Implications of microbial enhanced oil recovery and waterflooding for geochemical interpretation of recovered oils
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2022
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Resumo
Biosurfactants and waterfl ooding have been widely reported thus far for
enhancing oil production. Nevertheless, there is a lack of literature to explore enhanced
oil recovered methods effects on its chemical composition. The aim of this work is
to investigate the effects of a biosurfactant produced by Bacillus safensis and brine
injection on the recovered petroleum composition, and their implications for geochemical
interpretation. Original and oils recovered from displacement tests were analyzed
by gas chromatography and ultra-high-resolution mass spectrometry, emphasizing
saturated and aromatic biomarkers and basic and acidic polar compounds. Geochemical
parameters based on some saturated compounds were subtly affected by the recovery
methods, showing their reliable applicability in geochemical studies. Contrarily,
parameters based on some aromatic compounds were more affected by biosurfactant
fl ooding, mostly the low molecular weight compounds. Thus, these aromatic parameters
should be applied with caution after such methods. The distribution of basic and acidic
polar compounds can also be modifi ed affecting the geochemical interpretation. In the
case of the basic ones, the biosurfactant greatly infl uenced the N class species with
favorable loss of lower aromaticity compounds. In addition to water solubilization, the
compositional changes described in this study can be related to fractionation due to
adsorption on reservoir rocks.
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Biomarkers, Biosurfactant, MEOR, Oil recovery, Petroleomics
Citação
SODRÉ, Luciana G. P. et al. Implications of microbial enhanced oil recovery and waterflooding for geochemical interpretation of recovered oils. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 94, e20211433, 2022. DOI: 10.1590/0001-3765202220211433. Disponível em: https://www.scielo.br/j/aabc/a/SpjkqWDfzYcHY4nVsQzsjNp/?lang=en. Acesso em: 21 jun. 2023.