A seismic frequency spectrum reconstruction method

A spectrum and seismic signal technology, applied in the field of geophysical exploration, can solve problems such as relying on personal experience, limited application of big data, inaccuracy, etc., and achieve good stability.

Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, Tomasso uses manual picking of spectral components and amplitudes, which is inaccurate and heavily dependent on personal experience, and is also limited for large data volume applications.

Method used

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  • A seismic frequency spectrum reconstruction method

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, the seismic spectrum reconstruction method of the present invention comprises the following steps:

[0033] (1) select wavelet spectrum form, this wavelet spectrum form is the Ricker wavelet amplitude spectrum form defined by formula (1):

[0034] Formula 1),

[0035] in a is the peak amplitude of the wavelet spectrum, m is the peak frequency of the spectrum, and f is the frequency (the formula R(m, f) is the amplitude value calculated when the frequency is f), so the amplitude spectrum of the Ricker wavelet is determined by the parameter Set ξ={a, m} (if different wavelets are selected, different parameter sets will be used, the Ricker wavelet is only determined by two parameters {a, m}, if other wavelets are used, this wavelet will be used The corresponding several parameters can be used to form a parameter set) to d...

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Abstract

The invention provides a seismic frequency spectrum reconstruction method, and relates to the field of geophysical exploration. The method comprises the following steps: (1) obtaining a seismic signal x (t) and carrying out Fourier transformation on the seismic signal x (t) to obtain an amplitude spectrum X (f) of the seismic signal; (2) selecting a wavelet spectrum formula and picking up an original value of a peak frequency m of a wavelet spectrum; (3) calculating a peak amplitude a of the wavelet spectrum; (4) according to a maximum matching projection principle, carrying out local optimization on the peak amplitude a of the wavelet spectrum and the peak frequency m of the wavelet spectrum to obtain the locally-optimal peak amplitude of the wavelet spectrum and peak frequency of the wavelet spectrum; (5) substituting the peak amplitude a of the wavelet spectrum and the peak frequency m of the wavelet spectrum into the wavelet spectrum formula to obtain an amplitude spectrum of wavelets; and using the locally-optimal peak amplitude a of wavelet spectrum and peak frequency m of the wavelet spectrum to reconstruct a seismic spectrum X(f) to obtain a reconstructed seismic frequency spectrum and residuals.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a seismic spectrum reconstruction method. Background technique [0002] Seismic spectrum imaging technology has become a reservoir characteristic interpretation technology, and has played an important role in seismic attribute analysis. The core of spectral decomposition is the time-frequency analysis method of the signal. Time-frequency analysis methods are generally divided into linear time-frequency analysis methods, bilinear time-frequency analysis methods and parametric time-frequency analysis methods. All time-frequency analysis methods have their own advantages and disadvantages. inherent advantages and disadvantages. The so-called "single-frequency information" calculated at each frequency in the frequency gather obtained by using the time-frequency analysis method is the superposition of information in a certain frequency band, and it reflects the information of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 陈科王鹏燕朱凌燕李娜
Owner CHINA PETROLEUM & CHEM CORP
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