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- W2079737039 abstract "Middle Jurassic high volatile bituminous A coals from the Danish North Sea may yield vitrinite reflectance values retarded by 0.10–0.14 %Rr The coals are low in liptinite content, and the reflectance retardation is related to the vitrinite composition. Vitrain (assumed to be pure vitrinite) was hand-picked from eight samples and characterised by means of element analysis, Fourier Transform infrared spectroscopy and Rock-Eval pyrolysis. In contrast to the vitrinite from samples yielding “true” reflectance values, the vitrinite from three of the samples yielding retarded reflectances is perhydrous in nature (5.57–5.79 wt-% (d.a.f.) H) and has H/C atomic ratios of 0.80–0.83. Vitrinite from another reflectance-retarded sample is enriched in sulphur. The hydrogen enrichment is inherited from oxygen-deficient, waterlogged and marine-influenced conditions in the precursor mires. FTIR spectra demonstrate that the perhydrous vitrinites have a lower aromaticity as measured by aromatic hydrogen vibrations in the region 900–700 cm-1 compared to the “normal” vitrinites. This suggests a reduced maturation rate of the hydrogen-enriched vitrinite. S1(Vitr), S2(vitr) and HIvitr values from the vitrinite concentrates indicate that the vitrinite is a significant contributor to the overall generative potential; this is particularly the case for the perhydrous vitrinite. Activation energies for the vitrinites are centred at 260 and 268 kJ/mole. It is not possible to detect a measurable difference in Ea between the perhydrous and “normal” vitrinites. This may suggest more-or-less similar generation characteristics, or it may indicate that Rock-Eval kinetics do not replicate Nature in this regard." @default.
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- W2079737039 date "1998-07-01" @default.
- W2079737039 modified "2023-10-18" @default.
- W2079737039 title "REFLECTANCE RETARDATION (SUPPRESSION) AND SOURCE ROCK PROPERTIES RELATED TO HYDROGEN-ENRICHED VITRINITE IN MIDDLE JURASSIC COALS, DANISH NORTH SEA" @default.
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- W2079737039 doi "https://doi.org/10.1111/j.1747-5457.1998.tb00781.x" @default.
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