LAUSR

espanolLos perfiles de biomarcadores son caracteristicos de cada crudo. El objetivo de este estudio fue evaluar los biomarcadores en muestras de petroleo mediante analisis geoquimicos. Se obtuvieron muestras de las cuencas Austral y del Golfo San Jorge. Se analizaron las fracciones alifaticas y aromaticas por cromatografia de gases acoplada a espectrometria de masas. Se calcularon relaciones de biomarcadores a partir de isoprenoides, terpanos y esteranos para sugerir la materia organica precursora, el ambiente de depositacion y roca madre para diferenciar las distintas fuentes de petroleo. Segun los parametros especificos, el crudo de la cuenca Austral pudo generarse a partir de materia organica tipo II-III, en ambientes de deposicion con concentracion moderada de oxigeno, litologia siliciclastica y madurez termica moderada a alta. Por el contrario, los crudos de la cuenca del Golfo San Jorge mostraron caracteristicas asociadas a un kerogeno tipo II, en un entorno anoxico, litologia carbonatada y baja madurez termica EnglishBiomarker profiles are characteristic of oils. The goal of this study was to evaluate the biomarkers in oil samples using geochemical analysis. Oil samples were obtained from Austral Basin and Golfo San Jorge Basins. Specifically, aliphatic and aromatic fractions were analyzed by Gas Chromatography coupled to Mass Spectrometry. Biomarker ratios were calculated for isoprenoids, terpanes and steranes to correlate the organic matter precursor, deposition environment and source rock to differentiate distinct crude oil sources. Based on the specific parameters, crude from the Austral Basin appears to have been generated from organic matter types II-III (mixed), in deposition environments with moderate oxygen concentration, associated with a siliciclastic lithology and a moderate to high thermal maturity. On the contrary, the crude oils from the Golfo San Jorge Basin displayed biomarkers profiles characteristics of a type II (marine) kerogen, corresponding to an anoxic deposition environment, carbonated lithology and low thermal maturity