Geology

Representatives of the Genus Camerospongia (Porifera, Hexactinellida) from the Cenomanian in the Volga Region

The earliest assemblage of Cretaceous sponges has been found in the Cenomanian terrigenous rocks (the Melovatka suite) from the south of the Volga right bank region. A noticeable element of the assemblage is composed of small-sized Camerospongia, newly recognized in the region and peculiar for forming monotype colonies as well.

Forecast of the Phase State of Hydrocarbon Deposits in the South-East of the Volga-Ural Province

Authors: Loginova M. P., Kolotukhin A. T.

In article modern geothermal conditions of the main oil-and-gas complexes are analysed, temperature and deep borders of change of a phase condition of deposits of hydrocarbons are revealed, сonclusions are drawn on a possibility of the separate forecast of deposits of fluids, various on structure, in the considered territory.

The Matrix Method for Solving the Problem of the Second Kind Seismoelectrical Effect in a Geological Medium Biot

Authors: Gubatenko V. P., Moskovskiy I. G.

The matrix method for solving the problem of Seismoelectrical effect of the second kind is suggested. The excitement of this effect in a horizontally-layered medium by a point source of mechanical vibrations is considered. An analytical solution of the problem of the second kind Seismoelectrical effect for a homogeneous space is obtained.

Features of Postsedimentation Alteration Sand Accessory Mineralization with in Rocks at Final Stages of Halogenesis in the Outer Slope Zone of the Caspian Depression

Authors: Goncharenko O. P., Moskovsky G. A., Shelepov D. A.

The paper deals with regularities of postsedimentation changes in rocks at the halogenesis final stages within the Gremyachinskoye potassium salt field. Relation ship has been revealed among the postsedimentation processes, brine composition peculiarities, structure and regularities of terrigenous material inflow. Substanti al role of partial metasomatic replace mentofsalting-out halite in carnallite rocks is specified, as well as the role of diagenetic processes in halogen series, frequently accompanied with initial phases of plicative deformations.

Results of Application of the Oil and Gas Potential Preliminary Assessment Exploration Technology over the Potential Area of Saratov Region

Authors: Volkova E. N.

To improve the efficiency of geophysical prospecting, the Department of Geophysics of the Faculty of Geology of Saratov State University develops original complexation technology allowing to evaluate the possibilities of identifying promising oil and gas areas by circular thermal-magnetic anomalies, limited to the gradient zones of areas of gravimagnetic complex parameter or geopotential fields anomalies itself. The article presents the experience of applying non-seismic elements of the complex of this technology.

Peculiarities of Compositions and Formation Environments of Potassium and Potassium-Magnesium Rocks From the Pogozhskaya Rhythmic Member in The Northwestern and the Northeastern Parts of the Caspian Slope Zone

Authors: Moskovsky G. A., Goncharenko O. P., Baiguzina A. Z.

The paper presents the results of composition examination of the uppermost of the Pogozhskaya rhythmic member from the northern near-slope fringes of the Caspian Region. The potassium-bearing horizon encountered there is determined to have resulted from the demineralization stage overlapping the carnallite and the bischofite stage deposits. In potassium salt accumulation, the major importance is attributed to the process of potassium ion concentration during the large-scale precipitation of salt-out halite associated with inflowing brine condensed to halite stage.

Permian and Triassic Fish Holotypes Kept in the Earth Sciences Museum at the Saratov State University. Article 2. Actinopterygian Fishes

Authors: Minikh A. V., Minikh M. G., Yankevich D. I.

The paper presents the first holotype review of all the known Permian and Triassic ichthyofauna taxa of the Actinopterygii class, recognized and described by the researchers from the Saratov State University starting from the 1960-ties and currently kept at the University Earth Sciences Museum. Among the previously unknown taxa, there are two orders, three families, 22 genera and 57 species of actinopterygian fishes. Data on taxonomic compositions is provided, holotype numbers are presented alongside with their geographic and geologic referencing.

Definition of Paleointensity in the Eocene Section Plateau Aktolagay

Authors: Kurazhkovskii A. Y., Kurazhkovskaya N. A., Surinskiy A. M.

There was explored the behavior of Rns parameter (relation between the module of natural remaining magnetization after temperature 250° to the magnetization of saturation) in the interval of Ypresian in Aktolagay plateau (West Kazakhstan). The parameters were recounted to the values of H/H0 (relation between paleointensity to the intensity of modern magnetic field).

Bio-, Magneto and cyclostratigraphy of upper Berriasian near v. Alexeevka (Belogorskiy Region, Republic of Crimea). Article 1. Ammonites. Magnetostratigraphy. Cyclostratigraphy

Authors: Grishchenko V. A., Arkadiev V. V., Guzhikov A. Y., Manikin A. G., Platonov E. S., Savelieva Y. N., Surinskiy A. M., Fedorova A. A., Shurekova O. V.

The results bio-, magnetostratigraphic, cyclostratigraphic, lithological and mineralogic studies of the upper part of Sultanovskaya formation and Zelenogorskaya formation near v. Alexeevka (Belogorskiy region of Crimea) were presented in current work. The results of lithological and mineralogic analysis argues for the stratigraphic break between “Sultanovskaya” formation and “Zelenogorskaya” formation and implicitly indicate the age of the sediments as late berriasian.

Hydrothermal Processes in Basement Rocks of the West Siberian Oil and Gas Province

Authors: Richter Y. A.

Using Palyanovskoye oil field of Krasnoleninsk arch we demonstrated that local cataclasis and pneumatolytic-hydrothermal metasomatism manifestations are widespread in the Paleozoic basement rocks. For the first time the earliest indications of deep fluid activity were detected – at the stage of granite deep fluid saturation and primary diffuse leaching of feldspars. During transition to the infiltration process, they comprise jet-stream fibroblast structures formed due to biotite and plagioclase resorption by amphibole and scapolite association.

Geology

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