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Aromatic Hydrocarbons Distribution in Nigerian Coal and Their Geochemical Significance

2010; Taylor & Francis; Volume: 33; Issue: 2 Linguagem: Inglês

10.1080/15567030902937200

1556-7230

T. A. Adedosu, Oluwadayo O. Sonibare, Jincai Tuo, Olusegun Ekundayo,

Coal Properties and Utilization

Abstract Abstract Aromatic fractions obtained from thirteen Nigerian coals collected from two formations (Awgu and Mamu) were analyzed by gas chromatography-mass spectrometry. C1-C3 naphthalene, C0-C2 phenanthrene, and C0-C2 dibenzothiophene are the major aromatic hydrocarbons identified in the coals. 1,6-, 1,7-, and 2,6-DMNs are more pronounced in Mamu Formation compared to Awgu samples, suggesting more terrestrial organic matter input. The presence of 1,2,5- and 1,2,7-TMN in all the samples indicates both angiosperm and gymnosperm contribution to their organic matter. Also, there is occurrence of 1,2,6-TMN in the samples, reflecting microbial input. Paleoenvironmental parameters computed from the phenanthrene and dibenzothiophene and their alkyl derivatives show that the organic matter was deposited in lacustrine and/or fluvio-deltaic environment. Various maturity ratios calculated indicate that the Awgu samples are in the late oil window while Mamu samples are at the beginning of the oil window. The calculated vitrinite reflectance values from the aromatic distributions are in close agreement with vitrinite reflectance values obtained from petrographic analysis. Keywords: coaldepositional environmentgas chromatography-mass spectrometrypetrographic analysispolyaromatic hydrocarbons