# New Albany Shale Mineral Rights in the Illinois Basin

**TL;DR:** The New Albany Shale is an Upper Devonian organic-rich black shale underlying the Illinois Basin across southern Illinois, southwestern Indiana, and western Kentucky. While historically underexplored compared to plays like the Marcellus or Bakken, recent advances in horizontal drilling have renewed wildcat exploration interest in this emerging unconventional play. Mineral owners should carefully review legacy lease language, as most existing Illinois Basin leases were drafted for conventional shallow production and may not cover deeper unconventional formations.

## Key Takeaways

- **The New Albany Shale is a stratigraphic equivalent to the Marcellus and Antrim shales**, with USGS assessments estimating more than 300 billion barrels of original oil in place and multi-trillion-cubic-feet undiscovered gas resources across the Illinois Basin.

- **The formation sits at approximately 2,000–5,000 feet true vertical depth** and exhibits organic-rich black shale characteristics with total organic content (TOC) commonly ranging from 6–15%.

- **The hydrocarbon window varies by position**: oil-prone in updip eastern positions and gas-prone in deeper downdip western positions across the basin.

- **Most existing Illinois Basin leases were drafted for conventional shallow production** (Aux Vases, Cypress, McClosky waterfloods) and may include depth limitations that exclude the New Albany interval.

- **Mineral owners in affected counties should review lease language with a qualified oil and gas attorney** before signing any new lease, ratification, or amendment to ensure deeper formations are properly addressed.

- **Active exposure spans multiple counties** including Wabash, Crawford, Lawrence, White, Wayne, Hamilton, Saline, and Gallatin in Illinois; Posey, Gibson, Knox, Sullivan, Daviess, Greene, and Pike in Indiana; and Henderson, Daviess, Hopkins, Webster, Union, and McLean in Kentucky.

- **Recent technological advances in horizontal drilling and completion techniques** have sparked renewed exploration interest in a play that has historically seen modest development activity relative to other major shale plays.

## Page Highlights

**Formation Basics:** The New Albany Shale is an Upper Devonian (~365 million years old) organic-rich black shale formation underlying much of the Illinois Basin, characterized by natural fracture systems and high organic content similar to better-known shale plays.

**Geologic Characteristics:** The formation sits at 2,000–5,000 feet depth with TOC commonly 6–15%, exhibiting variable natural fracture patterns and a hydrocarbon window that shifts from oil-prone in updip eastern areas to gas-prone in deeper western positions.

**Geographic Coverage:** The play extends across southern Illinois (8 counties listed), southwestern Indiana (7 counties listed), and western Kentucky (6 counties listed), representing significant geographic exposure across the Illinois Basin.

**Lease Language Concerns:** Most legacy Illinois Basin leases were written during the conventional waterflood era and may not address deeper unconventional formations, creating potential coverage gaps that mineral owners should evaluate with qualified legal counsel.

**Development Status:** While USGS resource assessments are substantial, historical development has been modest compared to major shale plays, though recent drilling and completion technology advances have generated renewed wildcat exploration activity.

## Related Topics

- [How to Sell Mineral Rights](https://www.buckheadenergy.com/sell) - Process overview for mineral rights transactions
- [What Are My Minerals Worth?](https://www.buckheadenergy.com/sell) - Mineral rights valuation factors
- [Should I Sell?](https://www.buckheadenergy.com/sell) - Decision framework for mineral owners
- [Beginner's Guide](https://www.buckheadenergy.com/sell) - Introduction to mineral rights ownership
- [Getting a Fair Price](https://www.buckheadenergy.com/sell) - Pricing considerations for sellers

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