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在常规逆时偏移处理流程中,将包含一次波和多次波的地震记录代替脉冲震源子渡沿时间延拓到各个深度层,将地表多次波记录代替一次波地震记录沿时间逆时延拓到相同深度层,然后选取合适的成像条件实现基于逆时偏移的多次波成像,即为多次渡逆时偏移.本文首先详细分析了常规逆时偏移对多次波的成像机制,简要阐述了多次波逆时偏移的原理,在此基础上对多次波逆时偏移和常规逆时偏移的成像效果进行了模型试算,证实了逆时偏移对多次波进行成像的可行性,只有正向外推的震源渡场和逆时外推的预测多次波波场中成对的波场能量才能互相关产生真正的成像值,且多次波逆时偏移可以获取比常规逆时偏移更为广阔的成像和照明范围,对深部构造有更好的照明.
In the conventional reverse-time migration process, the seismic record containing the primary and multiple waves is extended to each depth layer instead of the pulse source sub-pulse along time, and the surface multiple records instead of the primary seismic record along the time reverse Extend to the same depth, and then select the appropriate imaging conditions to achieve multiple imaging based on inverse time migration, that is, multiple cross-time migration.In this paper, a detailed analysis of conventional inverse time migration of multiple Imaging mechanism, a brief account of the principle of multi-wave inverse time migration, based on which the model trial calculation of multi-wave inverse time-migration and conventional reverse-time migration is carried out. It is proved that the inverse time-migration The feasibility of multi-wave imaging, only the forward extrapolation of the source of the cross-field extrapolation and inverse extrapolation of the predicted multi-wave field in pairs of wavefield energy can be cross-correlated to produce a real imaging value, and multiple Inverse time migration can obtain a broader range of imaging and illumination than conventional reverse-time migration, with better illumination of the deep structures.