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The features of organic matter composition of petroleum source rocks belonging to Kazanian-Tatarian interval are described. Autochthonous and allochthonous bitumoids, the types of distribution of bitumoids and their reparations area are identified. Comparison of petrographical and geochemical studies with data about the catagenetic transformation of organic matter belonging to the terrigenous section is carried out.
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O.S. Kotik (2016) studied this question.
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