海上拖缆宽频采集定量化设计方法

The Method of Quantitative Design of Broadband Acquisition for Marine Towed-streamer

海上拖缆采集记录存在因海水面反射引起的鬼波,使得记录频带变窄,需要采用专门去鬼波手段压制鬼波,而震源及拖缆沉放深度直接影响到去鬼波处理的效果,为此,根据鬼波产生的机理给出了震源及拖缆沉放深度原则,基于鬼波滤波算子的平均叠加脉冲响应谱分析优选出适用工区变深度缆最优参数,为海上宽频采集定量化设计提供了依据,实际采集资料去鬼波处理效果验证了海上拖缆宽频采集定量化设计的可靠性。

There exist ghost waves caused by sea surface in marine towing cable collection records, which makes the frequency band narrower, and requires special decontrol means to suppress ghost waves. The effect of deghost processing is affected by the seismic source and the depth of cable sinking. Therefore, the principles of source and cable sinking depth are given in this paper based on the mechanism of ghost wave generation. The optimal pa- rameters of the variable--depth streamer （VDS） in the work area are determined by the a- nalysis of average stack spectra for pulse response of ghost filter operator, which provides the foundation of quantitative design for the marine broadband acquisition. The processing effect of deghost for marine actual VDS seismic data verifies the reliability of the quantita- tive design of the broadband acquisition for marine towed--streamer.