Petrobras has discovered oil in an exploratory well at the Marlim Sul field, located in the pre-salt layer of the Campos Basin, off the coast of Rio de Janeiro.

According to a statement released by the company to investors on Thursday (Mar. 26), the oil is classified as “excellent quality.”

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Well 3-BRSA-1397-RJS is located 113 kilometers off the coast of Campos dos Goytacazes, at a water depth of 1,178 meters.

The company reported that the oil-bearing interval was confirmed using electrical logs, gas indications, and fluid samples.

The samples will subsequently be sent for laboratory analysis, which will allow the characterization of the reservoir and fluid conditions, enabling continued assessment of the area’s potential, the statement said.

The company explains that exploration - a step prior to production - in the pre-salt layer aims to replenish oil reserves in mature areas, ensuring the company’s sustainability and meeting national energy demand during this period of energy diversification.

The Marlim Sul field was discovered in November 1987, and Petrobras is its sole operator.

In addition to Marlim Sul, the Campos Basin’s oil fields include Marlim and Marlim Leste.

The Campos Basin is the second-largest producer of pre-salt oil, accounting for 7 percent of the total. The leading basin is Santos, also on the Southeast coast, with 78 percent.