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The article presents the results of coal petrological and pyrolytic (Rock-Eval) research of Kazan-Tatar deposits in north of the Pre-Ural foredeep which is very important to evaluate the oil and gas potential of the region. The main components in the composition of organic matter are macerals component of vitrinite group. The high content (up to 30%) of liptinite components is in the deposits of lagoon and lake-swamp depositional environments which are located in the southeast of Korotaikhinskaya depression and connection area of Chernyshev ridge with Kosyu-Rogovskaya depression. According to coal petrography the catagenesis transformation of organic matter in Kazan-Tatar deposits has gradation PC₃ — MC₁ (R_o < 0.5) in the largest part of the study area. The maturity level of organic matter increases to gradations MC3 (R_o > 0.85) within Korotaikhinskaya depression. Pyrolytic method established that deposits with low hydrocarbon potential (HI < 100 mg HC / g _TOC) were prevalent in the territory. High values of hydrogen index (HI > 150 mg HC / g _TOC) are locally in the Korotaikhinskaya depression and connection zone of Chernyshev ridge with Kosyu-Rogovskaya depression, which is associated with an increase of liptinite components in organic matter.

Keywords: Permian coal-bearing deposits, organic matter, coal petrography, catagenesis, hydrogen index, generation potential.

DOI: 10.19110/2221-1381-2016-11-3-9

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Results of palaeontological, biogeochemical and sedimentological studies of Silurian strata in the western Subpolar Urals and on the Chernyshev Swell revealed that assignment of the Marshrut Regional Stage and the lower part of the UstDurnayu Regional Stage to Wenlock, as it is indicated in the latest stratigraphical scheme, is not correct. Disappearance of the conodont Apsidognathus and appearance of brachiopod Spirinella nordensis indicate that the Llandovery—Wenlock boundary lies in the middle part of the UstDurnayu Regional Stage. Comparative analysis of palaeontological and lithological data from the Subpolar Urals, Estonia and Severnaya Zemlya suggest that the strata corresponding to the lowermost Wenlock are missing in the study region. The gap recognized divides the UstDurnayu Region Stage in two, lower and upper parts. Here, we propose to include the lower part of the stage into the Marshrut Regional Stage (as its upper part), to rename the upper part of it as Vojvyv Regional Stage, and not to use the name UstDurnayu for a regional stage in future.

Keywords: stratigraphical scheme, Llandovery, Wenlock, Vojvyv Regional Stage, brachiopod, conodont.

DOI: 10.19110/2221-1381-2016-11-10-14

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The article presents the results of lithological and geochemical research of Silurian deposits in the Talbeysky block of Chernyshev ridge, which are one of the important objects to exploration for hydrocarbon deposits. Based on the structure and lithological composition of the deposits three series were defined in wells section: sulphate-carbonate, carbonate and argillo-carbonate. The Lower Silurian sulphate-carbonate and carbonate series contain mostly poor source rocks (TOC < 0.3 %, HI — 4—173 mg HC/g TOC). The Upper Silurian argillo-carbonate series contain the source rock with fair and good petroleum potential (TOC — 0.5—6 %, HI — 224—580 mg HC / g TOC). The bitumen contents increases from carbonate to argillo-carbonate rocks and varies 0.01—0.02 % and 0.03—0.16 %, respectively. The distributions of n-alkanes and isoprenoids in the hydrocarbon fraction of the studied bitumens show a marine sapropel organic matter in the initial biomass. The maturity of organic matter in Silurian deposits is main oil generation zone and varies on the studied area, ranging from gradations MK_1-2 in the north to MK_2-3 in the southern part of Talbeysky block.

Keywords: Silurian deposits, organic matter, generation potential, bitumens, n-alkanes.

