利用VSP提高叠后地面地震资料分辨率

Improving the resolution of poststack surface seismic data by VSP

反褶积是地面地震处理中提高成像分辨率的常用方法。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,地面地震得到的叠后剖面中深层频率偏低,处理中难以提取真实反映地震波在地下各个深度传播的地震子波,不能得到精确的反褶积算子。我们从VSP资料中提取反褶积算子用于叠后地面地震资料处理,使地震剖面的分辨率明显提高,同相轴的连续性得到改善,波阻特征有所加强,整体质量得到较大改进。

The deconvolution is a common technique in improving resolution of surface seismic data. In view of the fact that seismic data are hard to exactly reflect seismic wavelet traveled from strata of various depths and to get precise deconvolution operator due to serious disturbance in surface receiver and greater decay and absorption. The deconvolution operator is extracted from VSP log received in ＇different depths in borehole and applied it to the deconvolution processing of post-stack seismic data. The results demonstrated that this technique can be used to greatly improve the resolution of poststacked profile, the continuity of event, the characteristics of wave impedance and the quality ofpoststack processed profile.