Geochemical investigation of oils from Cretaceous to Eocene sedimentary sequences of the Abadan Plain,Southwest Iran |
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| Institution: | 1. Department of Geology, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Iran;2. Petroleum Geology and Geochemistry Research Centre, (PGGRC), Shahid Chamran University of Ahvaz, Iran;3. National Iranian Oil Company, Exploration Directorate, Tehran, Iran;1. Geology Department, Faculty of Applied Science, Taiz University, 6803 Taiz, Yemen;2. Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Géosciences Environnement Toulouse (GET), Observatoire de Midi-Pyrénées, Université de Toulouse, CNRS, IRD, F-31400 Toulouse, France;2. Group of Dynamics of the Lithosphere (GDL), Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, c Lluís Solé i Sabaris s/n, 08028 Barcelona, Spain;3. Institut des Sciences de la Terre Paris (iSTeP), Sorbonne Universités, UPMC Univ Paris 06, UMR 7193, F-75005 Paris, France;4. National Iranian Oil Company Exploration Directorate, 1st Dead-end, Seoul Street, NE Sheikh Bahaei Square, Tehran, Iran;1. Department of Geology, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Iran;2. Petroleum Geology and Geochemistry Research Centre (PGGRC), Shahid Chamran University of Ahvaz, Iran;3. National Iranian Oil Company, Exploration Directorate, Tehran, Iran;1. Department of Applied Geosciences and Geophysics, Montanuniversitaet Leoben, A-8700, Austria;2. Ukrainian State Geological Institute (UkrSGI), Chernigiv, Ukraine;1. Natural Resources Canada, Geological Survey of Canada, Calgary, AB, Canada;2. Department of Geoscience, University of Calgary, Calgary, AB, Canada;3. Tenure and Geoscience Branch, British Columbia Ministry of Natural Gas Development, Victoria, BC, Canada |
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| Abstract: | Oil samples from Lower Cretaceous to Eocene reservoirs in southwest Iran were analyzed using gas chromatography–mass spectrometry and gas chromatography–isotope ratio mass spectrometry for genetic classification of oil families and determining their maturity. The Studied oil samples are non-biodegraded and their gravity range from 18.3 to 37° API. The slight even/odd n-alkane predominance, coupled with low Pr/Ph values, suggests their likely source rocks with a predominance of algal organic matter, type IIS kerogen deposited under strongly reducing marine environments. The biomarker distribution of investigated oils is characterized by high concentration of both C29 and C30 hopanes and ratios of C29/C30H are generally greater than unity. There is a marked predominance of C29 regular sterane over C27 and C28 homologs in our studied oils. High sterane/hopane values and cross plot of the δ13C sat versus δ13C aro show contribution of marine organic matter. Medium value of gammacerane index and other salinity indices show water density stratification and high salinity conditions of the environment of deposition. It can be concluded that the studied reservoirs, due to their variable maturity have different API gravity and contain two oil families (types A and B) with latter being deeper and comprising more mature oils. |
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| Keywords: | Abadan Plain API gravities Stable carbon isotope Biomarker |
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