Isotopic Characteristics and the Origin of the Coalbed Methane in Tunlan Minefield, Xishan Coalfield, Taiyuan
Keywords:Carbon Isotope, Coalbed Methane, Secondary Biogenic Gas, Thermal Degradation, Xishan Coalfield.
Few studies can be found on the origin of coalbed methane in Tunlan minefield of Xishan coalfield, Taiyuan, which leads to incomprehensive understanding of the overall characteristics of coalbed methane genesis in Xishan coalfield. Based on the chemical composition and isotope test data of 6 gas wells in Xishan coalfield, this paper discusses the origin of coalbed methane. The results show that the average volume fractions of methane, ethane, nitrogen, carbon dioxide and argon are 89.93%, 0.03%, 6.64%, 0.30% and 0.12% respectively. and the values of carbon isotope and hydrogen isotope are -43.85%~-41.3% and -238.27%~-222.45%. carbon dioxide isotope value is-12.8%~-6.0%. Data of chemical composition and isotopic test in Tunlan minefield shows that the coalbed methane has undergone secondary transformation, which is due to coal degradation. Secondary biogenic methane has been formed, which is the mixed genetic coalbed methane, and the secondary biogenic gas accounts for about 35%.
Duan, Y., Sun, T. and Liu, J. F. (2010): “Thermal simulation experimentand application of staged evolution of calbed methane carbon isotope.” Acta Sedimentologica Sinica, vol.28, no. 2, pp. 401-40.
Song, Y., Liu, S. B. and Hong, F. (2012): “Geochemical characteristics and genesis of coalbed methane in China.” Acta Petrolei Sinica, vol. 33, pp. 99-106.
Hou, Q. L., Li, H. J. and Fan, J. J. (2012): “Structure and coalbed methane occurrence in tectonically deformed coals.” Science China Earth Sci., vol. 55, no. 11, pp. 1755-1763.
Zhang, J. B. and Tao, M. X. (2000): “Geological significances of coalbed methane exploration.” Acta Sedimentologica Sinica,vol. 18, no. 4, pp. 611-614.
Qin, Y., Tang, X. Y. and Ye, J. P. (2000): “Characteristics and Origins of Stable Carbon Isotope in Coalbed Methane of China.” Journal of China University of Mining & Technology, vol. 29, no. 2, pp. 113-119.
Meng, Z. P., Zhang, J. X. and Liu, H. (2014): “Relationship betweenthe methanecarbon isotope and gas-bearing properties of coal reservoir.” Journal of China Coal Society, vol. 39, no. 8, pp. 1683-1690.
Li, J. J., Zhang, J. L. and Wang, B. Y. (2016): “Characteristics and origin of 13C(CH4) in coal-bed gas in southern Qinshui basin.” Oxidation Communications, vol. 39, no. 4-III, pp. 3835-3851.
Qin, S. F., Tang, X. Y. and Song, Y. (2006): “Distribution characteristics and fractionation mechanism of coalbed methane carbon isotope.” Science China: D Earth Sciences, vol. 36, no. 12, pp. 1092-1097.
Song, Y., Qin, S. F. and Zhao, M. J. (2007): “Two key geologicalfactors controlling thecoalbed methane reservoirs in China.” Natural Gas Geoscience, vol. 18, no. 4, pp. 545-553.
Golding, S. D., Boreham, C. J. and Esterle, J. S. (2013): “Stable isotope geochemistry of coalbed and shale gas and related production waters: AReview.” International Journal of Coal Geology, vol. 120, pp. 24-40.
Li, J. J., Bai, P. K. and Mao, H. P. (2014): “Analysis of geochemistry characteristics and its origin of CBM in Zhengzhuang and Hudi blocks.” Journal of China Coal Society, vol. 39, no. 9, pp. 1802-1811.
Hamilton, S. K., Golding, S. D. and Baublys, K. A. (2014): “Stable isotopic and molecular composition of desorbed coal seam gasesfrom the Walloon Subgroup,easternSurat Basin,Australia.” International Journal of Coal Geology, vol. 122, pp. 21-36.
