Seismic signal time-frequency decomposition method based on short-time fractional Fourier transform

A technology of time-frequency decomposition and seismic signal, which is applied in the direction of seismic signal processing, etc., can solve the problem of unsatisfactory decomposed signal spectrum effect, and achieve the effect of overcoming spectrum cross-term interference, accurate and reliable spectrum, and simplifying workload

Inactive Publication Date: 2015-03-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0027] As mentioned above: the Wigner-Willi distribution has good energy aggregation for single-component signals, but for multi-component signals, due to its inherent bilinear nature, this time-frequency decomposition has serious cross terms, It is unfavorable for the detection of some weaker useful components in seismic signals. Short-Time Fourier Transform can avoid the occurrence of cross terms, but the effect of decomposing signal spectrum is not good under the condition of low signal-to-noise ratio seismic signals. ideal

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  • Seismic signal time-frequency decomposition method based on short-time fractional Fourier transform
  • Seismic signal time-frequency decomposition method based on short-time fractional Fourier transform
  • Seismic signal time-frequency decomposition method based on short-time fractional Fourier transform

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[0042] A seismic signal time-frequency decomposition method based on short-time fractional Fourier transform, such as figure 1 As shown, including the following steps:

[0043] (1) Obtain one-dimensional seismic signal

[0044] The seismic signal is a typical non-stationary signal. The seismic signal is generally organized in units of seismic traces and stored in the SEG-Y file format. The SEG-Y format is one of the standard tape data formats proposed by the Society of Exploration Geophysicists (SEG). It is one of the most common formats for seismic data in the petroleum exploration industry. A typical seismic trace contains some low-frequency noise, such as surface waves, and some high-frequency environmental noise; useful seismic reflection energy is often limited to 10-70Hz, and the dominant frequency is around 30Hz. This frequency band is basically in the middle and low frequency range, so higher frequency resolution is required for analysis; at the same time, the specific na...

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Abstract

The invention discloses a seismic signal time-frequency decomposition method based on short-time fractional Fourier transform. A Gaussian window function is selected; high frequency resolution is obtained by adjusting the window width in a self-adapting way; through the characteristic of fractional kernel function angle rotation, the best energy accumulation of the seismic signal is obtained at the optimal rotation angle and the cross term is eliminated; the higher frequency resolution and more accurate frequency location are more conductive to recognizing specific geologic structure, so that the method solves the defects of the existing seismic signal time-frequency decomposition method. The method has the positive effects of overcoming the defects of traditional algorithm such as short-time Fourier and Wigner-Ville distribution and the like and having great significance on seismic signal spectral analysis.

Description

Technical field [0001] The invention relates to a seismic signal time-frequency decomposition method based on Short Time Fractional Fourier Transform (STFrFT). Background technique [0002] In seismic exploration, when a seismic wave propagates in the underground medium, its propagation path, vibration intensity and waveform will undergo complex changes with the elastic properties and geometry of the medium that it passes through. Therefore, the ground will receive signal components such as p-waves, s-waves, divergent surface waves of larger amplitude, and various noises propagating through different paths. They not only have different arrival times, but also have different kinematic and dynamic characteristics, and pass In addition, the absorption and attenuation of different frequency components by the underground medium are also different. Therefore, the seismic signal is a typical non-stationary signal, and its spectral components and various statistical characteristics of t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 钱峰黄佳胡光岷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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