1. School of Petroleum Engineering, Xi’an Shiyou University, Xi’an, China 710065
2. Engineering Research Center of Development and Management for Low to Ultra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an, China 710065
3. Xi’an Key Laboratory of Tight Oil (Shale Oil) Development, Xi’an, China 710065
4. Oil and Gas Technology Institute of Changqing Oilfield Company, PetroChina, Xi ’an, China 710018
5. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, China 710018
6. McDougall School of Petroleum Engineering, The University of Tulsa, Tulsa, Oklahoma 74104-9700, United States