Ten of the World's Largest Oil Fields using data from the WSJ 5/22/08
Production
Reserves Production Production Billion barrels Lifetime
Country Field Billion bls barrels/day barrels/year per year years
Russia Samotlor 28 695,000 253,675,000 0.2537 110.38
Saudi Arabia Ghawar 140 4,898,000 1,787,770,000 1.7878 78.31
Saudi Arabia Safaniya 55 2,011,000 734,015,000 0.7340 74.93
Saudi Arabia Shaybah 21 590,000 215,350,000 0.2154 97.52
Iran Ahwaz 26 761,000 277,765,000 0.2778 93.60
China Saertu 9 600,000 219,000,000 0.2190 41.10
Mexico Akal 17 1,734,000 632,910,000 0.6329 26.86
UAE Zakum 21 770,000 281,050,000 0.2811 74.72
Kuwait Greater Burgan 59 1,350,000 492,750,000 0.4928 119.74
Iraq Rumaila, N & S 24 1,200,000 438,000,000 0.4380 54.79
Total Sample 400 14,609,000 5,332,285,000 5.3323 75.01
World 1,293 87,000,000 31,755,000,000 31.7550 40.72
Notes: 
1. The DOE/EIA estimated proved reserves at 1292.550 in 2006.
2. Higher production will decrease the lifetime of any field.
3. The National Geographic (6/08) published rather gloomy estimates of finding large new fields.
4. The Wall Street Journal on 7/24/08 linked to a USGS article estimating the area inside the 
      Arctic circle (6% of the Earth's surface) might contain about 90 bbls of undiscovered oil.  This
      might indicate that undiscovered oil could amount to 90/0.06 = 1500 bbls.  This is a lot of new oil, 
      but (1293 + 1500)bbls/(32 bbls/year) = 87 years which is not a long time to develop alternatives.
      The USGS Fact Sheet can be found at:  http://pubs.usgs.gov/fs/2008/3049/