Generally speaking, the distribution of crude oil is extremely unbalanced: from the eastern and western hemispheres, about 3/4 of the oil resources are concentrated in the eastern hemisphere, and the western hemisphere accounts for1/4; From the perspective of the northern and southern hemispheres, oil resources are mainly concentrated in the northern hemisphere; From the perspective of latitude distribution, it is mainly concentrated in two latitudes: 20-40 and 50-70 north latitude. The two major oil regions, the Persian Gulf and the Gulf of Mexico, and the oil fields in North Africa are all located within 20-40 north latitude, which accounts for 5 1.3% of the world's oil reserves. There are famous Beihai oil fields, Russian Volga and Siberia oil fields and gulf of alaska oil fields in the zone of 50-70 north latitude. About 80% of the recoverable oil reserves are located in the Middle East, of which 62.5% are located in Saudi Arabia (12.5%), United Arab Emirates, Iraq, Qatar and Kuwait.