EIA reserve estimates for USA for 2016 have been issued (a couple of months later than usual). The numbers they provide are ‘proven’ reserves of crude, condensate and natural gas.
The data is provided directly by the E&Ps with some adjustments made by EIA for missing numbers. The data show reserves for the end of a given year, plus the reasons for change over the year: basically discoveries, production, revisions and sales. Until 2015 EIA had different categories for discovery (essentially a new reservoir, although there may be new pockets in existing freservoir) and extension (an increase in the area of an existing field). Recently most of this category has been extensions to LTO fields (i.e. an increase in the expected economic drainage area of a play). This year the reporting has changed so all discoveries and extensions are reported as a single figure and I’ve shown only this sum for previous years too. I have summed revision gains and losses plus adjustments to give a net number, and similarly for sales and acquisitions.
This year the data include non-producing reserves. I don’t know for sure if this is new but I haven’t noticed it before and can’t find any history for previous years. ‘Non-producing’ may mean reserves behind wells that are offline (e.g. are uncompleted, for maintenance or because of lack of processing or transport capacity); or that have real development plans for their production (typically starting within the next five years according to SEC rules, although for large, long cycle conventional projects the time can be extended). The undeveloped values for 2016 are shown on each chart.
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