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Method and device for extracting diffracted wave

A diffraction wave and seismic wave technology, applied in the field of diffraction wave extraction methods and devices, can solve problems such as distortion, incomplete diffraction wave information, and inability to distinguish the types of geological anomalies.

Active Publication Date: 2018-03-30
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a method and device for extracting diffracted waves, so as to alleviate the problem that the obtained diffracted wave information is not comprehensive enough in the existing diffracted wave extraction method, and there is serious distortion, which makes it impossible to distinguish Technical Problems of Types of Geological Anomalies

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  • Method and device for extracting diffracted wave

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Embodiment 1

[0072] A method for extracting diffracted waves, refer to figure 1 , the method includes:

[0073] S102. Obtain the instantaneous phase of the seismic wave, which is the attribute data of the seismic wave;

[0074] In the embodiment of the present invention, the instantaneous phase is the attribute data of the seismic wave, specifically, the instantaneous phase is represented by θ(x, t).

[0075] The following is a brief introduction to diffracted waves: For diffracted waves, they can be divided into two types according to the types of geological anomalies. One is the diffracted waves without polarity reversal caused by scatterers (such as cracks); the other is the diffracted waves with polarity reversals caused by diffracters (such as faults). The so-called polarity reversal refers to a diffraction wave with hyperbolic characteristics, the data on the left side of the apex of the diffraction wave (that is, the apex of the hyperbola) is negative, and the data on the right si...

Embodiment 2

[0146] A device for extracting diffracted waves, refer to Figure 6 , the device consists of:

[0147] The acquisition module 11 is used to acquire the instantaneous phase of the seismic wave, and the instantaneous phase is the attribute data of the seismic wave;

[0148] The modified moving vertex Radon transform module 12 is used to correct the moving vertex Radon transform on the instantaneous phase to obtain the location information of the geological anomaly, wherein the location information includes the location of the geological anomaly and the root mean square velocity at the location of the geological anomaly ;

[0149] The extraction module 13 is configured to extract the left branch of the diffracted wave and the right branch of the diffracted wave according to the positioning information to obtain the diffracted wave.

[0150] In the diffracted wave extraction device of the present invention, the instantaneous phase of the seismic wave is first obtained, and then ...

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Abstract

The invention provides a method and a device for extracting a diffracted wave. The method comprises the steps of acquiring an instantaneous phase of a seismic wave; performing correction movable summit Radon transform on the instantaneous phase, and obtaining positioning information of a geological abnormal member; respectively extracting the left branch and the right branch of the diffracted waveaccording to the positioning information, and obtaining the diffracted wave. According to the method of the invention, the position of the geological abnormal member and the corresponding root mean square velocity can be obtained, thereby realizing more comprehensive diffracted wave information. The left branch and the right branch of the diffracted wave can be respectively extracted according tothe positioning information so that the original polarities of the extracted left branch and the extracted right branch of the diffracted wave are kept, namely the polarity reversal characteristic ofthe diffracted wave can be restored, thereby obtaining the high-fidelity diffracted wave, and determining the kind of the geological abnormal member according to the polarity reversal characteristicof the diffracted wave. The method and the device settle technical problems of no comprehensive diffracted wave information, severe distortion and incapability of determining the kind of the geological abnormal member.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method and device for extracting diffracted waves. Background technique [0002] When the seismic wave encounters a geological discontinuity point (such as a breakpoint, stratum pinch-out point, crack, collapse column, etc.) or scattered waves. Therefore, the high-resolution detection of geological anomalies can be realized by using the diffraction wave exploration technology. In the mining of coal, oil and other mineral resources, accurate prediction of geological anomalies can effectively improve the recovery rate of mineral resources and reduce hazards such as water inrush, gas outburst, and roof collapse. Therefore, the diffraction wave extraction technology has important research significance in the accurate positioning and high-resolution imaging of geological anomalies. [0003] Plane wave decomposition is one of the commonly used diffraction wave separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36G01V1/28
CPCG01V1/28G01V1/366
Inventor 李闯建彭苏萍赵惊涛杜文凤崔晓芹
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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