The Application Of Spectrum Whitening Of Seismic Data Based On HHT And "Three Instantaneous" Attribute Extraction

HHT(Hilbert-Huang Transform) is a way of time-frequency analysis methods, which can deal with nonlinear and the non-stationary signal.It is adaptive, fundamentally solves some existing problems based on Fourier analysis, and intrinsic mode function component obtained through decomposition also has specific physical meaning.According to its characteristics we put it into use in seismic data processing.The main work of the dissertation includes:(1)This paper introduces several conventional non-stationary signal time-frequency methods,then expounds the principle of HHT and some existing problems.According to the endpoint effect in algorithm, the algorithm is improved purposefully.(2)Based on the shortage of traditional spectrum methods in improving seismic resolution, a spectrum whitening method based on HHT is proposed.Theoretical model data is tested and the result shows the method is effective and practical.It will be applied to practical seismic data.(3)Using HHT in time-frequency analysis of seismic data,which produces the Hilbert spectrum that depicts more subtle to the morphological characteristics of the seismic signal.Finally extracting seismic attribute profile by using HHT method,which can get instantaneous frequency, instantaneous amplitude and instantaneous phase profile of imf component that compared with original"three instant"profile.In this paper the studies result show that the endpoint effect is effectively suppressed after the algorithm is purposefully improved.HHT is applied to the actual seismic data,which can effectively improve seismic vertical resolution in thin bed or thin interlayer bed identification and tiny structural detection aspect.Through comparing with the profile,the instantaneous frequency profiles of IMF1 component is helpful for better explaining the underground structure.HHT has better time-frequency analysis ability. It shows the superiority in improving seismic resolution and extracting three instantaneous seismic attribute.The prospect of HHT in seismic data processing and interpretation field is great,it is worth further discussing and researching.