Abstract: In view of the poor complementation of frequency spectrum notch of OBC dual-sensor data, the differences in ghost and reverberation recorded by hydrophone and geophone have been analyzed from the perspective of receiving wave fields of OBC hydrophone and geophone, and it is recognized that reverberation is the cause of poor complementation of frequency spectrum notch between hydrophone data and geophone data. At the same time, analysis of hydrophone and geophone wavelet contaminated by reverberation at the different sea bottom reflection coefficients shows that when the sea bottom reflection coefficient increases, the hydrophone data frequency spectrum notch gets sharper, while the geophone data frequency spectrum notch gets weaker, therefore, the higher the sea bottom reflection coefficient, the poorer the complementation of frequency spectrum notch between hydrophone data and geophone data of the OBC dual-sensor data. For OBC data with poor complementation of frequency spectrum notch between hydrophone data and geophone data, dual-data combining method selected to attenuate ghost reflection of receiver points should not affect reverberation, the reverberation can be attenuated through deconvolution method after the combination of the hydrophone and geophone data. Simulated data and real data have proved that the processing method above is right.

Key words: ocean bottom cable(OBC), ghost, frequency spectrum notch, reverberation, sea bottom reflection coefficient, dual-data summing