The Smackover field in south Arkansas is the field that made Arkansas an oil state. The discovery well — the J. T. Murphy, drilled by Oil Operators Trust — came in on April 14, 1922 at 2,024 feet, and within a year almost a thousand wells in the district had produced some twenty-five million barrels. The town of Smackover incorporated in 1923 to cope with the influx. A century later the oil is a stripper business, but the deep brine beneath the field has become the base of the American bromine industry and the focus of a lithium rush.
El Dorado had come in the year before, and by the spring of 1922 south Arkansas was already full of leasing men when the Murphy well found oil at 2,024 feet on April 14. The Smackover strike was bigger. Close to a thousand wells were drilled within twelve months, producing roughly twenty-five million barrels, and the district briefly ranked among the most important in the country. Union County went from pine and farmland to a landscape of derricks, and the mineral reservations executed in those months are the origin of much of the fractional ownership in the county today.
Two different rocks carry the Smackover name, and owners should keep them straight. The 1922 boom came from shallow Upper Cretaceous sands — Nacatoch, Meakin, Blossom and Graves among them — at around two thousand feet. The Smackover Formation itself is a much deeper Jurassic oolitic limestone, named for the same town but a separate exploration target found later, and it is the Smackover Formation that carries the brine now being produced for bromine and lithium. A tract can be productive in one and not the other.
The oil business in south Arkansas declined through the middle of the century and had contracted badly by the 1960s, taking jobs and population with it. What replaced it was chemistry. Brine from the Jurassic Smackover Formation is the only commercial source of bromine in the United States, and plants in Union and Columbia counties have run on it for decades. Since 2024 a federal and state assessment of lithium in the same formation, and exploration drilling that followed, have made south Arkansas one of the most closely watched brine districts in the country.
The 1922 field produces from shallow Upper Cretaceous sands at roughly two thousand feet on the south Arkansas shelf. Beneath them, far deeper, lies the Jurassic Smackover Formation — an oolitic and silty limestone laid down on an ancient sea floor that extends beneath Arkansas, Louisiana, Texas, Mississippi, Alabama and Florida. The Smackover is both an oil and gas reservoir in its own right and the host of the region’s mineral-rich brine. Two stacked, geologically unrelated resource systems therefore sit under the same Union County surface tract.
Oil recovery at Smackover has been primary and waterflood, and the remaining oil business is a stripper business. The far more consequential fluid program in this district today is brine production: wells produce Smackover brine, chemical plants strip the bromine, and the spent brine is reinjected. Lithium extraction proposals use the same basic loop with a direct-extraction step added. This is not enhanced oil recovery — it is a separate industry sharing the subsurface, with its own regulatory framework in Arkansas, and confusing the two leads owners to badly wrong conclusions about what their interest is worth.
South Arkansas owners are getting two kinds of mail right now: offers for old oil royalties and approaches about brine or lithium rights. They are not the same asset, and whether your instrument conveys or reserves brine is a question of the specific wording and of Arkansas law, not something to assume. Anyone who quotes you one lump number for everything under your tract has skipped the hard part. We read the instruments first, separate oil and gas from brine, and we buy minerals and royalties in Union and Ouachita counties and provide free written offers.
County-level well data, production charts, and selling guides for the counties this field spans:
Not automatically, and this is the most important question to get right before signing anything. Brine and the bromine and lithium dissolved in it are frequently treated as a separate legal question from oil and gas in Arkansas, handled under their own leases and the state’s brine regulatory framework. Whether your specific instrument conveys, reserves or is silent on brine depends on its exact wording. That is a title question for a qualified Arkansas attorney, and we recommend owners resolve it before negotiating either asset.
Because the Jurassic Smackover Formation brine is unusually lithium-rich. A 2024 federal and state assessment estimated the formation may hold on the order of five to nineteen million tons of lithium, and 2025 exploration wells in Lafayette County reported average concentrations around 582 milligrams per liter in upper Smackover brines. The same brine has been the only commercial source of bromine in the United States for decades.
No. The 1922 field produced from shallow Upper Cretaceous sands — Nacatoch, Meakin and others — at about two thousand feet. The Smackover Formation is a much deeper Jurassic limestone that shares the town’s name and is the source of the brine. A tract can be productive in one and barren in the other, and your division order will show which horizon your royalty is actually paid from.