DOI: 10.19110/2221-1381-2016-11-15-22

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We studied the possibility of production of ashless coals (hypercoals) from raw of Intinskaya mine. To study the formation conditions of the initial coals by gas chromatography and gas chromatography-mass spectrometry we studied the composition of biomarkers hydrocarbons of saturated fraction of bitumen. The presence of high concentrations of C₂₉ steranes, C₂₇—C₂₉ n-alkanes indicates a significant contribution of terrigenous vegetation in the initial biomass composition; for a number of samples the presence of high concentrations of C₂₃—C₂₅ n-alkanes can be an attribute of the contribution of aquatic vegetation in the initial biomass composition. To produce hypercoals the initial coal concentrates were extracted with N-methylpyrrolidone at boiling. To characterize the product, obtained after distillation of the solvent, we used solid state NMR spectroscopy. The analysis of CP/MAS spectra, and also the results of the editing of the spectra showed that the obtained hypercoals are little different from the initial coals by their organic matter structure. At that they are characterized by an insignificant increase of aliphatic component and presence of amido groups conditioned by the interaction with the solvent.

Keywords: coal, Intinskaya mine, biomarkers, hypercoal, solid state ¹³C NMR.

DOI: 10.19110/2221-1381-2016-11-23-30

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We analyzed the mineral resource base of the Arctic zone of the Timan-Northern Ural region, including Vorkuta area, Komi Republic, Nenets Autonomous District, Vaygach Island, Novaya Zemlya archipelago. We presented data on the main mineral resources — oil and gas, energy and coking coals, lead-zinc, manganese, copper, chromium, barite ores, gold, fluorite. We showed that together with oil, gas and coal deposits the Khoylinskoe barite, Pavlovskoe lead-zinc, Amderminskoe fluorite deposits could be involved into the development. We determined promising, but still poorly studied areas, which are interesting for different minerals. For the first time we carried out the evaluation of minerals. The resources and reserves of oil and gas, coal, lead, zinc, manganese and chrome ores were the most valuable. The arctic zone of the Timan-Northern Ural region is characterized by considerable resource and value potential and deserves a great attention during the development of Russian Arctic and Subarctic regions.

Keywords: Arctic, Northern Timan, Polar Urals, Pay-Khoy, Novaya Zemlya, Vaygach Island, oil, gas, coal, ore deposits, evaluation.

DOI: 10.19110/2221-1381-2016-11-31-39

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The article is devoted to obtaining of the new information in the development nanomineralogy ideas for functional materials. We performed the synthesis of the titanosilicate natisite Na2TiSiO5, which was special as material with Na+-ion conductivity suitable for preparing hi-tec ceramics. As the main synthesis method was chosen natisite autoclave hydrothermal synthesis, using as precursors the products of ammonium fluoride processing of the leucoxene Yarega deposit, allowing in the future to solve the problem of complex processing of mineral raw materials is important for the Komi republic. We found out that increasing synthesis time from six to twenty-four hours results in a pure natisite phase after a paranatisite phase. Nanoscale morphological characteristics for all powders were defined by the method of atomic force microscopy (AFM). We showed that the samples after six hours exposition are rough not only at micro-, but also at nanoscale. It is possible that these powders will be used as sorbents with the maximal surface area of composing particles. According to AFM the samples after twenty-four hours exposition represented well formed crystalline growth twins of cross type with practically smooth pinacoid surfaces and rare microscale inclusions. Nanoscale roughness on the flat areas was not determined for the samples of this powder. The ceramics, produced from such particles, should possess the highest ion-conductive characteristics.

Keywords: leucoxene, titanosilicates, surface nanomorphology.

DOI: 10.19110/2221-1381-2016-11-40-45

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We conducted statistical estimation of difference in amino acid composition of natural carbonaceous materials, previously divided on the basis of physical and chemical features into groups according to Uspensky classification, by discriminant analysis. The samples of natural solid bitumens from a carbonization sequence (asphaltites — kerites — anthraxolites), natural graphites, and carbon black samples were used as objects of the research. It was shown that the samples within each group had similar amino acid composition and the correctness of an initial distribution of the samples into groups was confirmed. In addition, we found individual samples, which had been incorrectly classified as a result of inaccurate physical-chemical diagnostics, and also slightly different from the samples of their group by the geological and geochemical characteristics. This indicates possibility of using discriminant analysis for the comparative grouping of natural carbonaceous substances by amino acid composition.

Keywords: discriminant analysis, discriminant variables, canonical discriminant functions, natural carbonaceous substances, amino acids.

DOI: 10.19110/2221-1381-2016-11-46-53

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