In 2022, Oklahoma had about 1.8 billion barrels of proved crude oil reserves, about 4% of the nation's total. 50 In 2023, Oklahoma produced about 157 million barrels of crude oil, the fifth-largest amount among the states, and accounted for about 3.3% of the nation's total annual crude oil production. 51 Although most oil fields are in the eastern half of the state and most natural gas fields ... More @Wikipedia
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