You know, this has probably been posted before, but meh. In a world where either WWI was delayed, averted, or the Ottomans simply never entered, how long would it take for the oil resources to be exploited and how big of an impact would it make. Also, would this fuel (no pun intended) the conquest of more areas, such as whatever was going on in Saudi Arabia at the time, or perhaps lead to a war with the UK or another power?