The Brazilian Equatorial Margin is considered one of the main new frontiers. offshore accounts The area is an area of oil and gas exploration in the country. It is of interest to the energy sector due to its high estimated reserve potential and geological similarities to neighboring countries that have already made significant discoveries. But where is it located?
What is the Equatorial Margin and where is it located?
The Equatorial Margin is an extensive maritime strip located on the North and Northeast coast of Brazil, stretching from the state of Amapá to Rio Grande do Norte, along more than 2.200 kilometers of the Brazilian coast. It represents a new exploratory frontier of oil and gas, formed by five large sedimentary basins: Foz do Amazonas, Pará-Maranhão, Barreirinhas, Ceará and Potiguar.
These basins are mostly located in deep and ultra-deep waters, with water depths that can exceed 3 meters, requiring advanced technology for drilling and reservoir evaluation. Although part of the region has already been explored in the past, technological advances and the availability of new seismic data have rekindled the interest of oil companies.
From a geological point of view, the Equatorial Margin presents similarities with producing areas of Guyana and Suriname, where large oil reserves have been discovered in recent years. These regions share the same geological system, formed during the separation of the South American and African continents, which increases expectations that similar structures are also present on the Brazilian side.
Studies by the National Agency of Petroleum, Natural Gas and Biofuels (ANP) indicate that the total oil and gas potential of the Equatorial Margin could reach approximately 30 billion barrels of oil equivalent. This volume places the region among the most promising exploratory provinces in the world and reinforces its strategic role for Brazil's energy future.
Who is exploring the Equatorial Margin?
Petrobras is one of the main players in this movement. In its 2025–2029 business plan, the state-owned company foresees total investments of US$7,9 billion in exploration, of which US$3 billion, around 38%, will be allocated to the Equatorial Margin. In total, the company plans to drill 514 exploratory wells during this period, 15 of them in the Equatorial Margin, equivalent to almost a third of the wells planned for the five-year period.
Exxon Mobil and Chevron also have exploration rights in the region.
The first basins to be explored will be the Amazon River Mouth and the Pará-Maranhão basin, with the start scheduled for 2026. The first exploratory well will be located more than 160 kilometers from the nearest point on the coast and about 500 kilometers from the mouth of the Amazon River. Drilling should take place in a water depth of approximately 2.880 meters, which characterizes a deep-water operation.
In 2025, Petrobras obtained a license to drill the North Uatumã exploratory well in block FZA-M-059. According to the state-owned company, the well is located approximately 175 kilometers off the coast of Amapá and approximately 500 kilometers from the mouth of the Amazon River. The operation will be carried out with a drilling rig positioned in the area and is estimated to last five months.
Despite the progress, the company clarified that there will be no commercial oil exploration at this stage. Now, the objective is to gather geological data that will allow for an assessment of the region's true oil and gas potential. "There is no oil production at this stage," Petrobras emphasized in an official statement last year.
Why is the Equatorial Margin important?
According to studies by the Brazilian Infrastructure Center (CBIE), exploration of the Equatorial Margin could add up to 1,106 million barrels of oil per day to national production starting in 2029. This volume would represent about a third of Brazil's current production and would be crucial to offset the expected natural decline of pre-salt production from 2030 onwards, currently the country's main production frontier.
The interest of oil companies in the Equatorial Margin is linked to the need to replenish reserves that will, in the future, replace part of the pre-salt production. The recent exploratory success in Guyana, in an area with a similar geological formation, reinforces the potential of the Brazilian region.
When was the Equatorial Margin discovered?
Although it is now called the "new pre-salt," this extensive stretch of the country's northern coast began to attract the interest of the oil industry in the second half of the 20th century.
The first exploratory drilling on the Equatorial Margin took place in the 1970s, at a time when Brazil was expanding its efforts to reduce its dependence on imported oil. At the time, however, the results were considered unpromising. The discoveries did not indicate sufficient volumes to justify commercial production, and the region ended up taking a back seat in the following decades.
Although the Equatorial Margin has been identified as an area of interest for over 50 years, its "discovery," in the economic and strategic sense, is still ongoing. Unlike the pre-salt layer, whose viability was quickly proven, the region depends on new drilling to confirm whether the estimated potential translates into commercially exploitable reserves.
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