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Research of Multiple Suppression Method Based on Inverse Scattering Theory

Author: ZhangChuanQiang
Tutor: LiZhenChun
School: China University of Petroleum
Course: Earth Exploration and Information Technology
Keywords: Multiple suppression Inverse scattering theory Inverse scattering series Wave Theory The lowest energy law
CLC: P631.4
Type: Master's thesis
Year: 2011
Downloads: 113
Quote: 0
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Abstract

Multiple suppression problem is most prominent seismic issues, along with an increase in the complexity of exploration and exploration accuracy requirements increase, based on the theory of multiple wave signal suppression methods are often unable to meet seismic requirements, and based on wave theory of multiple suppression method takes into account a number of kinematics and dynamics of wave propagation characteristics, and almost without any a priori information can be processed, not only to avoid suppression method based on signal domain some limitations, but can achieve better suppression effect, so it shows some advantages, with good space for development and application prospects. This article first inverse scattering theory and the development of inverse scattering theory to do a brief introduction, followed by several waves on the basics and the common methods of repression were reviewed briefly introduced based on the signal domain and domain-based fluctuations of several commonly used repression principle of the method and implementation process. This paper focuses on the combination of Weglein wave equation and put forward by the inverse scattering series of theoretical calculation method to suppress multiple wave (hereinafter referred to as ISS method), which is based on the wave theory and the Born series, based on the free surface of a structure related sub-sequences to predict and eliminate multiple wave, the method does not need to know the underground velocity structure information for a variety of complex underground conditions in the inverse scattering series method implementation process, wavelet estimation and shortcut wave field The recovery is essential, ISS method can remove the free surface multiples, while retaining significant wave information, the complicated structure also effective. From the introduction of the lowest energy law to adapt to suppress multiple waves, and have achieved good results. In addition to the ISS method to suppress the interlayer multiples do some exploring, principles and formulas to achieve the complete derivation. This method does not rely on speed model, one can predict with all relevant interfaces between layers of the same order multiples. Finally, a simple model, complex models, Sigsbee2B model and the actual data processing, application proves inverse scattering series method to predict and suppress the effectiveness and practicality of multiple waves, while better able to maintain effective wave energy. Multiple suppression methods of geophysical exploration workers require more effort and struggle, I believe that with the increase in difficulty as well as exploration and development of computer technology, the existing wave theory based on multiple suppression technology will gradually tend to improve , and the new theories and methods will follow the birth, the better for seismic data processing services.

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