1. Department of Unconventional Resources, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing100083, China
2. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing100083, China
3. Department of Earth Science and Engineering, Taiyuan University of Technology, Taiyuan030024, Shanxi, China
4. Inner Mongolia Coal Exploration Unconventional Energy CO., LTD, Hohhot010010, Inner Mongolia, China