Relation of the methylated aromatic hydrocarbon distribution pattern to the maturity of organic matter in ancient sediments from the Mahakam delta

Details Relation of the methylated aromatic hydrocarbon distribution pattern to the maturity of organic matter in ancient sediments from the Mahakam delta Relation of the methylated aromatic hydrocarbon distribution pattern to the maturity of organic matter in ancient sediments from the Mahakam delta

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..375g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 2, pp.375-384

Computer Science

1

Scientific paper

The distribution of methyl-phenanthrenes, -anthracenes, -chrysenes and -pyrenes in twelve immature coal samples from the Mahakam delta (Indonesia) have been examined by capillary gas chromatography (CGC) and high resolution Shpol'skii spectroscopy (HRS). Gradual changes with increasing depth have been observed for several compound ratios which have been calculated from the relative distributions of the methyl aromatics in each family. A general decrease was observed in the relative proportion of -substituted compounds (less thermodynamically stable compounds) versus the -substituted compounds (most thermodynamically stable compounds). These changes reflect the increasing thermal maturation of the sedimentary organic matter which could not be revealed from immature and marginally mature rock samples by vitrinite reflectance data. New maturation indices based on methyl-anthracenes, -chrysenes and -pyrenes are presented and their application to the studied samples is discussed.

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