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Steranes and triterpanes generated from kerogen pyrolysis in the absence and presence of mineralsChanges in the degree of isomerization of steranes and triterpanes during kerogen pyrolysis in the absence or presence of minerals are described. Kerogen from a Monterey Formation diatomite core sample was pyrolyzed under reduced pressure at 300 C for 2-1000 hrs in the presence or absence of calcite, illite, and montmorillonite. It is observed that the extent of isomerization of biomakers in C-20 in 14 alpha(H), 17 alpha(H)-steranes, at C-22 in 17 alpha(H), 21 beta(H)-hopanes and of 17 beta(H), 21 beta(H)-hopanes correlates to early diagenetic stages in rock extracts from sedimentary basins, and faster isomerization for steranes and triterpanes in the bitumen then for those in the kerogen structure are detected. The effects of the minerals on the isomerization reactions are examined; calcite inhibits, and illite and montmorillonite catalyze the reactions.
Document ID
19860059497
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tannenbaum, E.
(California Univ. Los Angeles, CA, United States)
Ruth, E.
(California Univ. Los Angeles, CA, United States)
Kaplan, I. R.
(California, University Los Angeles, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1986
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 50
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
86A44235
Funding Number(s)
CONTRACT_GRANT: NGR-05-007-221
Distribution Limits
Public
Copyright
Other

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