruency
  • Potential field anomaly edge enhancement method based on transition zone and phase congruency

Examples

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Embodiment 1

[0054] attached figure 2 Shown is a simple model with a "ten" inside the circumference. The model is different from the geophysical gravity and magnetic data, and its edge characteristics are also different from the gravity and magnetic anomaly edges. However, according to the intercepted section, the edge in the model is similar to a special case of gravity-magnetic anomaly—that is, a shallow vertical contact surface with very different physical properties (density or magnetism) on both sides.

[0055] attached to figure 2 Two kinds of edge enhancement are carried out in the simple model of : the horizontal total gradient mode and the method of the present invention. The horizontal total gradient method is a very commonly used method in gravity and magnetic data processing, and the model processing results are shown in the appendix image 3 . According to the 8 steps described in the summary of the invention, according to the attached figure 1 As shown in the processin...

Embodiment 2

[0076] attached to Figure 5The shown Bouguer gravity anomaly data in the Huanghua Depression and its surrounding areas have been processed with edge enhancement. The basic process is to carry out preliminary processing such as correction on the data obtained by the actual measuring instrument, and then use it as the data input of module 1 to perform gravity and magnetic anomaly edge enhancement processing based on the transition zone and superposition, and finally combine the actual geological data of the study area to obtain The technical effect is different from that of the prior art. Since only gravity data is used in this embodiment, the grid gravity and magnetic data matrix A is renamed as grid gravity data matrix A below.

[0077] (1) Data input (module 1): Obtain the gravity anomaly data in the study area, perform various routine corrections and corrections, and obtain the grid gravity data matrix A, which is used as the input port in module 1. Transform the outliers...

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Abstract

The invention provides a potential field anomaly edge enhancement method based on a transition zone and phase congruency. The method is applied to researches of determination geologic body edge positions through potential field (gravity field and magnetic field) anomaly. Judgment of edge positions of underground anomalous bodies is achieved through the steps of improved calculation of co-occurrence matrixes, determination of transition zone anomalous ranges, calculation of thresholding contrast, extraction of phase congruency information, fusion processing of the thresholding contrast and the phase congruency information, judgment of gravity and magnetic data processing results and the like. According to the method, the thresholding contrast and the congruency information are fused, edge positions are guaranteed through enhancement of transition zones, and sensitivity of phase congruency information to weak anomaly can be used simultaneously. The method has the advantages of being capable of highlighting the edge anomaly and revealing subtle differences, and high in accuracy and resolving power.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and relates to an edge enhancement method based on a transition zone and superimposed potential field (gravity field and magnetic field) anomaly, which can be used to determine the edge position of the corresponding geological body, so that the underground can be effectively analyzed Geological bodies are described in detail. Background technique [0002] Applying geophysical data to accurately locate the edge of subsurface geological bodies is an important task in geological-geophysical interpretation. It can not only describe lithological changes, but also provide rich subsurface geological information about structural systems and deformation styles. information. When studying the lateral inhomogeneity of geological targets, especially the edge position of geological targets, the gravitational potential field and magnetic potential field in geophysical exploration methods have ...

Claims

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Application Information

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IPC IPC(8): G01V11/00
Inventor 张丽莉郝天珧江为为
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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