Peak Oil

While they may keeps secrets in the middle east they cannot lie about overstating their reserves. Remember that current figures being used for oil reserves haven't changed in over 20 years.

In the mid 80's all the OPEC country greatly increased their reserves without any additional finds. Now the Saudi's, after producing almost 100 billion barrels over the past 20 years still list as their reserves about 260 billion barrels.

And lets mention that most oil field reserves were known when they were first discovered back in the 40's and 50's before they became state secrets.

For your reading pleasure: http://www.guardian.co.uk/business/2011/feb/08/saudi-oil-reserves-overstated-wikileaks

US diplomat convinced by Saudi expert that reserves of world's biggest oil exporter have been overstated by nearly 40%