Canada regulator says northern oil shale may hold 200 bln barrels
May 22, 2015 at 16:23 PM EDT
CALGARY, Alberta, May 22 (Reuters) - Two prospective shale-oil fields in Canada's Northwest Territories may contain more than 200 billion barrels of crude, according to a study released on Friday by the country's energy regulator, but only a fraction of that amount will be recoverable.