LONDON (Reuters) - The world's three largest oil traders are competing to buy the African arm of Brazil's Petrobras PETR4.SA that owns stakes in two major Nigerian offshore oil blocks, industry and banking sources with knowledge of the matter said, after submitting bids earlier this month.

FILE PHOTO: The logo of Brazil's state-run oil company Petrobras is pictured in the company headquarters in Sao Paulo, Brazil February 20, 2018. REUTERS/Paulo Whitaker

Last November, state-controlled Petroleo Brasileiro SA, known as Petrobras, launched the sale of 100 percent of Petrobras Oil & Gas BV, or Petrobras Africa, as part of the heavily-indebted company’s plan to offload $21 billion in assets through 2018 as it also faces a massive corruption scandal.

Petrobras holds half the shares in the company while 40 percent are held by a subsidiary of Grupo BTG Pactual SA and 10 percent by Helios Investment Partners.

Bankers have previously estimated the value of the Petrobras venture to be about $2 billion.

The venture has stakes in two offshore blocks that contain two producing fields, the major Agbami field in OML 127, operated by a local Chevron CVX.N affiliate and the Akpo field in OML 130 operated by Total SA TOTF.PA.

The sale has attracted the top trading firms which are always on the hunt for long-term crude supplies. Mercuria and BP BP.L had also its potential.

In early May, three consortiums including the major trading companies submitted bids to buy Petrobras Africa.

Vitol bid together with the oil upstream subsidiary of U.S. private equity firm Warburg Pincus called Delonex and Canadian-listed Africa Oil AOI.TO, an oil and gas exploration firm that is part of Sweden's Lundin Group LUPE.ST.

Glencore GLEN.L joined with Nigerian listed firm Seplat SEPLAT.LG and French firm Maurel & Prom MAUP.PA that is majority-owned by the Indonesian government. Indonesia's state oil firm Pertamina also backs Maurel & Prom and owns a 20 percent stake in Seplat.

The third bidder was privately-held Famfa Oil together with Royal Dutch Shell RDSa.L.

Famfa Oil is one of the concessionaires in the operator of the Agbami oil field along with Chevron, Statoil and Petrobras. Chevron holds the majority stake.

Vitol, Glencore, Shell, Africa Oil declined to comment. Maurel, Famfa and Seplat did not respond for requests for comment.

Petrobras is expected to make a decision by the end of May. But the sources said that this could slide as there was a still a possibility that the bids might be split between the two oil block stakes.

Agbami produces about 240,000 barrels per day (bpd) while the Akpo field in OML 130 produces nearly 130,000 bpd with a second field Egina due to come onstream in the same block later this year.

(This version of the story Corrects to Africa Oil from Africa Energy, paragraphs 8 and 12.)