On the chemical mechanism of kerogen thermal transformation. Study of the transformation of sporopollenin |
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| Authors: | MA Bestougeff RJ Byramjee B Pesneau |
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| Institution: | TOTAL-Compagnie Francaise des Pétroles, 39-43 Quai Andre Citroen, 75739 Paris Cedex 15, France |
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| Abstract: | Experiments were carried out on the thermal decomposition of sporopollenin, isolated from a marine algae (Lycopodium clavatum) at constant temperature (380°C) and pressure (around 200 atm), but for varying pyrolysis times.The decomposition products were separated into groups, analysed by chromatography and infra-red spectroscopy, and their elemental composition determined. The thermal evolution of sporopollenin proceeds in three distinct steps: first, a partial decomposition of the initial substance occurs with the formation of soluble materials. This is followed by a full decomposition of the sporopollenin and disappearance of the non-soluble residue. Finally, a non-soluble material reappears. It is proposed that, due to secondary reactions, the evolution of kerogen of the sapropelic type is similar to what has been observed in mild pyrolysis experiments. |
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| Keywords: | kerogen sporopollenin pyrolysis thermal decomposition source-rock Van Krevelen diagram |
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