Global petroleum supply rests on a relatively small number of giant basins and fields. Some are conventional carbonate reservoirs that have flowed for decades; others are emerging shale and deepwater frontiers. Here are the major world basins every energy professional should know.
| Basin / field | Country / region | Known for |
|---|---|---|
| Ghawar | Saudi Arabia | World's largest conventional oil field |
| North Sea | UK & Norway | Offshore; Brent benchmark crude |
| West Siberian | Russia | World's largest petroleum basin |
| Vaca Muerta | Argentina | Major shale gas & oil resource |
| Montney | Canada | Tight gas & liquids |
| Jubilee | Ghana | Deepwater discovery (2007) |
Conventional giants
Ghawar in Saudi Arabia is the world's largest conventional oil field, producing from the Arab-D Jurassic carbonate. Discovered in 1948, it has yielded cumulative production exceeding 65 billion barrels. The North Sea, shared mainly by the UK and Norway, is a mature offshore province sourced by the Kimmeridge Clay and home to the Brent benchmark that prices much of the world's crude.
Russia's West Siberian Basin is the world's largest petroleum basin, covering roughly 2.2 million square kilometers. It hosts supergiant fields such as Samotlor (oil) and Urengoy (gas), and holds the Bazhenov shale, often cited as one of the largest unconventional resources on Earth.
Ghawar, discovered in 1948, has produced more than 65 billion barrels of oil — more than any other field in history — from the Arab-D Jurassic carbonate reservoir.
Emerging frontiers
Argentina's Vaca Muerta is among the most important unconventional plays outside North America, ranked as the world's second-largest shale gas and fourth-largest shale oil resource. Canada's Montney is a prolific tight gas-and-liquids play, while offshore Ghana opened a new deepwater frontier with the Jubilee discovery in 2007. Together, these basins show how the industry continues to balance mature conventional output with frontier development.
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Frequently asked
Ghawar in Saudi Arabia is the world's largest conventional oil field. Discovered in 1948, it has produced more than 65 billion barrels from the Arab-D carbonate.
The North Sea is a mature offshore province shared by the UK and Norway, sourced by the Kimmeridge Clay and home to the globally important Brent crude benchmark.
Argentina's Vaca Muerta is the world's second-largest shale gas resource and fourth-largest shale oil resource, making it a leading unconventional play outside North America.