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Research of Multiple Suppression Method Based on Wave Theory

Author: LiuJianHui
Tutor: LiZhenChun
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Multiple suppression Wave Theory SRME Extended pseudo multi-channel Filter masks
CLC: P631.4
Type: Master's thesis
Year: 2010
Downloads: 123
Quote: 2
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Abstract


Multiple suppression problem has always been a very important subject in the seismic data processing multiple suppression method based on signal theory, as the the exploration complexity increases and exploration accuracy requirements increase, often unable to meet the requirements of the seismic exploration considering multiple suppression method based on the wave theory of several kinematic and dynamic characteristics of wave propagation, and almost does not require any a priori information can be processed, not only to avoid some of the limitations of the signal domain suppression method based and able to achieve better suppression effect, so shows certain advantages, with good space for development and application prospects. Firstly a review of the multiples of the basics as well as repression, a brief signal domain and several commonly used to suppress fluctuations in domain-based method principle and implementation process. This paper focuses on the Berkhout proposed the SRME suppress multiple wave method, derived according to the the WRW model and Berkhout data of matrix the seismogram and freedom interface multiple the forward formulas, then derive the the iterative inversion formula to suppress the free surface multiples the CFP technology, on this basis, combined with the iterative inversion formula derived multiples repression layer, layer multiple wave of repression Preliminary. For Berkhout proposed the SRME iterative method based on least squares matching multiple defects, focuses on the expansion of pseudo multi-channel matching multiple methods and their improvement strategies, can more accurately predict multiples multiples to actual match, so are able to achieve a good match in the amplitude, time and phase, so as to achieve better suppression effect, multiple suppression method based on independent component also discussed. The basis of the above two major research extended pseudo multi-channel matching method is added to the SRME the iterative prediction suppress multiple wave processes, the final process of this article suppress multiples. Finally, by a simple model, complex model, Sigsbee2B model, as well as the actual data processing proved SRME with extended pseudo multi-channel matching combination carried the iterative prediction suppress multiples effectiveness and practicality, the basic two to three iterations multiple repression can be achieved, at the same time be able to better maintain effective wave energy. Multiple suppression method requires more geophysical exploration efforts and struggle of the workers, and I believe that with the exploration and increase in difficulty as well as the development of computer technology, the existing based on the wave theory of multiple wave suppression technique will gradually tend to improve new theories and methods will follow the birth, better services for seismic data processing.

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