In this game you control one of those huge international oil companies. Your work consists of 2 main parts: Drilling oil and participating in politics. You can go to various places on the world map and look for oil there.
The bigger is your influence on the government, the more favorable their decisions will be for your business. There are elections every 4 years. You can help one of the parties with your money during the elections and it may give you "oiled" candidates.