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Understanding the Late Triassic Mungaroo and Brigadier deltas of the Northern Carnarvon Basin , North West Shelf , Australia
| Content Provider | Semantic Scholar |
|---|---|
| Author | Adamson, Kenneth R. Lang, Simon Christopher Marshall, Norma Guimarães Seggie, R. J. Adamson, Nathan J. Bann, Kerrie L. |
| Copyright Year | 2013 |
| Abstract | This study focuses on the stable carbon (dC) and hydrogen (dD) isotopic compositions of bulk, saturated and aromatic hydrocarbons in 19 Paleozoic marine crude oils from the Canning Basin, Western Australia. The stable carbon isotopic composition of crude oils is primarily dependent upon the source of the organic matter. Comparisons to other Australian and global marine oils and source rocks demonstrate systematic changes in the bulk stable carbon isotopic composition throughout the Paleozoic. From the Early to the Late Paleozoic, Australian oils have become isotopically more enriched in C; however, no such comparable trend is observed in deuterium. The most depleted dCsat value (-32.4‰) is from the saturated hydrocarbon fraction of Middle Cambrian-derived oil-stains in the Arafura Basin, whereas in the Canning Basin the oldest oils are Ordovician with dCsat values of about -31.5‰. Devonian-sourced marine oils from this basin exhibit slightly more enriched values (mean dCsat = -29.3‰), and Mississippian-sourced marine oils from both the Canning and Bonaparte basins have mean dCsat values in the order of -28.2‰. Carbon and hydrogen isotopic compositions of individual C7+ n-alkanes obtained for the three major oil families from the Canning Basin, as determined by combined carbon isotopes and biomarker analyses, corroborate previous findings and emphasise both facies variations and differences in the level of thermal maturation attained by their source rocks. The n-alkane-specific dC isotopic profiles of the Paleozoic marine oils from the Canning and Bonaparte basins characteristically follow the same trend as the bulk dC isotopic values. The n-alkane-specific dD isotopic profiles of the oils typically complement those of the carbon isotopic profiles; however, they show a greater range of values than the carbon isotopic data. The isotopic data have been used to refine the characterisation of oil families and petroleum systems in the Canning Basin. The similarities of the n-alkane-specific dD isotopic profiles of some Ordoviciansourced Canning Basin oils with those of Early Triassic-sourced oils of the Perth Basin demonstrates that the typing of oil families should not be undertaken exclusively on a single parameter. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.conference.iceaustralia.com/wabs13/pdf/WABS_Abstracts.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
