一种实现谱模拟反褶积的新途径

A new way to realize spectral modeling deconvolution

与常规反褶积相比,谱模拟反褶积对反射系数序列为非白噪化的情况有更好的适应性,在压缩剩余子波提高分辨率的处理中具有较好的效果。然而该方法也存在局限性:①拟合所用的多项式限制了子波振幅谱的形态;②多项式拟合的求解较复杂,且稳定性差;③未考虑反射系数的颜色特征,反褶积的结果看不到反射系数振幅谱偏蓝的特点。为了弥补这些不足,本文提出一种实现谱模拟反褶积的新途径:①不使用多项式拟合,把地震记录振幅谱作为一个实数序列,并使用滤波器来平滑这个振荡的序列从而提取出子波振幅谱;②考虑反射系数序列的颜色特征,在模拟子波振幅谱之前,先压制反射系数序列颜色的影响。理论实验及实际数据处理结果表明:该方法简单易实现,能够更为准确地估算出子波振幅谱,从而得到更好的反褶积结果。

Compared with the routine deconvolution,the spectral modeling deconvolution has better adaptivity for non-white noise reflection coefficient,with the method the better results can be obtained in the processing in which the residual wavelet was compressed so the resolution was raised.However the method has following limitations:(1)The polynomial used in fitting limits the shape of the wavelet amplitude spectrum;(2)It does not consider the color characteristics of the reflection coefficient,the expected blue characteristic of the reflection coefficient amplitude spectrum was not seen in the deconvolution results.In order to compensate the defects,a new way to realize spectral modeling deconvolution was proposed in this paper:(1)Do not use polynomial fitting,regarding the amplitude spectrum of the seismic records as a real sequence,a filter was used to smooth the sequence so the wavelet amplitude spectrum could be estimated;(2)Considering the color characteristic of the reflection coefficient sequence,before modeling the wavelet amplitude spectrum,the color influence of the reflection coefficient sequence was compressed.The theoretical experiment and processing results for the field datasets show that the method is simple and easy to realize,with the method the wavelet amplitude spectrum can be accurately estimated,better deconvolution results can be obtained.