Low replenishment of reserves causes headaches for Petrovietnam stockbot 0 380 2023.02.18 10:06 https://vietnamnews.vn/economy/1484798/low-replenishment-of-reserves-c… + 3 https://vietnamnews.vn/rss/economy.rss + 7 The ratio of reserve growth to extraction growth must surpass 100 per cent to keep oil production sustainable. A ratio of 55 per cent means that extraction has been eating into reserves over the past few years.