CAMPOS BASIN AREAS UPDATENot including pre-salt and exploratory prospects

Rio de Janeiro | May 2012 |

CAMPOS BASINWaimea / Pipeline and Vesuvio Complexes Waikiki Complex

Source: Area estimates based exclusively on OGXs studies

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CAMPOS BASIN

Waimea Complex Not including pre-salt and exploratory prospectsWaimea ComplexTUBARO AZUL FIELD (1st MODULE) OGX-3 OGX-21D/OGX-26HP OGX-50D/OGX-55HP OGX-53D/OGX-60HP OGX-65D/OGX-68HP FUJI OGX-8 OGX-56D OGX-69 Albian: 43m Aptian: 44m Albian: 60m Albian: 38m ILLIMANI OGX-52 OGX-58DP OGX-75 OGX-81 Albian: 80m Aptian/Barrem: 50m Albian: 14m Santonian: 1.7m Albian: 52m Albian: 71m Albian: 97m TAMBORA Santonian: 5m Albian: 96m Albian: 49m In progress OGX-33 OGX-31 OGX-73 OSORNO Albian: 48m Aptian: 23m Albian: 37m

CHIMBORAZO Albian: 42m

OGX-28DOGX-43D OGX-61

Albian: 24mAlbian: 50m Albian: 9m TUPUNGATO WELL UNDER EVALUATION

OGX-54

Albian: 24m

OGX-20

Maastrich: 9m & 3m Albian: 50m Aptian: 42m

Source: Area estimates based exclusively on OGXs studies

Note: 1 Figures in meters illustrate net pays of oil columns

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CAMPOS BASIN

Waikiki Complex Not including pre-salt and exploratory prospectsWaikiki ComplexTUBARO MARTELO FIELD OGX-25 OGX-35D OGX-41D/OGX-44HP Eocene: 8m (gas) Albo-Cenomanian: 145m Albo-Cenomanian: 80m Albian: 92m WELLS UNDER EVALUATION OGX-45D OGX-29/32 Maastric: 5m Oil Shows

PER OGX-14 OGX-76 Albian: 35m & 27m Albian: 6m ING OGX-18A OGX-62 OGX-64DP OGX-67 OGX-71 Santonian: Oil shows Albian: 12m (oil column) Albo-Cenomanian: 20m Santonian: 26m Santonian: 23m ITACOATIARA OGX-79 Albian: 64m

Source: Area estimates based exclusively on OGXs studies

Notes: 1 Figures in meters illustrate net pays of oil columns 2 OGX-76 well has proven the Ing accumulation extension with discovery on Santonian age reservoir

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CAMPOS BASIN

Pipeline Complex Not including pre-salt and exploratory prospectsPipeline ComplexPIPELINE OGX-2A Eocene: Oil shows Cretac: Shows Albian: 100m Aptian: 50m Barremian: 15m Albian: 60m Albian: 107m MRK-3 CARAMBOLA A (PIPELINE) Santonian: 14m Albian: 43m Aptian: 12m CARAMBOLA MRK-5 RJS-105 Albian: 17m Albian: 150m

OGX-36D/OGX-39HP OGX-40D

OGX-42DOGX-48 OGX-70 OGX-72

Eocene: 6m Albian: 82mAlbian: 12m Albian: 129m

OGX-80

Albian: 51mETNA (PIPELINE)

OGX-6

Albian: 74m Aptian: 17m SANTA HELENA (PIPELINE)

OGX-15

Albian: 32m Aptian: 31m

Source: Area estimates based exclusively on OGXs studies

Notes: 1 Figures in meters illustrate net pays of oil columns 2 RJS-15 well drilled by Petrobras

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CAMPOS BASIN

Vesuvio Complex Not including pre-salt and exploratory prospectsVesuvio ComplexVESUVIO OGX-1 OGX-9D OGX-13 Eocene: 57m Eocene: 60m Eocene: 10m KRAKATOA OGX-5 Maastrich: Oil Shows Albian: 30m Aptian: 20m KILAWEA OGX-4 Eocene: 17m POTOSI (VESUVIO) OGX-37 Oil Shows

Source: Area estimates based exclusively on OGXs studies

Note: 1 Figures in meters illustrate net pays of oil columns

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