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Organic and mineral matter changes due to oil generation, saturation and expulsion processes based on artificial maturation experiments
Souza, I. V. A. F. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Araújo, C. V. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Menezes, T. R. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Coutinho, L. F. C. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Binnotto, R. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Spigolon, A. L. D. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Fontes, R. A. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Santos Neto, E. V. (PETROBRAS, CENPES (Rio de Janeiro, Brasil))
Rondon, N. D. V. F. (Universidade Federal do Rio de Janeiro. Instituto de Geociências)
Mendoça Filho, J. G. (Universidade Federal do Rio de Janeiro. Instituto de Geociências)

Data: 2014
Resum: Hydrous pyrolysis experiments were conducted on immature organic-rich rock with type-I kerogen to evaluate petroleum generation, saturation and expulsion processes. The experiments were carried out under isothermal conditions at ten different temperatures (280° through 360°C) for nine different time spans between 18 and 144h. Rock samples recovered from the experiments were analyzed for total organic carbon (TOC–weight%), Rock-Eval pyrolysis, vitrinite reflectance (Ro%), spectral fluorescence and visual characterization of organic matter under the microscopy. TOC, S2 and HI tend to decrease with increasing temperature and duration of the experiments as expected. The Ro% values reach up to 1. 14% in the most severe experiment (i. e. 360°C/96h). The Ro% is believed to be suppressed due to hydrogen incorporation from bitumen. The bitumen production was observed with the increase of transformation index (TI) and two types of bitumen were differentiated by fluorescence color. The bitumen with yellow fluorescence was mainly composed of saturate and aromatic hydrocarbons that were probably generated earlier than the bitumen with brown fluorescence which is rich in NSO compounds. The greatest bitumen saturation occurs at TI around of 41% to 45%, when the S1 reaches its highest values. The decrease of bitumen saturation and consequent oil expulsion is marked by a reduction in S1 values and fluorescence color. This phenomenon occurs simultaneously with the development of fractures and voids in the mineral matrix which reduces the oil retention capability and facilitates the expulsion process. These observations enhanced the understanding of oil generation and saturation processes, as well as primary migration, expulsion and type of generated bitumen.
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria. Creative Commons
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Matèria: Hydrous pyrolysis ; Oil generation ; Primary migration ; Suppressed-vitrinite ; Organic petrography ; Oil expulsion
Publicat a: Geologica acta, Vol. 12 Núm. 4 (december 2014) , p. 351-362, ISSN 1696-5728

DOI: 10.1344/GeologicaActa2014.12.4.6

17 p, 2.8 MB

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