Seismic wave compensation method constructed through frequency driving space-variant Q value model

A technology of seismic wave and space variation, applied in seismic signal processing and other directions, can solve the problems of high signal-to-noise ratio and limited applicability, and achieve the effect of restoring amplitude information, reducing calculation amount, and improving resolution and signal-to-noise ratio

Active Publication Date: 2016-10-12
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

The principle of the spectral ratio method is simple, but it requires the seismic wave to have a high signal-to-noise ratio, and the seismic wavelets at the two time points of the top and bottom interfaces are not interfered by other wavelets nearby, which limits the applicability of this method to calculate the Q value sex

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  • Seismic wave compensation method constructed through frequency driving space-variant Q value model
  • Seismic wave compensation method constructed through frequency driving space-variant Q value model
  • Seismic wave compensation method constructed through frequency driving space-variant Q value model

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[0034] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] Extracting Q value from seismic data information is an important idea. Post-stack seismic data is processed, and each step cannot be guaranteed to be true amplitude processing, and the accuracy of estimating formation attenuation based on the amplitude or energy changes of seismic data is limited. Relatively speaking, the processing has little damage to the frequency components. For example, the wavelet stretching and cuttin...

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Abstract

The invention discloses a seismic wave compensation method constructed through a frequency driving space-variant Q value model. A time frequency spectrum corresponding to each sample point of time domain seismic data is generated through Gabor transformation, center frequencies are calculated point by point, and attenuation values Q<-1> are estimated through the center frequencies. Quality factor Q values are reciprocals of the attenuation values Q<-1>, a Q value model constructed therefore is continuous and spatially variant, and the calculation process is stable and highly efficient. Based on this, high-precision seismic wave attenuation compensation is realized, the problems of amplitude attenuation and phase distortion of seismic data are solved, and the resolution and signal-to-noise ratio of the seismic data are improved.

Description

technical field [0001] The invention relates to the field of seismic signal processing, in particular to a seismic wave compensation method for building a frequency-driven space-varying Q-value model. Background technique [0002] When the seismic wave propagates from shallow to deep, the filtering effect of the earth medium causes the absorption and attenuation of the seismic wave, causing the amplitude of the seismic wave to weaken, the waveform to be distorted, the frequency band to be narrowed, and the main frequency to be reduced. This rock physical property of the underground medium is usually closely related to the quality factor Q value. relevant. Studying and estimating the quality factor Q value and compensating the seismic wave can eliminate the attenuation of the seismic wave during propagation, restore the reflection coefficient characteristics of the underground rock formation in the seismic signal and improve the resolution of the seismic data. [0003] Seism...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 李宗杰王仰华王建斌杨子川马学军李赋斌费建博胡鹏飞闫艳琴周刚张庆陈松杨威
Owner CHINA PETROLEUM & CHEM CORP
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