宽频地震处理技术在南海某工区的应用

在海洋地震勘探中产生的鬼波会抑制低频分量,造成频域的陷波点,降低地震记录的分辨率,使地震记录的同相轴发生混叠甚至产生假的同相轴。笔者采用FK域水平电缆压制鬼波法,将地震数据进行FK变换,对维纳滤波求取反褶积算子投影到FK域,并对二者进行褶积,将结果 FK反变换回时间域。鬼波压制后的模型数据频带得到了有效拓宽,低频、高频信息均得到了加强。鬼波压制后的实际数据目的层频带从12~60 Hz拓宽到8~75 Hz,三亚组能量与合成记录匹配较原始数据更好。

Application of broad frequency seismic processing technique in one block of South China Sea

In the process of marine seismic exploration，the ghost wave will depress low frequency part，lead to trap wave point in frequency domain，reduce the resolution of seismic record，and cause to overlap in which would event and even fake events existed． The seismic data FK transforming have been taken using FK domain ho- rizon cable depression ghost wave method． The method calculates deconvolution operator for Wiener filtering and projects in FK domain，then convolutes them，and the result finally transforms to time domain． The band of model data after deghosting is widened， and the low and high frequency data are enhanced． The frequency band of seismic data is widened from 12 ～60 Hz to 8 ～75 Hz by deghosting． The amplitude matching is better between seismic data and synthetic seismogram at Sanya Formation after deghosting．