典型水深与海底介质条件下的OBC/OBN多分量地震数据波型特征OA北大核心CSTPCD

Multi-component OBC(ocean bottom cable)and OBN(ocean bottom node)surveys are important techniques for off-shore exploration.Seismic waves travelling back and forth between free surface and the sea floor generate complicated wave modes in multi-component seismogram.How to understand the intrinsic mechanisms and influences of various signals and noises is crucial to data processing and interpretation.In view of various potential wave fields in offshore multi-component seismic data,we estab-lish elastic parameter models in accordance with different water depths and properties of typical sea-floor deposits and generate synthetic multi-component OBC/OBN records using the spectral element method.The influences of water depth and sea-floor me-dium properties on the kinematic and dynamic performance of wave fields are investigated in terms of the behavior of different wave modes.Based on the comparative analysis of OBS(ocean bottom seismograph)data acquired from a shallow-water zone in the East China Sea and deep-water zone in the South China Sea,we establish the controlling mechanism of free-surface multiples and sea-floor boundary waves by water depth and sea-floor medium properties,which may be helpful to the development and appli-cation of offshore multi-component data processing techniques.