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Method for suppressing interference of neutral line of prestack seismic signal based on curvelet transform

A curvedlet transform and pre-stack seismic technology, applied in seismic signal processing and other directions, can solve problems such as large computational complexity, and achieve the effect of simple suppression and reduction of damage.

Inactive Publication Date: 2011-08-03
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, this signal representation needs to solve the optimization problem on the complete library, and the computational complexity is very large

Method used

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  • Method for suppressing interference of neutral line of prestack seismic signal based on curvelet transform
  • Method for suppressing interference of neutral line of prestack seismic signal based on curvelet transform
  • Method for suppressing interference of neutral line of prestack seismic signal based on curvelet transform

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Embodiment

[0051] A specific embodiment of the present invention is a method for suppressing linear interference in pre-stack seismic signals based on curvelet transform, the steps are as follows:

[0052] A. Curvelet transform

[0053] The curvelet transform coefficient c is obtained by performing curvelet transform on the prestack seismic signal F D j，l，k ,

[0054]

[0055] In the formula, CT(F) is the curvelet transform of F; f(t 1 , t 2 ) are the discrete sampling points on the pre-stack seismic signal F, It is the conjugate function of the discrete curvelet kernel function, j=1, 2,..., n is the scale parameter, l=1, 2,..., L is the direction parameter, L takes 16 or 32, k=(k 1 , k 2 ), is the displacement parameter, k 1 = 1, 2, ..., M; k 2 =1, 2, ..., N; M is the number of traces of pre-stack seismic signal F, N is the number of time sampling points, ( represents the rounding down operation).

[0056] B. Generation of sub-images

[0057] Fix each scale j, and tran...

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Abstract

The invention discloses a method for suppressing the interference of a neutral line of a prestack seismic signal based on curvelet transform. The method comprises the following steps of: firstly, performing sparse representation on the seismic signal through curvelet transform; secondly, analyzing all coefficient matrixes to obtain frequency layers and directional ranges in which linear interference and effective signals are respectively located, wherein three cases are disposed as follows: 1, for the frequency layers and the direction in which only the linear interference is located, the corresponding curvelet coefficient is set to be 0; 2, for the frequency layers and the direction in which the effective signals and linear interference coexist, the threshold of the curvelet coefficient is suppressed; and 3, for the frequency layers and the direction in which the linear interference is not located, the coefficient keeps unchanged; and finally, performing curvelet transform to obtain a suppressed prestack seismic signal. By the method, the linear interference can be effectively suppressed, and the damage to the effective signals can be reduced to the greatest extent. Moreover, the method has the advantages of simplicity and rapidness.

Description

technical field [0001] The invention relates to a method for suppressing linear interference in pre-stack seismic signals. Background technique [0002] Geophysical exploration is to detect geological conditions such as stratum lithology and geological structure by studying and observing changes in various geophysical fields. [0003] The most commonly used and most effective method in geophysical prospecting is seismic prospecting. The principle of seismic exploration is to use the characteristics of artificially excited seismic waves to propagate in strata with different elasticity to survey the underground geological conditions. The seismic signals collected in the field of seismic exploration are called pre-stack seismic signals. [0004] Due to the phenomenon of reflection or refraction during the propagation of seismic waves, different waves will superimpose and interfere with each other, resulting in various noise interference. As one of the common noise interferen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 林煜东和红杰尹忠科周黎霞王建英
Owner SOUTHWEST JIAOTONG UNIV
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