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A pump jack draws oil near a fracking operation near Bowden in Alberta.
A pump jack draws oil near a fracking operation near Bowden in Alberta.
(Jeff McIntosh For The Globe and Mail)

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Beyond the shale: It’s game on for waterlogged oil deposits

There’s life beyond shale for U.S. oil production. The revolutionary techniques used to extract crude from rock formations have already put America on track to overtake the output from Saudi Arabia by 2017. Now, an extra 16 billion barrels are potentially within reach in residual oil zones. These water-flooded wells promise to keep the domestic output momentum going.