Faced with the world’s most important oil discovery in years, the Brazilian government is seeking to step back from more than a decade of close cooperation with foreign oil companies and more directly control the extraction itself.

The move is part of a nationalistic drive to increase the country’s benefits from its natural resources and cement its position as a global power. But it could significantly slow the development of the oil fields at a time when the world is looking for new sources, energy and risk analysts said.

This month, Brazil’s government said it wanted the national oil company, Petrobras, to control all future development of the deep-sea fields discovered in 2007, which international geologists estimate could hold tens of billions of barrels of recoverable oil.

The change would make Petrobras the operator for the 62 percent of the new area that has yet to be bid out, consigning foreign companies to the role of financial investors. That would limit their ability to help set the pace for the oil fields’ development, while giving Petrobras significantly more power to generate jobs and award lucrative contracts.

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