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A Compensation Method for Vibroseis Frequency-Division Sweeping Frequency Band

A frequency band compensation and seismic source technology, applied in the field of geophysical exploration, can solve the problems of lack of scientific basis and rigorous quantitative process, etc., and achieve the effects of widening the frequency band range, improving seismic resolution, and compensating for absorption attenuation

Active Publication Date: 2016-08-10
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current nonlinear scanning parameters are all determined empirically and visually based on experimental data, lacking scientific basis, and no rigorous quantitative process. Even some articles in recent years have mentioned the quantitative selection of vibrator nonlinear scanning parameters, but It is not strictly quantitative, but an approximation

Method used

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  • A Compensation Method for Vibroseis Frequency-Division Sweeping Frequency Band
  • A Compensation Method for Vibroseis Frequency-Division Sweeping Frequency Band
  • A Compensation Method for Vibroseis Frequency-Division Sweeping Frequency Band

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Embodiment Construction

[0036] The present invention is further described below in conjunction with embodiment. The scope of the present invention is not limited by these examples, and the scope of the present invention is set forth in the claims.

[0037] Such as figure 2 As shown, it shows that a vibrator signal can be decomposed into countless simple harmonic signals, and countless different simple harmonic signals can form a pulse signal through superposition, which is also the theoretical basis of the vibroseis frequency division scanning frequency band compensation method .

[0038] Such as image 3 As shown, the entire 8-140Hz frequency band is divided into four independent frequency bands, namely, 8-40Hz, 39-71Hz, 70-102Hz and 101-140Hz.

[0039] Such as Figure 5 Shown are the seismic records of four independent frequency bands and reflection coefficients and the stacking results of seismic records corresponding to each frequency band. The stacking results show that this method is feasi...

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Abstract

The invention relates to a method for compensating a fractional frequency scanning frequency band of a controllable seismic origin. By collecting seismic data of a researched area and analyzing the spectrum of a target stratum of original data, frequency bands and energy required to be compensated are known and acquired. An absorption model is established in order to simulate viscoelastic medium values based on each independent frequency band technology. The scanning duration of each frequency band is counted and determined by a simulated result in order to compensate stratum absorption and expand the frequency bands. The method is used in high-resolution deep stratum exploration.

Description

technical field [0001] The present invention relates to geophysical prospecting technology, belongs to the technical field of vibroseis acquisition technology, and is a method for compensating formation absorption by quantitatively determining the scanning duration of different frequency bands of vibroseis, so as to widen the frequency band and improve the resolution. Background technique [0002] High resolution is the foundation of subtle oil and gas reservoir exploration. Due to spherical diffusion and formation absorption and attenuation, the energy of high-frequency components of seismic waves is seriously attenuated. Extend the scanning time of the high frequency band to achieve the purpose of improving the resolution. However, the current nonlinear scanning parameters are all determined empirically and visually based on test data, lacking scientific basis, and no rigorous quantitative process. Even some articles in recent years have mentioned the quantitative selectio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 肖云飞殷厚成姜宇东白俊雨
Owner CHINA PETROLEUM & CHEM CORP