Petrobras has completed what it describes as the largest seismic survey in the world, in the Onerous Cession area of Búzios field, Santos basin, about 200 km offshore Rio de Janeiro. The project, named 3D Búzios Nodes began in November 2018 and used ocean bottom nodes (OBM) technology, setting receivers in the bottom of the ocean in 6,600 positions across 1,620 sq km at depths of 1,600-2,200 m.
The work was done by a partnership Compagine Générale de Géophysique (CGG) and Seabed Geosolutions, using a Manta-model seismic receiver. This model is capable of registering data continuously for 75 days in up to 3.000 m of water.
OBN receivers registered seismic reflections generated by acoustic waves transmitted by a source boat. Processing of the acquired data is now underway.
Petrobras won rights to Búzios, which began production in April 2018, in a Nov. 6 mega-auction of production sharing contracts in the Brazilian presalt. It will operate the field with a 90% stake in a consortium with CNODC Brasil Petroleo e Gas Ltda. (5%) and CNOOC Petroleum Brasil Ltda (5%). Buzios produces 600,000 boe/d through four platforms, with a fifth scheduled to start second-half 2022.