U.S. to Get Half of Gas From

(Bloomberg) — The U.S. will get more than half of its natural gas supplies from so-called tight reservoirs by 2020, Royal Dutch Shell Plc estimates.

New technology will allow tapping 500 trillion cubic feet of unconventional gas resources in North America, enough to supply the U.S. for two decades, said Malcolm Brinded, executive director for the upstream business at Europe