FILE PHOTO: A man stands next to a logo of Sinopec, or China Petroleum and Chemical Corporation, at an expo on rubber technology in Shanghai, China September 19, 2018. Picture taken September 19, 2018. REUTERS/Stringer SINGAPORE : Sinopec Corp said on Thursday a new shale gas field in southwestern China holds nearly 146 billion cubic meters (bcm) of proven reserves that had been recently certified by the country's ministry of natural resources.