"Using a cautious investment screening price of $90 (real) we find that, given some degree of success in implementing the Wood Review recommendations, cumulative production could be 14-15 billion barrels of oil equivalent (bn boe).
If targeted tax incentives are introduced following the current tax review the result could be 15-16.5 bn boe.
But the activity will not end then. At the year 2050 there remain many undeveloped existing discoveries containing 2.5-3 bn boe of potentially recoverable oil and gas and further new discoveries made in the period to 2045 with 1-1.5 bn boe of reserves."
http://www.energyvoice.com/2014/09/alex-kemp-potential-recovery-oil-gas/