Add time:07/20/2019         Source:sciencedirect.com

The distributions of trimethyldibenzothiophenes (TMDBTs), the relationship between TMDBTs and trimethylbiphenyls (TMBPs) and the application of TMDBTs as maturity indicators have been investigated in a set of lacustrine shales from the Eocene Shahejie Formation in the Liaohe Basin, East China. The 3,5,3′-, 3,5,4′- and 3,4,4′-TMBP isomers can react to yield (2,4,6- + 2,4,8)-TMDBT, 2,4,7-TMDBT, and (3,4,7 + 2,3,7)-TMDBT by incorporating a sulfur atom into biphenyl, respectively. The absolute concentrations of (2,4,6 + 2,4,7 + 2,4,8)-TMDBT increase with those of (3,5,3′ + 3,5,4′)-TMBP. Similarly, the absolute concentrations of (3,4,7- + 2,3,7)-TMDBT show a similar increase with those of 3,4,4′-TMBP. The good straight line relationships (R2 = 0.96) indicate the product–precursor links between TMDBTs and TMBPs in the sediments. On the basis of the possible differences in the thermodynamic stability among TMDBT isomers, a new maturity indicator 2,4,6-/(2,4,7 + 2,4,8)-TMDBT ratio is proposed in this study. This ratio has a good correlation with 4-/1-methyldibenzothiophen ratio (MDR) and Tmax (°C), respectively, indicating similar behavior with increasing maturity. Both of the 2,4,6-/(2,4,7 + 2,4,8)-TMDBT ratio and MDR exhibit similar maturation trends. They gradually decrease with increasing maturity at the low maturity stages, and then are followed by a regular increase with the increasing maturity. Therefore, this ratio is an effective maturity indicator for source rocks and an oils maturity assessment (Ro > ≈0.55%), and it must be applied with caution as a maturity indicator for extracts of immature sediments.

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