Stable Isotope Systematics of Coalbed Gas during Desorption and Production

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dc.contributor.authorNiemann, Martin
dc.contributor.authorWhiticar, Michael J.
dc.date.accessioned2018-08-27T13:57:04Z
dc.date.available2018-08-27T13:57:04Z
dc.date.copyright2017en_US
dc.date.issued2017
dc.description.abstractThe stable carbon isotope ratios of coalbed methane (CBM) demonstrate diagnostic changes that systematically vary with production and desorption times. These shifts can provide decisive, predictive information on the behaviour and potential performance of CBM operations. Samples from producing CBM wells show a general depletion in C-13-methane with increasing production times and corresponding shifts in delta C-13-CH4 up to 35.8 parts per thousand. Samples from canister desorption experiments show mostly enrichment in C-13 for methane with increasing desorption time and isotope shifts of up to 43.4 parts per thousand. Also, C-13-depletion was observed in some samples with isotope shifts of up to 32.1 parts per thousand. Overall, the magnitudes of the observed isotope shifts vary considerably between different sample sets, but also within samples from the same source. The delta C-13-CH4 values do not have the anticipated signature of methane generated from coal. This indicates that secondary processes, including desorption and diffusion, can influence the values. It is also challenging to deconvolute these various secondary processes because their molecular and isotope effects can have similar directions and/or magnitudes. In some instances, significant alteration of CBM gases has to be considered as a combination of secondary alteration effects.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThe samples provided by several energy companies for the research are gratefully acknowledged. Funding of this work was provided by research grants from NSERC (MJW) and the British Columbia Ministry for Energy and Mines. Special thanks to Paul Eby for analytical support and Barry Ryan for his time, support and help throughout the work. We would also like to thank the reviewers for their helpful comments, which made the manuscript clearer and more precise.en_US
dc.identifier.citationNiemann, M. & Whiticar, M.J. (2017). Stable isotope systematics of coalbed gas during desorption and production. Geosciences, 7(2), 43. https://doi.org/10.3390/geosciences7020043en_US
dc.identifier.urihttps://doi.org/10.3390/geosciences7020043
dc.identifier.urihttp://hdl.handle.net/1828/9953
dc.language.isoenen_US
dc.publisherGeosciencesen_US
dc.subjectcoalen_US
dc.subjectcoalbed methaneen_US
dc.subjectcoal seam gasen_US
dc.subjectcoal seam methaneen_US
dc.subjectshale gasen_US
dc.subjectcanister desorptionen_US
dc.subjectproductionen_US
dc.subjectgas compositionen_US
dc.subjectstable carbon isotopesen_US
dc.subjectstable hydrogen isotopesen_US
dc.subjectgeochemistryen_US
dc.titleStable Isotope Systematics of Coalbed Gas during Desorption and Productionen_US
dc.typeArticleen_US

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