1. School of Petroleum Engineering, Xi’an Shiyou University, 710065 Xi’an, China
2. Engineering Research Center of Development and Management for Low to Ultra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, 710065 Xi’an, China
3. Xi’an Key Laboratory of Tight Oil (Shale Oil) Development, 710065 Xi’an, China
4. Oil and Gas Technology Institute of Changqing Oilfield Company, PetroChina, 710018 Xi’an, China
5. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, 710018 Xi’an, China