An owner's guide to mineral rights on the Seminole San Andres Unit — operated by Occidental Petroleum (OXY) on the Seminole field in west Texas Permian Basin.
Get Your Free Mineral ValuationOld wells: 42
Oldest spud: 1936 (90+ years of production)
Recent monthly oil production: 44,843 bbl (Feb 2026)
The Seminole San Andres Unit is one of the most active long-tenured oil units in west Texas Permian Basin. With 42 historic wells, an oldest spud date of 1936, and recent monthly production of 44,843 barrels of oil (February 2026), the unit demonstrates the long-tail production profile that characterizes mature unitized oil operations in the Permian Basin.
OXY operates the Seminole San Andres Unit (SSAU) — one of OXY's flagship CO2 EOR projects in the Permian Basin and one of the largest CO2 floods in U.S. history.
The Seminole field sits in the Permian Basin. The field has been producing oil since 1936 — a continuous production history spanning 90+ years. Modern operating consolidation under the Seminole San Andres Unit framework has stabilized field-level production through pressure maintenance, waterflood, and (where applicable) CO2 enhanced oil recovery (EOR) operations.
For broader context on the Permian Basin producing region, see our Permian Basin mineral rights guide.
Mineral interests in the Seminole San Andres Unit typically take one of these forms:
Producing royalty interest — your tract's contribution to the unit's monthly revenue, paid by the operator
Non-producing mineral interest — fee mineral ownership in a tract currently outside active producing zones
Overriding royalty interest (ORRI) — a royalty carved out of a working interest
Non-participating royalty interest (NPRI) — a royalty interest with no leasing or development rights
Many Seminole San Andres Unit interests are inherited multiple generations deep, with original lease bonus paid in the 1930s-1960s era. Current Seminole San Andres Unit mineral owners frequently include heirs spread across multiple states.
Direct buyers value Seminole San Andres Unit mineral interests using a discounted cash flow approach with these key inputs:
Decline rate — typically 3-8% annual on long-life unitized waterflood / EOR wells
Remaining reserve life — often 15-30+ years on actively-maintained units
Operator quality — well-maintained units (Occidental Petroleum (OXY) is established in west Texas Permian Basin) typically deliver predictable production
EOR upside — many Permian Basin units have CO2 EOR or other tertiary recovery upside not reflected in current production rates
Discount rate — typically 8-12% for stable unitized cash flows
Buckhead Energy buys mineral rights and royalty interests on the Seminole San Andres Unit. Out-of-state owners are common — many interests are inherited multiple generations deep. We handle the entire process remotely: free written offer by email, deed signed before a notary in your state, recorded with the Gaines County clerk, and proceeds wired the day of recording.
Free written offers. No obligation. No fees.
Start Your Free ValuationPermian CO2 EOR (Wasson, Slaughter, Seminole) and Mississippi Jackson Dome CO2 EOR (Heidelberg, Eucutta, Tinsley) are the two largest U.S. CO2 EOR clusters. For owners with interests across both:
Texas vs Mississippi Mature Oil Units — Comparison
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