Results from time-lapse seismic data on Ekofisk Field have been successfully used in monitoring reservoir compaction and well planning for more than five years. In the past, the time between repeat surveys was up to 10 years (1989–99), and these surveys observed large time-lapse signals dominated by time shifts attributed to reservoir compaction and overburden subsidence. In addition to continued use of time shifts, joint interpretation of three streamer surveys (1989, 1999, 2003) has demonstrated a useful, though quite noisy, time-lapse amplitude signal at the reservoir level.

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