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P670 4D on Legacy Data - The Tern Field Abstract The Tern Field has been covered by two 'legacy' 3D datasets in 1983 and 1995. The field has also been re-shot in 2000. The legacy data acquisition was designed independently and with structural objectives only. As an experiment it was decided to attempt a time-lapse study using this data and a minimum of reprocessing of the original seismic data. This is both for time and also cost savings and to estimate the real potential for realization of the value invested in legacy 3D data in the North Sea. The field