Committee Narrows Mexico's Shale Options to Two Basins

Mexico's scientific committee on unconventional gas recommended halting any shale development in the Tampico-Misantla basin on social, biodiversity and population-density grounds, allowing further study only in Burgos and Sabinas-Burro-Picachos and only where deep saline water reservoirs can be confirmed. The panel set conditions including a ban on fresh water use, minimum 75% recycling, proof of hydraulic isolation from drinking-water aquifers, community consultation and independent monitoring of aquifers and seismic activity. The exclusion removes roughly 97% of Mexico's prospective shale oil but only about 15% of its unconventional gas, prioritising import substitution for PEMEX and prospective energy investors.

Mexico's scientific committee on unconventional gas delivered its first verdict, and it comes with a hard precondition: shale development may only be studied further in Burgos and Sabinas-Burro-Picachos, and only if deep saline reservoirs can be proven to supply the water.

Presenting at Palacio Nacional, the Comité Científico sobre Soberanía Energética y Yacimientos de Gas Natural no Convencional recommended excluding the Tampico-Misantla basin outright, citing social protection, biodiversity and population density. Ana Gómora, Researcher, UNAM Faculty of Engineering, said the exclusion followed a combined reading of environmental, social, technical and biodiversity variables rather than any single disqualifying factor.

The arithmetic explains why the government could accept it. Of an estimated 141.5Tcf of unconventional natural gas, the committee placed 67Tcf (47.3%) in Sabinas-Burro-Picachos, spanning Coahuila and Nuevo León, and 53.8Tcf (38%) in Burgos, in northeastern Tamaulipas. Tampico-Misantla holds 20.7Tcf, or 14.6%. Ruling it out removes around 60% of the country's total unconventional resource potential once oil is counted, but only about 15% of the gas.

The Oil Mexico Just Set Aside

That distinction is the whole policy. PEMEX's 2025-2035 Strategic Plan attributes some 34.8 billion barrels of prospective crude to Tampico-Misantla, roughly 97% of Mexico's shale oil. The committee's recommendation effectively parks that resource in order to protect a gas strategy, which shiws where the administration's priority sits: import substitution, not barrels.

The dependency is the reason. As MBN reported when the committee was announced in April, Mexico consumes 9Bcf/d of natural gas and PEMEX produces just 2.3Bcf/d, leaving 6.8Bcf/d imported, around 75% of demand, overwhelmingly from Texas. PEMEX's strategy targets more than 4Bcf/d of domestic gas production by 2030, a near-doubling that conventional fields alone are unlikely to deliver. Committee members reportedly said as much: raising conventional extraction helps, but will not meaningfully displace US supply.

A Water Test Before a Gas Test

The conditions attached to the two surviving basins are stringent enough to function as a second filter.

José Hernández, Director, UNAM Faculty of Engineering, put per-well water requirements at 50,000-70,000m³ and recommended prohibiting the use of fresh water destined for human consumption, agriculture or livestock. In its place, operators would draw exclusively on saline water from deep formations, which means drilling wells for purely hydrogeological purposes before any production well is contemplated.

Those formations would have to be shown scientifically to be hydraulically isolated from the aquifers supplying local populations. The committee added a minimum 75% water recycling requirement, permanent monitoring of surface and groundwater quality before, during and after any project, free and informed public consultation with communities in the area of influence, and an independent scientific monitoring system covering aquifer integrity, environmental impact and seismic activity.

President Claudia Sheinbaum confirmed that research wells to verify saline water are the immediate next step, stressing that they are not intended to extract gas but to establish the availability, volume and characteristics of deep water. Her framing was unambiguous: absent saline water, she said, the possibility of any unconventional exploitation closes. She committed to adopting the recommendations as the guide for policy, said no extraction process would begin without addressing the experts' conclusions, and announced a digital platform publishing the committee's studies alongside periodic meetings with the 54 specialists.

Cost, Governance and the Gap to Eagle Ford

The saline-water mandate lands on an operator already short of capital. MBN has previously reported estimates that water treatment systems for this kind of approach would require US$5-10 million in initial capital and US$3-6 per barrel in operating costs, a meaningful burden for a heavily indebted PEMEX. Add a hydrogeological drilling campaign of unknown length before the first shale well, and the timeline stretches well past the "modest" 2026-2028 contribution PEMEX pencilled into its own plan.

The non-technical obstacles are equally live. Coahuila sits with the opposition; Tamaulipas carries security risks tied to organized crime. AMEXHI has already conditioned its endorsement of the shale push on long-term regulatory certainty, competitive frameworks and physical security in producing zones. Civil society groups, meanwhile, have been pressing Sheinbaum to honour her campaign pledge to ban hydraulic fracturing, and the consultation requirement gives them a formal venue.

Scale is the last reality check. PEMEX has drilled 25 exploratory wells across the three basins to date. Eagle Ford, immediately across the border, and the source of most Mexican imports, produced 4.3Bcf/d in June alone, roughly equivalent to PEMEX's entire national gas output. Closing that gap requires hundreds of wells, continuous operations and sustained reinvestment against steep decline curves.