Oil Biodegradation in Siliciclastic Reservoir: an Example from Paleogene, Oliva Block, North of Santos Basin, Brazil

Authors

  • Natália Medeiros Marins Nunes Universidade do Estado do Rio de Janeiro, Faculdade de Geologia, Programa de Pós-Graduação em Análise de Bacias e Faixas Móveis, Rua São Francisco Xavier, 524, 20550-900, Rio de Janeiro, RJ, Brasil.
  • Marcus Vinicius Berao Ade Universidade do Estado do Rio de Janeiro, Faculdade de Geologia, Departamento de Estratigraia e Paleontologia, Rua São Francisco Xavier, 524, 20550-900, Rio de Janeiro, RJ, Brasil.
  • Rene Rodrigues Universidade do Estado do Rio de Janeiro, Faculdade de Geologia, Departamento de Estratigraia e Paleontologia, Rua São Francisco Xavier, 524, 20550-900, Rio de Janeiro, RJ, Brasil.
  • Fernanda Botelho de Assis Universidade do Estado do Rio de Janeiro, Faculdade de Geologia, Programa de Pós-Graduação em Análise de Bacias e Faixas Móveis, Rua São Francisco Xavier, 524, 20550-900, Rio de Janeiro, RJ, Brasil.
  • Felipe Nascimento Queiroz Galvão Exploração e Produção S.A., Av. Almirante Barroso,52/110 andar, Centro, 20031-918, Rio de Janeiro, RJ, Brasil.
  • Ricardo Teixeira Nicácio Leite Halliburton Service – Landmarck, Rua Paulo Emídio Barbosa,485, Cidade Universitária, Ilha do Fundão, 21941-907, Rio de Janeiro, RJ, Brasil.

DOI:

https://doi.org/10.11137/2017_3_222_231

Keywords:

Organic geochemistry, Biomarkers, Biodegradation

Abstract

For a petroleum company, the oil biodegradation is an important aspect to appraisal both exploration/production and economic perspective. Black to volatile oils require diferent materials and techniques in comparison to those used for heavy oils. Economically, biodegradable oils has a lower market value than the non-biodegradable oil. Following the presence and absence of a set of biomarkers observed in the chromatograms and fragmentograms, it is possible an interpretation and an indentiication of diferent levels of biodegradation . This methodology comprises the main objective of this work. The oil studied lacks “n” and iso-alkanes, the major proportion of tricyclic on the pentacyclic, the presence of demethylated compounds, plus the major proportion of diasteranes on steranes, suggesting an advanced degree of biodegradation. According to this investigation, the degree 8 of biodegradation (Peter & Moldowan, 1993), records a huge process of bacterial attack happened into the reservoir in a range of temperatu e from 350C up to 500C, from the oil/water contact.

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Published

2019-07-30

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