Each of these 40 companies is one of the largest producers and/or one of the most active operators in a major U.S. shale play. The U.S. Energy Information Administration (EIA) estimated that in 2017 about 4.67 MM-bbl/d of crude oil was produced direcdy from tight oil resources in the U.S. "This was equal to about 50% of total U.S. crude oil production in 2017," according to the EIA's website. In addition, the EIA estimated that in 2017 about 16.86 Tcf of dry natural gas was produced from shale resources in the U.S., which was about 62% of total U.S. dry natural gas production that year.
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