Heating rate effects on aromatic maturity indicators |
| |
| Authors: | R Alexander MG Strachan RI Kagi W Van Bronswijk |
| |
| Abstract: | Aromatic maturity indicators based upon dimethylnaphthalenes, trimethylnaphthalenes and methylphenanthrenes have been determined for two sedimentary sequences from northwest Western Australia. The rate of change of these indicators with depth has been modelled using a kinetic expression which accounts for the effects of continuously varying time and temperature. Activation energies and entropies of activation have been measured. Maturity indicators with similar and with very different kinetic parameters have been used to construct plots to illustrate their behaviours under a variety of thermal regimes. Maturity indicators with similar activation energies behave almost identically over a wide range of heating rates while those with substantial differences display more diverse behaviour. The former may be used to relate kerogen-based maturity indicators with those determined from crude oils, whereas the latter can provide information about the maximum palaeotemperatures and heating rates of sedimentary hydrocarbons. It was also observed that the kinetic parameters for particular aromatic maturity indicators differed between the two sedimentary sequences, suggesting that source and mineral matrix effects can influence their behaviour. |
| |
| Keywords: | aromatic maturity indicators heating rate kinetics dimethylnaphthalenes trimethylnaphthalenes methylphenanthrenes |
| 本文献已被 ScienceDirect 等数据库收录！ |
