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The Research on Matching Processing of Seismic Signals

Author: LongYun
Tutor: WuYanGang
School: Jilin University
Course: Earth Exploration and Information Technology
Keywords: Matching filter Waveform coherence Wavelet transform Random noise suppression Source
CLC: P631.4
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 1
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Abstract


With the advances in seismic exploration, use different sources to match the filter so that the amplitude and phase of the data line, or in different times and comparative analysis of seismic data. Paper to simulate different focal positions generated in the same seismic data filtering, it can be seismic data analysis and processing, can be a very good analysis of seismic attributes, such as the relationship between geological structure, a series of hydrocarbon key issues. In order to achieve the effectiveness of how the removal of different sources of this type, different surface conditions, different construction age of various objective factors such as construction parameters caused by differences in seismic data, has become the key to solve this problem.This article will develop a mature combination of wavelet transform and matched filtering, focus on the matched filter based on wavelet transform in seismic data in different data source and application of different times. Especially for the matching portion of the seismic data are discussed in detail and compared with the Wiener filtering, highlighting the wavelet domain filtering, greatly improved signal to noise ratio. Matched filtering in wavelet domain has been largely improved, not only to improve the utilization of the data, but also improves the removal of random noise in the data. Not only matched filtering to achieve the best results in the match, but also to the original data signal to noise ratio has improved a lot. With random noise on seismic convolution model for the effective simulation experiments show that the method is effective.Fourier transform is an important basis for seismic exploration, this wavelet-based maturity based on the theory of wavelet sub-band features. Matched filtering technology, the prospects are very broad. This according to the advantages of both the two together effectively, using their properties to solve some practical problems.In this paper, based on previous years through the effectiveness of the method on the matched filter method for effective comparison and interpretation, use LS algorithm to solve the wavelet matched filtering problem, this paper, seismic modeling data to verify the advantages of wavelet transform matched filtering to the Fourier transform matched filtering, so that theoretically shows the matched filter based on wavelet transform has better precision. In addition, this paper, the seismic data as a research point of random noise, some features of wavelet Fourier change is unattainable, especially in wavelet decomposition and reconstruction, that is, frequency characteristics. This characteristic of wavelet matched filtering of wavelet domain stochastic noise in the process of removing the same time reaching the matched filtering can also be a large degree of increased noise ratio. This is the time domain and frequency domain matched filter matched filtering are unable to effect. Finally, the use of wavelet matched filter with a random noise signal and noise to match the reference Road, obtained wavelet matched filter can effectively remove the random noise. And other fx deconvolution, denoising compared to the removal of noise is greatly improved.

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