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Vector-acoustic Reverse-time Migration of Volve OBC Dataset without Up/Down Decomposed Wavefields

机译:VOORMONS-MACOUSTIC volve OBC数据集的反向时间迁移,无需上/向下分解波场

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Wavefield separation based on the combination of pressure and particle velocity data is generally used to extract the up- and down-going components from multi-component seabed or towed marine seismic recordings prior to imaging. By carefully combining vector-acoustic (VA) data in the extrapolation of shot gathers in reverse-time migration (RTM) we show that wavefield separation (deghosting) can be performed 'on-the-fly' at no extra cost. We call such a strategy VARTM and we successfully apply it to a North Sea OBC field dataset, acquired in the Volve field. We also discuss additional advantages of VARTM over standard RTM of up-going only waves such as improved handling of directivity information contained in the acquired vector-acoustic data for clearer shallow sections and imaging of the down-going component of the recorded field (mirror VARTM) without the need for an additional finite difference modelling.
机译:基于压力和粒子速度数据的组合的波场分离通常用于在成像之前从多组分海底或牵引海上地震记录中提取上下组件。通过在反向时间迁移(RTM)中仔细组合射击射击的推断中的向量 - 声学(VA)数据,我们显示了波场分离(Deghosting)可以在没有额外的成本下进行“在线”。我们称之为这样的策略Vartm,我们成功将其应用于北海OBC现场数据集,在volve字段中获取。我们还讨论了vartm上的额外的r rm上的额外优点,这些r rm onv-over的波浪,例如改进了所获取的向量 - 声学数据中所包含的可指向性信息,以便更清晰的浅部分和记录的字段的下降组件的成像(镜子vartm )无需额外的有限差异建模。

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