Seismic wave decomposition method

A seismic wave and decomposed technology, applied in the fields of geophysical exploration and petroleum geophysical exploration, can solve problems such as slow calculation speed

Active Publication Date: 2011-07-06
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

Therefore, the existing seismic wave decomposition method using matching pursuit technology has problems: 1. Due to a large numbe

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Embodiment Construction

[0021] The seismic wave decomposition method provided by the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, according to an embodiment of the present invention, a seismic wave decomposition method is provided, including:

[0023] 1) Select the wavelet form, which is the Gabor wavelet form defined by formula (1):

[0024] g r ( t ) = w ( t - u σ ) exp [ i ( ω ( t - u ) ) + φ ] Formula 1),

[0025] Where g r (t) is the Gabor wavelet function, w(·) represents the Gaussian window function, u is the time shift, σ is the length of the time axis, ω is the center frequency, φ is the phase shift, and i is the imaginary unit; the wavelet form can be selected from A series of wavelets or wavelet atoms matching seismic signals are selected from the Gabor wavelet dictionary, discrete Dirac function, and discrete Fourier function based on comp...

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Abstract

The invention relates to a seismic wave decomposition method which comprises the following steps: selecting a Gabor small wave or a Morlet small wave as a wavelet form; carrying out multiwavelet decomposition on an obtained seismic signal; calculating three parameters of the small wave, namely time shift u, center frequency Omega, phase shift Phi through the complex attribute of the seismic signal in each decomposition; calculating a time scale parameter Sigma according to the three parameters; estimating the amplitude Alpha of the small wave; and determining a final parameter through iteration and decomposing wavelets with different dominant frequencies. The seismic wave decomposition method improves the traditional matched tracking method and improves the calculation efficiency; and meanwhile, Sigma is self-adaptive and adjustable.

Description

Technical field [0001] The invention relates to the field of geophysical prospecting, and more particularly, to a seismic wave decomposition method in the field of petroleum geophysical prospecting. Background technique [0002] Seismic exploration technology is a geophysical exploration method that uses elastic vibration to study the elastic difference of different rocks in the formation to understand the distribution of the formation and the geological structure. It is mainly used in oil and natural gas exploration and development, mineral resources surveys, engineering geological surveys, etc. The field is also the most common and effective way to find oil storage traps in petroleum exploration. The underground information provided by the earthquake can not only effectively divide the trap range, but also study and judge the rock properties and fluid properties of the formation, and even extend to the description of reservoir characteristics. At present, there are a variety o...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 甘其刚许多唐建明徐天吉叶泰然程冰洁蒋能春蔡军兰
Owner CHINA PETROLEUM & CHEM CORP
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