Saudi Arabia's reserves of easily recoverable oil have long been the world's largest.
For almost 30 years - despite rising production, large swings in oil prices and improved technology - Riyadh has annually reported the same number for reserves at around 261 billion barrels, according to a statistical review by BP.
An independent external audit of Saudi Aramco's oil reserves - an essential part of the preparatory work for its planned initial public offering - found the state oil giant to have higher oil and gas reserves than it previously reported, sources familiar with the matter told Reuters in April.
He is also expected to provide further updates on the country's energy strategy.
(Reporting by Rania El Gamal, editing by Louise Heavens)
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