Andrew Burton/Getty There have been mounting oil supply concerns over recent months. But now Saudi Arabia is promising record production and the US is mulling an SPR release. Still, the oil market remains vulnerable to supply shocks. Time to say goodbye to the backwardation? One of the most interesting changes in the oil market has been the ICE Brent forward curve, the front end has flattened considerably, which has seen the backwardation in the prompt spread flip to contango.