Aerial view of Daqing, northeast China's Heilongjiang (4)

Aerial photo taken on Sept. 8, 2021 shows a demonstration zone of Daqing Oilfield in Daqing, northeast China's Heilongjiang Province. China's Daqing Oilfield announced on Aug. 25 the discovery of a major shale oil field with predicted geological reserves of about 1.27 billion tonnes. Discovered in 1959, Daqing Oilfield has made a significant contribution to China's modern petroleum industry system. It also steps up efforts to improve its ecological environment in recent years. (Xinhua/Wang Jianwei)