The revolution in U.S. shale oil has battered Canada’s energy industry in recent years, ending two decades of rapid expansion and job creation in the nation’s vast oil sands. Now Canada is looking to its own shale fields to repair the economic damage. Canadian producers and global oil majors are increasingly exploring the Duvernay and Montney formations, which they say could rival the most prolific U.S. shale fields. Canada is the first country outside the United States to see the large-scale development of shale resources, which already account for 8 percent of total Canadian oil output. China, Russia and Argentina also have ample shale reserves but have yet to overcome the obstacles to full commercial development. Canada, by contrast, offers many of the same advantages that allowed oil firms to launch the shale revolution in the United States: numerous private energy firms with an appetite for risk; […]