1. College of Earth Sciences & Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, China
3. Department of Civil Engineering, University of Nottingham, Nottingham NG7 2RD, U.K.
4. College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
5. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318,China