Extended 3 beta-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts

Details Extended 3 beta-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts Extended 3 beta-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.3717d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 18, pp.3717-3729

Computer Science

Scientific paper

In oils and Precambrian- to Miocene-age source rocks from varying depositional environments, we have conclusively identified several novel 3-alkyl sterane and triaromatic steroid series, including (1) 3 - n -pentyl steranes, (2) 3 -isopentyl steranes, (3) 3 - n -hexyl steranes, (4) 3 - n -heptyl steranes, (5) 3,4-dimethyl steranes, (6) 3 -butyl,4-methyl steranes, (7) triaromatic 3- n -pentyl steroids, and (8) triaromatic 3-isopentyl steroids. We have also tentatively identified additional homologs with 3-alkyl substituents as large as C 11 . The relative abundances of these compounds vary substantially between samples, as indicated by (1) the ratio of 3 - n -pentyl steranes to 3 -isopentyl steranes and (2) the ratio of 3- n -pentyl triaromatic steroids to 3-isopentyl triaromatic steroids. These data suggest possible utility for these parameters as tools for oil-source rock correlations and reconstruction of depositional environments. Although no 3-alkyl steroid natural products are currently known, several lines of evidence suggest that 3 -alkyl steroids result from bacterial side-chain additions to diagenetic 2 -sterenes.

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