A Lower Cretaceous unconventional shale across South and South-Central Texas. Active EOG, Formentera, and other operator de-risking activity in 2025–2026.
Quick answer
The Pearsall Shale is a Lower Cretaceous (Aptian-age) organic-rich shale underlying portions of South Texas, sitting beneath the Eagle Ford Shale and the Austin Chalk. The Pearsall has been recognized as a hydrocarbon source rock for decades, but commercial completion as an unconventional target was challenging through the 2010s. Recent improvements in completion design and renewed exploration interest from operators including EOG Resources and Formentera Partners have produced active 2025–2026 horizontal de-risking activity.
Age: Lower Cretaceous (Aptian, ~120 million years)
Depth: Approximately 7,000–11,000 feet TVD across the producing trend
Lithology: Organic-rich black shale and marl with multiple internal benches
Stacked relationships: Beneath the Eagle Ford and Austin Chalk; many Pearsall horizontals on acreage with stacked-pay completions in the upper formations
Frio County, TX — Pearsall's namesake area
La Salle County, TX
Atascosa County, TX
McMullen County, TX
Maverick County, TX
Step-out testing extending toward Brazos, Burleson, Grimes (Austin Chalk fairway depth)
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