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

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...

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Bibliographic Details
Published in:Geochemistry international 2012-05, Vol.50 (5), p.425-436
Main Author: Melenevskii, V. N.
Format: Article
Language:English
Subjects:
Aromatic hydrocarbons
Biomarkers
Earth and Environmental Science
Earth Sciences
Geochemistry
High temperature
Kerogen
Mass spectrometry
Organic chemistry
Organic matter
Pyrolysis
Saturated hydrocarbons
Stone
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Summary: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.
ISSN:0016-7029
1556-1968
DOI:10.1134/S001670291203007X