Litologiâ i poleznye iskopaemyeLitologiâ i poleznye iskopaemyeЛитология и полезные ископаемые0024-497X3034-5375The Russian Academy of Sciences65845410.31857/S0024497X2370012XBMNKHPArticlesСтатьиStructural and Сrystal-Сhemical Features of Mixed-Layer Illite-Containing Minerals from Diagenetically Altered Upper Jurassic Oil Source RocksСтруктурно-кристаллохимические особенности смешанослойных иллит-содержащих минералов из катагенетически измененных верхнеюрских нефтематеринских породDritsV. A.ДрицВ. А.victor.drits@mail.ruSakharovB. A.СахаровБ. А.sakharovba@gmail.comZviaginaB. B.ЗвягинаБ. Б.zbella2001@yahoo.comGeological Institute RASГеологический институт РАН01052023321522920022025Copyright ©; 2023, Russian Academy of SciencesCopyright ©; 2023, Российская академия наук2023Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0024-497X/article/view/658454

Illite-smectite (I-S) minerals from the Upper Jurassic oil-bearing rock shales of Denmark and the North Sea were studied by a complex of diffraction and spectroscopic methods. Detailed structures were identified to reveal the mechanism of diagenetic transformation of these shales. Usually, in oil-bearing rocks of sedimentary basins, oil generation occurs simultaneously with the I-S diagenetic transformation. The results obtained demonstrate the relationship between these two reactions: NH3 molecules released from kerogen during ma-ximum oil formation are fixed as NH4 ammonium cations in smectite or vermiculite interlayers, forming mica or tobelite structural fragments. As a result of this solid-phase transformation, mixed-layer structures are formed, consisting of layers of illite, tobelite, smectite and vermiculite (I-T-S-V).

Иллит-смектитовые (I-S) минералы из верхнеюрских нефтеносных сланцев Дании и Северного моря были исследованы комплексом дифракционных и спектроскопических методов. Детальные структуры были определены для выявления механизма постседиментационной трансформации этих сланцев. Обычно в нефтеносных породах осадочных бассейнов генерация нефти происходит одновременно с диа- и катагенетической трансформацией I-S. Полученные результаты демонстрируют связь между этими двумя реакциями: молекулы NH3, освобождаемые из керогена во время максимального нефтеобразования, фиксируются как катионы аммония NH4 в смектитовых или вермикулитовых межслоях, образуя структурные фрагменты слюды или тобелита. В результате этого твердофазового преобразования формируются смешанослойные структуры, состоящие из слоев иллита, тобелита, смектита и вермикулита (I-T-S-V).

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