Geology

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Geological Structure and Petroleum Potential of the Svintsovskaya Depression Devonian Deposits in the Saratov Region

Based on geological survey data from previous years, it is safe to say that there is a possibility of oil and gas discovery in the Devonian terrigenous-carbonate deposits, similar to the findings in the regions known as the Ryazano-Saratovsky Basin and the Stepnovskaya Anticline, as well as its adjacent areas. Yet the geological structure and a potential for discovery of recoverable hydrocarbon deposits within the Svintsovskaya Depression are still unclear.

On the Genus Balantionella Schrammen, 1902 (Porifera, Hexactinellida)

The Balantionella genus has been recognized by A. Schrammen (1902) from a single specimen and two skeleton fragments from a locality in the «quadrate» Cretaceous rocks in Germany. In the southeast of the Russian Plate, representatives of the genus have been determined within units from all the stages of the Upper Cretaceous. This has made it possible to provide characteristics and to trace the morphogenetic tendencies in the representatives of the group. Three subgenera and 12 species have been recognized.

Correlation Transformation of Field Vibragram with the Account of Distorces of Phase Spectrum of Swip-signals

The original method of correlative transformation of vibrograms, which takes into account the distortion of reference signals in environment with frequency-dependent attenuation on the energy of elastic vibrations. The experimental material shows that the proposed method of calculating correlograms allows to significantly improve the quality of vibroseis materials. The possibility of calculating the attenuation decrement, which carries a significant amount of additional information on the structure and properties of the geological section, is also discussed.

Prospects of Geological Modeling of Oil and Gas Bearing Reservoirs While Drilling

In this paper, we consider the technology of geological modeling of oil and gas reservoirs, based on the results of interpretation of the mud logging and well logging data. Informative geological and geophysical parameters for distinguishing marking horizons were determined. A technological scheme for opening productive reservoirs is proposed, based on the allocation of reference layers of different levels.

The Content of Mobile Forms of Heavy Metals in a Soil Cover of the City Park of Volsk Town

The soil cover in the territory of the recreational zone «City Park» located in the central part of the Volsk town of the Saratov region is investigated. The assessment of a current sanitary and hygienic and ecological and geochemical state of soils is executed by results of the analysis of concentration of mobile forms of heavy metals. Excess of threshold limit values on nickel, copper and zinc is established.

Lithogeochemical Properties оf Terrigenous Rocks of Sortymsky Suite of Pyakyakhinskoye Field (North of Western Siberia)

The article represents lithogeochemical characteristics of rocks of sortymsky suite. It is revealed that the rocks belong to sellitem and the hydrolysates, the values of Sodium Module and Potassium Module indicates on sediments of greywacke containing hydromica, chlorite, plagioclase. Degree the maturity received by a thin pool alumosilicates was moderate (CIA < 70). Sortymsky the basin was characterized by shallow depth with an increase in salinity of the East to the West.

Auutygenic Dolomite High-сarbon Radials Bajenovskaya Switches – Indicator of the Regime Active Singenic Naptidogenesis

The article is devoted to the role of algal material of the Bazhenov suite in the the formation of authigenic dolomite. Authigenic dolomite could form in the environment of convergence of two processes: hydrothermal («wedging out» in the rear zones) and catagenetic (background) generated by conductive heat transfer. The development of the algal dolomite in situ shows that the source rocks experienced the stage of intensive (final) hydrocarbons generation.

First Magnetostratigraphic Data on the Maastrihtian of Mountain Crimea (Bakhchysarai Region)

The representative data about magnetic susceptibility, its anisotropy before and after heating up to 500°C and other petromagnetic characteristics were received on two sections of carbonate sediments of Maastrihtian – Chahmahly and Takma, located in Bakhchysarai region of the Republic of Crimea. In the studied sections there were established the magnetozones of normal and anomalous polarity, the comparison of determined zones with Geomagnetic Polarity Time Scale was conducted.

On the Stratigraphic Significance of Elasmobranchs (Chondrichtyes, Elasmobranchii)) in the Cenomanian of the Volga River Basin (Right Bank)

The paper analyzes the stratigraphic distribution of elasmobranchs in the deposits of the Melovatka Formation (Cenomanian) from the right bank of the Volga (part of the Penza, Saratov and Volgograd regions).

Secondary Terrigenous Screens of the Tyumen Switch – Reliable Factor of Preservation of Productivity Bazheno-аbalak Complex

Reliable isolation of the Bazhenov-Abalak complex of the Krasnoleninskoye field, ensuring its productivity, was provided by the appearance of secondary (hydrothermal) screens in underlying rocks of the Tyumen Suite. This was reflected in the sealing of the intergranular space of sandstones, silty sandstones and other rocks of the Tyumen suite with regenerative quartz, minerals of silica, and rarely sulphates and carbonates.

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