Brazil’s state-owned oil company Petroleo Brasileiro SA, Petrobras is leading an effort to sell Petrobras Oil and Gas BV, Petrobras Africa.

Why does this deal matter to Nigeria? It is because Petrobras is involved in two Deepwater oil exploration blocks off the coast of Nigeria.

The blocks are Akpo and Agbami producing fields and are operated by Total SA and Chevron Corp respectively.

Petrobas said on Thursday that it is being joined in the sale by shareholders Grupo BTG Pactual SA and Helios Investments.

Heavily indebted Petrobras announced plans this week to sell its 50% stake, and began sending information on the company to potential investors.

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It has been joined in the sale by BTG Pactual E&P BV, a subsidiary of investment bank Grupo BTG Pactual SA, and Helios Investments, who will offer their respective 40% and 10% stakes.

Grupo BTG Pactual tried to sell its stake separately earlier this year. It held talks with a group of Nigerian investors but failed to reach an agreement, a source with knowledge of the matter told Reuters.

BTG Pactual did not immediately comment.

Petrobras, the world’s most indebted oil company and focus of a massive corruption scandal, is seeking to offload $21 billion in assets through 2018 and has moved aggressively to cut debt.

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