1- M.Sc, Geological Operations, Exploration Management, National Iranian Oil Company, Tehran, Iran , a.saeedhosseini@gmail.com
2- -Head of Hydrocarbon Systems Studies, Exploration Management, National Iranian Oil Company, Tehran, Iran
3- M.Sc, Geological Studies, National Iranian South Oil Company, National Iranian Oil Company, Ahvaz, Iran
4- - Head of Geochemistry Studies, Exploration Management, National Iranian Oil Company, Tehran, Iran
2- -Head of Hydrocarbon Systems Studies, Exploration Management, National Iranian Oil Company, Tehran, Iran
3- M.Sc, Geological Studies, National Iranian South Oil Company, National Iranian Oil Company, Ahvaz, Iran
4- - Head of Geochemistry Studies, Exploration Management, National Iranian Oil Company, Tehran, Iran
Abstract: (99 Views)
Oil shales, as an important hydrocarbon source, require careful investigation in terms of the distribution of various elements. Geochemical models are a powerful tool for understanding the distribution of elements and the factors affecting them, and help optimize the exploration and exploitation of these resources. Therefore, in this study, to determine the distribution of various elements in sedimentary deposits containing oil shales, the main focus has been on the effect of oxidation-reduction conditions and climate of the source rock formation environment. For this purpose, to evaluate the deposits around the Qolyan River in the Qalikuh region of Lorestan, 15 surface samples were taken from these deposits and subjected to XRD and ICP analyses. Also, 80 thin microscopic sections were prepared for petrographic examination. Rock-Eval Pyrolysis analysis was also performed to determine the total organic matter content of oil shale samples. The results of geochemical models showed that detrital minerals and carbonate minerals are the main minerals in the aforementioned deposits. These deposits are equivalent to intermediate-intermediate felsic igneous rocks and are located in the arkose, litharnite, and shale ranges, which were formed in a subduction and collisional environment. The average values of weathering indices and oxidation-reduction condition determination indices confirm the relatively mild weathering of the deposits, which are located in the dry climate zone and, with little maturity, have not yet reached the sedimentary cycle and were formed in a reduction environment. The main factors of geochemical changes in this study are: Weathering rate , Zircon mineral (rare earth elements and minor elements such as: Th, Zr, Nb, Ta), Development of total organic matter in oil shales under environment of reduction conditions , Dispersion of clay minerals , Adsorption-repulsion phenomena and substitution of ions (Sr), Alteration (Rb).
Keywords: geochemical models, oil shales, oxidation-reduction, minor and rare earth elements, weathering
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