WASHINGTON — U.S. oil production has soared to heights not seen in 20 years, largely driven by an explosion in crude harvested from Texas shale rock.

America is producing more than 7 million barrels of oil a day, the highest volume since 1992, according to figures released Thursday by the U.S. Energy Information Administration. It’s another sign of the transformation of American energy, as the nation is forecast to overtake Saudi Arabia as the world’s top oil producer in just a few years.

Texas and North Dakota are the dominant states behind the increase in oil production, with crude from the Bakken formation of North Dakota transforming that state and allowing it to pass Alaska as the nation’s second leading oil producer.