High-carbon rock release in deposits of Triassic and Jurassic periods in Western Siberia by lithogeochemical research of super-deep well SG-7 section
The relevance of research is caused by the need to obtain additional geological information on oil deposits of Triassic and Jurassic periods in Western Siberia uncovered by super-deep well SG-7. The main aim of the study: to identify high-carbon rocks in a section of a super-deep well SG-7 by modern...
| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
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Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/1396 |
| Summary: | The relevance of research is caused by the need to obtain additional geological information on oil deposits of Triassic and Jurassic periods in Western Siberia uncovered by super-deep well SG-7. The main aim of the study: to identify high-carbon rocks in a section of a super-deep well SG-7 by modern techniques. The methods used in the study: lithological, petrographic, nuclear and geochemical methods. On their basis the authors have studied the collections core and super-deep well SG-7 rocks. 606 samples were investigated under binocular microscope and in petrographic sections. The same amount of uranium and alumina concentration was measured by nuclear and physical methods that displays geochemical features of rocks. The results obtained were investigated considering landscape facies of sediment genesis and geochemical fatsias of diagenesis. The table shows the relation of deposits age and the names of suites and formations, intervals of their occurrence; it indicates the quantity of the samples analyzed and the tests representing them. The analysis of the data in the table allows making conclusions on conditions of forming deposits opened with a super-deep well. These are the landscape facies: continental, transitional to the sea - lake, lake and marsh, deltoid, river-bad, coastal and sea, lagoon, transitional to sea and pseudoabyssal, and geochemical ones: with changing oxidation-reduction mode of diagenesis - from oxidizing to extremely reducing. The latter are typical for burring organic substance and subsequent formation of high-carbon rocks. It was ascertained that the rocks of Tyuryakhin (Triassic) and Bazhenov (top Jurassic) formations accumulating carbon substance and uranium are formed in conditions of arid sediment genesis and situations of diagenesis extremely reducing fatsias. Results: The authors determined the borders and conditions of generating high-carbon rocks of Tyuryakhin (Triassic) and Bazhenov (top Jurassic) formations. |
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| ISSN: | 2500-1019 2413-1830 |