Item talk:Q312366
From geokb
{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Molecular mechanisms of solid bitumen and vitrinite reflectance suppression explored using hydrous pyrolysis of artificial source rock", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70241842", "url": "https://pubs.usgs.gov/publication/70241842" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70241842 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1016/j.orggeochem.2022.104371", "url": "https://doi.org/10.1016/j.orggeochem.2022.104371" } ], "journal": { "@type": "Periodical", "name": "Organic Geochemistry", "volumeNumber": "165", "issueNumber": null }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Organic Geochemistry" } ], "datePublished": "2022", "dateModified": "2023-03-29", "abstract": "The most commonly used parameter for thermal maturity calibration in basin modelling is mean random vitrinite reflectance (Ro). However, Ro\u00a0suppression has been noted in samples containing a high proportion of liptinite macerals. This phenomenon has been demonstrated empirically using hydrous pyrolysis of artificial source rock containing various proportions of thermally immature Wyodak-Anderson coal and liptinite-rich kerogen from the Parachute Creek Member of the Green River Formation. Analysis of samples pyrolyzed at 330\u00a0\u00b0C for 72\u00a0h demonstrates that Ro\u00a0values of both vitrinite and solid bitumen are suppressed in rocks containing liptinite-rich kerogen. Raman and micro-Fourier transform infrared (\u00b5-FTIR) analyses were performed to investigate the mechanisms of suppression. Raman maturity proxies show decreased aromaticity in samples with suppressed Ro, particularly in solid bitumen, with aromaticity decreasing as the proportion of liptinite increases. The \u00b5-FTIR proxy for aliphatic chain length and/or branching ratio is static in solid bitumen, yet increases slightly in vitrinite as the liptinite proportion increases. These spectroscopic results suggest slightly different suppression mechanisms for vitrinite and solid bitumen, with reduced CC bond cleavage and marginally reduced aromaticity in vitrinite with suppressed Ro, and strongly reduced aromaticity and CC bond cleavage in solid bitumen with suppressed Ro. These results support the hypothesis that the generation of free radicals during maturation slows aromatization and highlight the disadvantages of using solid bitumen Ro\u00a0for maturity calibration in liptinite-rich samples. Furthermore, our results indicate that use of Raman data obtained from liptinite-rich samples may also result in suppressed maturity indicators, particularly if the macerals are not identified prior to analysis.", "description": "104371, 12 p.", "publisher": { "@type": "Organization", "name": "Elsevier" }, "author": [ { "@type": "Person", "name": "Sanders, Margaret M.", "givenName": "Margaret M.", "familyName": "Sanders", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0003-3505-874X", "url": "https://orcid.org/0000-0003-3505-874X" }, "affiliation": [ { "@type": "Organization", "name": "Geology, Energy & Minerals Science Center", "url": "https://www.usgs.gov/centers/geology-energy-and-minerals-science-center" } ] }, { "@type": "Person", "name": "Jubb, Aaron M.", "givenName": "Aaron M.", "familyName": "Jubb", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-6875-1079", "url": "https://orcid.org/0000-0001-6875-1079" }, 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