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Earthquake high resolution processing method based on inversion of variable wavelet reflection coefficients

A technology of reflection coefficient and processing method, which is applied in the direction of seismic signal processing, etc., can solve the problem of low seismic resolution and representation accuracy

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] In order to solve the problem of low seismic resolution representation accuracy in the prior art, the present invention provides a seismic high-resolution processing method based on variable wavelet reflection coefficient inversion

Method used

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  • Earthquake high resolution processing method based on inversion of variable wavelet reflection coefficients
  • Earthquake high resolution processing method based on inversion of variable wavelet reflection coefficients
  • Earthquake high resolution processing method based on inversion of variable wavelet reflection coefficients

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Embodiment Construction

[0065] Such as figure 1 As shown, the seismic high-resolution processing method based on variable wavelet reflection coefficient inversion, the specific steps of the method are,

[0066] Step 1, obtaining shallow seismic data;

[0067] Seismic records within the range of 0 to 500 meters of formation depth are intercepted, that is, the shallow seismic records are obtained, the sampling interval is 2 ms, and the time domain length of the shallow seismic records is 30 ms.

[0068] Step 2. Obtain the shallow seismic wavelet and the time-domain length of the shallow seismic wavelet:

[0069] Perform Fourier transform on the shallow seismic data or well data to obtain the frequency spectrum of the shallow seismic data; filter the frequency spectrum of the shallow seismic data, and perform inverse Fourier on the filtered frequency spectrum leaf transform, and extract the real part of the inverse Fourier transform result, that is, to obtain the shallow seismic wavelet and the time d...

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Abstract

The invention discloses an earthquake high resolution processing method based on inversion of variable wavelet reflection coefficients. The processing method is a method for expanding frequency bands of earthquake records and is used for improving time resolution of the earthquake records. The processing method includes the steps of extracting shallow earthquake wavelets and wavelet time domain length according to the earthquake records, setting time windows and extracting an instant wavelet in each time window, establishing a variable wavelet convolution model of a frequency domain according to a wavelet convolution model of a time domain, for each earthquake record, setting model parameters for the instant wavelets and the variable wavelet convolution model and obtaining the reflection coefficients through inversion, and finally carrying out convolution processing on the initially extracted shallow earthquake wavelets and the reflection coefficients and obtaining the earthquake records with expanded frequency bands. The earthquake high resolution processing method expands the band frequency range of earthquakes, obviously improves the time resolution of the earthquakes, improves accuracy of seismic exploration work and provides a technical basis for accurate earthquake exploration and reducing risks of oil exploration.

Description

technical field [0001] The invention relates to a seismic data optimization method in geophysical exploration of oil and gas, in particular to a seismic high-resolution processing method based on variable wavelet reflection coefficient inversion. Background technique [0002] With the continuous deepening of oil and gas exploration, many reservoirs, especially stratum reservoirs, are relatively small in volume, and the seismic resolution must be improved to identify the above reservoirs. [0003] Commonly used methods to improve seismic time resolution include deconvolution processing, seismic spectrum whitening processing, and frequency domain extension processing technology. The above methods all increase the seismic frequency components within the limited frequency band of the seismic data, but the bandwidth of the seismic frequency band is not widened. [0004] The seismic spectrum inversion method that has appeared in recent years is to invert the reflection coefficien...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 王小品林庆富
Owner CHINA PETROLEUM & CHEM CORP
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