Bitumen from Coalport tar tunnel |
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| Authors: | Borys M Didyk Bernd RT Simoneit G Eglinton |
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| Institution: | 1. Refinería de Petróleo S.A., Empresa Nacional del Petróleo, Casilla 242, Concon, Chile;2. School of Oceanography, Oregon State University, Corvallis, OR 97331, U.S.A.;3. School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K. |
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| Abstract: | The Coalport (Shropshire, U.K.) Tar Tunnel bitumen has been known since 1787 and the first geochemical data are reported here. The bitumen was analyzed for molecular markers useful for correlational studies. Gas chromatographic analysis of aliphatic and aromatic hydrocarbons failed to detect any specific major components normally used for genetic correlational and maturational studies. A search for minor and trace components by gas chromatographic-mass fragmentographic analysis showed the presence of triterpenoid hydrocarbons primarily of the 17α (H)-hopane series (C27 to C35, ex. C28) and a C26 to C31 series of ring A/B demethylated hopanes. Two homologous sterane series (C27 to C29) of the 5α, 14β, 17β (H)-sterane and 13β, 17α (H)-diasterane type were also detected. Pophyrins of the DPEP and etio series (C27 to C41, DPEP/etio > 1) were also found. Characterization of their alkyl substitution pattern demonstrated C1, C2 and C3 substituents on the pyrole moieties of the parent petroporphyrins.The molecular markers detected in this bitumen indicate its biogenic origin and show evidence of diagenetic and geothermal maturation processes. The overall geochemical characteristics of the Coalport Tar Tunnel bitumen suggest that it corresponds to a well matured crude oil, which was heavily altered by in-reservoir biodegradation or close to surface exposure. |
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| Keywords: | Author to whom correspondence should be addressed |
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