4 Kotarba M J. Composition and origin of coalbed gases in the Upper Silesian and Lublin basins. Poland Org Geochem, 2001, 32: 163-180
[4]
7 Aravena R, Harrison S M, Barker J F, et al. Origin of methane in the Elk Valley coalfield, southeastern British Columbia, Canada. Chem Geol, 2003, 195: 219-227
11 Tao M X. The Secondary Biogenic Methane Found In The Xinji Coalfield, Anhui Province, China. AAAPG-2004, 6th International Conferece. Abstracts, 228-229
16 Tao M X, Shi B G, Li J Y, et al. Secondary biological coalbed gas in the Xinji area, Anhui province, China: Evidence from the geochemical features and secondary changes. Int J Coal Geol, 2007, 71: 358-370
[12]
17 Tao M X, Li J, Li X B, et al. New approaches and markers for identifying secondary biogenic coalbed gas. Acta Geol Sin, 2012, 86: 199-208
24 Coleman D D, Risatti J B, Schoell M, et al. Fractionation of carbon and hydrogen isotopes by methane-oxidizing bacteria. Geochim Cosmochim Acta, 1981, 45: 1033-1037
31 Chosson P, Connan J, Dessort D, et al. In vitro biodegradation of steranes and trepans: A clue to understanding geological situations. In: Moldowan J M, Albrecht P, Philp R P, eds. Biological Markers in Sediments and Petroleum. Prentice Hall, Englewood Cliffs, 1992. 320-394
[21]
32 Peters K E, Moldowan J M. The Biomarker Guide. Prentice Hall, Englewood Cliffs, 1993. 1-50
[22]
1 Rightmire C T, Eddy G E, Kirr J N. Coalbed methane resources of the United States. AAPG Studies in Geology Series#17, Tulsa, Oklahoma, USA: Am Assoc Pet Geol, 1984. 1-378
[23]
5 Kotarba M J, Rice D D. Composition and origin of coalbed gases in the Lower Silesian, southwest Poland. Appl Geochem, 2001, 16: 895-910
[24]
6 Ho？g？rmez H, Yal？？n M N, Cramer B, et al. Isotopic and molecular composition of coal-bed gas in the Amasra region (Zonguldak basin-western Black Sea). Org Geochem, 2002, 33: 1429-1439
[25]
8 Thielemann T, Cramer B, Schippers A. Coalbed methane in the Ruhr Basin, Germany: A renewable energy resource? Org Geochem, 2004, 35: 1537-1549
[26]
9 Butland C I, Moore T A. Secondary biogenic coal seam gas reservoirs in New Zealand: A preliminary assessment of gas contents. Int J Coal Geol, 2008, 76: 151-165
21 Rice D D. Composition and origins of coalbed gas. In: Law B E, Rice D D, eds. Hydrocarbons from Coal. AAPG Studies in Geology Series #38. Tulsa, Oklahoma, USA, 1993. 159-183
[30]
22 Whiticar M J. Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane. Chem Geol, 1999, 161: 291-314
[31]
23 Smith J W, Pallasser R J. Microbial origin of Australian coalbed methane. Am Assoc Pet Geol Bull, 1996, 80: 891-897
35 Kotarba M J, Lewan M D. Characterizing thermogenic coalbed gas from Polish coals of different ranks by hydrous pyrolysis. Org Geochem, 2004, 35: 615-646
