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S-Transform Time-frequency Analysis Technology and Its Application Research in Seismic Prospecting

Author: ZouWen
Tutor: GuHanMing
School: China University of Geosciences
Course: Earth Exploration and Information Technology
Keywords: S- transform Time-frequency analysis Surface wave suppression First break picking Geological cycles body Seismic facies Holes anomaly detection
CLC: P631.4
Type: Master's thesis
Year: 2005
Downloads: 874
Quote: 13
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Abstract


Fourier Transform and its inverse mapping between the signal time domain and frequency domain. The Fourier transform angle, respectively, from the time domain or frequency domain analysis of the signal, but not directly to both organic combination. For the nonstationary seismic signals, understand different moments near the frequency domain characteristics is crucial, therefore varying signal in the time-frequency joint presentation description, one-dimensional time-domain signals onto a two-dimensional time-frequency plane fully reflect seismic signal time-frequency characteristics. Traditional time-frequency analysis method has the defects of the method itself (short-term window of the Fourier transform of the window function is fixed, the wavelet transform is not a real time spectrum), the paper, we introduce a new time-frequency analysis method-S - transformation. In this paper, the traditional time-frequency analysis method. S-transform definition, derivation, the characteristics elaborated, and the two-dimensional S-transform and generalized S-transform. S-transform can export by the short-term window of the Fourier transform and continuous wavelet transform, which combines the the two transform advantage of, and avoid their shortcomings: it has a direct contact with the Fourier transform, with lossless reversible; and short-term windowed Fourier transform and wavelet transform is a linear time-frequency representation, so there is no interference of the cross meanings; S-transform has a variety of resolution, to overcome the lack of short-time window Fourier transform fixed resolution: In addition, S - transform contains phase factor, which do not have the characteristics of wavelet transform. In order to further understand the characteristics of the S-transform, we design some theoretical models, the S-transform comparative analysis of the short-time window Fourier transform and wigner-Ville distribution. Based on the basic theory, the first time the S-transform applied to some of the processing and interpretation of seismic exploration. Capacity to noise in seismic processing: the S-transform with high-frequency resolution, the first S-transform applied to seismic waves early to pick up, setting different signal-to-noise ratio of the theoretical seismogram detects the S-transform to identify early to , and applied to a low signal-to-noise ratio of the mountain tomographic static correction early to pick up; Secondly, the low frequency of seismic surface wave in the time-frequency plane with regional and S-transform lossless reversible S-transform suppress surface wave technology for record set theory and practical information. In seismic interpretation: First S-transform is applied to the the geological cycle body identification. Due to tectonic movements are cyclical,

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