Why does Brazil want to join Opec?

What is it about oil that makes Brazilian officials so talkative? Last month, the country’s oil regulator provoked uproar when he claimed, very speculatively, that the recently discovered Carioca field might hold a massive 33 billion barrels of recoverable oil reserves. Now, Luiz Inacio Lula da Silva, Brazil’s president, speaking to Der Spiegel, says he wants his country to join Opec.