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Method for separating and de-noising wave fields of longitudinal and transverse earthquake waves

A technology for seismic data and determination methods, applied in the direction of seismic signal processing, etc., can solve the problems of effective signal destruction, limited application space, and hindering the extraction of geological information.

Inactive Publication Date: 2010-11-24
XI'AN PETROLEUM UNIVERSITY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Almost all existing methods only use singular value decomposition single method technology to separate and denoise the seismic wave field, especially the seismic longitudinal wave and shear wave cannot be separated, the application space is limited, and the effective signal is easily damaged, which hinders the extraction of geological information

Method used

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  • Method for separating and de-noising wave fields of longitudinal and transverse earthquake waves
  • Method for separating and de-noising wave fields of longitudinal and transverse earthquake waves
  • Method for separating and de-noising wave fields of longitudinal and transverse earthquake waves

Examples

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Embodiment

[0101] Take a physical model with 100 seismic records and 2048 sampling points as an example to illustrate the implementation steps:

[0102] Step 1: Read the seismic data with 100 traces and 2048 sampling points in each trace into a two-dimensional array F 1 middle.

[0103] Step 2: According to the superposition velocity of longitudinal waves and the time-distance law of P-P reflected waves, the original seismic data F 1 Perform normal time difference correction to get L 1 . The normal time difference is determined by:

[0104] Δt = t - t 0 = t 0 2 + x 2 v P 2 - t 0

[0105] Where: Δt is the normal time difference of the P-P reflected wave, x is the offset distance...

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Abstract

The invention discloses a method for separating and de-noising wave fields of longitudinal and transverse earthquake waves. The method comprises the following steps of: reading earthquake data of a sampling point into a two-dimensional array; performing normal time difference correction on the primary earthquake data; decomposing singular values of the earthquake data after the primary normal time difference correction; extracting singular value reconstruction signals of target signals; performing normal time difference back correction on the reconstructed data; outputting the data after the normal time difference back correction according to an earthquake data format during inputting so as to realize earthquake P-P wave separation and de-noising; performing normal time difference correction on earthquake records after the P-P wave is separated; decomposing singular values of the earthquake records after the secondary normal time difference correction; extracting the singular value reconstruction signals of the target signals; performing normal time difference back correction on the reconstructed data; outputting the data after the normal time difference back correction according to the earthquake data format during inputting so as to realize earthquake P-S wave field separation and de-noising; and outputting the data after the normal time difference back correction according to the earthquake data format during inputting. The method has the characteristic of thoroughly separating the longitudinal and transverse earthquake waves.

Description

technical field [0001] The invention belongs to the technical field of seismic data processing, in particular to a method for realizing separation and denoising of seismic longitudinal and transverse wave fields based on the combination of Normal Move Out (NMO for short) and Singular Value Decomposition (SVD for short) And technology. technical background [0002] The seismic wave field is very complex. When a single type of seismic wave is excited, when it encounters the elastic interface, the wave field will be converted to form a converted wave; It will bring many regular and irregular interference signals, which seriously affects the extraction of geological information. The separation and de-noising of seismic longitudinal and shear wave fields is very important. It is the premise and guarantee for improving the signal-to-noise ratio and resolution of seismic data, and is also the basis for fine extraction of seismic attribute information. SVD filtering is to optimize...

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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