A major shale oil production zone in northwest China's Xinjiang Uygur Autonomous Region reported its crude oil output exceeding 1.7 million tonnes so far this year, marking a significant breakthrough in the country's shale oil development, China National Petroleum Corporation (CNPC) announced on Tuesday.The shale oil output of the zone saw a 4.2-fold increase from 322,000 tonnes in 2020, said Du Xuebiao, manager of Jiqing oilfield operation zone of CNPC's Xinjiang Oilfield.In the face of complex geological conditions and technical challenges, researchers and technicians at the zone have explored a whole system of techniques to boost the production with high...