Flash pyrolysis of kerogens from algal rich oil shales from the Eocene Huadian Formation, NE China
|Zhang, Z. and Volkman, J. and Greenwood, P. and Hu, W. and Qin, J. and Borjigin, T. and Zhai, C. et al. 2014. Flash pyrolysis of kerogens from algal rich oil shales from the Eocene Huadian Formation, NE China. Organic Geochemistry. 76: pp. 167-172.
The hydrocarbon composition of the kerogen fractions of two samples (HD-20 and HD-21) from oil shale layer 4 in the Eocene Huadian Formation, NE China were investigated by analytical flash pyrolysis (650 C/10 s) followed by gas chromatography–mass spectrometry (Py–GC–MS). Organic petrography showed that the two kerogens were almost entirely derived from algal remains but contained very different algal maceral compositions, with 40% of the macerals in HD-20 being of macroalgal origin that were not present in HD-21. Py–GC–MS yielded high concentrations of n-alkanes from both kerogens, but with different molecular weight profiles due to the different algal contributors to the two kerogen samples. The hydrocarbon pyrolysates generated at 650 C from HD-21 in which the green microalga Botryococcus braunii was identified showed a higher proportion of longer chain alkanes and alkenes presumably from cracking of the botryococcus algaenan. We also identified a C40 monoaromatic lycopane derivative, which was absent in the HD-20. The high hydrocarbon potential of both kerogens can be attributed to common microalgal sources, whereas the macroalgae, which is abundant in HD-20, makes only a minor contribution to the hydrocarbon products.
|Huadian oil shale
|Aromatic lycopane derivative
|Flash pyrolysis of kerogens from algal rich oil shales from the Eocene Huadian Formation, NE China
|Department of Applied Chemistry
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