ABSORPTION COEFFICIENT EXTRACTING METHOD BASED ON DYNAMIC WAVELET ESTIMATION

Wavelet extraction based on convolution-model,we often assume the minimum-phase wavelet.Although phase shift and Q-compensation can be adopted in seismic data processing,the extracted wavelets from real seismic data is mostly mixed-phase.The most common way to extract absorption coefficient is seismic trace spectrum modeling,i.e.using the smoothed amplitude spectrum of the seismic trace to substitute wavelet amplitude spectrum,but this brings in error,also create more uncertainty while interpreting seismic profile properties.To solve this problem,we calculate the amplitude spectrum and phase spectrum of seismic wavelet dynamically in post-stack migration seismic section,and then synthesize wavelet of any phase type.By using dynamic wavelet extract the absorption coefficient profile,the differences of reservoir with and without oil and gas can be finely showed in significant,combining with the analysis of the dynamic absorb coefficient map of No.1 Jia section,which provides a accurate method for detailed interpretation of the reservoir in work area.