VSP优化预测反褶积与VSP子波替换法反褶积

VSP optimized predictive deconvolution and VSP wavelet switchover deconvolution

相对于地面地震资料而言,VSP资料具有高分辨率和高信噪比等特点。利用从VSP资料中提取的反褶积算子,对叠后地面地震资料进行处理,可以提高其分辨率。本文提出两种改善地面地震资料分辨率的途径:其一是在常规预测反褶积原理基础上通过设计一个理想的预测步长,使得反褶积后的剖面在信噪比不降低的情况下,获得尽可能高的分辨率;其二是利用VSP高分辨率子波改善地面地震资料的子波。实际资料处理结果表明,两种方法均可以明显提高地面地震剖面的分辨率。

Compared with surface seismic data,VSP data has higher resolution and signal-to-noise ratio(S/N ratio).If deconvolution operator extracted from VSP data is used in post-stack seismic data processing,then the resolution of surface seismic data can be raised.In this paper two methods to improve the surface seismic data resolution are introduced.The first one is based on the regular predictive deconvolution principle by designing an ideal predictive window to make the post-stack seismic section's S/N ratio not decreased,and then trying to reach the resolution as high as possible.The second one is to use high resolution VSP wavelet to replace surface seismic wavelet used in the surface seismic data processing.The real seismic data processing results show that the two methods work well and the surface seismic resolution can be seen obviously raised.