A Mississippian-age carbonate producer of the Illinois Basin. Active waterflood operations across southeastern Illinois and Western Kentucky.
Quick answer
The McClosky Limestone (sometimes called the McClosky "sand" by older operators despite being a carbonate) is a Mississippian-age carbonate interval producing oil across the central and southeastern Illinois Basin. The McClosky typically sits at 1,800 to 2,800 feet depth and is co-developed with the Aux Vases and Cypress in many fields.
The McClosky's productivity depends heavily on local porosity development through dolomitization and karstification — the formation can be highly productive in some fields and tight in others over short geographic distances.
Age: Mississippian (Valmeyeran/Chesterian)
Depth: 1,800–2,800 feet TVD across producing area
Lithology: Limestone with dolomitic and karstic porosity development
Stacked context: Below the Renault Limestone and Aux Vases; co-developed with both
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