U.S. oil production has grown rapidly in recent years. EIA data, which reflect combined production of crude oil and lease condensate, show a rise from 5.6 million barrels per day (b/d) in 2011 to 7.5 million b/d in 2013, and a record 1.2 million b/d increase to 8.7 million b/d in 2014. Increasing production of light crude oil in low-permeability or tight resource formations in regions like the Bakken, Permian Basin, and Eagle Ford (often referred to as light tight oil) account for nearly all the net growth in U.S. crude oil production. Roughly 90% of the nearly 3.0 million b/d growth in production between 2011 and 2014 consists of sweet grades with an API gravity of 40 or above. ...