Coupled use of carbon isotopes and noble gas isotopes in the Potiguar basin (Brazil): Fluids migration and mantle influence |
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Authors: | Alain Prinzhofer Eugenio Vaz Dos Santos Neto Anne Battani |
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Institution: | 1. Division de Géologie-Géochimie, IFP, 1 and 4, avenue de Bois-Préau, 92852 Rueil-Malmaison Cedex, France;2. PETROBRAS/CENPES/PDEXP/GEOQ, Cidade Universitária-Quadra 7 – Ilha do Fundào 21949-900, Rio de Janeiro, Brazil |
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Abstract: | We used the carbon isotope ratios of hydrocarbons and CO2, and the proportions of noble gas isotopes of associated gases from several geological provinces of the Potiguar Basin (Brazil) for gas/source rock correlation, and to determine maturity, post-genetic processes (migration, leakage, biodegradation), and to assess the possible interactions between hydrocarbons and surrounding waters. Barriers of permeability at the basin scale, the amount of water interacting with the accumulated hydrocarbons, proportion of meteoric water, and contamination of the fluids by the mantle were quantified for the distinct petroleum systems defined in this basin. |
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Keywords: | Petroleum Gas geochemistry Mantle fluids Gas migration Noble gas Isotopes |
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