Results 161 to 170 of about 8,930 (209)

Chemical Composition of Shale Kerogen (Kerogen-70) from Leningrad Oblast

Russian Journal of Applied Chemistry, 2001
The chemical composition of various extracts from oil shale (kerogen-70) was studied in detail.
V. V. Platonov, V. A. Proskuryakov, I. L. Novikova, O. A. Shavyrina, A. V. Glybina   +4 more
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Effect of the Kerogen Molecular Structure on the Formation of Methane During Kerogen Pyrolysis

Australian Journal of Chemistry, 2018
In this study, density functional theory (DFT) at the GGA/RPBE level was employed to examine the effects of the kerogen microstructure on the formation mechanism of methane during the pyrolysis of kerogen. The calculations prove that the evolution of CH4 during kerogen pyrolysis corresponds to demethylation, and the process of forming methane involves ...
Qing Wang, Xinmin Wang, Shuo Pan
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Kerogen based characterization of major gas shales: Effects of kerogen fractionation

Organic Geochemistry, 2015
Abstract Research into the origin and the mode of entrapment and expulsion of natural gas from unconventional plays requires the isolation and separation of kerogen in its purest and most intact form from the rock matrix. This study expands on the comparative analysis of the effects that isolation methods, conservative closed system versus ...
Denet Pernia, K.K. (Adry) Bissada, Joseph Curiale   +2 more
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Diagenetic modification of kerogens

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1985
Abstract Kerogen is the part of sedimentary organic matter that is not petroleum. It can be isolated by using acid destruction of minerals, except in recent sediments where this procedure results in important hydrolysis reactions. Whether the scale of observation is microscopic or molecular, kerogens are heterogeneous mixtures whose ...
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From Kerogen to Petroleum

1978
As sedimentation and subsidence continue, temperature and pressure increase. In this changing physical environment, the structure of the immature kerogen is no longer in equilibrium with its surroundings. Rearrangements will progressively take place to reach a higher, and thus more stable, degree of ordering.
Bernard P. Tissot, Dietrich H. Welte
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A reappraisal of kerogen formation

Geochimica et Cosmochimica Acta, 1989
Abstract Comparative microscopical and chemical studies of recognizable entities in kerogen and their extant counterparts suggest a new and simple mechanism of kerogen formation which clarifies the interrelationships between extant biomass, kerogen, and fossil fuels.
E.W Tegelaar, J.W de Leeuw, S Derenne, C Largeau   +3 more
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On the mechanism of kerogen pyrolysis

Fuel, 1984
Abstract Aromaticities determined by 13 C n.m.r. are reported for five shale oil samples (Green River formation) prepared under widely different pyrolysis conditions. In the absence of high-pressure hydrogen, the total amount of aromatic carbon in the products is nearly twice that in the raw shale.
Alan K. Burnham, James A. Happe
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Primary migration by diffusion through kerogen: II. Hydrocarbon diffusivities in kerogen

Geochimica et Cosmochimica Acta, 1990
Abstract Laboratory experiments were performed to assess diffusion through kerogen as a mechanism of liquid hydrocarbon transport through fine-grained rocks. Such transport can be important in primary migration within source rocks and in leakage through seals. Previous work with organic-coated model cores has shown that hydrocarbon diffusion through
Michele Moisio Thomas, Jamie A. Clouse
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Chemical modelling of kerogens

Organic Geochemistry, 1987
Abstract Models of kerogens belonging to the three classical Types have been represented at the following evolution stages: • -beginning of diagenesis (sensu-stricto), • -beginning of catagenesis, • -end of catagenesis. Chemical models are drawn, using analytical data obtained on natural samples: elemental analysis, electron ...
F. Behar, M. Vandenbroucke
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Kerogen: Composition and Classification

1978
The term kerogen will be used here to designate the organic constituent of the sedimentary rocks that is neither soluble in aqueous alkaline solvents nor in the common organic solvents. This is the most frequent acceptance of the term kerogen, and results from a direct generalization to other rock types of the definition by Breger (1961) in ...
Bernard P. Tissot, Dietrich H. Welte
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