GC-{sup 13}C IRMS characterisation of extractable and covalently bound alkanes in petroleum source rocks to reveal compositional fractionation effects
- Univ. of Strathclyde, Glasgow (United Kingdom)
- SURRC, Glasgow (United Kingdom)
The application of a sequential extraction/degradation scheme to differentiate between molecular alkanes (both easily extractable and physically-trapped) and covalently-bound alkyl moieties to a number of vitrinite concentrates and petroleum source rocks has been reported previously. Gas chromatography-isotope ratio mass spectrometry GC-s{sup 13}C IRMS has now been applied to the different awe fractions to probe compositional fractionation effects that might occur from the different initial biological inputs. For a Turkish oil shale (Goynuk - Type I kerogen), inputs from diverse sources, including phytoplanktron, higher plants and bacteria were implied from analysis of solvent-extractable alkanes. However, the much larger quantities of covalently-bound alkanes had an isotopic signature typical of eukarytoic (freshwater) algae. The isotopic uniformity of alkanes/alkenes released from sequential hydropyrolysis of a torbanite (Duunet shale) confirmed that this sample was largely derived from the selective preservation of resistant aliphatic biopolymers found in Botryococcus cell walls.
- OSTI ID:
- 214704
- Report Number(s):
- CONF-950801-; TRN: 96:000922-0175
- Resource Relation:
- Conference: 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of 210th ACS national meeting. Part 1 and 2; PB: 1866 p.
- Country of Publication:
- United States
- Language:
- English
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