Sulphur and oxygen sequestration of n -C 37 and n -C 38 unsaturated ketones in an immature kerogen and the release of their carbon skeletons during early stages of thermal maturation

Details Sulphur and oxygen sequestration of n -C 37 and n -C 38 unsaturated ketones in an immature kerogen and the release of their carbon skeletons during early stages of thermal maturation Sulphur and oxygen sequestration of n -C 37 and n -C 38 unsaturated ketones in an immature kerogen and the release of their carbon skeletons during early stages of thermal maturation

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.2397k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 61, Issue 12, pp.2397-2408

Physics

1

Scientific paper

Sedimentary rock from the Gessoso-solfifera Formation (Messinian) in the Vena del Gesso Basin (northern Italy) containing immature ( R o = 0.25%) S-rich organic matter was artificially matured by hydrous pyrolysis at temperatures from 160 to 330°C for 72 h to study the diagenetic fate of n -C 37 and n -C 38 di- and tri-unsaturated methyl and ethyl ketones (alkenones) biosynthesised by several prymnesiophyte algae. During early diagenesis, the alkenones are incorporated into the kerogen by both sulphur and oxygen cross-linking as indicated by chemical degradation experiments with the kerogen of the unheated sample. Heating at temperatures between 160 and 260°C, which still represents early stages of thermal maturation, produces large amounts (up to 1 mg/g TOC) of S-bound, O-bound, and both S- and O-bound n -C 37 and n -C 38 skeletons, saturated n -C 37 and n -C38 methyl, ethyl, and mid-chain ketones, C 37 and C 38 mid-chain 2,5-di- n -alkylthiophenes, C 37 and C 38 1,2-di- n -alkylbenzenes, and C 37 and C 38 n -alkanes. With increasing thermal maturation, three forms of the n -C 37 and n -C 38 skeletons are relatively stable (saturated hydrocarbons, 1,2-di- n -alkylbenzenes and saturated ketones), whereas the S- and O-bound skeletons are relatively labile. These results suggest that in natural situations saturated ketones with an n -C 37 and n -C 38 skeleton can be expected as well as the corresponding hydrocarbons.

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