Seismic interferometric migration and data-referenced-only migration
地震相干偏移与数据自参照偏移的关系

Seismic interferometric migration and data-referenced-only migration are recently developed seismic migration methods that have found some new applications in seismic exploration. Especially in some VSP (Vertical Seismic Profiling) imaging applications, they have partially solved some problems that are very difficult to solve by using conventional surface seismic data. While the interferometric migration method migrates cross-correlated seismic data, the data-referenced-only migration method has no such apparent procedure. It extrapolates different parts of the recorded seismic wavefields and these extrapolated wavefields are referred to each other during imaging. Both methods have the merits that the original seismic source position, triggering time, and near-source properties can all be ignored for imaging. We analyze these two methods, and relate them to the same seismic migration theory. We also compare their results on a synthetic VSP multiples migration experiment, and discuss some of the practical issues of using these two methods.