Show simple item record Strapoc, Dariusz Schimmelmann, Arndt Mastalerz, Maria Eble, Cortland 2007-01-12T21:12:27Z 2007-01-12T21:12:27Z 2007-01-12T21:12:27Z
dc.description Presented at the American Association of Petroleum Geologists International Conference and Exhibition, November 5-8, 2006, Perth, West Australia. en
dc.description.abstract Coalbed gases and waters from exploratory and production gas wells in the southeastern Illinois Basin were sampled to geochemically assess the origin of coalbed gases, with emphasis on Springfield and Seelyville coal members that are commercially targeted for coalbed methane production. On-line analyses of hydrocarbon gases (methane to butanes: C1, C2, C3, n-C4, i-C4) and CO2 yielded chemical concentrations, Delta-D, and Delta 13C values. The low thermal maturity of Indiana coals (vitrinite reflectance Ro ~ 0.6%) is in agreement with an overwhelmingly biogenic isotopic signature of coalbed gas that has greater than or equal to 96% methane generated via bacterial CO2-reduction. In contrast, thermogenic coalbed gas was generated by the stratigraphically equivalent coalbeds in western Kentucky’s Rough Creek Graben zone where higher maturities of up to Ro ~ 0.8% are reached due to tectonic and hydrothermal activity. No secondary biogenic methane was observed in Kentucky coalbed gases, probably due to greater burial depths and limited recharge of meteoric water. The two differently sourced types of coalbed gases are compositionally and isotopically distinct. Microbial biodegradation of thermogenic C2+ hydrocarbon gases in Indiana coalbeds preferentially targets C3 and introduces isotope fractionation whereby remaining C3 is enriched in heavy hydrogen and carbon isotopes. en
dc.description.sponsorship Supported by U.S. Department of Energy, Basic Energy Research Grant DEFG02-00ER15032 en
dc.format.extent 3231803 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.rights This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. To view a copy of this license, visit or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA. en
dc.rights.uri en
dc.subject Coalbed Gas en
dc.subject Coalbed Methane en
dc.subject Geochemistry en
dc.subject Thermal Maturity en
dc.subject C-13 en
dc.subject Springfield Coal en
dc.subject Seelyville Coal en
dc.subject Pennsylvanian en
dc.subject Illinois Basin en
dc.subject Indiana en
dc.subject Kentucky en
dc.title Compound Specific Carbon and Hydrogen Stable Isotope Ratios of Coalbed Gases in Southeastern Illinois Basin en
dc.type Presentation en

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