Determination of the series of even carbon numbered n-alk-1-enes trapped inside geomacromolecules

Cheng, Bin; Yang, Chen; Du, Junyan; Zhao, Jing; Liao, Zewen

doi:10.1016/j.marpetgeo.2013.11.013

Cited by 11 publications

(10 citation statements)

References 13 publications

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“…A series of n -alkanoic acid ethyl esters and 1-alkenes with an even number of carbon atoms in the molecule were identified among maltenes of asphaltene aggregates of oils from northwest China . The presence of occluded 1-alkenes with an even number of carbon atoms in the molecule is reported in refs , . Cheng et al reported that the source of these compounds is esters present in the original organic matter (OM).…”

Section: Resultsmentioning

confidence: 93%

“…73 The presence of occluded 1-alkenes with an even number of carbon atoms in the molecule is reported in refs 74, 75. Cheng et al 75 reported that the source of these compounds is esters present in the original organic matter (OM). Esters generate olefins in the course of geochemical transformation of OM, which are captured by macromolecules of kerogen and then inherited by asphaltenes formed from kerogen.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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Resins and Asphaltenes of Light and Heavy Oils: Their Composition and Structure

et al. 2019

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The complex of physicochemical methods of analysis (elemental analysis, cryoscopy in benzene, IR and 1H NMR spectroscopies, structural group analysis, gas chromatography–mass spectrometry, and selective chemical cleavage of sulfide and ether bonds) is used to comparatively characterize resins and asphaltenes of light and heavy oils. Attention is paid to the study of their structural group composition and the composition of moieties bound in molecules of resin–asphaltene substances (RAS) through ether and sulfide bridges, as well as the composition of compounds occluded by asphaltene molecules and nitrogen bases of resins. It is found that resins and asphaltenes of the heavy oil are characterized by higher average molecular masses and large overall sizes of mean molecules, due to the increased content of aromatic cycles in the naphthenic–aromatic system. The similar sets of linear and branched alkanes, alkylcyclopentanes, alkylcyclohexanes, steranes, mono- and disubstituted alkylbenzenes, and dibenzothiophenes identified in occluded compounds and products of chemolysis of resins and asphaltenes under study suggest the presence of most of these compounds as structural fragments in RAS molecules of light and heavy crude oils under study. Alkyl-substituted quinolines and benzoquinolines are identified in the nitrogen bases of resins. The feature of the light oil is the presence of “sulfur-bound” alkenes and polycycloalkenes in the structure of its asphaltenes. The findings expand our understanding of the structure of petroleum resins and asphaltenes. They can be used to simulate their structure in developing new controlled methods for processing hydrocarbon feedstock.

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Section: Resultsmentioning

confidence: 93%

Section: Energy and Fuelsmentioning

confidence: 99%

Resins and Asphaltenes of Light and Heavy Oils: Their Composition and Structure

et al. 2019

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“…By using the method of mild oxidative degradation with H 2 O 2 /CH 3 COOH to treat geomacromolecules, many biomarkers associated with their parent biomass are detected among the occluded components of the geomacromolecules, such as terpanes, steranes, and series of even-carbon-numbered n -alk-1-enes and n -alkanes. − ,− ,− …”

Section: Adsorption–occlusion In Geomacromoleculesmentioning

confidence: 99%

“…As representative geomacromolecules from source rock or oil reservoirs, kerogen, asphaltene, and solid bitumen are important study objects for the geochemical information encoded with them. Their macromolecular structures can adsorb and even occlude other small molecules (e.g., biomarkers). − The occluded molecules can be well preserved by the macromolecular structure and thus prevented from contact with extraneous reagents, catalysts, microbes, or surface-derived formation waters flowing through the deposit. − Therefore, the occluded fraction can retain primary organic geochemical information over the geological time. − Besides the free molecules occluded inside the geomacromolecular structure, some biomarkers are covalently bonded to the geomacromolecular structure so that they retain earlier geochemical characterization. − …”

Section: Introductionmentioning

confidence: 99%

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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“…It has been reported that geological macromolecules such as asphaltene (Liao et al, 2005;2006a, b, c), solid bitumen (Cheng et al, 2012;Cheng et al, 2014aCheng et al, , 2014b and kerogen (Cheng et al, 2014b) are able to adsorb and even occlude other small molecules into their macromolecular structures. The occluded hydrocarbons can be well preserved by the macromolecular structures and have been found useful in the study of organic matter with depleted soluble fractions (Cheng et al, 2012), oil (bitumen)-source correlation (Liao and Geng, 2002;Cheng.…”

Section: Introductionmentioning

confidence: 99%