1. Department of Shale Gas Geological Survey, Hubei Geological Survey, Wuhan 430000, China
2. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing 163318, China
3. Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona (UB), c/Martí i Franquès s/n, 08028 Barcelona, Spain
4. Hubei Coal Geological Exploration Institute, Wuhan 430000, China