Pentacyclic Terpanes as Indicators of Compositional Heterogeneities in Biodegraded Oil Reservoir

Martins, Larissa Castelo Guedes; Franklin, Gabriel; Souza, Eliane Soares de; Cruz, Georgiana Feitosa da

doi:10.5935/0100-4042.20140222

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Except for the API gravity and GC with flame ionization detection (GC-FID) analyses, the other analyses were peformed with the maltenic fraction from the crude oils. For this, the asphaltenes were removed by n -hexane precipitation followed by filtration according to Martins et al Asphaltene deposits were collected by filtration and washed with hexane (60 mL) for removal of impurities such as resins and possible adsorbed compounds. The maltenic fraction was used in the determination of saturated, aromatic, and polar content and chromatography analysis.…”

Section: Methodsmentioning

confidence: 99%

Exploratory Analysis of Campos Basin Crude Oils via Geochemical Parameters by Comprehensive Two-Dimensional Gas Chromatography/Time-of-Flight Mass Spectrometry

et al. 2018

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Comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC×GC–TOFMS) was used for geochemical characterization of 18 oil samples from Campos Basin, Brazil. Conventional analyses were also performed on these oils (API gravity and GC-FID) and in the maltenic fraction (saturated, aromatic, and polar analysis) after asphaltene precipitation, aiming the oil screening for a rapid assessment of general characteristics. The results from principal component analysis with the biomarker parameters of source, maturity, and biodegradation obtained by GC×GC–TOFMS separated the oils into two groups, mainly explained by gammacerane content. The higher sensitivity and resolution of GC×GC–TOFMS allowed the identification of unusual compounds in oils from this basin, such as methylhopanes (whose calculated ratios allowed the oils in this work to be classified as having a marine, lacustrine, or “mixed” source, the same interpretation obtained by statistical analysis), moretanes (with results that reinforce the hypothesis of same thermal evolution for the studied samples), and short-chain steranes (C21 and C22), detected in very low concentrations in all of the samples. This study is the first to show the presence of these compounds in Campos Basin crude oils.

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Section: Methodsmentioning

confidence: 99%

Exploratory Analysis of Campos Basin Crude Oils via Geochemical Parameters by Comprehensive Two-Dimensional Gas Chromatography/Time-of-Flight Mass Spectrometry

et al. 2018

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“…Control Oil, Oil I, and Oil II samples were fractionated on a classical liquid chromatography from which saturated hydrocarbons, aromatics, and polar compounds were obtained using n-hexane, n-hexane:dichloromethane (DCM) (8:2,v/v), and DCM:methanol (MeOH; 9:1,v/v), respectively (details in Martins et al 2014). The saturated and aromatic fractions were characterized using gas chromatography-mass spectrometry (GC-MS).…”

Section: Core Flooding Experiments and Oil Samples Characterizationmentioning

confidence: 99%

Implications of microbial enhanced oil recovery and waterflooding for geochemical interpretation of recovered oils

Sodré

Martins

Araujo

et al. 2022

An. Acad. Bras. Ciênc.

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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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Pentacyclic Terpanes as Indicators of Compositional Heterogeneities in Biodegraded Oil Reservoir

Cited by 2 publications

References 8 publications

Exploratory Analysis of Campos Basin Crude Oils via Geochemical Parameters by Comprehensive Two-Dimensional Gas Chromatography/Time-of-Flight Mass Spectrometry

Exploratory Analysis of Campos Basin Crude Oils via Geochemical Parameters by Comprehensive Two-Dimensional Gas Chromatography/Time-of-Flight Mass Spectrometry

Implications of microbial enhanced oil recovery and waterflooding for geochemical interpretation of recovered oils

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