pgs4dUnderstanding new details in the 4D seismic snal uncovered by a broadband time-lapse dataset at Gullfaks Main Field in the North Sea. The Gullfaks area is in Block 3410Understanding new details in the 4D seismic snal uncovered by a broadband time-lapse dataset at Gullfaks Main Field in the North Sea. The Gullfaks area is in Block 3410