Geochemical characterization with paleoenvironment clues of shales from Pimenteiras Formation, Tocantins State, Parnaíba Basin, Brazil

Authors

  • Eileen Rocío Niño Zambrano Instituto de Geociências, Universidade Federal da Bahia - UFBA (Programa de Pós-graduação em Geoquímica: Petróleo e Meio Ambiente).
  • Olívia Maria Cordeiro de Oliveira Instituto de Geociências, Universidade Federal da Bahia - UFBA (Programa de Pós-graduação em Geoquímica: Petróleo e Meio Ambiente).
  • Hélio Jorge Portugal Severiano Ribeiro Centro de Ciência e Tecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro - UENF (Programa de Pós-graduação do Laboratório de Engenharia e Exploração de Petróleo)

DOI:

https://doi.org/10.11606/issn.2316-9095.v17-395

Keywords:

Pimenteiras Formation, Parnaíba Basin, Source rocks, Devonian, Organic geochemical.

Abstract

The discovery of natural gas in siliciclastic deposits of the Parnaíba Basin has motived new research to understand the petroleum system, to characterize source rock intervals, as well as to improve the paleoenvironmental characterization. Since the deposition of the main source rock in the Parnaíba Basin, the Pimenteiras Formation, occurred during the Devonian, associated with global anoxic event at the Fransnian, shales samples of Devonian were collected from outcrops of Pimenteiras Formation and analyzed using the geochemical techniques of total organic carbon, total sulfur, Rock Eval pyrolysis and stable carbon isotopes. Analysis results of 27 source rock samples indicated that 67% of the samples have a minimum total organic carbon content required to produce hydrocarbons. Approximately 77% of the samples had the potential to generate gas, while the remaining percentage are those corresponding to the samples with the potential to generate oil or gas. The maximum pyrolysis temperature suggests thermal immaturity of the samples. The geochemical data correlation allowed recognizing signs of changes in the depositional paleoenvironment of the outcrops studied, probably by sea flooding.

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Published

2017-09-01

Issue

Vol. 17 No. 3 (2017)

Section

Articles

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How to Cite

Zambrano, E. R. N., Oliveira, O. M. C. de, & Ribeiro, H. J. P. S. (2017). Geochemical characterization with paleoenvironment clues of shales from Pimenteiras Formation, Tocantins State, Parnaíba Basin, Brazil. Geologia USP. Série Científica, 17(3), 67-78. https://doi.org/10.11606/issn.2316-9095.v17-395