Steranes and triterpanes generated from kerogen pyrolysis in the absence and presence of minerals

Details Steranes and triterpanes generated from kerogen pyrolysis in the absence and presence of minerals Steranes and triterpanes generated from kerogen pyrolysis in the absence and presence of minerals

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..805t&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, May 1986, p. 805-812.

Physics

4

Isomerization, Kerogen, Mineralogy, Pyrolysis, Crude Oil, Illite, Montmorillonite, Sediments, Time Response

Scientific paper

Changes 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.

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