pgs4dSubsurface Monitoring Requires Strict Desn Thresholds. 4D seismic monitoring of reservoir depletion, often assisted by enhanced recovery processes, relies upon the acquisitionFirst Break March 2025 | Opportunistic 4D Using a Regional Non-Repeated 4D Monitor, an Ærfugl Case Study This case study from the Ærfugl field in the Norwegian Sea, shows that MultiClient