Evaluación geoquímica por biomarcadores del yacimiento del Mosquito de la cuenca Austral de la patagonia argentina
Date
2020
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Abstract
En el petróleo existe un grupo de moléculas conocidas como biomarcadores
capaces de permanecer estables durante las agresivas condiciones en las que aquel se
forma. El objetivo de este trabajo fue analizar los biomarcadores de cuatro muestras de
crudo extraídas del yacimiento Del Mosquito, que permite una caracterización profunda
de los mismos respecto a la materia orgánica que los formó, la litología y ambiente de
sedimentación de la roca generadora, y la evolución térmica. Para tal fin, se analizaron
los perfiles de biomarcadores por GC/MS a partir de sus fracciones alifáticas y aromáticas
previa separación por cromatografía en columna. Parámetros específicos tales como P/F,
P/n-C17, F/n- C18, T24/T23, T26/T25 y H29/H30 indican que el crudo del yacimiento Del Mosquito parece haberse generado de materia orgánica tipo II-III (mixta), asociada a una roca
madre siliclástica en ambientes de sedimentación marinos con moderada concentración
de oxígeno, y en la ventana de generación del crudo. Estos resultados obtenidos se
corresponden con la composición particular de la Formación Springhill de la Cuenca
Austral de la cual provienen los crudos.
Most hydrocarbons have a group of molecules known as biomarkers capable of remaining stable during the aggressive conditions under which they formed. The objective of this paper is analyze key biomarkers of the four samples of crude oil extracted from the Del Mosquito reservoir in the Austral Basin in Southern Argentina, which allows the characterization of their precursor organic matter, the lithology and depositional environment of source rock and the thermal evolution. Biomarker profiles were analyzed by GC / MS from aliphatic and aromatic fractions after separation by column chromatography. Specific parameters such as Pr/Ph,Pr/n-C17,Fi/n-C18,T24/T23,T26/T25 and H29/H30 indicate that the crude oil from the Del Mosquito seems to have been generated from type II-III organic matter (mixed), associated with a siliclastic source rock in marine sedimentation environment with moderate oxygen concentration, and in the oil generation window. The results show correlation with the Springhill geological formation, defined for the Austral Basin.
Most hydrocarbons have a group of molecules known as biomarkers capable of remaining stable during the aggressive conditions under which they formed. The objective of this paper is analyze key biomarkers of the four samples of crude oil extracted from the Del Mosquito reservoir in the Austral Basin in Southern Argentina, which allows the characterization of their precursor organic matter, the lithology and depositional environment of source rock and the thermal evolution. Biomarker profiles were analyzed by GC / MS from aliphatic and aromatic fractions after separation by column chromatography. Specific parameters such as Pr/Ph,Pr/n-C17,Fi/n-C18,T24/T23,T26/T25 and H29/H30 indicate that the crude oil from the Del Mosquito seems to have been generated from type II-III organic matter (mixed), associated with a siliclastic source rock in marine sedimentation environment with moderate oxygen concentration, and in the oil generation window. The results show correlation with the Springhill geological formation, defined for the Austral Basin.
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Hopanos, Esteranos, Formación Springhill, Formación Tobífera, Cuenca Austral, Hopanes, Steranes, Springhill formation, Springhill formation, Austral Basin
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