干涉波场重建衰减OBC层间多次波

由于OBC(ocean bottom cable)数据的采集方式为接收电缆铺设在海底,炮点在海面,常规的层间多次波压制方法不再适用,这给实际数据的处理带来了巨大的困难。本文利用地震波场干涉重建方法,对采集到的OBC数据进行波场重建,得到炮点和检波点都位于海底的虚拟炮集记录,与常规的在地表激发、地表接收的炮集一样,把OBC数据的层间多次波转化成常规的表面相关多次波和层间多次波,再进行预测。将其结果与共聚焦点(CFP)边界算法去除层间多次波的结果进行了对比,体现干涉重建技术在OBC数据层间多次波预测方面的准确性。

Interferometry wave-field reconstruction method in internal multiples elimination of OBC data

The conventional internal multiples elimination method can not be applied in the OBC data because receivers are at the bottom while the sources are at the surface of the sea，which makes the practical marine seismic data processing face with great challenge． In this paper，we get the virtual shot records with the virtual source and receivers at the bottom of the sea by reconstructing the OBC data，using seismic interferometry． The results are the same as conventional seismic data with the source and receivers at surface，which can convert the internal multiples of the OBC data to conventional surface-related multiples and internal multiples． Comparing with the results of CFP method，we can conclude that the seismic interferometry wave-filed reconstruction method can be applied well in in- ternal multiples elimination of OBC data．