SAO PAULO (Reuters) - Brazilian state-run oil company Petrobras said on Monday that Chinese energy group CNODC Brasil Petróleo e Gás Ltda did not express an interest in buying an additional 5% stake in production rights in the Buzios oilfield.

The move comes after CNOOC Petroleum Brasil Ltda (CNOOC), another Chinese oil firm, decided to exercise its option to buy a 5% stake in the venture for $2.1 billion.

Buzios, which is located in the Santos Basin pre-salt area, is the largest deepwater oilfield in the world.

Given both CNOOC and CNODC decisions, Petrobras said it will hold an 85% stake in Buzios after closing the deal with CNOOC, which will own 10%. CNODC will maintain its 5% stake.

The production sharing contract was signed in 2019, when Petroleo Brasileiro SA - as Petrobras is formally known - bought 90% of the transfer of rights surplus in the Buzios field.

Each Chinese company acquired a 5% stake at the time and had the option to increase its shares by another 5%.

Buzios is one of the largest oil-producing fields in Brazil, second only to Tupi. According to oil regulator ANP's data, it pumped an average of 569,648 barrels per day in July.

(Reporting by Gabriel Araujo; Editing by Kirsten Donovan and Steve Orlofsky)