海底电缆交叉鬼波化双检合并技术改进及应用

An improvement of the dual-sensor summation technique for cross-ghosting from OBC and its application

双检合并技术在海底电缆地震资料处理中被广泛应用,可衰减电缆鬼波的影响。传统方式以水、陆检记录的波场记录相同为假设,电缆鬼波压制效果差,合并效果并不理想。在分析交叉鬼波化双检合并技术基本原理的基础上,综合利用水检资料与陆检鬼波褶积的结果和陆检资料与水检鬼波褶积的结果求取刻度算子,同时在地震资料处理中利用陆检资料标定水检资料,从而优化了交叉鬼波化双检合并技术。实际资料处理结果表明,改进后的技术可有效衰减电缆鬼波,分离出上行波场,大幅度拓宽地震资料频带,提高地震资料分辨率,从而提供更丰富的构造细节信息。

The dual-sensor summation technique is widely used in processing seismic data from ocean bottom ca- bles （OBC）, because it can attenuate the ghosting impact. In the conventional approaches, however, there is an assumption that the geophone and hydrophone are equal in seismic record, which has led to poor attenuation of ghosting and not ideal effect of dual-sensor summation. Based on analyzing the fundamentals of the dual- sensor summation technique for cross-ghosting, the convolution results between the hydrophone data and the geophone ghost and between the geophone data and the hydrophone ghost were simultaneously used to acquire a calibration factor, and the geophone data was used to calibrate the hydrophone data when processing seismic data, by which the dual-sensor summation technique for cross-ghosting from OBC can be optimized. According to the results from processing actual seismic data, the improved technique can effectively attenuate the ghosting impact, separate the up-going wave, greatly widen the frequency band, improve the seismic resolution and provide more abundant information of structural details.