【摘要】 对地层的吸收衰减估计所面临的一个重要问题是估计的分辨率较低。利用叠后地震反射资料,在尽可能短的时窗内有效地估计衰减是一个具有挑战性的课题。基于Margrave提出的地震记录的非平稳褶积模型,本文提出将时频滤波算子作用于反褶积后的地震记录,得到衰减作用后的反射系数,再行估计吸收衰减,可有效地提高衰减估计的分辨率。该方法不同于目前已知的估计方法,理论上能在小于子波波长的时窗内进行吸收衰减估计。更多还原

【Abstract】 For seismic attenuation estimation,a key point is to improve the estimation resolution.It is a challenge to estimate attenuation as accurately as possible within a time-window as short as possible.Margrave(1998) proposed a nonstationary-convolution model for a time varying seismic record,which might be an effective way for attenuation estimation.In this paper,a method for seismic attenuation estimation is proposed.First operators of time frequency filtering are applied to a deconvolved seismic trace to obtain a reflectivity after attenuation.Then the attenuation estimation based on the reflectivity is performed.Completely different from the other methods,this method can obtain an attenuation estimation within a short time-window.This window can be shorter than the length of the time-window than the wavelength of the wavelet.更多还原