Updated Oct 2013
Oil geologist Jean Laherrere who runs this website
has provided his calculation for the 2P discoveries (proven and probable)
Note that the number of fields has to be doubled in order to get at an additional 10% of oil.
We see that Laherrere’s remaining 2P reserves are 8 Gb, double the 1P reserves as published in the BP statistical review. But due to the high depletion level (around 2/3 of oil has been produced) this will not change the fact that oil production will continue to decline.
More details are here:
Peak oil and fuel subsidies in Indonesia