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Modeling of catagenetic transformation of organic matter from a Riphean mudstone in hydrous pyrolysis experiments: Biomarker data

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The catagenesis of organic matter (OM) was modeled by the hydrous pyrolysis of a Riphean mudstone. Microscopic observations of the processes operating during kerogen heating to 600°C were conducted in a diamond anvil cell. The results of pyrolysis in an aqueous environment were used to calculate the activation energies of kerogen cracking and derive chemical kinetic models for OM catagenesis. Isothermal experiments were carried out for 3 days at temperatures of 300, 310, …, 360, and 370°C. The maximum bitumen yield was obtained at 330°C followed by thermal cracking at higher temperatures. The aromatic and saturated hydrocarbons from rock bitumen, hydrous pyrolyzates, and kerogen flash pyrolyzates were analyzed by chromatography-mass spectrometry. We also discuss the problem of extrapolation of high-temperature pyrolysis results to geologic observations under the conditions of regional catagenesis.

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Correspondence to V. N. Melenevskii.

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Original Russian Text © V.N. Melenevskii, 2012, published in Geokhimiya, 2012, Vol. 50, No. 5, pp. 470–482.

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Melenevskii, V.N. Modeling of catagenetic transformation of organic matter from a Riphean mudstone in hydrous pyrolysis experiments: Biomarker data. Geochem. Int. 50, 425–436 (2012). https://doi.org/10.1134/S001670291203007X

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  • DOI: https://doi.org/10.1134/S001670291203007X

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