Tmax of asphaltenes: a parameter for oil maturity assessment |
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| Authors: | M Nali G Caccialanza C Ghiselli M A Chiaramonte |
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| Institution: | Eni-Agip Division, Geochemical Department, Via Maritano 26, 20097 San Donato Milanese, Italy |
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| Abstract: | A new maturity parameter determined on both oil and bitumen samples, the asphaltene Tmax, is proposed and discussed. This parameter could be very useful to address the maturity of the source rock. The asphaltene Tmax is measured by programmed Rock-Eval pyrolysis, using a modified temperature program. Some phases of the experimental procedure, such as the asphaltene preparation and the Rock-Eval measurement substratum choice, are crucial in order to achieve reliable data. Laboratory simulations were carried out in order to assess the possible effects of both primary and secondary migration on asphaltene Tmaxin the expelled oil: the original value of the asphaltene Tmax in the bitumen is not substantially modified and it is very close to that measured on kerogen. Examples of the determination of asphaltene Tmax on many samples, collected from different areas and with different organic matter composition, are given. Results show that Tmax values from oil asphaltenes are reasonable indicators of source rock maturity. |
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| Keywords: | Source rock Kerogen Bitumen Oil Asphaltenes Tmax Maturity Rock-Eval pyrolysis |
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