CS 2 /NMP extraction of immature source rock concentrates

Guo, Shaohui; Li, Shuyuan; Kuangzong, Qin

doi:10.1016/s0146-6380(00)00126-1

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…In the extraction of kerogen using different solvents, such as chloroform, a mixture of methanol/acetone/chloroform, or a mixture of CS 2 and N -methyl-2-pyrrolidinone, extraction yields typically increase with increasing polarity of the organic solvents, indicating an abundance of noncovalent bond interactions between the organic matter and the kerogen structure. , Asphaltene, from the oils suffered from serious biodegradation and depleted in n -alkanes, has been dissolved in toluene and reprecipitated from n -heptane, and then a series of n -alkanes are detected in the organic phase after the reprecipitation of asphaltene, indicating that some primary components were trapped within the asphaltenes , The components present as noncovalently bonded moieties inside the geomacromolecular structure are regarded as adsorbed or occluded molecules. To test and verify the adsorption–occlusion process within the asphaltene structure, Zhao et al carried out simulation experiments under high-pressure/high-temperature conditions, using asphaltenes from a low-matured crude oil and n -C 20 D 42 as the target compound; they detected n -C 20 D 42 in the occluded fraction from the pyrolyzed residue.…”

Section: Adsorption–occlusion In Geomacromoleculesmentioning

confidence: 99%

“…A lot of biomarkers, such as n -alkanes, terpanes, and steranes, have been detected within the structures of geomacromolecules. The occluded n -alkanes can survive, even when the host geomacromolecules undergo serious biodegradation alteration. ,,, This can be attributed to the preservation of the geomacromolecular structures, which alleviate the transformative effects of later geochemical processes and preserve the primary organic geochemical information. − …”

Section: Evolution Property Of Occluded Hydrocarbons Within the Struc...mentioning

confidence: 99%

“…The occluded n-alkanes can survive, even when the host geomacromolecules undergo serious biodegradation alteration. 19,26,30,31 This can be attributed to the preservation of the geomacromolecular structures, which alleviate the transformative effects of later geochemical processes and preserve the primary organic geochemical information. 20−22 Some unusual compounds have been detected in the occluded fractions of solid bitumen and asphaltenes, such as bicyclic terpenoid sulfides, 26 4).…”

Section: Evolution Property Of Occluded Hydrocarbons Within the Struc...mentioning

confidence: 99%

“…35 Previous studies have shown that, based on biomarker indices, the maturity of the occluded fractions does not match that of the adsorbed fractions. Guo et al 30,31 found that the ratios of C 31 hopanes 22S/(22S+22R) and C 29 steranes 20S/ (20S+20R) and ββ/(ββ+αα) from CS 2 /NMP extracts of MaoMing oil shale kerogen were higher than those from chloroform extracts. Zhao et al 27 observed a similar phenomenon that the ratios of Ts/(Ts+Tm) (for explanations of these abbreviations, see Table 2) and C 29 steranes 20S/(20S +20R) in the occluded fraction of ZG31 asphaltene from the Tarim Basin were higher than those from its adsorbed fraction.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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Geochemical Evolution of Occluded Hydrocarbons inside Geomacromolecules: A Review

et al. 2017

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Within geomacromolecules, such as kerogen, asphaltene, and solid bitumen, other compounds can be adsorbed and even occluded as free molecules. The occluded components have been well preserved by the macromolecular structure, and retain some of the primary geochemical information. In this work we try to probe the geochemical evolution of occluded hydrocarbons inside geomacromolecules associated with the geomacromolecule evolution from kerogen → asphaltene → solid bitumen. The results show that occluded hydrocarbons can be transferred steadily from kerogen → asphaltene → solid bitumen. Later-evolved geomacromolecules not only inherit the occluded hydrocarbons from the former ones, but can also occlude some new free molecules. Occluded hydrocarbons are subject to a relatively independent thermal evolution, whereas the evolution of adsorbed molecules is constrained by other factors besides thermal stress. Elucidation of the geochemical evolution of occluded hydrocarbons inside geomacromolecules will be helpful in oil (bitumen)–source correlation, identification of mixed-source reservoirs, and characterization of hydrocarbon accumulation and evolution.

