
An aerial view shows oil that seeped from a well operated by Chevron at Frade, on the waters in Campos Basin in Rio de Janeiro state November 18, 2011.
The decision on Wednesday came as the head of Chevron's Brazilian unit testified before Brazil's Congress, where he apologized for the November 8 spill that leaked about 2,400 barrels of oil into the ocean off the coast of Rio de Janeiro.
Brazil's National Petroleum Agency said it decided to halt Chevron's drilling rights after determining there was evidence that the company had been "negligent" in its study of data needed to drill and in contingency planning for abandoning the well in the event of accident.
The agency, known as ANP, also rejected a request from Chevron made before the leak to drill wells in the deeper subsalt areas in the Frade field where the spill occurred. The field is located in the oil-rich Campos Basin and is the only block in Brazil where Chevron produces oil as the operator.












