World oil reserves stable despite drop in investment - BP

By Ron Bousso LONDON (Reuters) - The world's oil reserves were unchanged in 2015 despite a sharp drop in investment and exploration after the collapse in crude prices, BP said in its benchmark industry report. Proven oil and gas reserves that can be technically pumped out of the ground typically fluctuate with oil prices as production becomes more or less economically viable. Investment in oil and gas fell in 2015 by around a quarter, or $160 billion, from a year earlier, according to BP Chief E