The United States has overtaken Saudi Arabia to become the world's biggest oil producer as the jump in output from shale plays has led to the second biggest oil boom in history, according to leading U.S. energy consultancy PIRA.
U.S. output, which includes natural gas liquids and biofuels, has swelled 3.2 million barrels per day (bpd) since 2009, the fastest expansion in production over a four-year period since a surge in Saudi Arabia's output from 1970-1974, PIRA said in a release on Tuesday.
It was the latest milestone for the U.S. oil sector caused by the shale revolution, which has upended global oil trade. While still the largest consumer of fuel, the rise of cheap crude available to domestic refiners has turned the United States into a significant exporter of gasoline and distillate fuels.
Last month, China surpassed the United States as the largest importer of crude, according to the U.S. government, as the rise of domestic output cuts the U.S. dependence on overseas oil.
(Read more: Cramer: Weep your heart out, Saudi Arabia)