What Is the Permian Basin and Why Does It Matter?

Last updated: October 21, 2026

The Permian Basin is a roughly 86,000-square-mile sedimentary basin in West Texas and southeastern New Mexico that is the single largest source of crude oil in the United States. In 2026 it produces about 6.8–7.0 million barrels of oil per day — nearly half of all U.S. crude output — along with roughly 29 Bcf/d of natural gas, most of it associated gas released alongside oil drilling (EIA Short-Term Energy Outlook, 2026).

Where Is the Permian Basin?

The Permian Basin stretches across a swath of West Texas and southeastern New Mexico, centered on the city of Midland, Texas. It takes its name from the Permian geological period (roughly 299–252 million years ago), when thick layers of marine sediment were deposited in the ancient sea that once covered the region.

Geologically, the Permian Basin is really two major sub-basins separated by a structural high called the Central Basin Platform:

The Spraberry (Midland) and Bone Spring (Delaware) formations are roughly time-correlative but differ in composition, while both sub-basins share stacked Wolfcamp shale intervals that are considered broadly analogous (Enverus; EIA technically oriented basin reports). This vertical stacking of multiple productive zones — several formations on top of one another in the same acreage — is the geological reason the Permian has become the most intensively drilled oil region in the world.

Discovery and Early Development

Commercial-scale Permian drilling began in February 1920 with a well drilled by William H. Abrams in Mitchell County, Texas, in an area geologists had previously written off as a “petroleum graveyard.” The basin’s defining discovery came three years later: the Santa Rita No. 1 well in Reagan County, drilled on University of Texas land, struck oil in May 1923 after nearly two years of drilling. Its name refers to the patron saint of the impossible, after investors reportedly scattered rose petals on the site during a long dry spell. Santa Rita No. 1 produced for almost seven decades before being capped in 1990, and its success triggered a wave of exploration across the wider basin (American Oil & Gas Historical Society; Dallas Fed).

Conventional vertical drilling drove decades of growth, and Permian output peaked at nearly 2 million barrels per day in the early 1970s before declining for the rest of the 20th century as easy-to-reach oil was depleted.

The Shale Revolution and Today’s Production

The modern Permian boom dates to the 2010s, when operators combined horizontal drilling with multi-stage hydraulic fracturing (see: What Is Fracking?) to unlock the stacked Wolfcamp, Spraberry and Bone Spring shale intervals that vertical wells could not economically produce. Output surpassed its 1970s peak around 2017 and has continued climbing since.

Most Permian natural gas is associated gas — a byproduct of oil-directed drilling rather than the primary target — so its output tracks crude prices and drilling activity rather than gas demand alone. With WTI averaging roughly $84/bbl through much of 2026 (versus about $65/bbl in 2025), operators have kept oil-directed drilling active even as gas takeaway infrastructure has had to expand to keep pace (see What Is WTI Crude Oil?).

Who Operates in the Permian?

Consolidation has reshaped the operator landscape. ExxonMobil’s 2024 acquisition of Pioneer Natural Resources made it the basin’s clear leader; Pioneer no longer exists as an independent operator.

Figures above are largely company-wide production (not all Permian-only), since several of these operators run assets in multiple basins; treat them as a guide to scale rather than exact basin-attributed output. Other major Permian producers include EOG Resources and Chevron, both of which have historically ranked among the basin’s largest operators.

Infrastructure: Moving Permian Oil and Gas to Market

Because the Permian is landlocked, its growth has always depended on pipeline capacity to reach refining and export hubs on the Gulf Coast (Corpus Christi, Houston) and the Louisiana LNG corridor. Gas takeaway has repeatedly lagged behind drilling activity, periodically forcing operators to flare or curtail gas; new pipeline capacity has been the industry’s recurring response.

Industry trackers (RBN Energy) estimate up to roughly 11 Bcf/d of additional Permian natural gas takeaway capacity is scheduled to enter service through 2029, which would materially change the basin’s gas-flow economics even if oil remains the primary driver of drilling decisions.

Why the Permian Basin Matters

• It is the main engine of U.S. oil growth. The EIA expects U.S. crude output to reach a record 13.8 million b/d in 2026, with most of the first-half gain coming from the Permian and the federal Gulf of Mexico.
• It gives the U.S. outsized influence on global oil balances. Permian supply growth is one of the key swing factors OPEC+ weighs when setting production policy (see What Is OPEC?), because it can offset voluntary OPEC+ cuts.
• It is reshaping U.S. gas markets too. As associated gas output climbs alongside oil drilling, new Permian pipeline capacity is becoming a significant source of feedgas for Gulf Coast LNG export terminals.
• Its economics are now driven by scale players. Post-consolidation, a handful of major operators — chiefly ExxonMobil — account for a large and growing share of basin output, concentrating decision-making that used to be spread across dozens of independent producers.

Current Status

As of late 2026, the Permian remains in a growth phase, though a more moderate one than during the 2015–2019 shale boom. Oil output is rising on the back of higher WTI prices (averaging around $84/bbl through much of 2026 versus roughly $65/bbl in 2025) and breakevens of roughly $63–69/bbl across the Midland and Delaware sub-basins, according to the Dallas Fed’s March 2026 energy survey. Associated natural gas output is climbing in step, and a wave of new pipeline capacity — Gulf Coast Express’s expansion, Hugh Brinson, Blackcomb and Matterhorn’s expansion — is entering service through 2026–2027 to keep gas flowing out of the basin.

FAQ

What is the Permian Basin?
The Permian Basin is a large sedimentary basin in West Texas and southeastern New Mexico that is the largest oil-producing region in the United States, supplying roughly half of national crude output in 2026.

Where is the Permian Basin located?
It spans West Texas and southeastern New Mexico, centered near Midland, Texas, and is divided into the Midland Basin in the east and the Delaware Basin in the west, separated by the Central Basin Platform.

How much oil does the Permian Basin produce?
The EIA forecasts Permian crude output at roughly 6.8 million barrels per day in 2026, around 3% above 2025 levels, making it the single largest source of U.S. oil production.

Who are the biggest operators in the Permian Basin?
ExxonMobil became the basin’s largest operator after acquiring Pioneer Natural Resources in 2024. ConocoPhillips, Occidental Petroleum, Diamondback Energy, Devon Energy, EOG Resources, Chevron and Coterra Energy are also major Permian producers.

Why is the Permian Basin important to global oil markets?
Because it drives most of the recent growth in U.S. crude supply, the Permian influences global oil balances and factors into OPEC+ production decisions, since rising U.S. output can offset OPEC+ supply cuts.

Related The Daily Energy Pages

• What Is Fracking (Hydraulic Fracturing)?
• What Is WTI Crude Oil?
• What Is Natural Gas?
• US Energy Profile
• What Is OPEC?
• What Is Brent Crude?

Sources

• U.S. Energy Information Administration, Short-Term Energy Outlook, August and September 2026
• U.S. Energy Information Administration, Permian Basin play maps and Wolfcamp/Bone Spring geology reports
• Federal Reserve Bank of Dallas, Energy Survey, March 2026
• Enverus, 2025 top U.S. E&P operators ranking
• East Daley Analytics, Permian Basin production outlook, 2026
• RBN Energy, Permian natural gas takeaway capacity analysis, 2026
• American Oil & Gas Historical Society; Dallas Fed — Santa Rita No. 1 history
• U.S. Geological Survey — Delaware Basin description

Illustrative image. Photo: Quintin Soloviev, CC BY 4.0, via Wikimedia Commons — source