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Shale Oil Growth in U.S. Hurts Canadians as Well as OPEC

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OPEC isn’t the only victim of the growth in U.S. shale oil.

A surge of light oil from North Dakota and Texas is cutting into the earnings of Canadians who turn heavy oil sands into a lighter crude that fetches more from refiners. Producers in Alberta, home of the country’s greatest reserves, upgraded 20 percent less of the region’s crude in October than four years earlier, according to the province’s energy regulator.