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Analysts believe the increase in natural gas demand is in accordance with China's ambition to optimize its energy mix and replace traditional fossil fuels with cleaner ones.

Analysis from Bloomberg Intelligence estimated earlier that China will see rapid refinery expansion from 2019 to 2021, with additional capacity of 3.1 million barrels per day.

Analyst said relations between the two countries are unlikely to improve in the short term.

Anhui will use its strength in scientific innovation and industrial development to pursue future growth, Li Jinbin said.

Analysts are also wary about what lies ahead, after the OPEC-led output curb expires in the second half of 2019, though Al-Falih expressed optimism last week for the extension of the OPEC-led December agreement.