How Many Oil Fields Exist Worldwide? Estimates and Distribution

No definitive count exists—fields are discovered, depleted, redefined. But industry sources converge on tens of thousands.

Key Estimates

• Oil & Gas Journal (2019): ~70,000 fields globally (active + inactive).
• Rystad Energy: ~50,000 commercial fields.
• IHS Markit: ~65,000 identified accumulations.

Definition varies: some count each reservoir separately; others group by geographic/geologic unit.

Geographic Concentration

Top countries by field count/reserves:

• Saudi Arabia: ~100 major fields (Ghawar, Safaniya, Khurais). 17% world reserves.
• Russia: ~300 fields (West Siberia: Samotlor, Priobskoye).
• United States: ~30,000 fields (Permian, Bakken, Eagle Ford, Gulf of Mexico). Most numerous; many small.
• Iran: ~100 fields (Ahvaz, Marun, Gachsaran).
• Iraq: ~70 fields (Rumaila, West Qurna, Majnoon).
• Venezuela: ~50 fields (Orinoco Belt—huge extra-heavy oil).
• Canada: Oil sands (Athabasca, Cold Lake, Peace River) counted as few mega-projects.

Field Sizes

• Giants (>500M bbl): ~500 globally, hold ~60% reserves.
• Super-giants (>5B bbl): ~20 (Ghawar, Burgan, Safaniya, Cantarell, etc.).
• Most fields are small (<10M bbl).

Dynamic Nature

• New discoveries: Guyana (Stabroek block), Namibia, Suriname.
• Revisions: Enhanced recovery, reclassification.
• Stranded assets: Climate policy may leave many undeveloped.

The number is a moving target. What matters: reserve quality, extraction cost, carbon intensity.