1. College of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi’an Shiyou University, Xi’an 710065, China
3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
4. Exploration Department, PetroChina Changqing Oilfield Company, Xi’an 710000, China