Oil prices jumped on Friday as news of the death of Saudi Arabia’s King Abdullah added to uncertainty in energy markets already facing some of the biggest shifts in decades. Abdullah died early on Friday and his brother Salman became king in the world’s top oil exporter. Salman named his half-brother Muqrin as heir, moving to forestall any succession crisis at a moment when Saudi Arabia faces unprecedented turmoil on its borders and in oil markets. Brent crude futures rose to a high of $49.80 a barrel shortly after opening before easing back to $49.30 a barrel by 0650 GMT, up 78 cents.