SUINING, Jan. 23, 2016 (Xinhua) -- A worker records data at a natural gas purification plant of the Longwangmiao FM Gas Reservoir in Suining City, southwest China's Sichuan Province, Jan. 22, 2016. The Longwangmiao FM Gas Reservoir, located in the central part of the Sichuan Basin, was discovered in September 2012 and was put into full production with an anual gas output of 11 billion cubic meters on October 2015. With proven gas in place of 440.383 billion cubic meters, it is so far the largest monomer marine uncompartmentalized gas reservoir in China. (Xinhua/Zhong Min)