1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, PR China;
2. School of Energy Engineering, Yulin University, Yulin, PR China;
3. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, PR China;
4. College of Economics and Management, Northwest A&F University, Yangling, PR China;
5. School of Earth Sciences and Engineering, Xi’an Petroleum University, Xi’an, PR China