Benzo[b]naphthothiophenes and alkyl dibenzothiophenes: Molecular tracers for oil migration distances |
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| Institution: | 1. State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum, Beijing, 102249, China;2. CSIRO Earth Science and Resource Engineering, Bentley, WA6102, Australia;3. Central Energy Resources Science Center, US Geological Survey, Denver, 80225, USA;1. Mechanical Engineering Department, Center for Advanced Coating Technologies, University of Toronto, ON, Canada;2. National Research Council of Canada, Industrial Material Institute, Boucherville, QC, Canada;1. Langfang Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China;2. Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, China;3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 100429, China;4. CSIRO Energy Business Unit, North Ryde, NSW 2113, Australia;1. School of Geoscience, China University of Petroleum, Changjiang West Road 66, Huangdao District, Qingdao, Shandong 266580, China;2. State Key Laboratory of Petroleum Resources and Prospecting, Faculty of Natural Resources and Information Technology, China University of Petroleum, Beijing 102249, China;3. Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oil & Gas Field Company, CNPC, Chengdu 610000, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 10083, China;2. Beijing Research Institute of Uranium Geology, Beijing 100029, China |
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| Abstract: | The secondary migration of petroleum is one of the most critical geological processes responsible for the accumulation of hydrocarbons in a sedimentary basin. Pyrrolic nitrogen compounds such as carbazoles and benzocarbazoles are thought to be practical molecular indicators for estimating relative migration distances of oil. In light oils or condensates, however, considerable analytical errors are usually caused by low concentrations of NSO-compounds. Here we show that polycyclic sulfur aromatic hydrocarbons such as dibenzothiophene, C1～C3 alkylated dibenzothiophenes and benzob]naphthothiophenes, which are present in relatively higher concentrations than the pyrrolic nitrogen compounds, exhibit changes in both absolute and relative concentrations that correlate with migration distances. The polycyclic sulfur aromatic hydrocarbons related parameters — benzob]naphtho2,1-d]thiophene/{benzob]naphtho2,1-d]thiophene + benzob]naphtho1,2-d]thiophene} (abbreviated as 2,1]BNT/(2,1]BNT+1,2]BNT) and the concentration of total dibenzothiophenes plus benzob]naphthothiophenes — are proposed by this paper to trace the oil migration distances. |
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| Keywords: | Dibenzothiophene Benzonaphthothiophene Migration Distance |
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