基于平面波编码的水体相关多次波压制方法研究

水体相关多次波压制是海洋地震资料处理的重要环节之一。在模型驱动类多次波预测模型的基础上,利用水体一次反射格林函数与自由表面接收到的观测波场褶积,预测高一阶的多次波,并将此多次波预测过程用编码理论来表示,建立起水体相关多次波的预测理论,给出了基于平面波编码的水体相关多次波预测模型。根据斯奈尔定律,利用局部平面波域水体一次反射格林函数形成编码算子,实现了多次波贡献道集的自动优化,提高了水体相关多次波的预测精度,进而改善了多次波的压制效果。理论数据测试和实际数据应用结果证明了本文方法的可行性和有效性。

 Water-layer related multiple suppression is an important step in marine seismic data processing.Based on the model-driven multiple prediction model,the convolution on the Green’s function of water-layer primary reflections with the observed wavefield received in free surface is utilized to predict the higher one-order multiple.Moreover,the multiple prediction process is expressed by coding theory,to build the prediction theory of water-layer related multiple and eventually the plane-wave coding-based prediction model of water-layer related multiple.According to the Snell’s law,the Green’s function of wave-body primary reflections in local plane-wave domain is utilized to generate coding operator,to realize the automatic optimization of multiple contribution gathers,improve the prediction accuracy of water-layer related multiple,and finally enhance the suppression result of multiple.Theoretical data testing and real data application prove the feasibility and effectiveness of the method.

国家重点基础研究发展计划(973计划)项目(2011CB201002)和国家科技重大专项(2011ZX05005-005-008HZ)联合资助。