The 2006 3D seismic acquisition in the Cleaverbank High area (Quadrant 49, UK Offshore) has sparked a chain of integrated processing and interpretation projects in 2007 and 2008. The projects were aimed at enabling field development decisions and well-planning in the complex subsurface setting of this area. Initial depth-migrated data and results of a local Rotliegend AVA inversion appeared to be adversely affected by residual multiple energy. Subsequently, advances in in-house pre-processing de-multiple runstreams were tested and benchmarked on synthetic shot data. Implementation of the most promising runstream lead to an improved migrated image, more confident seismic interpretation and the adjustment of a planned well-trajectory. Several (in-house and contractor) depth migration algorithms were utilized to allow better assessment of remaining exploration potential in the area. The migration velocity model had been improved by also incorporating the RMO measured on a vintage 3D survey, that was shot over the same area at a different angle. The impact of slight velocity model perturbations on the migrated image was later assessed in a well-derisking exercise. Parallel deployment and integration of contractor and in-house geophysical capability maximized the value of the newly acquired seismic dataset.
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