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Method for estimating mixed-phase seismic wavelets of frequency domain

A seismic wavelet and mixed-phase technology, applied in the field of geophysical exploration, can solve problems such as difficult seismic wavelet estimation

Active Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to be directly used to estimate the seismic wavelet phase

Method used

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  • Method for estimating mixed-phase seismic wavelets of frequency domain
  • Method for estimating mixed-phase seismic wavelets of frequency domain
  • Method for estimating mixed-phase seismic wavelets of frequency domain

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Experimental program
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Embodiment Construction

[0042] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0043] (1) if figure 1 As shown in Fig. 1, an analysis time window (2.2s-2.6s) is first selected for a certain well (grey) 2D seismic section. The data volume in the time window is divided into 10 groups, and the seismic data tracks in each group are connected end-to-end as data to be processed x(t), t=0,1...,N.

[0044] (2) calculation figure 2 The autocorrelation function of the data x(t) shown

[0045] c ( t ) = Σ τ = 0 N - t x ( t ) x ( t + τ ) - - - ( ...

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Abstract

The invention provides a method for estimating mixed-phase seismic wavelets by using high-order cumulants of frequency domain seismic data. The method can accurately estimate the mixed phase of the seismic wavelets by comprehensively utilizing two-dimensional Fourier transformation, two-dimensional phase unwrapping, linear inversion and the like. Influences imposed on the estimation result of the wavelets by noises are effectively reduced by combining a series of technical processes, and the applicability of the wavelets in a certain space range is improved.

Description

technical field [0001] The invention belongs to geophysical prospecting technology, and relates to a high-precision estimation method of seismic wavelets in seismic prospecting. Background technique [0002] Seismic wavelet estimation is an important technique in reflection wave seismic exploration. Whether it is seismic wave field simulation, seismic data deconvolution processing, or seismic inversion, clear seismic wavelet information is required. Therefore, the estimation result of seismic wavelet needs very high precision. [0003] Seismic wavelets excited by artificial sources usually have fixed amplitude spectrum and phase spectrum. Due to the effects of source effect, distortion and attenuation in the process of propagation in the underground medium, the amplitude and phase of the seismic wavelet will change in the process of propagation in the underground medium. Therefore, the final observed seismic wavelet is usually not the ideal minimum phase or zero phase, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 张峰李向阳
Owner CHINA UNIV OF PETROLEUM (BEIJING)