Elaboration of a new compositional kinetic schema for oil cracking

A tentative global kinetic model for the total C14+ oil was elaborated which well simulated laboratory experiments for both global conversions and yields of generated products. When this model is used for extrapolating laboratory results to natural reservoirs assuming a geothermal heating rate of 2 °C/Ma, predicted oil thermal behavior is not in contradiction with observed field data. Indeed, aromaticity is decreasing above 140 °C whereas, the yield of C14+ saturates starts to decrease above 170-180 °C. However this comparison is only qualitative since this model was not integrated into a real case study in which the full process of generation-expulsion and oil cracking must be totally described. The reverse relative thermal stability of the C14+ saturates and aromatics between laboratory and geological conditions is explained by the large difference of A and E of the two chemical classes. Finally, this model was elaborated on a Type II oil only and needs to be tested also on other oils of different chemical composition, either paraffinic or enriched in NSOs.