Insoluble remains of Lower Permian sylvinite rocks in the western and north-western framing of the Caspian depression

The paper presents the results of a study of the insoluble residue of sylvinites and sylvin-halite rocks of the Lower Permian halogen formation, common within the Perelyubsky areas (Western and Eastern), promising for industrial development (Saratov Region) and the Gremyachinsky potash deposit (Volgograd Region). A technique for studying the insoluble residue of sylvinites is presented. The types of insoluble residue are distinguished according to the form of occurrence in sylvinites and its mineral composition is characterized.

Irrigation system in the Late Cretaceous Hexactinellids (Porifera, Hexactinellida)

Within the skeletal structure of the medium- and the thick-walled Hexactinellids, the active filtration surface area was increased at expense of the elements of the irrigation system. The ostia and the transversal canal structures, the densities of their occurrences correlate with the values of the wall thickness, the skeleton habitus, the level of modular organization; they are in many ways determined by the parameters of the sponge habitats.

On the role of salty coals in kaolinite transformation into paragonite-type hydromica within the Donbass tonsteins

The character of kaolinite hydromicatization within the Donetsk Basin tonsteins in the course of metamorphism depends on the types of enclosing coals: either normal or salty ones. Alongside with terrigenous minerals within the coal-bearing masses and the fossil sea waters, indicator authigenous minerals from salty coals – halite and glauberite – should be specified as the sources of sodium and potassium for kaolinite hydromicatization.

The first representatives of the genus Cameroptychium Leonhard, 1897 (Porifera, Hexactinellida) from the Upper Cretaceous of the Volga region

The first representatives of Cameroptychium on the territory of Russia, which are established in the rocks of the Upper Cretaceous of the Volga region, are described. The labyrinthine structure of the skeleton and the modular, colonial level of organization of these sponges are considered, which is typical for many Late Cretaceous Hexactinellids. The widespread manifestation of isomorphism indicates the finiteness of the formation of representatives of Hexactinellida. The origin of Cameroptychium is correlated with Santonian Plocoscyphia.

Representatives of the genus Botryosella Schrammen, 1912 (Porifera, Hexactinellida) from the Upper Cretaceous of the Volga region

Among the numerous and diversiform Late Cretaceous siliceous sponges collected throughout the Volga region, several representatives of the genus Botryosella have been encountered, previously unknown for the area. Analysis of the skeleton morphology, peculiar for massive transverse outgrowths, confirms manifestations of isomorphism in Hexactinellids and the opinion of inaccuracies available in the descriptive terminology applied to the skeletal morphology of this Porifera group.

Comparative characteristic of regional seismo-generating structures of the EuropeanAfrican through tectonic belt

Based on new data on seismicity and materials from surveys of active faults, information was obtained on regional seismogenic structures of the European-African through tectonic belt. The kinematic characteristics of the faults that make up the through tectonic belt and earthquakes that occurred within these structures are given. An analysis of gravity anomalies based on satellite data suggests that the seismogenic structures of the European -African through tectonic belt have an ultra-deep penetration into the mantle, which determines their high seismic potential.

Hydrothermally altered rocks – indicators of hydrocarbon unloading zones of the Krasnoleninsky arch (Western Siberia)

Our own research data as well as numerous publications of recent years on modern problems of oil potential in the West Siberian oil and gas province were used in this study.

The results of exploring the Lower Artinskian deposits of the western Caspian on the territory of the Volgogradskoe Zavolzhye area with high-resolution wide-azimuth seismic survey

The article summarizes the comprehensive analysis of the results of interpretation for the materials of the wide-azimuth seismic survey MOGT-3D for the purpose of a detailed study of the geological structure of one of the sites of the Volgogradskoe Zavolzhye area to identify and
prepare for drilling oil and gas prospective objects.

On the migration of oil pollution in the active layer and the possibility of their penetration into permafrost

Based on the review of the published data, the article analyzes the study of the problem of oil pollution migration in the upper part of the geological environment in the conditions of the Far North, where the movement of oil pollution occurs mainly in the layer of seasonal freezing and thawing of the cryolithozone. The factors influencing the spreadability and transport of oil, including the focus on the processes of formation of possible migration routes into frozen rocks are considered.

Lithofacies interpretation at the upper part of the Pokurskaya formation in the Cenomanian succession, the north of the West Siberian Basin

The lithofacies of the Cenomanian succession within a gas field in the north of the West Siberian basin were studied using well log information especially spontaneous potential log to determine the lithostratigraphy, hydrodynamic characteristics, possible reservoir sands and depositional environment of the study area for opportunities that will support the exploration program. Geophysical well logs from six profile wells were used for this study.