Saudi Arabia, Iraq, United Arab Emirates, Kuwait, Iran, and Oman were all among the top 15 exporters of crude oil in 2015. Russia and Kazakhstan, countries on the Central Asian part of the map, were also members of that same group.
Regimes in the region found that there were many other corollary benefits from this economic might. Unrest could be stifled by rising wealth, and these countries would also have more influence than they otherwise would in global affairs. Saudi Arabia is a good example in both cases, though a major driver of Saudi influence has been slipping in recent years.