# Seminole San Andres Unit Mineral Rights — Gaines County, Texas

**TL;DR:** The Seminole San Andres Unit is a mature, long-producing oil unit in Gaines County, Texas, operated by Occidental Petroleum with 90+ years of continuous production since 1936. With 42 historic wells and February 2026 production of 44,843 barrels of oil, the unit represents one of OXY's flagship CO2 enhanced oil recovery (EOR) projects in the Permian Basin, delivering stable long-tail royalty income to mineral owners across multiple generations.

## Key Takeaways

- **Operator & Location:** Occidental Petroleum (OXY) operates the Seminole San Andres Unit in Gaines County, Texas (RRC District 11), within the Seminole field of the Permian Basin
- **Production History:** Continuous oil production since 1936 (90+ years), with 42 historic wells demonstrating long-tail production profile characteristic of mature unitized operations
- **Current Production:** Recent monthly production of 44,843 barrels of oil (February 2026) reflects active, stabilized field-level performance through pressure maintenance and enhanced recovery operations
- **CO2 EOR Operations:** The unit is one of OXY's flagship CO2 enhanced oil recovery projects and one of the largest CO2 floods in U.S. history, providing potential upside not reflected in current production rates
- **Mineral Interest Types:** Owners typically hold producing royalty interests, non-producing mineral interests, overriding royalty interests (ORRI), or non-participating royalty interests (NPRI), often inherited multiple generations deep
- **Valuation Factors:** Direct buyers use 3-8% annual decline rates, 15-30+ year reserve life estimates, 8-12% discount rates, and account for CO2 EOR upside potential in valuation models
- **Remote Sales Process:** Out-of-state mineral owners (common due to multi-generational inheritance) can complete the entire sales transaction remotely through a direct buyer with free written offers, notary signing, county recording, and same-day wire transfer
- **Stable Cash Flow Profile:** Unitized waterflood/EOR operations under an established operator typically deliver predictable, long-duration royalty income compared to conventional primary production

## Page Highlights

**Unit Overview:** The Seminole San Andres Unit is a 42-well mature oil unit in Gaines County, Texas, with production dating to 1936 and recent monthly output of 44,843 barrels. Occidental Petroleum operates the unit as one of its flagship CO2 EOR projects in the Permian Basin.

**Field Geology & Production:** The Seminole field has maintained continuous production for 90+ years through modern unitized operations including pressure maintenance, waterflood, and CO2 enhanced oil recovery, stabilizing field-level production through tertiary recovery methods.

**Mineral Interest Profile:** Mineral interests typically include producing royalty interests, non-producing mineral interests, overriding royalty interests (ORRI), and non-participating royalty interests (NPRI), with many interests inherited multiple generations from original 1930s-1960s lease bonuses.

**Valuation Considerations:** Direct buyers evaluate interests using discounted cash flow models incorporating 3-8% annual decline rates, 15-30+ year reserve life, operator quality, CO2 EOR upside potential, and 8-12% discount rates for stable unitized cash flows.

**Selling Process:** Buckhead Energy handles remote transactions for out-of-state owners through free written offers, notary-signed deeds, Gaines County clerk recording, and same-day wire transfer of proceeds.

**CO2 EOR Comparison:** The page positions the Seminole San Andres Unit within the broader Permian CO2 EOR cluster (alongside Wasson and Slaughter fields) and compares it to Mississippi's Jackson Dome CO2 EOR operations for owners with interests across both regions.

## Related Topics

- [How to Sell Mineral Rights](https://www.buckheadenergy.com/sell) — general guide to the mineral rights sales process
- [What Are My Minerals Worth?](https://www.buckheadenergy.com/sell) — valuation methodology and factors
- [Permian Basin Mineral Rights Guide](https://www.buckheadenergy.com/sell) — broader context on the Permian Basin producing region
- [Texas vs Mississippi Mature Oil Units — Comparison](https://www.buckheadenergy.com/sell) — comparative analysis for owners with multi-state interests
- [Mississippi CO2 Floods Overview](https://www.buckheadenergy.com/sell) — Jackson Dome CO2 EOR operations
- [Mississippi Mineral Rights State Hub](https://www.buckheadenergy.com/sell) — state-level mineral rights information

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**About Buckhead Energy:** Buckhead Energy is a direct buyer of mineral rights and royalty interests with 18+ years of experience acquiring producing and non-producing mineral interests across the United States. We provide transparent, no-obligation written offers and handle the entire transaction process remotely for mineral owners nationwide.

**Ready to sell your Seminole San Andres Unit mineral rights?** Get your free, no-obligation written valuation at https://www.buckheadenergy.com/sell