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. This paper presents a study of the physicochemical and isotopic characteristics of formation waters from the Castanhal, Siririzinho and Aguilhadafields in the Sergipe Basin, northeastern Brazil. In each of the samples, pH, conductivity, concentration of dissolved inorganic carbon (DIC), δ18O, δ2H, and δ13C weremeasured. These measurements are used to identify isotopic similarities among waters from local aquifers, which can be used as a proxy for groundwater connectivitywith formation water. Formation waters from the Castanhal and Siririzinho fields are enriched in deuterium, as evidenced by their δ2H values above the Global MeteoricWater Line (GMWL), which may be a result of significant isotopic exchange between water and H2S. These measurements are in accordance with the large enrichment in13C of DIC resulting from biodegradation, with the formation of methane depleted in 13C and CO2 enriched in 13C. These results indicate interaction between formationwater with rocks and other fluids. Keywords: stable isotopes, dissolved inorganic carbon, biodegradation. RESUMO. Este trabalho apresenta um estudo das caracteristicas fisico-quimicas e isotopicas de aguas de formacao dos campos Castanhal, Siririzinho e Aguilhada, localizados na Bacia de Sergipe, nordeste do Brasil. Em cada uma das amostras foram medidos os parâmetros pH, condutividade eletrica, concentracao de carbonoinorgânico dissolvido (CID), δ18O, δ2H e δ13C. A partir dos resultados obtidos, foi possivel identificar a similaridade isotopica com as aguas de aquiferos locais,indicando conexao de agua subterrânea com agua de formacao. As aguas de formacao dos campos Castanhal e Siririzinho apresentaram um enriquecimento em deuterio,resultado da troca isotopica entre a agua e o H2S. Tambem foi verificado, um grande enriquecimento no δ13C do CID, resultado dos processos de biodegradacao coma formacao de metano empobrecido em 13C e CO2 enriquecido neste isotopo. Os resultados encontrados indicam interacao entre a agua de formacao com as rochas ecom outros fluidos. Palavras-chave: isotopos estaveis, carbono inorgânico dissolvido, biodegradacao.

PHYSICOCHEMICAL AND ISOTOPIC CHARACTERIZATION OF FORMATION WATERS FROM OIL FIELDS IN THE SERGIPE BASIN, BRAZIL