地震薄层反射系数谱反演算法研究及应用

阐述了谱反演的从地震记录中去除地震子波进而得到反射系数序列的基本原理及过程,分析了谱反演线性化方法存在的问题,即其所需所有频率成分与地震资料带限的矛盾。提出了线性谱反演约束方法,在假设地震到每个采样点均存在反射系数值的情况下,通过在Cauchy约束条件下反演得到稀疏反射系数,然后挑选出这些稀疏反射系数序列,再在L2模约束条件下反演得到更加精确的解。这里提出的方法在模型数据以及实际数据的应用中取得了较好的效果,说明了该方法的有效性,并且验证了谱反演能够分辨出小于调谐厚度的薄层,提高了地震勘探分辨率的能力。

Thin-bed reflectivity inversion and seismic application

This paper explains the theory and process of reflectivity acquisition by removing the seismic wavelet influence from the seismic records,and analyzes the problems caused by the spectral inversion linearization,that is,the requirement of all of the frequency data components in conflict with the fact that seismic data are band-limited.A restricted linearization method is recommended in this paper.In case of every sample of seismic trace have a value of reflectivity,inverse reflectivity using Cauchy constraints,sort out the sparse reflectivity sequence from the one inversed,and then inverse the reflectivity sequence with L2 norm constraint for more precise solution.This method recommended in this paper has achieved a good effect both in model and actual seismic data application,which indicates its validity and effectively,and show that the spectral inversion has the ability to identify the thin-bed whose thickness below the tunning thickness and enhanced the resolution of seismic explora-tion.