China National Petroleum Corp. (CNPC) has discovered a new oil field in the Erdos Basin in the northern Chinese region of Inner Mongolia, with proven geological reserves of more than 1 billion tonnes shale oil, Xinhua reported June 20.

The new oil field, Qingcheng, is part of CNPC’s Changqing oil field and is China’s biggest shale oil field discovered by far in terms of proven geological reserves scale, the state-backed news agency said.

With rapid development in the region, shale oil production at Changqing oil field is likely to reach 3 million tonnes per annum by 2025, Xinhua said

CNPC on June 18 also announced a 1 billion tonne super-deep oil and gas resources discovery in Tarim basin in Xinjiang region.