Introduction to the petrology and infrared spectra of Shanxi coals, People's Republic of China

Huai, Huaying; Gaines, Alec F.; Scott, Andrew C.

doi:10.1016/0016-2361(94)90308-5

Cited by 13 publications

(1 citation statement)

References 25 publications

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“…5. Apart from the baseline shift, the most prominent differences are in the region 900-700 cm-I, where the aromatic out-of-plane C-H vibrations can be observed (Brown, 1955;Painter et al, 1981;Huai et al, 1994). Four peaks can easily be identified in this region (Fig.…”

Section: Resultsmentioning

confidence: 95%

Reflectance Retardation (Suppression) and Source Rock Properties Related to Hydrogen‐enriched Vitrinite in Middle Jurassic Coals, Danish North Sea

Petersen

Rosenberg

1998

Journal of Petroleum Geology

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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.

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Section: Resultsmentioning

confidence: 95%