Mexico Targets Cantarell With Petrobras Technology

President Claudia Sheinbaum announced that Mexico will explore the deepwater layers of the iconic but severely depleted Cantarell field in alliance with Brazil's Petrobras. The initiative relies on a non-binding, two-year memorandum of understanding (MoU) signed between PEMEX and Petrobras on June 23, 2026, which lacks any immediate investment commitments but opens the door to extensive technology transfers. Once the backbone of Mexico’s energy sector boasting peak outputs above 3MMb/d, Cantarell's production has crashed by over 94% to approximately 112Mb/d. By utilizing Petrobras’s world-renowned subsalt seismic imaging and ultra-deepwater extraction capabilities, the multi-stage project seeks to determine whether untapped Jurassic-era reservoirs exist underneath the heavily exploited Cretaceous strata, all to support the administration's sovereign target of maintaining a steady national production rate of 1.8MMb/d.

President Claudia Sheinbaum announced at her July 6 morning press conference that Mexico plans to intensify oil exploration at Cantarell using deepwater techniques developed by Brazil's Petrobras.

The two-year MoU between PEMEX and Petrobras, signed on June 23, contemplates collaboration in exploration, revitalization of mature fields, refining, petrochemicals, and fertilizers. The Cantarell deepwater study is among the most commercially significant elements of that cooperation framework — and according to the LinkedIn post that circulated the news via Global Energy Mexico, the agreement has not yet defined any investment commitment.

The Scale of Cantarell's Decline

Although Cantarell continues active, its period of highest production is behind it and it is currently considered a mature field. The federal government therefore seeks to evaluate new techniques that would allow it to identify opportunities to maintain the field as a relevant zone for national production.

Sheinbaum explained that the project will develop in stages, beginning with specialized exploration. Only if results confirm the existence of reserves with commercial potential will it advance toward well drilling, meaning the process will be carried out under technical and economic viability criteria.

What Petrobras Brings and What Mexico Specifically Needs

The strategic alliance will leverage the technological leadership of the Brazilian public-private firm in deepwater to evaluate the viability of new commercial reserves below the emblematic complex in the Sonda de Campeche. The project poses an important geological challenge: determining whether the lower structures of Cantarell hold independent petroleum systems or extensions of the already-exploited reservoirs, which will require advanced seismic campaigns and drilling of boundary wells at great depths.

Gonzalo Monroy, Director, GMEC, told El Cronista that while Petrobras is a world leader in ultra-deepwater exploration, the project is unlikely to prosper at Cantarell specifically. The specialist noted significant petroleum potential in the Cuenca Salina, located within the Southeastern Basins off the coasts of Veracruz and Tabasco. "Petrobras's competitive advantage, where it is a global leader, is seismic interpretation — especially for seeing below salt layers — and there are many resources that could exist below the salt," he said.

Monroy's distinction is operationally significant. Petrobras's pre-salt experience in Brazil, the geological analog that makes it Mexico's natural technical partner, was built in the Santos and Campos Basins, where explorers had to penetrate through thick salt layers to find enormous reservoirs below. Mexico's Cuenca Salina presents a structurally similar opportunity, while Cantarell's geology is different: a Cretaceous-era carbonate reservoir that has been extensively produced, where the exploration hypothesis concerns whether deeper Jurassic formations exist below those already exploited strata.

Carlos Slim had made the same geological intuition at the UMAI engineering forum on July 1, stating that a UNAM specialist friend believes that below the exploited Cretaceous formation, more oil may exist in the Jurassic layer, and asking why no one had drilled to look. Sheinbaum's Petrobras announcement a week earlier is the institutional expression of the same hypothesis.

The Production Target

Sheinbaum stated that the government's goal is to maintain a constant production of 1.8MMb/d, destined entirely to the refineries operated by PEMEX. Exploration of deeper zones at Cantarell, incorporating Petrobras methods, would allow the identification of new reserves in zones that until now had remained beyond the reach of traditional technology, according to the president. Operational and regulatory plans for the new exploration phase are expected to begin toward the end of 2026.