PAH refractory index as a source discriminant of hydrocarbon input from crude oil and coal in Prince William Sound,Alaska |
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| Institution: | 1. Chemistry Institute, University of Campinas, PO Box 6154, 13083-970 Campinas, SP, Brazil;2. Faculdade de Geologia, Instituto de Geociências, Universidade Federal do Pará, Rua Augusto Corrêa 1, Guamá, 66075-110 Belém, PA, Brazil;3. Petrobrás/Cenpes/PDGEO/GEOQ, Av. Horácio Macedo 950, Cidade Universitária-Ilha do Fundão, 21941-915, Rio de Janeiro, RJ, Brazil;1. UoN Chair of Oman''s Medicinal Plants and Marine Natural Products, University of Nizwa, PO Box 33, Birkat Al Mauz, Postal Code 616 Nizwa, Oman;2. Department of Biological Sciences and Chemistry, College of Arts and Sciences, University of Nizwa, Birkat Al-Mouz, Nizwa 616, Sultanate of Oman;1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, PR China;2. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, PR China;3. Department of Geoscience, University of Calgary, Calgary, Alberta T2N 1N4, Canada;4. National Energy Heavy Oil Exploitation R&D Center, Petro China Liaohe Oilfield Company, Panjin, Liaoning 124010, PR China;1. WA Organic and Isotope Geochemistry Centre, The Institute for Geoscience Research, Department of Chemistry, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;2. School of Chemistry and Biochemistry, University of Western Australia, Perth, WA 6009, Australia;3. Department of Earth Sciences, Natural History Museum, Cromwell Rd., London SW7 5BD, United Kingdom;1. Department of Earth Sciences, University of California, Riverside, CA 92521, USA;2. Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA |
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| Abstract: | Geochemical correlation and differentiation of hydrocarbons from crude oils and coals is difficult. The complex mixture of the hydrocarbon constituents and the dynamic nature of these constituents in the environment as they weather contribute to this difficulty. A new parameter, the polycyclic aromatic hydrocarbon (PAH) refractory index, is defined here to help in this correlation. The PAH refractory index is a ratio of two of the most refractory constituents of most crude oils, namely triaromatic steranes and monomethylchrysenes. These are among the most persistent compounds in oil after deposition in the environment and thus retain reliably the signature of the original petroleum input. This index is utilized in Prince William Sound (PWS) to differentiate three different oils, as well as to provide evidence that coal, not oil, is the dominant source of the PAHs which are prominent constituents of marine sediments from PWS and the Gulf of Alaska. |
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