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DECONVOLUTION OF PETROLEUM SOURCES IN SOUTHEASTERN OFFSHORE BRAZILIAN BASINS USING STABLE CARBON ISOTOPE RATIOS OF n-ALKANESGold Open Access

Authors: T. Barra, C. Torres, M. Dal Sasso, E. Santos Neto and D. Azevedo
Event name: 29th International Meeting on Organic Geochemistry
Session: Posters - Isotopes
Publication date: 04 September 2019
DOI: 10.3997/2214-4609.201902912
Language: English
Info: Extended abstract, PDF ( 257.07Kb )

Summary:
In this study, six oil samples from Southeastern offshore Brazilian Basins were geochemically characterized using n-alkane carbon isotope ratios (δ13C) and saturated biomarkers. Carbon isotopic patterns of n-alkanes have the characteristic asymmetrical “U” shape between n-C13 and n-C32, except for one sample, and isotopic amplitudes varying between 3.2 and 6.9‰. All samples analyzed have shown lacustrine characteristics in δ13C of n-alkanes and in biomarkers, excepted for TAB-4G sample. The marine biomarker signature and the isotopic profile of n-alkanes suggests terrestrial O.M. contribution in TAB-4G probably related to a depositional environment of source represented by a transitional realm, e.g., delta.

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