China OilChina Oil Co discovered 1 billion tonnes of reserves in northwest ChinaNewsOctober 1, 2019October 1, 2019 by NewsOctober 1, 2019October 1, 201900 According to China National Petroleum Corporation (CNPC), the proven reserves at Qingcheng oilfield in the Ordos basin stand at 358 million tons, while its estimated...