松辽盆地高密度采集地震数据的面波压制方法

Suppressing method of the ground roll for the high-density acquired seismic data in Songliao Basin

松辽盆地高密度采集地震资料的面波具有能量强、频带宽、个数多、线性规律明显的特点,有效压制面波是高密度采集地震资料处理的难点。依据近地表结构,并与常规采集对比,分析了高密度采集地震资料的面波特征;给出十字排列域FKK滤波压制线性规律的面波,再用区域异常处理压制残留面波的技术策略。经详细试验对比,确定了在FKK滤波中面波最小倾角和高截频率的选择原则。在研究区,面波最小倾角应在15ms/道左右,高截频率可以在18Hz左右,摈弃常规采集资料处理中选择面波主频(10Hz左右)作为高截频率的做法。高密度采集地震资料技术实际应用取得了有效压制面波的满意效果。

The ground rolls of the seismic data high-density acquired in Songliao Basin are characterized by strong energy, wide frequency band, multiple events and fine linear law. It is difficult to effectively suppress the ground rolls for the seismic data processing. Based on the near surface structure, and compared with the conventional acquisition, the ground roll characteristics of the seismic data stated above were analyzed;the ground rolls were presented for the cross spread domain with the help of FKK filtering for suppressing the linear law, and moreover the residual ground roll was impressed by zone abnormal processing technique. By means of the detailed experimental comparisons, the selecting principles were determined for the minimum dip and high-cut frequency of the ground roll in the FKK filter. In the study area, the dip stated above should be about15 ms/trace, the high-cut frequency can be18 Hz or so, the method of selecting the main frequency (about10 Hz) of the ground roll as the high-cut frequency was eliminated in the conventional acquired data process. The application of the high-density acquired data processing technique has achieved the satisfactory effects of effectively suppressing the ground roll.