Its useful to point out that although the standard accounting method was used for the official numbers, at least one of the drilling companies in this article a

Its useful to point out that although the standard accounting method was used for the official numbers, at least one of the drilling companies in this article also included the impact of current prices on their reserves. Investors care about this, know about it, and at least some of the the companies give them information so it can be properly priced in.