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.

The results of the probabilistic correlation analysis of geological and geophysical data on the territory of the Scythian and Pre-Caspian morphological structures to assess the prospects of oil and gas-bearing areas

The article considers method application results of correlation analysis of gravitational and magnetic field data, heat flux values, data of decoding satellite images measured in the regions of the Pre-Caspian and Scythian large concentric morphological structures of the central type. As a result, using the correlation method, a complex of various geophysical fields in these regions was analyzed. Local concentric morphological structures with high values of the gravitational field and heat flow promising for the search of new oil and gas fields were identified. 

Colonial Leptophragmidae (Porifera, Hexactinellida) from the Lower Santonian of the Volga region

Study of the skeletal morphology of a new representative of the Leptophragmidae family, with no suboscula in its structure, provides support for the earlier specified regularities in generation of Hexactinellida modular forms. Good preservation state of a major colony has made it possible to specify the aspects of paleoecology and taphonomy in the later representatives of the Middle Coniacian – Early Santonian succession of siliceous sponges.

The biogenic componentof theMiddle Turonian phosphorite horizonfrom the Senomanskaya Stenka section. Paper 2. Biostratinomical analysis

The paper presents biostratinomical characteristics of the Cenomanian and the Turonian fossil complexes found in the Middle Turonian phosphorite horizon from the Senomanskaya Stenka section (Volgograd region, Zhirnovsk district) constituting the basis of the benthic colonies and nekton communities. Probable interpretations for the settings contributory to generation of the phosphorite inclusion clusters are provided.