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Microbial origin of Australian coalbed methane
John W. Smith and Robert J. Pallasser
Microbial origin of Australian coalbed methane
AAPG Bulletin (June 1996) 80 (6): 891-897
Microbial origin of Australian coalbed methane
AAPG Bulletin (June 1996) 80 (6): 891-897
Index Terms/Descriptors
- aliphatic hydrocarbons
- alkanes
- Australasia
- Australia
- bituminous coal
- Bowen Basin
- C-13/C-12
- carbon
- carbon dioxide
- coal
- coal seams
- coalbed methane
- D/H
- ethane
- fractionation
- genesis
- hydrocarbons
- hydrogen
- isotope ratios
- isotopes
- mass spectra
- methane
- natural gas
- New South Wales Australia
- organic compounds
- organic residues
- Paleozoic
- Permian
- petroleum
- pyrolysis
- Queensland Australia
- sampling
- sedimentary rocks
- spectra
- stable isotopes
- Sydney Basin
- variations
Latitude & Longitude
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) delta (super 13) C and delta D values for methane of -60 + or -10 per mil PDB and -217 + or -17 per mil SMOW, respectively, (3) carbon dioxide contents of less than 5%, and (4) delta 13'C(CO (sub 2) -CH (sub 4) ) values of 55 + or -10 per mil PDB. These data suggest that microbial reduction of CO (sub 2) rather than traditional thermogenic reactions is mainly responsible for gas composition. Invasions by CO (sub 2) of deep-seated external origins are readily recognized by their isotopic compositions (-7 + or -2 per mil PDB).
ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 80
Serial Issue: 6
Title: Microbial origin of Australian coalbed methane
Affiliation: CSIRO, Division of Petroleum Resources,
North Ryde, N.S.W.,
Australia
Pages: 891-897
Published: 199606
Text Language: English
Publisher: American Association of Petroleum Geologists,
Tulsa, OK,
United States
References: 27
Accession Number: 1996-047029
Categories: Economic geology, geology of energy sourcesIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch map
S37°30'00" - S28°15'00", E141°00'00" - E153°30'00"
S29°00'00" - S10°00'00", E138°00'00" - E153°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 199616
