Comparison between natural and artificial maturation series of humic coals from the Mahakam delta,Indonesia |
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Authors: | Marc Monthioux Patrick Landais Jean-Claude Monin |
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Affiliation: | 1. Centre National de la Recherche Scientifique, 15 Quai Anatole France, 75700 Paris, France;2. Centre de Recherches sur la Géologie de l''Uranium, BP 23, 54501 Vandoeuvre les Nancy Cedex, France;3. Institut Français du Pétrole, BP 311, 92506 Rueil-Malmaison Cedex, France |
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Abstract: | Type III (humic) organic matter from the Mahakam delta (Indonesia) was chosen to compare artificial and natural coal series. Powdered and concentrated immature organic matter was heated in sealed gold tubes for 24 hr at temperatures ranging from 250 to 550°C and under pressures ranging from 0.5 to 4 kb, with and without water. Both elemental and Rock-Eval analyses were used to characterize the products. A comparison between our results, published data and the natural model shows that, quantitatively, natural maturation is simulated better when pyrolysis is performed under confined conditions (no free volume, no diluting inert gas). Thus, pyrolysis in a medium swept by an inert gas, vacuum pyrolysis and some pyrolysis in sealed glass tubes must be considered to be poor simulation tools. The presence of water does not seem to have an essential effect. Allowing the hydrocarbons formed to reach a certain value of partial pressure seems to be important. Results are unchanged when external pressure varies from 0.5 to 4 kb. |
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Keywords: | humic coals simulation maturation confinement pressure water |
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