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Open AccessArticle

Characteristics of Microbial Coalbed Gas during Production; Example from Pennsylvanian Coals in Indiana, USA

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Indiana Geological Survey, Indiana University, 611 N. Walnut Grove Avenue, Bloomington, IN 47405, USA
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Department of Earth and Atmospheric Sciences, Indiana University, 1001 E. 10th Street, Bloomington, IN 47405, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Alexei V. Milkov, Giuseppe Etiope and Jesús Martínez Frías
Geosciences 2017, 7(2), 26; https://doi.org/10.3390/geosciences7020026
Received: 21 February 2017 / Revised: 31 March 2017 / Accepted: 10 April 2017 / Published: 13 April 2017
(This article belongs to the Special Issue Natural Gas Origin, Migration, Alteration and Seepage)
Coalbed gases from 11 wells producing from the Springfield and Seelyville Coal Members (Pennsylvanian) were analyzed for composition and carbon and hydrogen stable isotope ratios in four sampling events to investigate short-term variation trends. Nine wells in the Seelyville Coal Member produce coalbed gases from the virgin seam, whereas two wells in the Springfield Coal Member produce gas from mine voids. Methane dominates gas composition in all wells, and its content ranges from ~94% to almost 98%, with ethane typically accounting for less than 0.01%. Carbon dioxide content in most samples is below 1%, whereas N2 content ranges from less than 2% to 4.8%. Methane δ13C values range from −55.3‰ to −61.1‰, and δ2H values range from −201‰ to −219‰. Isotopic values of methane and C1/(C2 + C3) ratios indicate a biogenic origin along the CO2-reduction pathway, consistent with previous studies in this area. Our results demonstrate that gas properties may change significantly during a period of one year of production history. Compositional trends (e.g., C1/(C2 + C3), CH4/CO2 ratios) are specific for each well and often irregular. These changes result from a combined influence of numerous factors and, therefore, are difficult to predict. View Full-Text
Keywords: coalbed methane; gas composition; carbon isotopes; hydrogen isotopes; Illinois Basin coalbed methane; gas composition; carbon isotopes; hydrogen isotopes; Illinois Basin
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MDPI and ACS Style

Mastalerz, M.; Drobniak, A.; Schimmelmann, A. Characteristics of Microbial Coalbed Gas during Production; Example from Pennsylvanian Coals in Indiana, USA. Geosciences 2017, 7, 26.

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