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Method for separating and denoising seismic wave field

A technology of seismic wave field and seismic trace, applied in the direction of seismic signal processing, etc., can solve problems such as limited application space, effective signal destruction, and influence on effective information extraction

Inactive Publication Date: 2011-09-21
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods almost only use SVD single method technology to separate and denoise the seismic wave field, the application space is limited, and the effective signal is easily damaged, which affects the extraction of effective information

Method used

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  • Method for separating and denoising seismic wave field
  • Method for separating and denoising seismic wave field
  • Method for separating and denoising seismic wave field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Take a ray tracing model as an example to illustrate the implementation steps of this example:

[0085] Step 1: Read seismic data with 60 traces, each with 600 sampling points, into a two-dimensional array F 1 middle;

[0086] Step 2: Convert the original seismic data F 1 Perform linear correction to get L 1 :

[0087] Linear correction is performed for the event axis of the direct wave. Given the apparent velocity value of the direct wave of 1400m / s, the linear normal time difference is determined for each seismic trace through the relationship between the velocity and the offset. Time shift; the determination method of linear correction time difference is:

[0088] ΔT = x V T

[0089] Where: ΔT is the linear correction time difference, V T is the apparent velocity of the event axis to be corrected, and x is the offset distance;

[0090] Linear correction is performed on the event...

Embodiment 2

[0122] Take an actual seismic data as an example to illustrate the implementation steps of this example:

[0123] Step 1: Read seismic data with 228 traces and 2112 sampling points in each trace into a two-dimensional array F 1 middle;

[0124] Step 2: Convert the original seismic data F 1 Perform linear correction to get L 1 :

[0125] Linear correction is performed on the event axis of the reflected P-P wave. The realization method is to determine the linear correction time difference for each seismic trace on the basis of its time interval law, and then perform time shift for each data of each seismic trace; linearly correct the time difference is determined by:

[0126] ΔT = x V T

[0127] Where: ΔT is the linear correction time difference, V T is the apparent velocity of the event axis to be corrected, and x is the offset distance;

[0128] Linear correction is performed for the even...

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Abstract

The invention discloses a method for separating and denoising a seismic wave field, comprising the following steps of: 1, reading seismic data, including m channels with each having n sampling points, into a two-dimensional array F1; 2, subjecting original seismic data F1 to linear correction to obtain L1; 3, subjecting the linearly-corrected seismic signal L1 to singular value decomposition; 4, processing a singular value series sigma1, and extracting a singular value sigma 2 reconstruction signal of a target signal to obtain L2; 5, subjecting the reconstructed signal L2 to linear inverse moveout correction in accordance with the time-distance rule of seismic wave velocity and seismic signals to obtain F2, and returning to an input data field; and 6, outputting the data F2 subjected to linear inverse correction in a seismic data format during input, thus separating and denoising seismic wave field are completed by combining linear correction with singular value decomposition. The method has the characteristic of thorough wave field separation.

Description

technical field [0001] The invention belongs to the technical field of seismic wave processing, in particular to a seismic wave field separation and denoising method based on the joint realization of Linear Correction (LineNormal Move Out, LNMO for short) and Singular Value Decomposition (SVD for short). technical background [0002] The seismic wave field is very complex. During the acquisition of seismic data in the field, the influence of various external interference factors and the propagation properties of the seismic wave itself will bring in many regular and irregular interference signals; in addition, some processing methods and methods for indoor processing are also It will introduce a lot of noise, such as deconvolution, migration, etc., which seriously affects the extraction of geological information. Seismic wavefield separation and de-noising are very important. It is the premise and guarantee for improving the signal-to-noise ratio and resolution of seismic da...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 沈鸿雁
Owner XI'AN PETROLEUM UNIVERSITY
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