1. Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2. School of Earth Science & Resources, Chang’an University, Xi’an 710054, China
3. School of Economics and Management, Gansu Institute of Political Science and Law, Lanzhou 730070, Gansu, China
4. University of Chinese Academy of Science, Beijing 100049, China
5. Exploration and Development Institute of Changqing Oilfield Company, CNPC, Xi’an 710021, China