According to the U.S. Energy Information Administration (EIA), gas production form the Marcellus Shale and the neighbouring Utica Shale has soared since January 2012, accounting for 85% of the growth in natural gas production over the period. This is due to an increasing rig productivity and total production: the average new-well gas production per rig in the Marcellus region rose from 3.2 mcf/d (0.09 mcm/d) in January 2012 to 8.3 mcf/d (0.23 mcm/d) in June 2015, i.e. a 2.5-fold increase, raising the average production in the Marcellus shale region from 6.3 bcf/d (178 mcm/d) in January 2012 to 16.5 bcf/d (466 mcm/d) in June 2015. In the Utica region, the average new-well gas production per rig soared from 0.31 mcf/d to 6.9 mcf/d (from 0.009 mcm/d to 0.19 mcm/d) between January 2012 and June 2015; this contributed to an 18-fold increase in total production over this period.
US shale gas basins now account for 56% of US dry gas production.