Литология и полезные ископаемые, 2023, № 3, стр. 215-229

Структурно-кристаллохимические особенности смешанослойных иллит-содержащих минералов из катагенетически измененных верхнеюрских нефтематеринских пород

В. А. Дриц a*, Б. А. Сахаров a**, Б. Б. Звягина a***

a Геологический институт РАН
119017 Москва, Пыжевский пер., 7, стр. 1, Россия

* E-mail: victor.drits@mail.ru
** E-mail: sakharovba@gmail.com
*** E-mail: zbella2001@yahoo.com

Поступила в редакцию 12.09.2022
После доработки 08.12.2022
Принята к публикации 09.01.2023

Аннотация

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).

Ключевые слова: нефтематеринские породы, диагенез–катагенез cмешанослойных минералов, иллит-тобелит-смектит-вермикулит, кристаллохимические особенности cмешанослойных минералов, твердофазовые преобразования.

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