Geochemical and biological marker assessment of depositional environments using Brazilian offshore oils
Identifieur interne : 001308 ( Main/Exploration ); précédent : 001307; suivant : 001309Geochemical and biological marker assessment of depositional environments using Brazilian offshore oils
Auteurs : M. R. Mello [Brésil] ; P. C. Gaglianone [Brésil] ; S. C. Brassell [États-Unis] ; J. R. Maxwell [Royaume-Uni]Source :
- Marine and Petroleum Geology [ 0264-8172 ] ; 1988.
Abstract
A combined geochemical and molecular characterization of a wide selection of oils from the major Brazilian offshore basins has been undertaken. The elemental (sulphur, nickel and vanadium) and bulk (oAPI and δ13C) properties of each sample been considered, together with its molecular composition determined using liquid and gas chromatography, and quantitative biological marker investigations using gas chromatography-mass spectrometry for alkanes.The results reveal significant differences in the chemical features of the various oils which enable them to be divided into five groups. The distinction of the groups appears to reflect differences in the depositional environment of the source rocks of the oils. Each group is correlated tentatively with source rocks laid down in a specific depositional regime, namely lacustrine freshwater, lacustrine saline water, marine evaporitic, marine carbonate or marine deltaic. The diagnostic features that allow this classification are: the relative abundance and carbon number distributions of n-alkanes; pristane/phytane ratios; sulphur, nickel and vanadium contents; carbon isotope data; the absolute concentrations of hopanes and steranes, and their abundance relative to 4-methylsteranes and, also the occurrence and abundance of several specific biological markers, including 18α(H)-oleanane, gammacerane, β-carotane, tricyclic terpanes, higher acyclic isoprenoids, 28, 30-bisnorhopane and 25, 28, 30-trisnorhopane. This investigation shows the value of a combined geochemical and molecular approach in the assessment of the palaeoenvironment of deposition of the source rocks which gave rise to the oils.
Url:
DOI: 10.1016/0264-8172(88)90002-5
Affiliations:
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R." last="Mello">M. R. Mello</name><affiliation wicri:level="2"><country xml:lang="fr">Brésil</country><wicri:regionArea>Petrobras/Cenpes/Divex, Ilha do Fundão, CEP: 21910, Rio de Janeiro, RJ</wicri:regionArea><placeName><region type="state">État de Rio de Janeiro</region></placeName></affiliation></author><author><name sortKey="Gaglianone, P C" sort="Gaglianone, P C" uniqKey="Gaglianone P" first="P. C." last="Gaglianone">P. C. Gaglianone</name><affiliation wicri:level="2"><country xml:lang="fr">Brésil</country><wicri:regionArea>Petrobras/Cenpes/Divex, Ilha do Fundão, CEP: 21910, Rio de Janeiro, RJ</wicri:regionArea><placeName><region type="state">État de Rio de Janeiro</region></placeName></affiliation></author><author><name sortKey="Brassell, S C" sort="Brassell, S C" uniqKey="Brassell S" first="S. C." last="Brassell">S. C. Brassell</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geology, School of Earth Sciences, Stanford University, Stanford, California, CA 94305</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Maxwell, J R" sort="Maxwell, J R" uniqKey="Maxwell J" first="J. R." last="Maxwell">J. R. Maxwell</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Organic Geochemistry Unit, University of Bristol, School of Chemistry, Bristol BS8 ITS</wicri:regionArea><wicri:noRegion>Bristol BS8 ITS</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Marine and Petroleum Geology</title><title level="j" type="abbrev">JMPG</title><idno type="ISSN">0264-8172</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1988">1988</date><biblScope unit="volume">5</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="205">205</biblScope><biblScope unit="page" to="223">223</biblScope></imprint><idno type="ISSN">0264-8172</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0264-8172</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A combined geochemical and molecular characterization of a wide selection of oils from the major Brazilian offshore basins has been undertaken. The elemental (sulphur, nickel and vanadium) and bulk (oAPI and δ13C) properties of each sample been considered, together with its molecular composition determined using liquid and gas chromatography, and quantitative biological marker investigations using gas chromatography-mass spectrometry for alkanes.The results reveal significant differences in the chemical features of the various oils which enable them to be divided into five groups. The distinction of the groups appears to reflect differences in the depositional environment of the source rocks of the oils. Each group is correlated tentatively with source rocks laid down in a specific depositional regime, namely lacustrine freshwater, lacustrine saline water, marine evaporitic, marine carbonate or marine deltaic. The diagnostic features that allow this classification are: the relative abundance and carbon number distributions of n-alkanes; pristane/phytane ratios; sulphur, nickel and vanadium contents; carbon isotope data; the absolute concentrations of hopanes and steranes, and their abundance relative to 4-methylsteranes and, also the occurrence and abundance of several specific biological markers, including 18α(H)-oleanane, gammacerane, β-carotane, tricyclic terpanes, higher acyclic isoprenoids, 28, 30-bisnorhopane and 25, 28, 30-trisnorhopane. This investigation shows the value of a combined geochemical and molecular approach in the assessment of the palaeoenvironment of deposition of the source rocks which gave rise to the oils.</div></front></TEI><affiliations><list><country><li>Brésil</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Californie</li><li>État de Rio de Janeiro</li></region></list><tree><country name="Brésil"><region name="État de Rio de Janeiro"><name sortKey="Mello, M R" sort="Mello, M R" uniqKey="Mello M" first="M. R." last="Mello">M. R. Mello</name></region><name sortKey="Gaglianone, P C" sort="Gaglianone, P C" uniqKey="Gaglianone P" first="P. C." last="Gaglianone">P. C. Gaglianone</name></country><country name="États-Unis"><region name="Californie"><name sortKey="Brassell, S C" sort="Brassell, S C" uniqKey="Brassell S" first="S. C." last="Brassell">S. C. Brassell</name></region></country><country name="Royaume-Uni"><noRegion><name sortKey="Maxwell, J R" sort="Maxwell, J R" uniqKey="Maxwell J" first="J. R." last="Maxwell">J. R. Maxwell</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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