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Over the Northern North Sea the hydrocarbons trapping mechanism in the pre-BCU interval is mostly structural and relies on favourable lithology juxtaposition across faults and to a lesser extent on fault seal properties. Refining the quality of depth migrated data to improve focusing and reduce multiple content, is critical to the proper assessment of prospects risks and volumetrics and thus economics. Over a block operated by Total E&P UK (100%), improved risks evaluation of a fault trap prospect was achieved through the use of Controlled Beam Migration (CBM), a specialized form of the beam algorithm. Controlled Beam migration is suited for structural imaging. It improves the signal to noise ratio and enhances steep dips. It is also possible to achieve some discrimination between primary and multiple energy during the imaging process. Over Balvenie, the CBM dataset has improved imaging of the faults and clarity of data for interpretation, thanks to a significant reduction in multiple content and better focusing of dipping events.

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