Tricyclic terpane maturity parameters: response to heating by an igneous intrusion |
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| Institution: | 1. Geological Survey of Canada, 3303 33rd Street, NW, Calgary, Alberta, Canada;2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China;1. Faculty of Geosciences, Shahid Chamran University, Ahwaz, Iran;2. Department of Earth Science, Faculty of Natural Science, University of Tabriz, Tabriz, Iran;3. School of Geology, University College of Science, University of Tehran, Tehran, Iran;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. College of Geosciences, China University of Petroleum, Beijing 102249, China;3. Huabei Oilfield Company of PetroChina, Renqiu 062552, China;4. College of Sciences, China University of Petroleum, Beijing 102249, China;1. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210023, China;2. Division of Fengcheng Oilfield Production, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 843000, China;3. Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 843000, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China;2. University of Geosciences, Beijing 100083, China;3. Xinjiang Petroleum Institute, PetroChina, Karamay 83400, China;4. Exploration & Production Research Institute, Sinopec, Beijing 100083, China |
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| Abstract: | The effects of thermal maturation upon the abundance and composition of the tricyclic terpanes have been investigated within a single sedimentary horizon within the Dun Caan Shale Member (Isle of Skye, Scotland) intruded by a 0.9 m thick Tertiary dolerite dyke. Heating by the igneous body caused the concentrations of all 13β(H),14α(H) and 13α(H),14α(H) tricyclic terpanes to increase towards or within the effective ‘oil window’, recording generation from abundant non-hydrocarbon precursors, such as kerogen- and asphaltene-bound components. Progressive changes in tricyclic terpane composition accompany these concentration changes. An increase in the C23 βα/αα maturity parameter towards the dyke resulted from the relatively greater rate of generation of the βα isomer, combined with the earlier decline in concentration (by degradation or isomerisation) of the αα component. The tricyclics/(tricyclics+hopanes) parameter shows a dramatic increase within the latter part of the oil window, due to the greater relative thermal stability of the tricyclic terpanes. The quantitative data demonstrate the importance of the processes of generation (from non-hydrocarbon fractions of the sedimentary organic matter) and thermal degradation in the operation of tricyclic terpane maturity parameters. |
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