Bezruchko K.А., Pimonenko L.I., Kuznetsova L..D., Drozhzha T.M. Mineral changes in the rocks as indicators of catagenesis transformations of carboniferous stratum

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Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 140

Geoteh. meh. 2018, 140, 91-105

DOI: https://doi.org/10.15407/geotm2018.03.091

MINERAL CHANGES IN THE ROCKS AS INDICATORS OF CATAGENESIS TRANSFORMATIONS OF CARBONIFEROUS STRATUM

¹Bezruchko K.А., ¹Pimonenko L.I., ¹Kuznetsova L..D., ¹Drozhzha T.M.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC552.122.002.23

Language: Russian

Abstract.

Petrographic researches of mineral composition of sedimentary rocks in Donbas carboniferous stratum were conducted. Samples taken from the mines and samples taken from exploratory boreholes in the Donetsk-Makiivka, Pokrovsk (former Chervonoarmiysk), Lysychansk, South-Donbas, Bokovo-Hrustalnyy, Torezs-Snizhnyansk, Аlmazno-Маriivska and Krasnodon geological-industrial districts were studied. Rocks containing coals in a range from jet coal to anthracite were researched. New data about mineral composition of the carboniferous stratum rocks of different degree of cata- and metagenesis were obtained. The features of mineral changes in sandstones and clay rocks depending on the stage of their post-diagenetic transformations were specified (explored and described) by new petrographic data. It is shown that upper boundary of the late catagenesis stage consists of transformations of the clay-hydromicaceous aggregate of rocks cement into cleanly hydromicaceous and disappearance of montmorillonite. Upper boundary of the deep catagenesis includes transition of rocks containing coal grades OS, T → A, i.e. transition of the low temperature micas polytype 1М to high temperatures 1М₁. These transformations are mostly significant in litotype argillite → mica shales, where hydromicaceous-micaceous composition is transformed into monomineral muscovite. In sandstones, it is the autometasomatism substitutions of cement by macrocrystalline calcite (the structure of «fontenblo type»). Sharp transformation of mica and calcitezation of rocks containing anthracites, are the evidences of the sharp "jump" of conditions, at which anthracitezation of bituminous coals has happened. On the basis of specified minerals-indicators and the studied mineral transformations in the host rocks, it is possible to make a conclusion about the coal composition by grades and commercial gas content in the investigated districts, i.e. to forecast gas saturation of the massif and probable formation of free methane accumulations. The sharp increase of gas content in the coal beds is related to the upper boundary of late catagenesis (gas-coal grade) and their transition to the category of outburst-prone strata.

Keywords: Donbas, carboniferous strata, sedimentary rocks, petrographic composition, catagenesis, metagenesis.

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About the authors:

Bezruchko Kostiantyn Andriivych, Doctor of Geology Sciences (D.Sc), Senior Researcher, Head of Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Pymonenko Ludmila Ivanivna, Doctor of Geology Sciences (D.Sc), Principal Researcher of Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kuznetsova Lubov Dmytrivna, Master of Science, Chief Technologistin the Department of Geology of Coal Beds at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Drozhzha Tetiana Mykhailivna, Master of Science, Principal Engineer in the Department of Geology of Coal Beds at Great Depths, N.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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