The results of scientific and educational activities of the Department of Engineering and Ecological Geology in 2008-2017, its structure, scientific and organizing activities, information about state and public recognition of the Department's members works are characterized.

2D and 3D thermal history and organic matter maturity modeling of East Siberian Sea sedimentary basinsare performed in this study. We present cross-sections with temperature and vitrinite reflectance distribution along composite seismic line, temperature maps ofmain horizons fordifferent time stages. Vitrinite reflectance maps of source rocks fordifferent time stages and transformation ratio maps of source rocks for present time are also presented. Maturation history and possibilities of hydrocarbon generation were analyzed using modeling results.

The Navysh volcanic complex is a part of the Aisk suite (Lower Riphean). It deposits on the Archean-Early Proterozoic metamorphic rocks of the Taratash complex. It is represented mainly by trachybasalts, as well as by dacites and metasomatic bostonites. For the first time, several series of volcanics have been identified, which differ in the content of TiO₂ and in some incompatible elements. The metasomatic nature of bostonites is proved. The reasons for excluding dacites from the composition of the complex are given.

In the work the composition of nearly 70 naturally-quenched olivine-, plagioclase-, clinopyroxene and orthopyroxene-hosted melt inclusions from tephra of Simushir island (Central Kuriles) was studied. For the inclusions measurements of main petrogenic components, H₂O, S and Cl were conducted. Reconstructed melts contain 48,6-78,4 wt.% SiO₂, 0,3-8,26 wt.% MgO and 0,12-1,72 wt.% K₂O. Content of S and Cl in melts changes naturally with increasing of SiO₂: S - from 0,14 to 0,02 wt.% and Cl - from 0,05 to 0,28 wt.%. Water content in parental melts is 4,2-4,5 wt.%.

Composition and origin of deposits belonging to Bedenekyr Formation of the Mountainous Crimea based upon generalizations of our own results and analysis of published and unpublished data were specified.

Based on the experience of developing an oil fieled on the Caspian Sea shelf, which was initially operated with injection of seawater into oil-bearing seams to maintain reservoir pressure, a forecast was made for the deposition of sulfate salts in reservoir conditions. The forecast of sulphate deposition is carried out in two ways: analytical calculations by the method of J.E. Oddo and M.B. Thomson and computer modeling. The prognosis took into account the strontium content in the reservoir waters of the deposit, which is usually ignored in oilfield practice. It has been established that computer modeling gives a more accurate prediction, in particular, considerably expands the temperature limits of anhydrite precipitation. The determination of the amount of potentially sulphate salts potentially found in computer simulations has shown that the mass of deposited calcium and strontium sulfates is large enough that it can significantly reduce the permeability of the reservoir.

The experimental results on the synthetic oil production from Domanik Formation rocks under hydrothermal conditions are given. Oil fractions extracting potential of the rocks under hydrothermal was shown to be up to 60 mg/g or 6,0 wt.%. Inorganic additives (sodium carbonate or silica) incorporation does not influence on the oil recovery factor. Meanwhile the amount of recoverable oil products depends on the mineral composition of the rock. The dependence between the percentage of hydrocarbons emission and mineral composition of the rocks was determined. Clay minerals and silica increase the yield of synthetic oil, carbonates, conversely, inhibit the process.

The experiments on studying leaching of trace elements (Li, Rb, Cs, Sr, Ba, V, Mn, Fe, Co, Ni, Cu, Tl, Y, La, Ce, Th, U) from unaltered ash of the Karymsky volcano (Kamchatka) under its interaction with 0.01 M solutions of oxalic, salicylic, tartaric, citric, and acetic acids at the different solid/liquid phases mass ratio were lead. Based on the obtained data it is drawn a conclusion that mobilization of trace elements occurs mainly as a result of demolition of crystal structure of rock-forming minerals, as well as (in case of oxalic acids) at reduction of Fe(III) and Mn(IV) oxyhydroxides to soluble Fe(II) and Mn(II) compounds. Organic complexes formation increases of the metals stability in solution and provides a possibility of achievement of much higher values of the dissolved forms concentration than for the lack of organic ligands.

A theoretical evaluation of the scale effect in dispersed soils is considered in the engineering-geological study of various physical and physical-mechanical properties that depend on the structural inhomogeneity of the soil. Concepts and new quantitative indicators are proposed to evaluate the manifestation of the scale effect in disperse soils in relation to physical and physical-mechanical properties. A classification of structural heterogeneitysin disperse soils that affect the scale effect in them has been developed. The method for analyzing the scale effect in dispersed soils is described on the basis of the superposition principle. The theoretical model of registration of the scale effect in disperse soils is substantiated at an engineering-geological evaluation of various physical and physical-mechanical properties.

The article discusses of the microstructure clay soils transformation during their deformation under triaxial compression conditions. Proposed multifaceted methodology for the numerical description of changes in the structural features of clay soils during deformation under triaxial compression conditions. The research results allow to conclude that major transformation in the structure of the sample develop at the time of deformation instability occurs. These modifications include the redistribution of the pore space and marked orientation of the structural elements of the soil. Further deformation of soil does not change the ratio of the number of pores, but the orientation of the structural elements increases throughout the deformation process.

Syngenetic ice wedges have been investigated in the Ayon Island. Their isotopic composition, geochemical characteristics of both ice wedges and enclosing sediment have been obtained; four ice-wedges stages have been distinguished. Paleo temperature reconstructions for Ayon Island and adjacent territories of northern Chukotka have been yielded at the basis of these results. It is observed almost identical trends in the distribution of ice-wedge isotopic characteristics in the island and in the lower reaches of the Kolyma River, as well as differences in the magnitude of isotopic oscillations during the transition from Late Pleistocene to the Holocene as compared to ice-wedges of the Lower Kolyma region.

The article presents the results of long-term field studies of methane in the upper part of permafrost for the different geomorphological levels of Central Yakutia. Patterns of spatial distribution of methane content across different landscapes were found. The highest concentrations of methane are found in alas deposits, the major role of methane in the conservation there goes to the moment of freezing the thermokarst lake draining. The difference in methane content in the sediments of the Late Pleistocene Ice Complex on the left and the right bank of the river Lena was identified. That is likely caused by the conditions of ice complex formation.