Jean Laherrere has posted the following charts and comments on Bakken and World oil reserves.
EIA proved reserves on Bakken (ND +Montana) plus cumulative production have changed at end :
-2012 3754 Mb
-2013 5701 Mb
-2014 7203 Mb
-2015 6671 Mb
As shown in this graph in red squares, together with HL ultimates, USGS estimates and cumulative production.
ThisEIA CP+RR value (which is assumed to trend towards the oil ultimate) has increased sharply from 2012 to 2014 and has decreased in 2015 (this decrease may continue towards which value?).