在海洋地震勘探中产生的虚反射和一次反射波的波形是一样的,很大程度上会抑制低频分量,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。在已知检波器深度和海水速度的情况下,在F-K域中,先分选至炮域压制检波点虚反射,再分选至检波点域压制炮点虚反射,在叠加剖面上,虚反射得到了明显压制。在虚反射压制后的频谱上,陷波得到了恢复,频带得到了明显拓宽,为后续地震反演提供了高品质的地震资料。
In offshore seismic survey, the waveform of a ghost looks same as the reflected wave. The ghost may heavily suppress the low-frequency components and result in the notching in frequency do- main, and thus reducing the resolution of seismic records and resulting in the event aliasing or false e- vents. In order to improve the quality of seismic data, we put forward in this paper a method as the following. As the depth of seismic receiver and water velocity are known, in the F-K domain, we e- liminate the resource ghost in the receiver domain first, and then eliminate the receiver ghost in the shot-point domain. Afterwards, in the spectrum, the notching is restored and the frequency band is widened, which provides high quality seismic data for the subsequent seismic inversion.