Brazil’s Margem Equatorial Could Rival Pre-Salt, Says BNDES Chief
Aloizio Mercadante, president of Brazil’s national development bank BNDES, said geological studies and continental-shelf mapping indicate that the Margem Equatorial — Brazil’s offshore oil frontier along the northern Atlantic coast — has potential “very similar to pre-salt,” the prolific deepwater play that transformed Brazil into a major global oil producer. The comments, made in an interview with Band’s Canal Livre, mark the highest-level Brazilian government endorsement of the Margem Equatorial’s strategic significance.
“It is only possible to confirm a reserve when the drill bit hits the oil,” Mercadante said, emphasising that geological promise must still be validated through exploratory drilling. “It makes complete sense to prospect, to discover whether we have it, how much we have, and then see what is the best mechanism for production.” On timing, he noted that drilling operations are ongoing and costly — “each well represents a few million dollars” — and provided no firm production timeline.
The Margem Equatorial spans approximately 560,000 square kilometres along the Brazilian coast between Amapá and Rio Grande do Norte. It comprises five offshore basins: Foz do Amazonas, Pará-Maranhão, Ceará, Barreirinhas, and Potiguar.
Brazil’s Empresa de Pesquisa Energética (EPE) estimates the Foz do Amazonas basin alone may hold approximately 5.7 billion barrels of oil — which would increase Brazil’s proven reserves by 34 percent and Petrobras’s own reserves by 58 percent.
Industry estimates run higher. Adriano Pires, founder of the Brazilian Infrastructure Centre (CBIE), projects the Margem Equatorial could hold 7.5 to 10 billion barrels of recoverable oil and produce approximately 1 million barrels per day by 2029-2030 — meaningful additions to Brazil’s current 3.5 million barrels daily production. Pires noted the regional geology is “very similar to Guyana,” whose offshore discoveries by ExxonMobil have transformed that country into a major producer since 2015.
Key Points
The Geology
| Indicator | Margem Equatorial |
|---|---|
| Geographic Extent | ~560,000 km² (Amapá → Rio Grande do Norte) |
| Five Basins | Foz do Amazonas, Pará-Maranhão, Ceará, Barreirinhas, Potiguar |
| EPE Estimate (Foz do Amazonas) | ~5.7 billion barrels (+34% Brazilian reserves) |
| CBIE Estimate (region) | 7.5-10 billion barrels recoverable |
| Petrobras Capex 2025-2029 | ~$3 billion (R$15.2 billion) — 15 wells |
| First Well “Morpho” | ~5 months to initial results (after Oct 2025 start) |
| Production Projection (CBIE) | ~1 million barrels/day by 2029-2030 |
| Geological Parallel | Guyana (ExxonMobil, since 2015) |
Why It Matters
Mercadante’s pre-salt comparison is the most significant Brazilian government endorsement of the Margem Equatorial to date. The pre-salt — the deep-offshore oil layer beneath salt formations in the Santos and Campos basins — transformed Brazil from a marginal producer in the 2000s to a top-ten global oil producer today, with current daily output around 3.5 million barrels. If the Margem Equatorial geological promise translates to discoveries, Brazil could enter a second productive era.
The Guyana parallel is the strongest reference point. ExxonMobil’s 2015 Liza discovery in the Stabroek block off Guyana — within the same geological province extending southward into Brazilian waters — has grown to over 11 billion barrels of estimated recoverable oil. As the Rio Times reported on Petrobras’s strategic positioning, Guyana now produces approximately 650,000 barrels per day, becoming the world’s fastest-growing oil producer.
Petrobras is the sole operator after a five-year impasse. The Foz do Amazonas block FZA-M-059 was acquired in 2013 with Total and BP as consortium partners. Both foreign operators exited amid environmental-licensing difficulties, leaving Petrobras as sole operator. The Margem Equatorial sits alongside the Arã pre-salt expansion as the most significant exploration commitments in Petrobras’s 2026-2030 Strategic Plan.
Ibama, Brazil’s environmental regulator, finally approved Petrobras to drill in the Foz do Amazonas block on October 20, 2025 — ending the five-year licensing dispute. Mercadante directly addressed the environmental criticism in his interview: “We must combat denialism in all areas, and it is with scientific argument that you can rebut it.” He stressed there has never been a Petrobras accident in oil prospecting and that modern exploration technology has multiple prevention and containment mechanisms.
BNDES is co-financing — alongside the Brazilian Navy — a continental-shelf mapping programme that has been generating the geological data underpinning the optimistic assessments. As the Rio Times reported on the R$37 billion ($7.32 billion) São Paulo Petrobras commitment, the Margem Equatorial sits alongside major pre-salt expansion in the company’s strategic-plan capex.
The political timing is significant: with Brazil hosting COP30 in Belém in November 2025, the Lula government’s simultaneous expansion of oil exploration and climate diplomacy has drawn international scrutiny. The first well “Morpho” is expected to produce initial results within five months — making 2026 a critical year for the Margem Equatorial thesis.
5.7B-10B barrels potential. +34% Brazilian reserves possible from Foz alone.
Guyana proves geology works. ExxonMobil 11B barrels in same province.
Petrobras sole operator. Full value capture if discoveries materialise.
“Drill bit hits oil” Mercadante warns. Reserves unconfirmed until tested.
Total + BP exited. Foreign majors thought licensing risk outweighed reward.
Climate-transition risk. 2030+ new oil into structural-demand uncertainty.
Frequently Asked Questions
What is the Margem Equatorial?
The Margem Equatorial (Brazilian Equatorial Margin) is an offshore oil-exploration frontier extending approximately 560,000 square kilometres along Brazil’s northern Atlantic coast between Amapá and Rio Grande do Norte states. It comprises five offshore basins: Foz do Amazonas, Pará-Maranhão, Ceará, Barreirinhas, and Potiguar. The region’s geological structure is similar to neighbouring Guyana, where ExxonMobil has discovered over 11 billion barrels of oil since 2015.
How much oil could the Margem Equatorial hold?
Estimates vary. Brazil’s Empresa de Pesquisa Energética (EPE) estimates approximately 5.7 billion barrels in the Foz do Amazonas basin alone — which would increase Brazilian proven reserves by 34% and Petrobras’s own reserves by 58%. The Brazilian Infrastructure Centre (CBIE) projects 7.5 to 10 billion barrels recoverable across the broader region, with production potentially reaching 1 million barrels per day by 2029-2030. These projections await confirmation through Petrobras‘s planned 15 exploratory wells.
Who is Aloizio Mercadante?
Aloizio Mercadante is president of the Brazilian Development Bank (BNDES), one of Brazil’s most powerful economic institutions. Appointed by President Lula in January 2023, Mercadante is an economist, former senator (PT-SP), former Minister of Science and Technology (2011-2012), former Minister of Education (2012-2014), and former Chief of Staff (2014-2016). His public endorsement of the Margem Equatorial’s pre-salt potential represents the highest-level government signal of strategic commitment to the offshore exploration programme.
Updated: 2026-05-17T18:00:00-03:00 by Rio Times Editorial Desk
Margem Equatorial pre-salt | Aloizio Mercadante BNDES | Petrobras Foz do Amazonas | Guyana ExxonMobil parallel | 5.7-10 billion barrels | The Rio Times
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