$ million 2017 2016 See Note 15. At January 1 256,583 203,066 Additions – 53,118 Share-based compensation 779 645 Recovery of vested share-based compensation (480) (246) At December 31 256,882 256,583
Shell subsidiaries’ proved reserves of crude oil, natural gas liquids (NGLs), synthetic crude oil and bitumen at the end of the year; their share of the proved reserves of joint ventures and associates at the end of the year; and the changes in such reserves during the year are set out below. [...]
Shell subsidiaries’ proved reserves of natural gas at the end of the year, their share of the proved reserves of joint ventures and associates at the end of the year, and the changes in such reserves during the year are set out below. Significant changes in these proved reserves are discussed [...]
Proved developed and undeveloped reserves of Shell subsidiaries and Shell share of joint ventures and associates Crude oil and natural gas liquids (million barrels) Natural gas (thousand million scf) Synthetic crude oil (million barrels) Bitumen (million barrels) Total (million boe) Natural gas [...]
[...] Investments Investments in subsidiaries are stated at cost, net of any impairment. For the purposes of determining whether impairment of investments in subsidiaries has occurred, and the extent of any impairment loss or its reversal, the key assumptions management uses in estimating risk-adjusted [...]
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Proved reserves