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Seismic data space-variant generalized wavelet extraction method

A seismic data and extraction method technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as limited application, large amount of calculation, poor stability, etc., and achieve simple shape, stable operation, and strong anti-noise ability Effect

Active Publication Date: 2020-07-17
王仰华
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Problems solved by technology

However, due to the need to calculate high-order statistics and perform numerical analysis operations on high-order statistics, the wavelet estimation method has a huge amount of calculation and poor stability, which severely limits the application of this method in the analysis of actual seismic data. application

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  • Seismic data space-variant generalized wavelet extraction method
  • Seismic data space-variant generalized wavelet extraction method
  • Seismic data space-variant generalized wavelet extraction method

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Embodiment Construction

[0026] The steps of the method for extracting the space-variable generalized wavelet of seismic data in the present invention include: (1) estimating the initial parameters of the space-variable wavelet according to the seismic data power spectrum; (2) determining the global generalized wavelet reference frequency; (3) estimating The space-variable fractional value of the generalized wavelet; (4) optimize the global generalized wavelet reference frequency; (5) optimize the space-variable fractional value of the generalized wavelet; (6) construct the space-variable seismic generalized wavelet. The present invention hereby proposes to adopt Wang's generalized wavelet theory to characterize the space-varying wavelets extracted from actual seismic data, because the characteristic of this theory is that only two parameters are needed to define asymmetric generalized seismic wavelets (Generalized seismic wavelets. Geophysical Journal International , vol:203 / 2015 / the inventor). The ...

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Abstract

The invention relates to a seismic data space-variant generalized wavelet extraction method, and aims to solve the problem that seismic wavelets extracted in the prior art cannot truly reflect energyattenuation, phase distortion and spatial change characteristics of seismic signals, and the method comprises the following steps: (1) estimating initial parameters of space-variant wavelets accordingto a seismic data power spectrum; (2) determining a global generalized wavelet reference frequency; (3) estimating a space-variant fractional order value of the generalized wavelet; (4) optimizing the global generalized wavelet reference frequency; (5) optimizing the space-variant fractional order value of the generalized wavelet; and (6) constructing a space-variant seismic generalized wavelet.The invention has the advantages that the extraction method is stable in operation and high in anti-noise capacity, the extracted seismic generalized wavelet is concise in form, and the extracted wavelet can truly reflect space-variant features such as absorption attenuation of seismic signals in the stratum medium propagation process.

Description

technical field [0001] The invention relates to a method for extracting seismic data wavelets, in particular to a method for extracting seismic data space-varying generalized wavelets. Background technique [0002] The seismic wavelet should reflect the wave distortion and other effects caused by the absorption and attenuation of the viscoelastic medium of the formation during the propagation of the seismic wave in the formation. The formation viscoelastic medium has a filtering effect on the seismic signal, and the energy of the seismic signal is gradually absorbed and attenuated by the formation medium during the propagation process of the underground medium, and the absorption and attenuation degrees of different frequency components of the signal are also different. What is more important is that the seismic signal also produces phase distortion when the energy is attenuated, because the propagation speed of different frequency components of the signal is not the same, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor 王仰华
Owner 王仰华
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