The oil slick in the Campos Basin is about 163 square kilometers . Chevron said an assessment well was the source of the spill . Brazil 's Oil and Gas Regulator ( ANP ) said Chevron reported a seepage in its offshore Frade project November 8 and said that between 200 and 330 barrels of oil per day leaked into the ocean . A spokesman for Chevron, which owns a majority stake in Petrobras, declined to comment on whether it had been notified by authorities that there were any spills from its offshore drilling operations.
The oil slick in the Campos Basin is about 163 square kilometers . Chevron said an assessment well was the source of the spill . A spokesman for Chevron, which owns a majority stake in Petrobras, declined to comment on whether it had been notified by authorities that there were any spills from its offshore drilling operations.