Eagle Ford Shale Mineral Rights

The Eagle Ford is really three different plays stacked side by side, and which window your acreage falls in changes almost every calculator input.

The Eagle Ford Shale runs in a band across South Texas, from the Mexican border up through counties like Karnes, DeWitt, and La Salle before trailing off toward East Texas. What makes it unusual is that it divides cleanly into three commodity windows as you move updip to downdip: an oil window, a condensate-rich window in the middle, and a dry gas window on the deeper end.

For a value calculator, knowing which window your county sits in matters more here than in almost any other basin on this list, because the commodity mix input changes dramatically from one county to the next even within the same formation.

The oil window

Counties like Karnes, Gonzales, and parts of DeWitt sit in the Eagle Ford's oil window, where wells produce predominantly crude oil with a smaller associated gas stream. This is generally considered the most consistently valuable part of the play, benefiting from stronger, more liquid oil pricing rather than being exposed to regional gas basis swings.

If your tract is in this window, the calculator's price-mix input should lean heavily oil-weighted, and the basin's well density here has historically supported fairly active continued development compared to the gassier fringes.

The condensate window

Moving downdip, a middle band of counties sits in the condensate-rich window, producing a mix of light oil, condensate, and wet gas with meaningful NGL content. Pricing for condensate and NGLs tracks a blend of oil and gas markets, which makes this window's economics a bit more complex to model than a pure oil or pure gas play.

If your royalty statement shows condensate and NGL line items alongside oil and gas, that's a strong sign you're in this window, and the calculator should use a blended price input rather than treating the production as simple crude oil.

The dry gas window

The deepest, most downdip portion of the Eagle Ford trends toward dry gas, with little to no liquids content. This part of the play has generally seen less consistent development interest than the oil window, since operator capital across the industry has leaned toward oil-weighted returns for much of the last decade.

If your acreage sits in the dry gas window, a conservative calculator range is appropriate, both because of thinner recent drilling history in this part of the play and because gas pricing alone, without an oil or condensate cushion, tends to be more volatile for royalty income. Some dry gas window acreage saw a brief revival of interest when gas prices strengthened in certain periods, so it's worth checking current activity rather than assuming permanent dormancy.

A mature play with real re-frac and infill activity

The Eagle Ford was developed heavily starting around 2010, and while it isn't the newest unconventional play anymore, operators have continued infill drilling and, in some areas, refracturing older wells to recover additional resource that original completions left behind. If your tract has an older well that's been reworked or has newer infill wells added to the unit since the original completion, that additional activity is worth entering into the calculator separately, since it represents real incremental value beyond the original well's remaining decline.