Seismic monitoring of compacting reservoirs is known to be a difficult task and depends critically on the amount of compaction of the reservoir and velocity changes of the rocks as the effective stress changes (Tura et al., 2005; Hatchell and Bourne, 2005). The main question addressed in this study is whether a combination of surveillance methods can be used to help identify and manage the risks that are posed by an unknown degree of compartmentalization in a compacting offshore gas reservoir.

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