The U.S.’s largest oil field didn’t even rank six years ago

Prudhoe Bay’s oil field in northern Alaska had previously held that spot, but it is now the third largest after the Eagle Ford field and the Spraberry Trend field in west Texas’ Permian Basin, the EIA said in a report.

Rounding up the top five, Colorado’s Wattenberg field was fourth, and Eagle Ford’s Briscoe Ranch fifth, the EIA said.

The EIA last published a ranking of U.S. largest oil CLM5, -0.55% and natural fields in 2009. Eagle Ford, discovered in 2008, didn't even appear in that 2009 list.

The EIA defines “proved reserves” as estimated quantities of oil and natural gas that can be recoverable with reasonable certainty under existing economic and operating conditions.

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