I don't think anyone can answer that question based on first principles. It looks like the perfect conditions for incomplete combustion with aerosolized petroleum violently mixing with sea water that's getting rapidly pushed away by the force of the explosion.

On on the one hand, it might spread out the petroleum and prevent an oil slick from forming, making it less ecologically damaging. On the other hand, it might be combusting a negligible amount of the fuel and spreading the rest as tiny particles that aren't small enough to overcome a turbulent sea and collect at the surface, so they enter the respiratory and digestive systems of everything in the gulf.