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The Research and Application of Time Frequency Analysis in Seismic Signal Processing

Author: ChenYouLiang
Tutor: ZhouZhuSheng
School: Central South University
Course: Earth Exploration and Information Technology
Keywords: Time-frequency analysis Variable factor Spectral decomposition Low-frequency anomaly Hydrocarbon reservoir detection
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 133
Quote: 0
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Abstract


Time-frequency analysis method as a powerful tool for the analysis of non- stationary signals , has become a hot topic of modern signal processing research . This paper systematically introduces frequency analysis of the basic concepts , given several commonly used formula of time-frequency analysis methods , a detailed analysis of the short-time Fourier transform , wavelet transform , S transform generalized S transform , Wigner-Ville distribution of several methods the nature of the feature; generalized S transform Mansinha raised on the basis of the development of a new kind of time-frequency analysis method - with generalized S transform variable factor . Through the analysis of the same non-stationary signal processing , comparative study of the effects of the application of several time-frequency analysis method . The results show that , compared to other methods , the generalized S transform with variable factor more careful to reflect the local features of non- stationary signals , more purposeful and practical . Seismic signal is a non-stationary signals , time-frequency analysis method provides the joint distribution of the time domain and frequency domain information , which clearly describes the relationship between the frequency of seismic signals change over time . Frequency analysis method in this paper, when applied to the processing of the seismic data , model data analysis and processing , comparative study of the short-time Fourier transform , continuous wavelet transform , generalized s transform variable factor in the detection of thin-layer boundaries effects; the same time, the generalized S transform with variable factor applied to seismic profiles sub frequency processing and time-frequency filtering process , but also to achieve the desired effect . The paper also analyzes the layer thickness of the thin layer , the quality factor , the wave velocity , focal clocked at factors such as the peak frequency of the seismic waves . Actual seismic data processing , combining spectral decomposition and frequency analysis techniques , the use of low- frequency anomaly detection of the position of the oil and gas reservoirs , and achieved the desired results .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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