Research on improved cross-correlation seismic interferometry method based on marine vertical cable seismic data

Seismic interferometry can obtain a new record by correlating original response received at two different stations. In the record, one station acts as the virtual source, while the other is regarded as the receiver. However, conventional cross-correlation interferometry calculations may yield inaccurate imaging results for virtual source records due to non-stationary phase region influences from the source. To solve this problem, we propose a new calculation method. In this method, for the traditional correlation result, the virtual event is selected through a time window and the correlation coefficients are calculated with the real data. Finally, by selecting the appropriate coefficient range, the source that needs to participate in the superposition calculation is determined. To verify the accuracy of this method, it is combined with conventional interferometry to process both the marine vertical cable seismic (VCS) model and actual data. By comparison, the profile obtained by the improved method are more accurate.