Izvestiya of Saratov University.
ISSN 1819-7663 (Print)
ISSN 2542-1921 (Online)


New Genus of the Actinopterygian Fishes (Eurynotoidiidae) from the Urzhumian of Republic of Tatarstan (Kluchevskoy Ovrag locality)

New genus and species of eurynotoidiid actinopterygians (Eurynotoidiformes), Kluchevichthys praeclarus gen. et sp. nov., is described from the uppermost Urzhumian (Kluchevskoy Ovrag locality), Tetushi District, Republic of Tatarstan. The holotype of а new form is an almost complete, non-deformed skeleton. The diagnostic characters of K. praeclarus were obtained in the morphology of the skull roof bones, dental system, scales and fins.

Postsporadopyle – colonial representatives of Craticulariidae (Porifera, Hexactinellida)

Among Craticulariidae, the representatives of Postsporadopyle are peculiar for the skeleton intricate morphology determined by dichotomy and trichotomy of the primary modules. Besides the P. triloba known from the Santonian of the Volga region, two previously unknown here species are considered.

Влияние некоторых параметров на устойчивость склона

В статье проводится анализ положения в массиве склона слабого слоя, его угла наклона и влияние этих параметров на устойчивость склона. В случае подходящих условий (изменение гидродинамического режима, влияние тектоники, антропогенное воздействие и т.д.) существуют предпосылки для активизации оползневых процессов. На территориях платформ широко развиты склоны в почти горизонтальных слоях, но имеющих, как правило, неровное залегание; в геосинклинальных областях, преимущественно в горных районах, углы наклона слабых слоев имеют порой значительные значения.

Genus Sororistirps (Porifera, Hexactinellida, Ventriculitidae)

Representatives of the genus Sororistirps, distinguished among the Ventriculites, have been detected in the Santonian – Maastrichtian rocks from the southeast of the Russian Plate. The structures of the skeletons and of the irrigation systems have been considered, the Sororistirps morphogenesis has been traced; the forms characteristic of the Santonian, Campanian and Maastrichtian spongiocomplexes have been determined.

Application of machine learning in the analysis of seismic data to identify tectonic faults in various seismogeological conditions

The article presents the results of a comparative analysis of algorithms for automatic interpretation of tectonic faults based on seismic data recorded in various seismogeological conditions. For each type of geological section (platform, salt tectonics, marine data), a cube of the probability of violations by an analytical algorithm and using trained neural networks was calculated.

On the issue of the methodology for lithologic and petrophysical studies of stone material (in the process of oil and gas wells drilling)

This article discusses some aspects of the methodology for preparing sludge and core samples for lithological and petrophysical studies. Methods for obtaining rockmaterial(sludge, core) are described interms of determiningthemoment of openingthe reservoir layer,tyingthe core in depth, and sampling the sludge. A sludge collector has been proposed that makes it possible to obtain sludge of overall fractions washed from the drilling fluid.

Stratigraphic Significance of Gastropod and Improving of Local Stratigraphic Scheme of Sarmatian Deposits of Moldavian Transnistria and Neighboring Areas

In the article it is argued the use of gastropod for stratigraphic subdivisions of Sarmatian deposition. Reasonably allocated typical stratigraphic complexes gastropods for individual horizons sarmatian of Moldavian Transnistria and neighboring areas. Stratigraphy of the sarmatian scheme within the area contains additional, proposed by the author, stratigraphic units in the rank of «layers with gastropod fauna».

Developmental History of Emanation Method and Their Role in Oil Geology at the Present Stage

The key insights in the history emanation method development for search and investigation of minerals are examine, the radiometric methods applied at the present stage for research oil and gas deposits
are quoted, generalization of results emanation survey lead within ore and oil deposits is made, application of the given methods for search and investigation of minerals is proved.

Brine Contribution to Hydrothermal Albitization Concomitant to Productive Reservoir Formation within the Cover (West Siberia)

Corrosion and regeneration types of plagioclase albitization have been determined in a terrigenous complex of productive reservoirs within the cover; this reflects two settings of tectonic-hydrothermal activation in a riftogenic sedimentary basin. Under the pulsating stress conditions (geodynamic anomalies), all plagioclases experience corrosion and, consequently, deanorthitization, with formation of authigenic albite foraminated crystals.