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Section: Adsorption–occlusion In Geomacromoleculesmentioning

confidence: 99%

Section: Evolution Property Of Occluded Hydrocarbons Within the Struc...mentioning

confidence: 99%

Section: Evolution Property Of Occluded Hydrocarbons Within the Struc...mentioning

confidence: 99%

Section: Energy and Fuelsmentioning

confidence: 99%

See 2 more Smart Citations

Geochemical Evolution of Occluded Hydrocarbons inside Geomacromolecules: A Review

et al. 2017

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“…Previous studies have found that the extraction yields of shale and the composition of the soluble mixture are related to the properties of the solvent, extraction temperature, the geochemical parameters of the shale, and so on (Hu et al, 1999;Olukcu et al, 1999;Shaohui et al, 2000;Abourriche et al, 2013;Cao et al, 2019). As the polarity of the solvent increases, the extraction yield increases accordingly (Masaki et al, 2004).…”

Section: The Influence Of Solvents On Extraction Yield and Compositio...mentioning

confidence: 97%

The influence of various solvents extraction on chemical properties on Chang 7 shale, Ordos Basin, China

Yan

Jin

Zhu

et al. 2023

Preprint

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Abstract. To explore the effect of various solvents extraction on the chemical property of shales, several lacustrine shales from Chang 7 member of the Upper Triassic Yanchang Formation, Ordos Basin with maturities from marginally mature (Tmax = 439 ℃) to late mature (Tmax = 456 ℃) were extracted by using acetone, tetrahydrofuran (THF), carbon disulfide (CS2), and benzene, respectively. Fourier transform infrared spectroscopy (FTIR) was employed to examine the functional groups of the samples before and after extraction with different solvents. The results showed that the extraction yield from shale with THF is significantly higher than that of other solvents, which may be related to the properties of the THF, including the aromatic structure, high boiling point, excellent Hansen solubility parameters, and strong polarity. The TOC-normalized yield of the mature sample J1 is significantly higher than that of other samples, which may be related to that the J1 sample is at the peak of hydrocarbon generation, thus a large number of kerogens were cracked into oil and bitumen. The aromaticity of organic matter (OM) increases with the increase of maturity. The length of the aliphatic chains of the organic matter first increased with the increase of maturity before late maturity stage, and then decreased in late maturity stage. The extraction of shales with solvents hardly changes the length of aliphatic chains. Higher aromaticity is observed in shale residues after THF extractions than other solvents (i.e., acetone, CS2, benzene).

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Organic compositions of lacustrine source rocks in Jiyang super-depression and its implication to petroleum geology

et al. 2006

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The compositions of organic matter in four immature source rocks from Tertiary strata of Jiyang super-depression, the most typical continental rift subsidence basin in East China, have been studied by different extracting methods with CHCl 3 , MAC and CS 2 /NMP, respectively. The results suggest that there are great differences among the chemical compositions of organic matter in the source rocks derived from different depositional environments. About 79% of all the organic matter exists by noncovalent bond in the Es 4 source rocks which were deposited under the saline lacustrine, indicating that its organic matter is not the real kerogen, but mainly composed of soluble organic matter which is easy to generate hydrocarbon at lower temperature. This is why the immature oils were derived from Es 4 source rocks in Dongying depression. In contrast, around 60% of organic matter exists by covalent bond in Es 3 source rocks which were deposited under the deep brackish-fresh lacustrine, showing that Es 3 source rocks are mainly composed of kerogen producing mature hydrocarbon at higher temperature. The thermal simulation experiments, upon the remaining solid source rocks which were sequentially extracted by the three solvents, have been carried out. The chloroform extracts from the simulation product have been compared with the other three solvent extracts gained at room temperature. It is obvious that remarkable odd/even predominance (OEP) is mainly the characteristic of soluble organic matter; phytane mostly exists in the soluble organic matter by means of non-covalent bonds and characteristics of soluble organic matter are similar to these in immature oils produced in Jiyang super-depression.

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CS 2 /NMP extraction of immature source rock concentrates

Cited by 13 publications

References 34 publications

Geochemical Evolution of Occluded Hydrocarbons inside Geomacromolecules: A Review

Geochemical Evolution of Occluded Hydrocarbons inside Geomacromolecules: A Review

The influence of various solvents extraction on chemical properties on Chang 7 shale, Ordos Basin, China

Organic compositions of lacustrine source rocks in Jiyang super-depression and its implication to petroleum geology

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