1. Key Laboratory of Computational Geodynamics, College of Earth and Planetary SciencesUniversity of Chinese Academy of Sciences Beijing 100049 China
2. Department of Earth SciencesDurham University Durham DH1 3LE UK
3. China United Coalbed Methane Co Ltd Beijing 100011 China
4. State Key Laboratory Cultivation Base for Gas Geology and Gas ControlHenan Polytechnic University Jiaozuo Henan 454000 China
5. College of GeosciencesChina University of Petroleum Beijing 102249 China