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Title: Extended 3{beta}-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts

Abstract

In oils and Precambian- 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{beta}-n-pentyl steranes, (2) 3{beta}-isopentyl steranes, (3) 3{beta}-n-hexyl steranes, (4) 3{beta}-n-hepatyl steranes, (5) 3,4-dimethyl steranes, (6) 3{beta}-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{sub 11}. The relative abundances of these compounds vary substantially between samples, as indicated by (1) the ratio of 3{beta}-n-pentyl steranes to 3{beta}-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{beta}-alkyl steroids result from bacterial side-chain additions to diagenetic {delta}{sup 2}-sterenes.

Authors:
 [1];  [2];  [3]
  1. Chevron Overseas Petroleum, Inc., San Ramon, CA (United States)|[Stanford Univ., CA (United States)
  2. Stanford Univ., CA (United States)
  3. Australian Geological Survey Organization, Canberra City (Australia) [and others
Publication Date:
OSTI Identifier:
150512
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geochimica et Cosmochimica Acta; Journal Volume: 59; Journal Issue: 18; Other Information: PBD: Sep 1995
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; PETROLEUM; GEOCHEMISTRY; ORIGIN; QUANTITATIVE CHEMICAL ANALYSIS; RESERVOIR ROCK; GEOLOGIC MODELS; STEROIDS

Citation Formats

Dahl, J., Moldowan, J.M., and Summons, R.E. Extended 3{beta}-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts. United States: N. p., 1995. Web. doi:10.1016/0016-7037(95)00271-Z.
Dahl, J., Moldowan, J.M., & Summons, R.E. Extended 3{beta}-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts. United States. doi:10.1016/0016-7037(95)00271-Z.
Dahl, J., Moldowan, J.M., and Summons, R.E. Fri . "Extended 3{beta}-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts". United States. doi:10.1016/0016-7037(95)00271-Z.
@article{osti_150512,
title = {Extended 3{beta}-alkyl steranes and 3-alkyl triaromatic steroids in crude oils and rock extracts},
author = {Dahl, J. and Moldowan, J.M. and Summons, R.E.},
abstractNote = {In oils and Precambian- 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{beta}-n-pentyl steranes, (2) 3{beta}-isopentyl steranes, (3) 3{beta}-n-hexyl steranes, (4) 3{beta}-n-hepatyl steranes, (5) 3,4-dimethyl steranes, (6) 3{beta}-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{sub 11}. The relative abundances of these compounds vary substantially between samples, as indicated by (1) the ratio of 3{beta}-n-pentyl steranes to 3{beta}-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{beta}-alkyl steroids result from bacterial side-chain additions to diagenetic {delta}{sup 2}-sterenes.},
doi = {10.1016/0016-7037(95)00271-Z},
journal = {Geochimica et Cosmochimica Acta},
number = 18,
volume = 59,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 1995},
month = {Fri Sep 01 00:00:00 EDT 1995}
}