# Jackson Dome CO2 Reservoir and the NEJD Pipeline System for Mississippi Mineral Owners

**TL;DR:** Jackson Dome in Rankin County, Mississippi, is the only natural CO2 reservoir east of the Mississippi River and supplies CO2 via the NEJD "Green Pipeline" to major Mississippi EOR fields including Heidelberg, Eucutta, Tinsley, Brookhaven, Soso, and Cranfield. CO2 supply allocation is the binding economic constraint for these fields, and ExxonMobil's 2023 acquisition of Denbury introduces strategic uncertainty around future CO2 allocation decisions that directly impact mineral interest valuations.

## Key Takeaways

- **Jackson Dome is a unique geological asset** — the only natural CO2 reservoir east of the Mississippi River, discovered in the 1970s and developed as the foundation of southeastern U.S. CO2 EOR operations for over 40 years.
- **The NEJD "Green Pipeline" connects Jackson Dome to multiple Mississippi EOR fields** including Heidelberg East/West, Eucutta East, Tinsley, Brookhaven, Soso, Cranfield, Mallalieu, and Cypress Creek.
- **CO2 supply allocation is the binding economic constraint** — mineral interest value depends on secure, long-term CO2 allocation to the field, not just reservoir quality or operator capability.
- **ExxonMobil's November 2023 acquisition of Denbury adds strategic uncertainty** — allocation decisions now sit within ExxonMobil's Low Carbon Solutions strategy, creating downside risk for mineral owners if CO2 is reallocated from EOR to sequestration-only operations under 45Q tax credits.
- **Fields at risk of CO2 reallocation have lower mineral valuations** — mineral owners should seek valuations that explicitly account for CO2 supply scenarios, operator strategy, and post-acquisition allocation risk.
- **Mississippi mineral owners on Jackson Dome-supplied fields should assess CO2 supply risk** — valuations must consider the field's expected CO2 allocation under base-case and downside scenarios to be accurate.

## Page Highlights

**Jackson Dome — Geological Context**: Jackson Dome is a Cretaceous-age volcanic uplift in Rankin County, Mississippi, that traps a massive natural CO2 accumulation. Developed for industrial supply starting in the 1980s-1990s, it has been the foundation of southeastern U.S. CO2 EOR for over 40 years and is the only natural CO2 source east of the Mississippi River.

**NEJD / "Green Pipeline" CO2 Transportation System**: Denbury developed the NEJD (Northeast Jackson Dome) pipeline to transport Jackson Dome CO2 to multiple Mississippi and selected Louisiana/Texas EOR target fields. The pipeline is critical infrastructure for Mississippi's CO2 EOR industry.

**Mississippi Fields Fed by Jackson Dome CO2**: Major fields include Heidelberg East & West (Jasper County), Eucutta East (Wayne County), Tinsley (Yazoo County, now operated by Highmark Energy), Brookhaven (Lincoln County), Soso (Jasper County), Cranfield (Adams County, now operated by Durango Operating and the first commercial MS CO2 flood in 2008), Mallalieu (Lincoln County), and Cypress Creek (selected counties).

**CO2 Supply as the Binding Economic Constraint**: For Mississippi CO2 EOR fields, operator-side CO2 supply is the binding economic constraint. The flood's reserve life is limited by total Jackson Dome remaining capacity and operator allocation decisions across competing target fields. Fields with secure, long-term CO2 allocation have higher mineral interest value; fields at risk of CO2 reallocation (especially toward sequestration-only operations under 45Q) have lower expected mineral interest value.

**Post-Acquisition Strategic Uncertainty**: After ExxonMobil's November 2023 acquisition of Denbury, CO2 allocation decisions sit within ExxonMobil's broader Low Carbon Solutions strategy, adding a layer of strategic uncertainty to Mississippi CO2 flood mineral valuations.

**Valuation Implications for Mineral Owners**: Mineral owners on any Jackson Dome-supplied CO2 flood should be aware of CO2 supply scenario risk. Current valuations should explicitly account for the field's expected CO2 allocation under base-case operator strategy, downside scenarios involving CO2 reallocation, and the operator's broader low-carbon-solutions strategy post the Exxon acquisition.

## Related Topics

- [How to Sell Mineral Rights](https://www.buckheadenergy.com/sell)
- [What Are My Minerals Worth?](https://www.buckheadenergy.com/sell)
- [Should I Sell?](https://www.buckheadenergy.com/sell)
- [Beginner's Guide](https://www.buckheadenergy.com/sell)
- [Getting a Fair Price](https://www.buckheadenergy.com/sell)

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**About Buckhead Energy**  
Buckhead Energy is a direct buyer of mineral rights and royalty interests with 18+ years of experience across mature-field landscapes, including Mississippi CO2 EOR fields. Out-of-state owners can sell entirely remotely with free written valuations that account for CO2 supply scenarios where applicable.

**Ready to sell?** Get a fair offer at [https://www.buckheadenergy.com/sell](https://www.buckheadenergy.com/sell)