Markers for secondary reactions of migrated crude oil on carbonaceous surfaces |
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| Institution: | 1. Western Australian Organic and Isotope Geochemistry Centre (WA-OIGC), Department of Chemistry, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia;2. Department of Chemistry, University of Engineering and Technology, G.T. Road, Lahore, Pakistan;1. Institut de Minéralogie, Physique des Matériaux et Cosmochimie (IMPMC), UMR CNRS 7590, Sorbonne Université, Muséum National d''Histoire Naturelle, 57 Rue Cuvier, Case 52, 75231 Paris Cedex 5, France;2. LATMOS-IPSL, Université Versailles St-Quentin, Sorbonne Université, CNRS UMR 8190, 78280 Guyancourt, France;3. Institut de Planétologie et d’Astrophysique de Grenoble (IPAG), UMR CNRS 5274, Université Grenoble Alpes, 38041 Grenoble, France;4. Laboratoire Génie des Procédés et Matériaux (LGPM) CentraleSupelec, 8-10 Rue Joliot-Curie, 91190 Gif-sur-Yvette, France;1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China;2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;3. Unconverntional Natural Gas Institute, China Unviersity of Petroleum, Beijing 102249, China;4. Indiana Geological and Water Survey, Indiana University, 611 N Walnut Grove Ave., Bloomington, IN 47405, USA;5. Department of Earth and Atmospheric Sciences, Indiana University, 1001 E. 10th St., Bloomington, IN 47405, USA;6. Chevron Energy Technology Company, 1500 Louisiana St., Houston, TX 77002, USA;7. Research Institute of Petroleum Exploration & Development, China National Petroleum Corporation, Beijing 100083, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2. Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, PA 16802, USA;3. Sichuan Bureau of Coal Geological Exploration, Chengdu 610059, China;4. University of Houston, 4800 Calhoun Rd, Houston, TX 77004, USA;1. Department of Geosciences, Texas Tech University, Lubbock, TX 79409, USA;2. Department of Chemistry and Physics, West Texas A&M University, Canyon, TX 79016, USA;3. Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, CAS, Lanzhou 730000, China;1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China;2. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Branch Company, PetroChina, Korla, 841000, China |
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| Abstract: | A high abundance of ethyl substituted aromatic hydrocarbons (HCs) relative to their methyl counterparts is an unusual feature of some crude oils. Enhanced stability of ethyl aromatic HCs in the presence of tetralin was observed when individual ethylated compounds were heated with activated carbon in sealed tubes over a range of 170–340 °C. In addition, conversion of the common distribution of alkyl aromatic HCs to an unusual distribution, containing a higher relative abundance of ethyl compounds, was demonstrated by way of closed system heating of the aromatic fraction of a crude oil in the presence of activated carbon. The conditions for this unusual process require the presence of hydrogen donor components, which selectively limit the reaction and depletion of ethylated compounds relative to methylated compounds. The phenomenon has been shown to occur for substituted benzenes, naphthalenes, phenanthrenes and biphenyls. Enhanced abundance of ethyl aromatic HCs relative to their methylated counterparts is therefore proposed as an indicator for secondary reactions of migrated crude oil that has undergone thermal alteration after contact with carbonaceous surfaces in sediments. Application of these principles to selected crude oils and sediment extracts from the Carnarvon and Cooper/Eromanga Basins (Australia) indicates that significant secondary reaction of migrated crude oil has occurred. |
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