Abstract

To obtain a complete maturation set of strictly same precursor, an oil-prone tertiary coal from the Mahakam delta (Indonesia) is submitted to artificial maturation using confined pyrolysis. The analysis of the co-genetic phases (free hydrocarbons, resins, asphaltenes, and residual kerogen) reveals the composition and evolution of each fraction. It appears that the polars have a high oil potential and contribute significantly to the generation of hydrocarbons (up to 25% of the initial oil potential, and up to 50% at given maturation stages). During the main stage of bitumen generation, a great part of the initial oil potential is thus transferred to the polars. During the later stages of thermal breakdown, this potential is released and contributes to the generation of aliphatics. In addition to their contribution as hydrocarbon source, the polars of the Mahakam coal contain a significant amount of Dammar resin. This latter is revealed to be a source of hydronaphthalenics which are very efficient hydrogen ...

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