1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730030, China
2. Key Laboratory of Petroleum Resources, Lanzhou 730000, Gansu, China
3. PetroChina Changqing Oil Field Company, Xi’an 710018, China
4. School of Earth Sciences and Engineering; Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi’an Shiyou University, Xi’an 710065, China
5. University of Chinese Academy of Sciences, Beijing 100049, China