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Elimination method of directional seismic wave distortion signal

A signal elimination and seismic wave technology, applied in the direction of seismic signal processing, etc., can solve the problems of high signal-to-noise ratio of original data and large amount of calculation

Inactive Publication Date: 2017-01-04
JILIN UNIV
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Problems solved by technology

[0005] CN103984019A "Local Correlation Weighted Seismic Beam Synthesis Method" proposes a method for eliminating directional seismic wave distortion. The working principle of this method is to simultaneously suppress distortion during the process of synthesizing directional seismic waves. The amount is large, and there is a large error under the condition of low signal-to-noise ratio of the original data

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  • Elimination method of directional seismic wave distortion signal
  • Elimination method of directional seismic wave distortion signal
  • Elimination method of directional seismic wave distortion signal

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and embodiment do further detailed description:

[0026] In this embodiment with n=9, τ 1 = 1 ms, λ = 1, signal main frequency f = 60 Hz as an example to perform beam orientation and distorted signal elimination on 9-shot seismic records, but this method is not limited by the parameters given in the example.

[0027] The method for eliminating the directional seismic wave distortion signal comprises the following steps:

[0028] a. Input the continuous seismic records of n=9 shot points, denoted as U 1 (t, x), U 2 (t,x),...,U 5 (t,x),...,U 8 (t, x), U 9 (t,x);

[0029] b. Keep the m=5th shot record U 5 (t, x) remains unchanged (the delay is 0), and other shot records use the delay parameter τ 1 =1ms and track sorting parameter λ=1(d 1 = d 2 k is 1), and then perform equal interval delay and equal channel number sorting, and the delay and sorting results are U 1 (t-4τ 1 , x+4λ), U 2 (t-3τ 1 , x+3λ),..., U 5 (t...

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Abstract

The invention relates to a method for eliminating a distorted signal of a directional seismic wave. A directional seismic wave beam record is filtered by local correlation coefficients of the directional seismic wave beam record and an original center record, so that the distorted signal outside a main wave beam can be eliminated and the undistorted directional seismic wave beam record can be obtained. Compared with the prior art, under the circumstance that the signal-to-noise ratio of original data is low, directional seismic wave data is guaranteed to form high-quality data on an exploration target, and the distorted signal outside the main wave beam is effectively eliminated. The method has an important application value for improving the quality of seismic exploration data under a strong background noise interference condition.

Description

Technical field: [0001] The invention relates to a method for eliminating distortion signals of seismic data, in particular to a method for eliminating distortion signals outside the main beam direction of directional seismic wave data under the condition of low signal-to-noise ratio. Background technique: [0002] The idea of ​​beam steering originated from the field of phased radar. Since the beam directional method can effectively strengthen the effective signal on the target body, it was soon introduced into the field of seismic exploration. Seismic beamforming was initially implemented at the source end, and then a seismic beamforming method based on the receiving end was proposed. The relevant patents involved mainly include: [0003] CN101320095 discloses a "single source directional illumination seismic signal synthesis method"; CN101339252 "directional illumination seismic exploration method based on single source"; CN102590861A "seismic beamforming method based on...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 姜弢贾海青陈振振徐学纯林君
Owner JILIN UNIV
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