PGS shoots 4C 3D survey in deep water off Brazil

Petroleum Geo-Services ASA (PGS), Oslo, completed a four-component (4C) 3D seismic survey of a 45 sq km area of giant Roncador oil field in as much as 1,860 m of water off Brazil.This is industry’s first ultradeepwater 4C survey, and the water depth is triple that of previous 3D surveys in the Campos basin, said PGS, which shot the survey for Petroleo Brasileiro SA (Petrobras). Processing will be finished in September.The three-boat survey used ocean-bottom cables 6 km long deployed from the Bergen Surveyor seismic vessel and steered into position with a real-time acoustic navigation system.The crew steered the 4C sensors landed within 0.8% of the water depth of their planned positi...

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