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. Shaanxi Yanchang Petroleum (Group) Co., Ltd., 710075 Xi’an, China