1. School of Chemistry & Environmental Engineering, Yangtze University, Jingzhou 434023, P. R. China
2. Research Institute of Oil and Gas Engineering, PetroChina Tarim Oilfield Company, Korla 841000, P. R. China
3. The Shale Oil Development Department of Longdong Area, The 3rd Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 750000, P. R. China