Hydrocarbon speciation in ancient sediments studied by stepwise high-temperature supercritical carbon dioxide extraction

Jaffé, Rudolf; Diaz, Doraida; Hajje, Neghie; Chen, Li; Eckardt, Christian B.; Furton, Kenneth G.

doi:10.1016/s0146-6380(96)00153-2

Cited by 26 publications

(13 citation statements)

References 15 publications

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“…For thermodesorption of these higher molecular weight hydrocarbons the vast majority were recovered at the very highest temperature (95.7% at 350 8C). Consistent with pre- vious reports [14], anthracene and methyl-anthracenes were only removed at the highest temperatures for both the SFE and the thermodesorption experiments, suggesting again that these compounds are strongly associated with the desorption resistant fraction.…”

Section: Recovery Of Aromatic Hydrocarbonssupporting

confidence: 88%

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Relative Recoveries of Hydrocarbons from Geological Samples Using High Temperature Supercritical Fluid Extraction: Contributions from Thermal Desorption

Furton

Chen

Jaffé

1999

J. High Resol. Chromatogr.

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Section: Recovery Of Aromatic Hydrocarbonssupporting

confidence: 88%

“…Extracts were concentrated with a rotary evaporator and by gentle nitrogen gas blow down. The schematic diagram of the SFE system has been published elsewhere [14]. A 3 g sample of Posidonia shale was placed in the extraction cell and extracted by supercritical CO 2 at 5000 psi and at a consecutive stepwise temperature profile described below.…”

Section: Methodsmentioning

confidence: 99%

Relative Recoveries of Hydrocarbons from Geological Samples Using High Temperature Supercritical Fluid Extraction: Contributions from Thermal Desorption

Furton

Chen

Jaffé

1999

J. High Resol. Chromatogr.

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“…Another unique thing about SFE is that selective extraction is also possible, it has been found to be a useful tool to study speciation of extractable hydrocarbons (Furton et al 1999). Supercritical fluid extraction (SFE) with carbon dioxide has been successfully applied to the extraction of organic compounds from petroleum source rocks (Monin et al 1998;Hopfgartner et al 1990;Ashraf-Khorassani et al 1992;Greibrokk et al 1992;Jaffe et al 1997;Furton et al 1999;Akinlua et al 2008). The use of SFE method for geochemical characterization of petroleum source rocks has been limited.…”

Section: Introductionmentioning

confidence: 99%

Geochemical evaluation of Niger Delta sedimentary organic rocks: a new insight

Akinlua

Torto

2010

Int J Earth Sci (Geol Rundsch)

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A geochemical evaluation of Niger Delta organic matter was carried out using supercritical fluid extraction (SFE) sample preparation procedure. Comparison of geochemical significance of gas chromatographic data of rock extracts of SFE with those of Soxhlet extraction method from previous studies was made in order to establish the usefulness of SFE in geochemical exploration. The assessment of geochemical character of the rock samples from the comparison and interpretation of other geochemical parameters were used to give more insights into understanding the source rocks characteristics of onshore and shelf portions of the Niger Delta Basin. The results of the gas chromatographic (GC) analysis of the rock extracts across the lithostratigraphic units show that Pr/Ph, Pr/nC 17 , Pr/nC 18 , CPI and odd/even preference ranged from 0.07 to 12.39, 0.04 to 6.66, 0.05 to 13.80, 0.12 to 8.4 and 0.06 to 8.12, respectively. The Rock-Eval pyrolysis data and geochemical ratios and parameters calculated from the GC data showed that most of the samples are mature and have strong terrestrial provenance while a few samples have strong marine provenance. The few marine source rocks are located in the deeper depth horizon. Pr/Ph and standard geochemical plots indicate that most of samples were derived from organic matter deposited in less reducing conditions, i.e. more of oxidizing conditions while a few samples have predominantly influence of reducing conditions. The results of trace metal analysis of older samples from Agbada Formation also indicate marine and mixed organic matter input deposited in less reducing conditions. The results obtained in this study are comparable with those obtained from previous studies when Soxhlet extraction method was used and also indicated the presence of more than one petroleum systems in the Niger Delta.

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“…Previous works show that "trapped" or "bound" hydrocarbons isomerize at slower rates than free hydrocarbons (Derenne et al, 1988;Jaffé and Gardinali, 1990;Jaffé et al, 1997).…”

Section: Discussion Of Possible Mechanisms For Mineral Preservation Omentioning

confidence: 99%

Testing the ancient marine redox record from oxygenic photosynthesis to photic zone euxina

French¹

2015

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Tracing the evolution of Earth's redox history is one of the great challenges of geobiology and geochemistry. The accumulation of photosynthetically derived oxygen transformed the redox state of Earth's surface environments, setting the stage for the subsequent evolution of complex life. However, the timing of the advent of oxygenic photosynthesis relative to the Great Oxidation Event (GOE; ~2.4 Ga) is poorly constrained. After the deep ocean became oxygenated in the early Phanerozoic, hydrogen sulfide, which is toxic to most aerobes, may have transiently accumulated in the marine photic zone (i.e. photic zone euxinia; PZE) during mass extinctions and oceanic anoxic events. Here, the molecular fossil evidence for oxygenic photosynthesis and eukaryotes is reevaluated, where the results imply that currently existing lipid biomarkers are contaminants. Next, the stratigraphic distribution of green and purple sulfur bacteria biomarkers through geologic time is evaluated to test whether these compounds reflect a water column sulfide signal, which is implicit in their utility as PZE paleoredox proxies. Results from a modern case study underscore the need to consider allochthonous and microbial mat sources and the role of basin restriction as alternative explanations for these biomarkers in the geologic record, in addition to an autochthonous planktonic source.

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Hydrocarbon speciation in ancient sediments studied by stepwise high-temperature supercritical carbon dioxide extraction

Cited by 26 publications

References 15 publications

Relative Recoveries of Hydrocarbons from Geological Samples Using High Temperature Supercritical Fluid Extraction: Contributions from Thermal Desorption

Relative Recoveries of Hydrocarbons from Geological Samples Using High Temperature Supercritical Fluid Extraction: Contributions from Thermal Desorption

Geochemical evaluation of Niger Delta sedimentary organic rocks: a new insight

Testing the ancient marine redox record from oxygenic photosynthesis to photic zone euxina

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