Very interesting, indeed. The exploration data gives us the basis for long range forecasting, otherwise than the production numbers. We can argue about the likelihood for production growing a couple years more, but it is very difficult to deny the meaning of the exploration data that precedes production by 36 years! In fact the lag is shortening especially for the offshore fields and this might mean that the production downfall will be faster than expected.
isn't this (almost) the entire PO argument - exploration peaked about 40 years ago (the exact year of the peak isn't that obvious due to noise around 1970 - could someone who has done the maths fill us in here?)

although 36 years ago is 1970, and from the graph above it looks like the peak could even of been before then.