T.B. Mikerina

 

Sedimentation cycles and regularities of organic matter accumulation in Mesozoic and Cenozoic deposits of Western Ciscaucasia and north-western Caucasus

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DOI 10.31087/0016-7894-2019-2-73-83

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The paper discusses distribution of the dispersed organic matter in the Mesozoic and Cenozoic deposits of the western Caucasus. Composition and content of dispersed organic matter, features and patterns of its distribution determine generation of oil potential of formations and, therefore, oil and gas fields. Basing on the large amount of data (more than 2000 samples) on the dispersed organic matter content in Mesozoic and Cenozoic deposits, the authors substantiate the cyclicity of its accumulation in the western Ciscaucasia and north-western Caucasus. To date, cycles have been recorded in any natural processes, including geological ones, which made it possible to associate large- and small-scale sedimentation cycles identified in accordance with the dispersed organic matter content with the natural geological cycles (M. Bertrand, J. Phillips et. al) of IV, V, VI, and VII classes. History of geological evolution of the western Caucasus region reflects an existence of geological sedimentary cycles (mega-, macro-, and micro-cycles) in the Earth evolution and sedimentary rocks formation, as well as change of sedimentation regimes and conditions of dispersed organic matter accumulation. The most intensive oil generation stage in the J. Phillips Mesozoic macro-cycle belongs to the middle of the cycle – in the Middle Jurassic; the similar cycle in Cenozoic also belongs to the middle of the cycle – in the Upper Oligocene.

 

Key words: cyclicity; transgressive-regressive cycles; geological cycles; dispersed organic matter; stages of oil generation; sedimentation; Mesozoic and Cenozoic deposits; main zone of oil and gas generation.

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For citation: Mikerina T.B. Sedimentation cycles and regularities of organic matter accumulation in Mesozoic and Cenozoic deposits of Western Ciscaucasia and north-western Caucasus. Geologiya nefti i gaza. 2019;(2):73–83. DOI: 10.31087/0016-7894-2019-2-73-83.

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T.B. Mikerina   Scopus

Kuban State University, Krasnodar, Russia;

bitumoid@bk.ru