Tarim Oilfield in northwest China's Xinjiang Uygur Autonomous Region has supplied over 300 billion cubic meters of natural gas to central and eastern parts of China via the country's West-East gas pipeline, the China National Petroleum Corporation (CNPC) said on Monday. The oilfield has 19 large and medium-sized gas fields that supply about 31.9 billion cubic meters of natural gas per year, accounting for one-sixth of the national total, according to CNPC.