Abstract
Three series of sediments containing land plant-derived organic matter were studied. They include wells from Mahakam delta, Indonesia (Miocene), Douala basin, Cameroon (Upper Cretaceous) and eastern Paris basin, France (Paleozoic). All of the kerogens and coals isolated from these series can be related to type III in a Van Krevelen diagram, however they obviously differ in terms of chemical structure as reflected by their pyrolysis-GC patterns, and by their bitumen composition. These observations indicate the variations in the nature of land plant-derived sedimentary organic matter and thus differences in quantity and composition of the hydrocarbons which are are released upon maturation. Based on hydrocarbons potential of the insoluble organic matter and on pyrolysis-GC, there is no reason to disregard coals and to favor shales as potential source rocks in these two deltaic sequences. Moreover we assume that the bitumen depletion in coal samples is a reflection of loss by migration which is favored in coals when compared to shales. The GC patterns of the residual saturates, compared to the pyrolysis-GC patterns of the related insoluble coals suggest that migration of hydrocarbons proceeds in these coals without any significant alteration of their distribution, at least in the C 15+ range.
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