Analysis and occurrence of C26-steranes in petroleum and source rocks

@article{Moldowan1991AnalysisAO,
  title={Analysis and occurrence of C26-steranes in petroleum and source rocks},
  author={J. Michael Moldowan and Cathy Y. Lee and David S. Watt and Alwarsamy Jeganathan and N. Slougui and Emilio J. Gallegos},
  journal={Geochimica et Cosmochimica Acta},
  year={1991},
  volume={55},
  pages={1065-1081}
}
Abstract The C26-steranes previously reported in oils and source rocks (MOLDOWAN et al., 1985) have been identified as 21-, 24-, and 27-norcholestanes (1A, 1B, and 1C). Various 24-norcholesterols or stanols, possible precursors for the 24-norcholestanes, occur widely at low levels in marine invertebrates and some algae, and 24-norcholestanes occur in marine petroleums of Tertiary through Paleozoic age. There are reports of 27-norcholesterols and stanols in recent sediments, but the precursor… Expand
The significance of 24-norcholestanes, 4-methylsteranes and dinosteranes in oils and source-rocks from East Sirte Basin (Libya)
Abstract The present paper involves a detailed evaluation of specific steroid biomarkers by gas chromatography–mass spectrometry (GC–MS) and GC-metastable reaction monitoring (MRM) analyses ofExpand
Application of 24-norcholestanes for constraining source age of petroleum
Abstract Two C 26 sterane ratios, the 24-nordiacholestane ratio (NDR) and the 24-norcholestane ratio (NCR), are useful for assessing petroleum source age. Values for these parameters generallyExpand
Identification and significance of 3β-ethyl steranes in sediments and petroleum
Abstract 3β-Ethyl steranes (5a-c) occur in ancient sediments and petroleum, particularly those of Paleozoic and Proterozoic age. This newly recognised modification to the sterane ring system has noExpand
Pregnanes as molecular indicators for depositional environments of sediments and petroleum source rocks
Steroids with unconventional side chains have increasingly been applied as diagnostic markers for geological source and age assessments. However, one of the most distinctive characteristics, theExpand
The significance of 24-norcholestanes, triaromatic steroids and dinosteroids in oils and Cambrian–Ordovician source rocks from the cratonic region of the Tarim Basin, NW China
Abstract Two oil families in Ordovician reservoirs from the cratonic region of the Tarim Basin are distinguished by the distribution of regular steranes, triaromatic steroids, norcholestanes andExpand
Identification of C24 and C25 lanostanes in Tertiary sulfur rich crude oils from the Jinxian Sag, Bohai Bay Basin, Northern China
Abstract Unusual short chain lanostanes (C 24 and C 25 ) and C 30 lanostane were identified in sulfur rich crude oils from the Jinxian Sag, Bohai Bay Basin, northern China. Besides the regularExpand
A novel sterane, 27-nor-24-methyl-5[alpha]-cholestane, in sediments
A novel sterane, 27-nor-24-methyl-5[alpha]-cholestane, has been identified in sedimentary hydrocarbon mixtures by coinjection with an authentic standard. The C[sub 27] sterane occurs in silica-richExpand
Distribution and significance of novel low molecular weight sterenes in an immature evaporitic sediment from the Jinxian Sag, North China
Abstract An unusual series of C 22 –C 27 monounsaturated sterenes and C 24 –C 30 tetracyclic terpanes (17,21- seco hopanes) were detected in relatively high concentrations in an immature evaporiticExpand
Geochemical evidence for an Early Cambrian origin of the ‘Q’ oils and some condensates from north Oman
The Q family of oils from Oman was previously recognized as highly unusual and distinct from the more prevalent Huqf oil family by having an extraordinarily high C27/C29 sterane ratio and δ13C valuesExpand
Molecular fossils and oil-source rock correlations in Tarim Basin, NW China
The distribution of “molecular fossils” (biomarkers) of steroid compounds in extracts from some specific geologic age in the Tarim Basin have been analyzed and are used as the fingerprints for theExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 43 REFERENCES
Structure and significance of C30 4-methyl steranes in lacustrine shales and oils
Abstract The structure of the abundant C 30 4-methyl steranes of ancient freshwater lacustrine sediments and derived oils is of interest as their precursors, the 4-methyl and, in particular,Expand
Sedimentary 12-n-Propylcholestanes, Molecular Fossils Diagnostic of Marine Algae
TLDR
Screening of a few organic-rich sedimentary rocks and oils from throughout the Phanerozoic suggests that these C30-steranes first appeared and, therefore, their source algae evolved between Early Ordovician and Devonian. Expand
Dinosterane and other steroidal hydrocarbons of dinoflagellate origin in sediments and petroleum
Abstract The steroidal alkanes of a selection of sediments and oils have been examined by GC-MS with multiple metastable reaction monitoring. Specific 4-methyl sterane isomers have been identified byExpand
Applications of steranes, terpanes and monoaromatics to the maturation, migration and source of crude oils
Abstract Novel biological marker parameters are applied to problems of geochemical correlation of crude oils in the McKittrick Field, California. An attempt is described to distinguish fourExpand
The effect of biodegradation on steranes and terpanes in crude oils
Abstract Steranes and terpanes biodegrade at a slower rate than isoprenoids and survive moderate biodegradation. Heavy biodegradation results in destruction of regular steranes, survival ofExpand
Distinctive hydrocarbon biomarkers from fossiliferous sediment of the Late Proterozoic Walcott Member, Chuar Group, Grand Canyon, Arizona
Abundant extractable hydrocarbons, in association with well preserved kerogen, have been recognised in a dolostone from the Chuar Group (approx. 850 Ma). The biomarkers present include C15-C30,Expand
Effects of source, thermal maturity, and biodegradation on the distribution and isomerization of homohopanes in petroleum
Abstract The distributions of C31–C35 17α,21β(H)-homohopanes in marine petroleums can be used to describe redox conditions in the source rock depositional environment. For example, highExpand
Structure and significance of a novel rearranged monoaromatic steroid hydrocarbon in petroleum
Abstract A monoaromatic steroid hydrocarbon isolated from a catalytic dehydrogenation/isomerization mixture derived from 5α-cholestane was determined to be a (10β→ 5β) CH 3 -rearranged monoaromaticExpand
A review of sterol markers for marine and terrigenous organic matter
TLDR
It is indicated that inferences drawn from sterol distributions regarding sources of organic matter must be made with caution and should be supported using other lipid data, and that in ancient sediments and crude oils a high proportion of C 29 steranes need not indicate that most of the organic matter was derived from vascular plants. Expand
Relationship Between Petroleum Composition and Depositional Environment of Petroleum Source Rocks
Crude oils of nonmarine source can be distinguished from those of marine shale source and from oils originating in marine carbonate sequences by using a battery of geochemical parameters, asExpand
...
1
2
3
4
5
...