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Campos Basin
Campos Basin is one of 12 coastal sedimentary basins of Brazil. It spans both on-shore and off-shore parts and is located near Rio de Janeiro. The basin originated in Neocomian stage of the Cretaceous period 145–130 million years ago during the breakup of Gondwana. It has a total area of about 115,000 square kilometers whereas the on-shore portion is small at only 500 square kilometers.〔
==Exploration==
The off-shore oil exploration in the Campos Basin began in 1968.〔 The first exploratory well was drilled in 1971. The first field to be discovered was Garoupa in 1974 at a shallow depth of 120 m followed by Namorado in 1975 in 166 m of water.〔Bacoccoli, G., Morales, R.G., Campos, O.A.J., 1980, The Namorado Oil Field: A Major Oil Discovery in the Campos Basin, Brazil, in Giant Oil and Gas Fields of the Decade: 1968-1978, AAPG Memoir 30, Halbouty, M.T., editor, Tulsa: American Association of Petroleum Geologists, ISBN 0891813063, pp. 329-338〕 The first oil production started in 1977 from Enchova field at the depth of 124 m.〔 The largest fields (discovery year) include Linguado (1978), Carapeba (1982), Vermelho (1982), Marimba (1984),〔Horschutz, P.M.C., Freitas, L.C.S. de, Stank, C.V., Barroso, A. da S., and Cruz, W.M., 1992, The Linguado, Carapeba, Vermelho, and Marimba Giant Oil Fields, Campos Basin, Offshore Brazil, In Giant Oil and Gas Fields of the Decade, 1978-1988, AAPG Memoir 54, Halbouty, M.T., editor, Tulsa: American Association of Petroleum Geologists, ISBN 0891813330〕 Albacora (1984), Marlim (1985), Albacora-Leste (1986), Marlim Sul (1987), Marlim Leste (1987), Barracuda (1989), Caratinga (1989), Espadarte (1994), Roncador (1996), Jubarte (2002) and Cachalote (2002). The largest Marlim field is located northeast of the Basin, 110 km offshore in water 650 to 1050 m deep.
By 2003 41 oil and gas fields had discovered, which lie at the distances 50 to 140 km from the cost and at water depths varying from 80 to 2,400 m. Of these fields 37 are being developed by Petrobras. By 2003 the oil production from the basin had reached 1.21 million barrels per day. The production comes from a variety of reservoirs including siliciclastic turbidites, fractured basalts, coquinas, calcarenites (limestones). The total cumulative production from the Campos Basin by 2003 was 3.9 billion barrels of oil with remaining reserves of 8.5 billion barrels.
In February 2010 a new 65 million barrel discovery was made by Petrobras near the Barracuda oil field.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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