PetroChina's logo is seen at its petrol station in Beijing
PetroChina's logo is seen at its petrol station in Beijing, China, March 21, 2016. PetroChina, China's biggest oil and gas producer, reported a 70 percent slumpin its full-year 2015 profit, with earnings upstream and in the marketing segment both taking a hit from lower prices. Picture taken March 21, 2016. REUTERS/Kim Kyung-Hoon