Zhao, M. J. and Zhang, S. C. (2004): “Main factors for controlling geochemical characteristics of natural gas in the Tarim Basin.” Chinese Journal of Geology, vol. 39, no. 4, pp. 507-516.
Zhao, M. J., Song, Y. and Su, X. B. (2005): “Differences for geochemical controlling factors between coalbed and conventional natural gases.” Petroleum Exploration and Development, vol. 32, no. 6, pp. 21-24.
Guan, Y. B. and Li, H.M. (2001). “The structural framework and evolution of taiyuan area.” Journal of Liaoning Technical University (Natural Science), vol.20, no.1, pp.32-35.
Liu, H.L., Wang, H.Y. and Zhao, G.L. (2005). “Influence of the tectonic thermalevents in Yanshan epoch on coalbedmethane enrichment and high productivity in Xishan coalfield in Taiyuan.” Natur. Gas Ind., vol.25, no.1, pp. 29-32.
Wang, B., Jian, G. B. and Guo, Z. B. (2007): “Coalbed methane reservoir-forming characteristics of Xishan coalfield, Qin shui Basin.” Natural Gas Geoscience, vol.18, no.4, pp. 565-567.
Hu, G. Y., Guan, H. and Jiang, D. W. (2012): “Analysis of conditions forthe formation of a coal methane accumulation Qinshui coal methane field.” Geology in China, vol. 31, no. 2, pp. 213-217.
Maksimov, S. P., Muller, E. P. and Botneva, T. A. (1975): “Origin of high nitrogen gas pools.” International Geology Review, vol. 18, no. 5, pp. 551-556.
Marty, B., Criaud, A. and Fouillac C. (1988): “Low enthalpy geothermal fluids from the Paris Sedimentary Basin: Characteristics and origin of gases.” Geothermics, vol. 17, pp. 419-453.
Ju, Y. W., Li, Q. G. and Yan, Z. F. (2014): “Origin types of CBMand their geochemical research progress.” Journal of China Coal Society, vol. 39, no. 5, pp. 806-815.
Smith, J. W. and Pallasser, R. J. (1996): “Microbial origin of Australian coalbed methane.” AAPG Bulletin, vol. 80, no. 6, pp. 891-897.
Tao, M. X., Wang, W. C. and Duan, Y. (2014): “Origin and types of coalbed methane and its contribution to resources.” Beijing: Science Press, pp. 1-149.
Whitcar, M. J., Faber, E. and Schoell, M. (1986): “Biogenic methane formationinmarine and freshwater environments: CO2 reduction vs. acetate fermentation-isotope evidence.” Geochim Cosmochim Acta, vol. 50, pp. 693-709.
Xie, S. C., Yang, H. and Luo, G. M. (2012): “Geomicrobial functional groups:A window on the interaction between life and environments.” Chinese Science Bulletin, vol. 57, no. 1, pp. 3-22.
Scott, A.R., Kaiser, W.R., Ayers, W.B. (1994): “Thermo-genic and secondary biogenic gases, San Juan Basin Colorado and New Mexico-implications for coalbed gas producibility.” AAPG Bulletin, vol. 78, no. 8, pp. 1186-1209.
Whiticar, M. J. (1999): “Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane.” Chemical Geology, vol. 161, pp. 291-314.
Kotarba, M. J. (2001): “Composition and origin of coalbed gases in the Upper Silesian and Lublin basins.” Poland Organic Geochemistry, vol. 32, no. 1, pp. 163-180.
Dai, J. X., Shi, X. and Wei, Y. Z. (2001): “Summary of the inorganic origin theory and the abiogenic gas pools (fields).” Acta Petrolei Sinica, vol. 22, no. 6, pp. 5-10.
Song, Y., Liu, S. B. and Zhang, Q. (2012): “Coalbed methane genesis,occurrence and accumulation in China.” Petroleum Science, vol. 9, no. 3, pp. 269-280.
Jones, D. M., Head, I. M. and Gray, N. D. (2008): “Crudeoil biodegradation via methanogenesis in subsurface petroleum reservoirs.” Nature, vol.451, pp. 176-180.
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