The current paper is based primarily on the interpretation of 2D seismic lines for the Amerasian Basin. A synrift complex has been identified in half-grabens almost everywhere within the Alpha-Mendeleev Rise and conjugate basins according to the results of seismic data interpretation. Various magmatism features within the synrift complex have been identified on seismic profiles: plateau basalts; sills and dikes; reflections similar to SDRs (Seaward Dipping Reflectors Sequences) and volcanoes. Regional extension and synchronous widespread magmatism are probably associated with the formation of the High Artic Large Igneous Province (HALIP) in the Aptian-Albian. Considering the data on the isotope ages of igneous rocks for the Mendeleev Rise, it is assumed that the top of the synrift complex has an approximate age of 100 Ma and the bottom has an approximate age of 125 Ma. The Alpha-Mendeleev Rise was formed simultaneously with conjugate basins in the Aptian-Albian. An axial line can be drawn along the Alpha-Mendeleev Rise. To the west of the axial line, reflections similar to SDRs dip towards the Podvodnikov basin. To the east of the axial line, reflections dip towards the Toll, Mendeleev, Nautilus and Stefansson basins. The reflections converge in the central parts of the basins. The Alpha Mendeleev Rise is a double-sided volcanic passive continental margin. The Podvodnikov, Toll, Mendeleev, Nautilus, and Stefansson basins are rift basins with thinned continental crust at the base. Their development was interrupted before the start of spreading and the oceanic crust formation.

The history of tectonic evolution in the north-eastern part of the Black Sea is considered mainly based on seismic data. The main unconformities surfaces are identified and related tectonic events in the Tuapse Trough, Kerch-Taman Trough, Anapa Swell, Shatsky and Andrusov Swells, Gudauta and the East Black Sea Depression are described. The tectonostratigraphic scheme was compiled during the research. Stratigraphic column for each structural zone provide a framework for understanding the history of each phase of basin evolution in the Late Mezozoic-Cenozoic time.

The results of a comprehensive study of the boundaries of the Turonian-Coniacian in the Upper Cretaceous deposits of the Abinsky region of the North-Western Caucasus, composed of rhythmically constructed carbonate strata of the hemipelagic type, are presented. Biostratigraphic analysis of foraminifera complexes made it possible to identify zones in the section that are comparable to those proposed for the Point of the Global Stratotype of the boundary of the Coniacian in Germany. On the basis of chemostratigraphic (isotopic) studies, the levels of abiotic events traced in the section and other territories have been established. The Shapsug section, after further study, can be proposed as a possible Hypostratotype (Limitotype) of the Turon-Coniacian boundary for the territory of the Russian Federation.

The issues of choosing the parameters of the exploration network based on quantitative criteria of exploration: the accuracy of the assessment of average grades and the error of geometrization are considered. Acceptable values of criteria for C1 category reserves are established based on the results of the analysis of actual data. The typification of gold deposits is based on an assessment of the scale of deposits, their morphology and fractal dimension; an assessment of the variability of gold grade in samples or composites is also used. To assess geometrization errors at the early stages of geological exploration, a method for determining them based on the positions of fractal geometry and on the results of geostatistical studies is proposed.

In this article, the possibilities of statistical analysis methods were demonstrated on the example of studying modern bottom sediments in the western part of the Barents Sea. As a result of cluster and dispersion analyses, regularities in the distribution of granulometric types of modern bottom sediments and organic carbon dissolved in them with depth within the sublittoral and bathyal zones of the sea were established. Based on the results obtained, it was concluded that the size distribution of sediments was due to the mechanical differentiation of sedimentary material as it was transported by sea currents, as well as the distance from the main sources of drift — Novaya Zemlya, the Kola Peninsula and Svalbard. At the same time, the accumulation of organic carbon in bottom sediments was associated with the peculiarities of the distribution of communities of marine organisms within the considered facies zones. The high content of organic carbon in the bathyal zone of the sea was associated with an increase in primary productivity here, as well as with the transfer by sea currents of the accumulated biogenic material of the littoral and sublittoral zones towards the bathyal.

With the goal to correlate the magnetostratigraphic data of the Eastern Paratethys obtained by researchers in different years a rockmagnetic and paleomagnetic investigations of the Tarkhanian sediments of the Skelya section was carried out. The main carrier of the natural remanent magnetization is titanomagnetite in the Argunian beds of the Tarkhanian regional stage; in addition to titanomagnetite there is iron sulfide (monoclinic pyrrhotite and/or greigite) in the deposits of the Terskian and Kuvinian beds. The paleomagnetic fold test of natural remanent magnetization directions, recorded in the rocks of the Argunian beds, is positive, which indicates a pre-folding age of the magnetization formation. A comparison with the magnetochronological scale GTS 2020 shows that the normal polarity interval in the lower part of the Argunian beds can presumably be compared with the С5Bn chron. The reversal polarity interval in the upper part of the Argunian beds is with C5ADr. The age of the С5Bn/C5ADr boundary can be estimated as ~14.7 Ma.

