This year’s big news regarding the reporting of oil reserves in World Energy Outlook 2015 is that this annual report now discusses “resources that are technically possible to produce” and what proportion of these are proven reserves. When I was working on Chapter 17, The Peak of the Oil Age for my new book a few weeks ago I discussed the difference between technically producible resources and reserves. To support that discussion I made a figure explaining how different types of crude oil are classified. All the oil formed millions of years ago is termed, “Total Petroleum Initially in Place (PIIP). We have now found most of the world’s producible oil but there are still some oilfields yet to be discovered. (Details on this will be found in the book.) Of all the oil that we have already found there is some that cannot technically be produced, i.e. is […]