4Ayers W B. Coalbed methane in the Fruitland Formation, San Juan Basin, Western USA: a giant, unconventional gas play. Annual Meeting Expanded Abstracts-AAPG, 2001.9.
5Mastalerz M, Kvale E P. Coalbed gas potential in Illinois Basin based on the recent data from Indiana. Annual Meeting Expanded Abstracts-AAPG, 2000. 93.
6Montgomery S L, Tabet D E, Barker C E. Upper Cretaceous sandstone: major coalbed mathane play in central Utah. AAPG Bulletin,2001, 85(2): 199-219.
7Cox M H, Groshong R H. Relationship between fractures and the structure in coalbed-mathane fields of eastern Black Warrior Basin,Alabama. Annual Meeting Expanded Abstracts-AAPG, 2000:32-33.