Estudo geoquimicos com evidencias paleoambientais, maturação e biodegradação dos oleos de diferentes origens da Bacia Potiguar, Brasil : sintese de biomarcadores de esterois / Paleoenvironment, maturation and biodegradation studies of oils collected from differents souces in the Potiguar Basin, Brazil : and biomarkers synthesis from sterols
AUTOR(ES)
Alexsandro Araujo da Silva
DATA DE PUBLICAÇÃO
2003
RESUMO
In this work, will be presented the results of the organic geochemistry study oils of the samples with oils, and two lacustrine freshwater (LAD) and two mixed (M), both of fields near the terrestian cost, and two marine evaporitic oils (ME) of fields located approximately 55 km from the litoral coast. All samples collected from over Estreito-Guamare, Potiguar Basin, RN (Mello et al.79; Santos Neto et al.75) this field have two formation Pendencia and Alagamar. The main subject of the this work is the biomakers organic geochemistry characterization from hydrocarbons and acids components in the samples using the analytical protocol from our group (Koike et al.188 and Lopes et al.185) and to synthetise standards biomaker from commercial stigmasterol and ergosterol. As the results in this thesis show the identifications of the eleven alkylsteranes [four with 5b(H)] configuration] and sixteen carboxyalkylsteranes [eigh with 5b(H)] configuration], distribuited in the all samples collected over Estreito-Guamare, Potiguar basin. These results revealed the important scientific information, also in the Lacustrine Fresh Water oils detected the alkylsteranes biomarkers components. In the literature (Peters et al.1) until this moment it has been published that these biomarkers indicate saline enviromental and this result is one important paleoambiental information. Nine alkylsteranes and ten carboxyalkylsteranes were also detected, in addition to the identification of 2-methyl- and 4-methyl-stigmastanes in ME samples. The results show a high concentration of these compounds in the ME oils and presence but in low concentration in LAD oils, which were identified for the first time in this type of oil and oil Brazilians. Were synthesized three biomarkers for analysis of identification and can also be used in the fortification of samples and quantification of steranes and alkyl-steranes.
ASSUNTO(S)
2- and 4-methyl-steranes alkyl-steranoic acid from brazilian oils biomarcadores neutros e acidos oleos brasileiros acidos alquil-esteranoicos acid and neutral biomarkers 2- e 4-metil-esteranos
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=000428701Documentos Relacionados
- Trace element distributions in biodegraded crude oils and fractions from the Potiguar Basin, Brazil
- Synthesis and identification of biomarkers in oils of the Campos and Potiguar Basin: identification of 3-alkyl-steranes
- Estudo qualitativo e quantitativo de biomarcadores ácidos e hidrocarbonetos presentes em óleos da Bacia Potiguar
- "Methodology for determination of organic geochemistry biomarkers in sediment - Aliphatic hydrocarbons, PAHs, Sterols and Alkenones"
- 'Profetas da chuva' do Seridó potiguar, Brasil