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Earthquake attenuation estimating method based on changes of spectrum area

A technology of attenuation estimation and spectral area, which is applied in the field of seismic attenuation estimation based on spectral area changes, can solve the problems of seismic data containing noise and difficult Q value estimation results, etc.

Active Publication Date: 2017-09-05
XI AN JIAOTONG UNIV
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Problems solved by technology

Under ideal conditions without noise, accurate and stable attenuation estimation results can be obtained; however, actual seismic data inevitably contain noise, and these conventional methods are difficult to obtain a stable Q value estimation result

Method used

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  • Earthquake attenuation estimating method based on changes of spectrum area
  • Earthquake attenuation estimating method based on changes of spectrum area
  • Earthquake attenuation estimating method based on changes of spectrum area

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Experimental program
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Embodiment

[0081] (1) Synthetic seismic data calculation example

[0082] First, we verify the effectiveness of the invention with noise-free and noisy synthetic seismic data. figure 1 It is noise-free synthetic seismic data, with a total of 100 seismic data, including two horizontal layers. The source wavelet is a zero-phase Ricker wavelet with a main frequency of 40 Hz. The time sampling interval is 1 millisecond. The Q value of the first layer is 200, and the Q values ​​of the second layer are 100 (track 1 to track 40), 30 (track 41 to track 60), and 60 (track 61 to track 100). First, we use the constant phase wavelet in formula (1) to estimate the source wavelet according to formula (2), and the result is as follows figure 2 so. figure 2 (a) The time-domain waveforms of the actual source wavelet and the estimated constant-phase wavelet (that is, the estimated source wavelet) are given, figure 2 (b) The Fourier spectra of the actual source wavelet and the estimated constant-ph...

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Abstract

The invention discloses an earthquake attenuation estimating method based on changes of a spectrum area. The method comprises the following steps of (1) utilizing a constant phase-position subwave to estimate an actual hypocenter subwave and the parameters of the actual hypocenter subwave; (2) calculating the Fourier spectrum area of the hypocenter subwave; (3) calculating the Fourier spectrum area of an attenuated subwave; (4) calculating the variations of the Fourier spectrum areas of the hypocenter subwave and the attenuated subwave; (5) calculating a relative value, Q, and estimating the attenuation of the earthquake data. The method utilizes the constant phase-position subwave to estimate the hypocenter subwave and obtain the estimated parameters, uses the estimated variations of the Fourier spectrum areas between the hypocenter subwave and the attenuated subwave to calculate and obtain the relative value, Q, and conducts an earthquake attenuation estimation and attenuation reservoir layer depiction. The attenuation estimation of synthetic seismic records with noises and without noises confirms the accuracy and the stability of the earthquake attenuation estimating method. The method can be applied in actual information, and the results of the attenuation estimation can depict a gas reservoir layer well.

Description

technical field [0001] The invention belongs to the field of signal processing, data processing and interpretation in geophysical prospecting, and relates to an earthquake attenuation estimation method based on spectral area change. Background technique [0002] The underground medium is a viscoelastic medium. The viscoelasticity of the medium makes the waveform of the seismic wavelet propagating in the underground medium broaden, the main frequency is reduced, the frequency band is narrowed, and the energy is gradually weakened and finally converted into heat energy. The loss of seismic wave energy is caused by many factors. Media with different saturation, permeability and porosity have different degrees of loss of seismic wave energy. The quality factor Q value is an important parameter to measure the attenuation characteristics of the medium, and can be used to indicate the oil and gas content of the formation. The formation attenuation estimated from seismic data can b...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 高静怀刘乃豪张波徐朝晖张国伟王前孙逢圆楼以怀
Owner XI AN JIAOTONG UNIV
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