1. National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum, Beijing 102249, China
2. Research Institute of Petroleum Exploration and Development, Beijing 100083, China
3. PetroChina Qinghai Oilfield Company, Dunhuang 736200, China
4. Qinghai Provincial Key Laboratory of Plateau Saline-Lacustrine Basinal Oil & Gas Geology, Dunhuang 736202, China