Petrobras confirms third oil discovery at the mouth of the Amazon Petrobras has identified a third oil reservoir in the Morpho well, in the Foz do Amazonas basin. The drilling and collection of geological data have been completed in the area at a depth of 2,886 meters. According to the president of the government company, Magda Chambriard, the results increase the optimism regarding the oil potential of the equatorial margin. After completion of operations at the site, Petrobras' exploratory probe will proceed to the Potiguer Basin, on the coast of the Rio Grande do Norte.