Computer Science
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..649s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 5, pp.649-661
Computer Science
36
Scientific paper
The deuterium concentrations ( D vs SMOW) of biogenic methanes from world-wide occurrences range from -180 to -280%. and were found to be depleted in deuterium by approx. 160%. compared to the deuterium concentration of their associated waters. Theoretical considerations support this relationship to be the result of bacterial transformation of CO 2 to methane and is therefore indicative of the biogenic origin of methane. Thermogenic gases with high C 2+ concentrations (wet gases associated with crude oil) have D/H ratios from -260 to -150%. with deuterium contents tending to increase with decreasing wetness. Dry gases which are not associated with petroleum are more enriched in deuterium (-180 to -130%.) and show an increase in deuterium with increasing rank of the source beds as it is similarly known for carbon-13. Many dry gases in young sedimentary basins were found to contain significant amounts of C 2+ hydrocarbons. These gases cannot be grouped with either the biogenic or thermogenic gases and their methane is concluded to be of mixed biogenic and thermochemical origin. Using a 13 C / D diagrammatic display of the isotope data of methanes the various genetic groups of natural gases can be defined more clearly.
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