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Research on a Method of Information Feedback Controlling Seismic Wavelet Estimation Based on Deconvolution

Author: PengXing
Tutor: DaiYongShou
School: China University of Petroleum
Course: Information and Communication Engineering
Keywords: Seismic wavelet Deconvolution Synthetic seismogram Key attributes Feedback
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 152
Quote: 0
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Abstract


Seismic wavelet estimation quality directly affects the resolution, high signal to noise ratio, high-fidelity seismic data processing results. For real seismic data processing, seismic wavelet extraction accuracy can not judge, wavelet extraction method can not measure the performance of the merits of the problem, a deconvolution based on information feedback control wavelet extraction approach. One of the deconvolution methods for in-depth analysis, the first hypothesis based on sparse mixed-phase deconvolution method to obtain the reflection coefficient series, and parametric modeling approach extracted wavelet convolution obtain synthetic seismograms, and then through seismic attribute analysis and optimization access to key property, the use of synthetic seismograms and the original seismic records of the key attribute comparison results to determine the accuracy and extracted wavelet wavelet extraction technology effectiveness, and finally use the results corrected wavelet, get high-precision seismic waves. Obtained by the deconvolution of the reflection coefficient sequence directly affects the accuracy of the resulting synthetic seismogram accuracy. Through the classical deconvolution and improve existing methods of deconvolution, deconvolution method for a variety of assumptions and scope of application of different reflection coefficients resulting sequence of extraction accuracy is not high, the use of a mixture based on sparse assumption phase wavelet deconvolution method, the reflection coefficient sequence solving problem into optimization problem, by establishing objective function and iteratively solving optimal reflection coefficient sequence. With the classical least squares deconvolution methods, theoretical analysis and simulation results show that the data in the sub-way mixed-phase when the strike wave reflection coefficient series high accuracy, and wavelet convolution synthetic seismogram obtained after very similar to the original seismic records. Based on feedback seismic wavelet extraction Another key issue is the feedback information and feedback mechanisms OK. Seismic attributes for the complexity and cross-cutting characteristics, seismic attribute analysis and optimization methods are reflected seismic characteristics of key attributes (waveform, delay, frequency, bandwidth), determine the feedback information. By analyzing the synthetic seismograms process in all aspects of key attributes for seismic effects, the establishment of feedback mechanisms, depending on the difference in the key attributes of wavelet extraction method to determine the direction of improvement, to improve the accuracy of the purpose of sub-waves. Deconvolution in ensuring the reflection coefficient sequences extracted high precision seismic attribute analysis and optimization through the feedback information is accurate under the premise of using the proposed method for linear (cumulant matrix method) and nonlinear (cumulative amount proposed legal) parametric model combining wavelet extraction method validation and sub-wave correction. Theoretical analysis and simulation results show that the experimental data in the original sub-waves are known, the use of modified wavelet synthesis of new seismic record and a second wavelet extraction, the secondary sub-waves are compared with the original wavelet, verifiable sub- wave extraction method is effective, indirect validated deconvolution to improve the resolution of seismic record features; unknown in the original sub-waves through the synthetic seismograms with the key attributes of the original seismogram comparison method can effectively guide the improvement of wavelet extraction method to improve the accuracy of sub-waves.

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