pgs4dINDUSTRY INSHTS September 18 By Andrew Long (Andrew.Long@) 1 of 8 A Clearer Image │ 4D Inshts from SEG 2018 In this paper I review most of theSubsurface Monitoring Requires Strict Desn Thresholds. 4D seismic monitoring of reservoir depletion, often assisted by enhanced recovery processes, relies upon the acquisition