利用VSP提高叠后地面地震资料分辨率

Improvement of Resolution for Post-stack Ground Seismic Data with VSP

反褶积是地面地震处理中提高成像分辨率的常用方法。地面地震资料因地面接收干扰严重,高频成分在中深层衰减和吸收作用较大,得到的叠后剖面中深层频率偏低,难以提取真实反映地震波在地下各个深度地层传播的地震子波,不能得到精确的反褶积算子。利用VSP测井在井下不同深度地层接收的特征,从VSP资料中提取该反褶积算子用于叠后地面地震资料反褶积处理,使地震剖面的分辨率明显提高,同时同相轴的连续性得到改善,波阻特征有所加强,叠后处理剖面整体质量得到较大的改进。

Deconvolution is a method in common use in dealing with improvement of image resolution in ground seism. In view of the fact that seismic data are hard to exactly reflect seismic wavelet traveled from strata at various depths and to get precise deconvolution operator due to serious disturbance in surface receiver and greater decay and absorption. By adopting VSP logging, picking-up the operator from it and applied the deconvolution operator into the deconvolution processing of post-stack seismic data, it can remarkably improve the resolution of post- stacked profile, continuity of event and intensify wave impedance, and finally improve the quality of post-stack processed profile.