This aerial photo taken on Nov. 30, 2023 shows a drilling site of Hongde oilfield in Huanxian County of northwest China's Gansu Province. Changqing Oilfield, a branch of PetroChina, has discovered a large-scale, well-preserved oilfield with geological reserves of over 100 million tonnes in the county. [Changqing Oilfield/Handout via Xinhua]
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