3Law B E,Curtis J B. Introduction to unconventional petroleum systems. AAPG Bull,2002;86(11) :1851-1852
4Curtis J B. Fractured shale-gas system. AAPG Bull,2002;86(11) :1921-1938
5Milici R C. Autogenic gas (self sourced) from shales-an example from the Appalachian basin. in: Howell D G,ed,the future of energy gases:U S Geological Survey Professional Paper 1570:253-278
6Tadashi A. Outlook for unconventional natural gas resources. Journal of the Janpanise Association for Petroleum Technology, 1995 ; 60(2): 128-135