AdSaudi Arabia's King Salman has removed the country's veteran oil minister as part of a broad government overhaul.
Ali al-Naimi has been replaced after more than 20 years in the role by former health minister Khaled al-Falih.
Saudi Arabia, the world's largest crude exporter, unveiled major economic reforms in April, aimed at ending the country's dependence on oil.
About 70% of its revenues came from oil last year, but it has been hit hard by falling prices.
The government shake-up, announced in a royal decree, sees a number of ministries merged and others, such as the ministry of electricity and water, scrapped altogether.
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King Salman's son Prince Mohammad directs the country's economic policy, and Mr al-Naimi's removal is an indication that he wants tighter control over the commodity, says BBC World Service Arab Affairs editor Sebastian Usher.
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Mr Falih has spent more than 30 years working at state oil giant Aramco, most recently serving as chairman.
He will take charge of a new department managing energy, industry and mineral resources.