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Titolo:
Carboxylic acids of marine evaporitic oils from Sergipe-Alagoas Basin, Brazil
Autore:
Rodrigues, DC; Koike, L; Reis, FDM; Alves, HP; Chang, HK; Trindade, LA; Marsaioli, AJ;
Indirizzi:
UNICAMP, Inst Quim, BR-13081970 Campinas, SP, Brazil UNICAMP Campinas SP Brazil BR-13081970 BCBR-13081970 Campinas, SP, Brazil Petrobras E&P SEAL, BR-49075020 Aracaju, SE, Brazil Petrobras E&P SEAL Aracaju SE Brazil BR-49075020 BC20 Aracaju, SE, Brazil UNESP, IGCE, DGA, BR-13506900 Rio Claro, SP, Brazil UNESP Rio Claro SP Brazil BR-13506900 BCBR-13506900 Rio Claro, SP, Brazil Cenpes, Petrobras, BR-21949900 Rio De Janeiro, Brazil Cenpes Rio De Janeiro Brazil BR-21949900 BC949900 Rio De Janeiro, Brazil
Titolo Testata:
ORGANIC GEOCHEMISTRY
fascicolo: 11, volume: 31, anno: 2000,
pagine: 1209 - 1222
SICI:
0146-6380(2000)31:11<1209:CAOMEO>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRUDE OILS; 3-BETA-ALKYL STERANES; ACYCLIC ISOPRENOIDS; MARACAIBO BASIN; CAMPOS BASIN; INDICATORS; ENVIRONMENTS; SEDIMENTS; MIGRATION; SERIES;
Keywords:
Sergipe-Alagoas Basin; Brazil; Carmopolis oil field; marine evaporitic petroleum; acidic biomakers; steroid-alkanoic acids; C-25 regular isoprenoid acid;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Marsaioli, AJ UNICAMP, Inst Quim, CP 6154, BR-13081970 Campinas, SP, Brazil UNICAMP CP 6154 Campinas SP Brazil BR-13081970 BC SP, Brazil
Citazione:
D.C. Rodrigues et al., "Carboxylic acids of marine evaporitic oils from Sergipe-Alagoas Basin, Brazil", ORG GEOCHEM, 31(11), 2000, pp. 1209-1222

Abstract

A. suite of 10 different marine evaporitic oil samples from Sergipe-Alagoas Basin, Brazil was studied for its biomarker content, in particular its acidic constituents. The oils showed different molecular distributions and relative abundances of n-alkanoic, isoprenoid and hopanoic acids. The observed differences were assigned to the incorporation of immature organic matterin the oils and fractionation along the migration pathway. The diagenetic precursor functionality (alcohol/ether or acid) was proposed based on the comparison of the relative abundances of the neutral and acidic biomarkers (hopanoids, isoprenoids, alkyl-steranes, monoaromatic alkyl-steroids). In the acidic fraction, 3 series of steroid-alkanoic acids and monoaromatic steroid-alkanoic acids (steroid-methanoic, ethanoic and propanoic acids and monoaromatic steroid-methanoic, ethanoic and propanoic acids) were detected, while in the neutral fraction only 2 series of each corresponding class could be observed (methyl and ethyl-steranes and monoaromatic methyl and ethyl-steroids). These carbon shifts suggest that decarboxylation is an importantprocess in the formation of the alkyrsteranes and monoaromatic alkyl-steroids, and we infer that carboxylic acids are the diagenetic precursors of these classes of compounds. When alcohol or ether are the diagenetic precursors (isoprenoids and hopanoids), no significant differences in the moleculardistributions between neutral and acidic fractions were observed. (C) 2000Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/12/17 alle ore 23:42:48