石油物探2017，Vol.56Issue(3)：373-381,9.DOI:10.3969/j.issn.1000-1441.2017.03.007
两种海底多分量波场分离方法的模型测试及改进
The model testing and the improvement strategy for two decomposition methods of seabed multi-component seismic recordings
摘要
Abstract
Many necessary messages about gas reservoir can be obtained from ocean multi-component seismic prospecting,which effectively reduces the multi-solutions of conventional P-wave prospecting and has the advantages of gas-cloud imaging and fluid detecting.As ocean multi-component data is usually recorded by 4C sensors on the ocean bottom cable,abbreviated as 4C-OBC,the down-going P-wave and S-wave will be received as well as up-going P-wave and S-wave.Therefore,wavefield decomposition is the key problem for ocean multi-component seismic exploration.In this paper,SCHALKWIJK and EDME the two common calculation formulae of wavefield decomposition are introduced firstly.Secondly,both methods are tested on a ocean seabed horizontal layered medium model,and the decomposition results of their testing recordings are compared with the theory solutions,which are calculated by applying Helmholtz operator and Poynting vector at every wavefield extrapolation.Finally,the two common wavefield decomposition calculation formulae can`t separate pag-leg reflection of up-going interference wave.The calculation formulae of reflections from up-going PP wave of P-wave is derived based on the waveform, transformation from marine interface not only by separating peg-leg reflection from up-going hydrophone component,but also by separating S-P wave from up-going P-wave component.关键词
波场分离/双检合成/4C-OBC/旋转交错网格/坡印廷矢量Key words
wavefield decomposition/dual-sensor seismic data merging/4C-OBC/rotated staggered-grid/Poynting vector分类
天文与地球科学引用本文复制引用
张建利,刘志斌,张云鹏,李维新,王赟..两种海底多分量波场分离方法的模型测试及改进[J].石油物探,2017,56(3):373-381,9.基金项目
国家杰出青年科学基金项目(41425017)资助.This research is financially supported by the National Science Fund for Distinguished Youth Scholars (Grant No.41425017). （41425017）
