Estudio preliminar de la Cuenca Austral a partir de biomarcadores obtenidos de diversos crudos

Germán Javier Tomas; Adrián Javier Acuña

doi:10.55407/rsge.105146

Authors

Germán Javier Tomas Universidad Tecnológica Nacional - Facultad Regional Santa Cruz, Argentina
Adrián Javier Acuña Universidad Tecnológica Nacional - Facultad Regional Santa Cruz, Argentina

DOI:

https://doi.org/10.55407/rsge.105146

Keywords:

steranes, terpanes, lithology, organic matter, Palermo Aike

Abstract

In Argentina there are several oil-producing basins, including the Austral Basin, whose stratigraphic successions contain several units that behave as reservoir rocks, highlighting in this study the Springhill, Margas Verdes and Piedra Clavada formations. The objective of this work was to analyze the biomarkers of thirteen crude oil samples extracted from these reservoir units, to characterize the organic matter that formed them, the environment in which they were sedimented, the lithology of the source rocks and the degree of relatedness between them. For this purpose, biomarker profiles were analyzed by GC/MS from their aliphatic and aromatic fractions after separation by column chromatography. Specific parameters such as P/F, P/n-C₁₇, F/n-C₁₈, DBT/Ph, % MeDBT and % S_27-28-29indicate that all crudes were generated from type II-III (mixed) organic matter associated with siliciclastic source rocks in sedimentary environments with low oxygen concentration. The results obtained are in agreement with previous studies carried out on crude oils from this basin. In addition, the samples were grouped by the following pattern: tectonic environment and depth of puncturing < source rock-reservoir unit < location with respect to the Gallegos River.

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