1. 1 Shale Gas Research Institute PetroChina Southwest Oil & Gas Field Company Chengdu Sichuan 610051 China cnpc.com.cn
2. 2 China National Petroleum Corporation Beijing 100007 China cnpc.com.cn
3. 3 Department of Geotechnical Engineering College of Civil Engineering Tongji University Shanghai 200092 China tongji.edu.cn
4. 4 School of Civil Engineering and Geomatics Southwest Petroleum University Chengdu Sichuan 610500 China swpu.edu.cn
5. 5 State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China cas.cn
6. 6 Institute of Mining Technology Taiyuan University of Technology Taiyuan 030024 China tyut.edu.cn
7. 7 Shanxi Wangjialing Coal Industry Co. Ltd. Xinzhou 036600 China
8. 8 Research Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China cnpc.com.cn
9. 9 HydroChina ITASCA R and D Center Hangzhou 311122 China