The current discount that WTI crude has to Brent is likely to be permanent, although it will narrow as pipelines carry more oil away from the Cushing pricing hub in Oklahoma, says Total SA's (TOT) Chief Economist Pierre Sigonney. In previous decades, WTI traded at a premium to Brent, but the reversal of oil flows from the US Gulf Coast to Oklahoma , following an increase in oil production in Canada and North Dakota , means the premium will also be reversed, he says, at the Platts Crude Oil Markets conference in London .

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