Global oil, gas discoveries drop to 70-year low -Rystad Energy
* Oil and gas discoveries drop to 6 bln barrels in 2016 * Companies' reserves replacement ratio drops to 10 pct * GRAPHIC: Global oil discoveries (http://reut.rs/2jK3Qwq) By Ron Bousso LONDON, Jan 18 (Reuters) - Oil and gas discoveries around the world dropped last year to
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