# Mississippi CO2 Floods and Enhanced Oil Recovery (EOR)

**TL;DR:** Mississippi's CO2 EOR industry depends entirely on the Jackson Dome natural CO2 reservoir in Rankin County, which supplies CO2 through the NEJD pipeline system to major flood fields like Heidelberg East, Eucutta East, and Tinsley. ExxonMobil's 2023 acquisition of Denbury Resources introduces uncertainties around CO2 allocation priorities (EOR vs. sequestration), operator capital deployment strategies, and long-term reserve life projections for mineral owners on these mature fields.

## Key Takeaways

- Jackson Dome is the only natural CO2 reservoir east of the Mississippi River and has finite remaining supply, making CO2 allocation decisions the binding economic constraint on all Mississippi EOR operations
- ExxonMobil acquired Denbury Resources in November 2023 for $4.9 billion, primarily targeting CO2 transportation and sequestration infrastructure rather than oil production
- Major Mississippi CO2 flood fields include Heidelberg East (49,508 bbl/month Jan 2026), Eucutta East (36,148 bbl/month), and Tinsley (32,852 bbl/month)
- Post-acquisition, ExxonMobil may shift CO2 allocation between oil production (EOR) and sequestration (45Q tax credits), directly affecting mineral owner royalty streams
- Cranfield field, the first commercial Mississippi CO2 flood (2008), is transitioning from EOR to sequestration-only operations under Durango Operating
- Mineral and royalty interest valuations on Jackson Dome-supplied fields must now account for CO2 supply scenario risk and potential EOR-to-sequestration transitions

## Page Highlights

**Jackson Dome CO2 Source:** The Jackson Dome reservoir in Rankin County was discovered in the 1970s and developed through the 1980s-1990s as the foundation of Mississippi's CO2 EOR industry, producing high-purity CO2 delivered via the Denbury "Green Pipeline" / NEJD system to multiple target fields.

**Major Mississippi CO2 Flood Fields:** The top producing fields include Heidelberg East (largest single-position MS CO2 flood at 49,508 bbl Jan 2026), Eucutta East (36,148 bbl), Tinsley (classic mature waterflood/CO2 field at 32,852 bbl), Heidelberg West (26,630 bbl), Brookhaven (19,107 bbl), Soso (3,931 bbl), and Cranfield (398 bbl, transitioning to sequestration).

**The ExxonMobil Acquisition:** In November 2023, ExxonMobil acquired Denbury Resources for $4.9 billion, primarily for CO2 infrastructure and sequestration capabilities rather than oil production assets. This creates uncertainty around operator-of-record migration, CO2 allocation strategy between EOR and sequestration, and capital deployment priorities.

**Cranfield CO2 Sequestration Pivot:** Cranfield field in Adams County, the first commercial Mississippi CO2 flood launched by Denbury in 2008 and the SECARB sequestration test site, is now operated by Durango Operating and transitioning from oil production to sequestration-only operations focused on 45Q tax credit revenue.

**Mineral Owner Implications:** Mineral and royalty owners on Jackson Dome-supplied CO2 floods face value uncertainty from operator-side CO2 supply allocation decisions, now controlled by ExxonMobil's broader Low Carbon Solutions strategy. Current valuations must explicitly model CO2 supply scenario risk and EOR-to-sequestration transition possibilities.

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## Related Topics

- [45Q Tax Credits for Mineral Owners](https://www.buckheadenergy.com/45q-tax-credits-mineral-owners)
- [How to Sell Mineral Rights](https://www.buckheadenergy.com/how-to-sell-mineral-rights)
- [What Are My Minerals Worth?](https://www.buckheadenergy.com/what-are-my-minerals-worth)
- [Should I Sell?](https://www.buckheadenergy.com/should-i-sell)
- [Beginner's Guide](https://www.buckheadenergy.com/beginners-guide)
- [Getting a Fair Price](https://www.buckheadenergy.com/getting-fair-price)

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