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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

Volume: 80 (1996)

Issue: 6. (June)

First Page: 891

Last Page: 897

Title: Microbial Origin of Australian Coalbed Methane

Author(s): John W. Smith (2), Robert J. Pallasser (2)

Abstract:

Bituminous coal seam gases from the Permian Sydney and Bowen basins, Australia, are characterized by (1) methane/ethane ratios greater than or equal to 1000, (2) ^dgr13C and ^dgrD values for methane of -60 ±10^pmil PDB and -217 ±17^pmil SMOW, respectively, (3) carbon dioxide contents of less than 5%, and (4) ^dgr13C(CO<2-CH4) values of 55 ±10^pmil PDB. These data suggest that microbial reduction of CO2 rather than traditional thermogenic reactions is mainly responsible for gas composition. Invasions by CO2 of deep-seated external origins are readily recognized by their isotopic compositions (-7 ±2^pmil PDB).

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