There were examined the issues of studying the features of the lithological and petrographic composition and the formation of oil deposits within the fields of the Surgut dome fold and the Frolov megadepression. It was noted that the formation of deposits of the sedimentary cover is associated with the peculiarities of the geological structure and the oil-bearing capacity of the basement rocks. In the considered territory, a high level of oil-bearing sedimentary cover is observed within the central part of the Surgut dome fold, and the deposits of the Pre-Jurassic part of the section can be additional sources of intensification of hydrocarbons in the Lower-Middle Jurassic deposits. The presence of zones of deep snaps is a search criterion for the detection of secondary reservoirs in them both — in destruction zones, basement, and in the Lower-Middle Jurassic deposits, therefore, deposits can be formed due to the vertically ascending migration of deep fluids through faults that cross the basement and horizons of the sedimentary cover.

There were examined the issues of the prospects for the oil and gas content of the Lower-Middle Jurassic deposits, which must be associated with both granitoid massifs and the details of identifying the conditions of sedimentation and the establishment of contact zones of the sedimentary cover with the underlying formations.

Based on the data obtained during the study of a representative collection of diamonds of the Ebelah placer by morphological analysis, luminescence, IR and EPR methods, a scheme for dividing crystals into three groups, presumably related to the primary sources of diamonds, is proposed. The separation is based on the statistical distribution of diamonds in the collection according to the content of A (IR) centers; the validity of the allocation of three groups is confirmed by the revealed differences in crystals of these groups in a significant part of typomorphic features, including habitus, surface morphology, color, visual luminescence, the presence of twins and accretions, the degree of mechanical wear, etc.

On the example of carbon-bearing formations, the concentration of a complex of trace elements in them is estimated. Examples are given of the distribution of productive continuous reservoirs in the Ordos (China), AustinChok, Bakken (USA) basins, as well as in the Domanik deposits of the Volga-Ural oil and gas basin. The features of the formations, namely the large length of the productive intervals of the section introduced into development during horizontal drilling, as well as the high concentration of ore metals and other environmentally hazardous chemical elements both in the shale deposits themselves and in shale oil, require a new approach to the study of shale deposits in all stages of geological exploration.

The article describes the effect of different physico-chemical factors on formation damaged caused by in-situ clay particles migration resulted from water injection into clastic reservoir.

. Developing of the exploration criteria for oil reservoirs and non-structural traps in the clinoform successions are the key target as for detailed field appraisal in the West-Siberia basin well as for exploration in the

clinoform complexes in the new sedimentary basins without drilling. Based on complex analysis of the seismic, well logs, well tests and core data in the northern Priobskoye field, the correlation between clinoform geometry, edge trajectory and distribution pattern of the reservoirs in the productive formation AS is established. The highest flow rates and reservoir properties are typical for bar deposits, proximal fan and slope channels. Deposits of bars are formed at the high stand system tract and at the beginning of the falling system tract on the edges of tangential clinoforms with gently ascending, flat and descending edge trajectory. Deposits of basin floor fans and slope channels are confined to the drop in the relative sea level and its low stand; it is advisable to search for them at the bottomset of tangential clinoforms with a descending edge trajectory and in gently cross-bedded clinoforms.

The article presents research of five different approaches to creating a low-frequency model of acoustic inversion of seismic data for Paleozoic deposits of the East Siberia. The paper include a brief overview of prior geology information. It also includes an analysis of acoustic inversion results for each low-frequency model. Comparison of acoustic impedances makes it possible to identify the most effective method of creating low-frequency model for Paleozoic interval.

The article presents corrected for the edge effects formula for the capacitance of a thin disk over a conducting plane, and offers a number of generalized expressions for assessing the transfer impedance of capacitive electrodes over ground with finite conductivity. It is shown that the transfer impedance of an insulated wire on the ground in a wide frequency range is described by the Cole-Cole formula with an exponent parameter from 0.9 to 1.

The paper is devoted to theoretical modeling of effective elastic properties of rock samples of domanik deposits. To determine the effective elastic properties of rocks, depending on their composition and morphological characteristics, the methods of effective medium theory were used. The aim of the work was to determine the parameters characterizing the microstructure of the investigated rock samples; creation of a seismic-geological model and calculation of reflection coefficients for it. The main attention in the work is paid to the influence of the content of kerogen and the degree of its maturity (porosity) on the measured physical quantities (velocities of elastic waves, reflection coefficients).

The interaction of organic matter with metal ions plays a key role in the migration of metals in aquatic ecosystems, the formation of natural water quality, toxicity and bioavailability of metals. Sunlight irradiation of swamp and river waters transforms dissolved organic matter, degrading it to low molecular weight compounds up to mineralization and simultaneously coagulating compounds >0.22 μm. As a result of the reduction and subsequent oxidation of Fe, as well as changes in its bond with organic matter, the formation of hydroxides of Fe(III) occurs. These hydroxides can form large, stabilized by organic ligands organo-mineral compounds >0.22 μm, with which Mn, Co, Cd can co-precipitate.

The biography and scientific achievements of Oleg Alexandrovich Mazarovich, Professor of the Department of Historical and Regional and the Department of Geology of Russia of the Geological Faculty of Moscow State University, a representative of the Russian geological dynasty Mazarovich, are considered.