Eagle
Ford

The Eagle Ford is a Late Cretaceous shale formation that became one of the first major US shale plays to see large-scale horizontal development. Active development covers a roughly 50-mile-wide trend running from the Mexican border northeast through south Texas, with the most heavily-drilled counties including DeWitt, Karnes, Gonzales, La Salle, McMullen, Atascosa, and Frio. The play sits at depths of roughly 4,000 to 14,000 feet depending on location, with the deeper southern portion producing primarily natural gas and the shallower northern portion producing primarily oil.

The Eagle Ford’s defining geological feature is its three production windows defined by thermal maturity. The black oil window in the north produces primarily oil and limited associated gas. The volatile oil and condensate window in the central part of the play produces a mix of light oil, condensate, and rich natural gas with substantial NGL content. The dry gas window in the south produces primarily methane. Mineral owners can hold interests in any of these windows, and the type of production fundamentally shapes what royalty income looks like.

EOG Resources was one of the original developers of horizontal Eagle Ford and remains the most active operator in the play. ConocoPhillips’s 2024 acquisition of Marathon Oil added a substantial Eagle Ford position alongside Marathon’s Bakken and Anadarko Basin assets. Expand Energy (formed from the 2024 Chesapeake-Southwestern merger) and Devon Energy also hold meaningful positions. Several private operators are active in specific areas of the play.

The Eagle Ford is now in its mature horizontal development phase. New drilling continues on a sustained basis, particularly in the oil window where commodity prices support the strongest economics. Re-fracs and infill drilling on existing pads add additional production from acreage already developed. For mineral owners, the practical result is a steady ongoing royalty stream from existing wells plus selective new well drilling that adds incremental production over time.

The Eagle Ford produces exclusively in Texas, with active development concentrated in a relatively narrow geographic band running northeast from the Mexican border. The most heavily-drilled core counties include Karnes, DeWitt, Gonzales, La Salle, McMullen, Atascosa, and Frio. Karnes County in particular sits in the oil window core and is one of the most actively-developed counties in the play.

Surrounding counties in the volatile oil window (Webb, Dimmit, Zavala) and the dry gas window (Maverick) also host significant development, with operator activity concentrated in specific structural positions rather than blanket section-by-section drilling. Some Eagle Ford acreage sits in counties we have not yet built dedicated pages for, but we work mineral interests across the full Eagle Ford footprint.

Mineral rights in the Eagle Ford are typically valued based on which production window the tract sits in and the maturity of development on adjacent acreage. Oil window owners in Karnes and similar core counties typically command the strongest valuations because oil-window economics support sustained drilling activity. Volatile and dry gas window owners receive royalty income tied more directly to natural gas and NGL prices, which has its own volatility profile.

The Eagle Ford’s mature development means most actively-leased acreage in the core counties has seen at least one round of drilling. Many tracts have multiple wells on a single drilling spacing unit, generating staged royalty income across years. Re-fracs and infill drilling can extend the productive life of older wells and add new wells to existing units.

ConocoPhillips’s 2024 acquisition of Marathon Oil affected many Eagle Ford royalty owners. Marathon was a significant Eagle Ford operator, and the transition transferred operator of record on a meaningful number of wells. If your records still show Marathon, the underlying interest carried over to ConocoPhillips unchanged. The current operator on any specific well can be confirmed through the Texas Railroad Commission well search by API number.

If you are considering selling mineral rights in the Eagle Ford, the play’s maturity makes valuations relatively straightforward to establish. We pull operator activity in your specific spacing unit, identify nearby permits and active drilling, look at lease language, and produce a written analysis of what your interest is worth. We are happy to do this for any Eagle Ford tract regardless of size or production window.