New aromatic biomarkers and possible maturity indicators found in New Albany Shale extracts |
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| Authors: | Mei-In M. Chou Karl V. Wood |
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| Affiliation: | 1. Geochemistry Section, Illinois State Geological Survey, 615 E. Peabody Drive, Champaign, IL 61820, U.S.A.;2. Engine/Fuels Laboratory, Chemistry Building, Purdue University, West Lafayette, IN 47907, U.S.A.;1. Corrosion Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India;2. Department of Chemistry, College of Science, Taibah University, Yanbu-30799, Al-Madina, Saudi Arabia;1. Radiation Physics Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt;2. Hot Laboratories Centre, Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt;3. Radiation Research of Polymer Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt;1. Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Separation Membranes and Membrane Processes, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China |
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| Abstract: | Aromatic hydrocarbons from benzene extracts of New Albany Shale were characterized. A biomarker that has a molecular weight of 546 and a structural configuration consistent with that of an alkyl-aromatic hydrocarbon (C40H66) was tentatively identified. It was found that the relative concentrations of the biomarker are indicative of differing levels of thermal maturity of the shale organic matter. A 40-carbon bicyclic carotenoid (C40H48) is proposed as the geochemical precursor of this biomarker. Thermal maturity of the shale organic matter can also be differentiated by observing differences in “fingerprints” as obtained by field-ionization mass spectrometry on the aromatic hydrocarbon fraction. Using this technique, we found that the more mature shale samples from southeastern Illinois contain more low molecular weight extractable aromatic hydrocarbons and the less mature shale samples from northwestern Illinois contain more high molecular weight extractable aromatic hydrocarbons. It was demonstrated that field-ionization and tandem mass spectrometric techniques through fingerprint and individual compound identification, are useful for shale aromatic hydrocarbon fraction characterization and for thermal maturation interpretation. |
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| Keywords: | New Albany Shale aromatic hydrocarbons carotenoids FIMS MS/MS biomarkers |
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