1. School of Economics and Management, China University of Petroleum, Beijing, China + CNPC Economics and Technology Research Institute, Beijing, China + Key Laboratory of Oil and Gas Market Simulation and Price Forecast, China National Petroleum Corporation, Beijing, China
2. CNPC Economics and Technology Research Institute, Beijing, China + Key Laboratory of Oil and Gas Market Simulation and Price Forecast, China National Petroleum Corporation, Beijing, China
3. Institutes of Science and Development, Chinese Academy of Sciences, Beijing, China