The discovery of 'three natural gases' in the Upper Permian Leping Formation in Ganfengdi-1 well of middle Pingle depression

• TENG Long, 
• FANG Chaogang, 
• ZHENG Hongjun, 
• ZHAI Gangyi, 
• LI Jianqing, 
• HUANG Zhengqing, 
• WANG Jingdong, 
• ZHANG Hao, 
• LÜ Xing