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A seismic attenuation estimation method, system, equipment and storage medium based on sparse s-transform and adaptive logarithmic spectral ratio method

An attenuation estimation and self-adaptive technology, applied in the field of exploration geophysics research, can solve the problems of Fourier transform spectrum noise interference, inaccurate Q value estimation results in the frequency domain, etc., to improve accuracy, enhance noise resistance, Q value-accurate effect

Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of earthquake attenuation estimation method, system, equipment and storage medium based on sparse S transform and adaptive logarithmic spectral ratio method, aim at solving the problem of earthquake in the prior art. The Fourier transform spectrum of the signal segment is susceptible to noise interference, and the defective technical problem of Q value estimation in the frequency domain is inaccurate

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  • A seismic attenuation estimation method, system, equipment and storage medium based on sparse s-transform and adaptive logarithmic spectral ratio method
  • A seismic attenuation estimation method, system, equipment and storage medium based on sparse s-transform and adaptive logarithmic spectral ratio method
  • A seismic attenuation estimation method, system, equipment and storage medium based on sparse s-transform and adaptive logarithmic spectral ratio method

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Embodiment

[0052] (1) Calculate the sparse S-transform time spectrum of the two-dimensional post-stack seismic data;

[0053] Read 2D post-stack seismic data. Select the single-channel seismic records to be estimated for seismic attenuation in the two-dimensional post-stack seismic data, figure 1 Synthetic noise-free seismic data with different Q values: (a) Q=30, (b) Q=40, (c) Q=50, (d) Q=60; Figure 7 For the synthetic noisy seismic data with different Q values, SNR=12dB: (a) Q=30, (b) Q=40, (c) Q=50, (d) Q=60; Figure 11 For the synthetic noisy seismic data with different Q values, SNR=5dB: (a) Q=30, (b) Q=40, (c) Q=50, (d) Q=60; figure 1 , Figure 7 and Figure 11 , denoted as u(t), then its S transform can be expressed as formula (1):

[0054]

[0055] in, is the frequency spectrum of S transform; τ is the time offset; f is the frequency; u(t) is the original seismic signal; w(τ-t, f) is the window function of sliding τ along time; e -i2πft is represented as a Fourier tra...

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Abstract

The invention discloses a seismic attenuation estimation method, system, equipment and storage medium based on sparse S transformation and adaptive logarithmic spectral ratio method, belonging to the research field of exploration geophysics. The invention uses sparse S transformation to solve the time spectrum of seismic data , compared with the traditional S transform, the time spectrum energy is more concentrated, which is beneficial to improve the accuracy of the Q value estimated by the logarithmic spectral ratio method; the present invention introduces an adaptive frequency band selection method, which avoids the artificial influence that may be caused by manually selecting the frequency band range. , which improves the reliability of the Q-value estimation results. Secondly, the invention uses sparse S transform, which has a certain inhibitory effect on noise, which makes it possible to avoid serious interference of noise when extracting the spectrum at the upper and lower layers of the target area and use the logarithmic spectral ratio method to estimate the Q value, and improves the Noise immunity of Q-value estimates.

Description

technical field [0001] The invention belongs to the research field of exploration geophysics, and in particular relates to a seismic attenuation estimation method, system, equipment and storage medium based on sparse S transform and adaptive logarithmic spectral ratio method. Background technique [0002] At present, the commonly used oil and gas exploration methods are still mainly based on the seismic wave analysis method, which uses the difference in the elasticity and density of the underground medium to infer the properties and shapes of the underground rock formations by observing and analyzing the response of the earth to artificially excited seismic waves. The elastic waves excited by artificial methods are used to locate mineral deposits and obtain engineering geological information. The seismic wavelet will be affected by the underground medium and will be attenuated during the propagation process, which is manifested as the reduction of amplitude and dominant freq...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G06F17/14
CPCG01V1/307G06F17/14
Inventor 刘乃豪魏圣焘杨阳高静怀王治国张浩然张宇新雷友波
Owner XI AN JIAOTONG UNIV
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