Guyana, with 800,000 inhabitants, is already the country with the most reserves per capita in the world -- over 10 billion barrels of oil equivalent -- ahead even of Brunei, Kuwait or the United Arab Emirates.

Guyana has pledged to a group of Saudi investors visiting the South American country to remove all hurdles in the way of making investment.

US giant ExxonMobil announced in April the discovery of three new oil deposits in Guyana, raising estimates of the country's oil reserves to the equivalent of 11 billion barrels. Those discoveries fueled Guyana's existing border dispute with Venezuela, which wants to explore territorial waters claimed by both countries.

Aramco has bagged a one-year contract from Guyana to market the crude oil produced in the South American country.