UPDATE 1-Tight oil is here to stay, Conoco CEO tells OPEC
June 04, 2015 at 05:20 AM EDT
VIENNA, June 4 (Reuters) - The U.S. tight-oil boom is here to stay despite low crude prices as technological breakthroughs will allow steep reductions in costs, the head of U.S. firm ConocoPhillips told a seminar organised by oil-producing group OPEC.
