Геология

As a result of the complex analysis of petromagnetic, micro- and macrofaunistic data of deposits on the Kallovian – Oxfordian boundary of Dubki section (Saratov), which is one of candidates for a role of a Global Boundary Stratotype Section and Point of Oxfordian boundary (GSSP), it is established significant correlation between magnetic susceptibility variations and changes of an abundance, a specific variety of ostracodes, foraminiferes and ammonites.

Analysis of the published factual materials from the Lower Volga region has made it possible to distinguish and to describe eight local stratigraphic units of the Middle Carboniferous Moscovian stage. Lithologic and paleontologic characteristics of the suites and the subsuites are presented alongside with indications of the stratotype sections in particular wells. In the summary, the local stratigraphic units from the Lower Volga Region are compared with the stratotypes from the Moscow Region. 

Clay minerals and their parageneses make sensitive indicators of diverse processes involved in transformation of the Valanginian terrigenous rocks in the North Khalmerpayutinskaya field by hot solutions. The latter ones used to form hydrothermal-metasomatic reservoirs and to transport HC. The amounts of mixed-layer bodies and the proportions of swelling (smectite) and non-swelling (chlorite, micaceous) constituent packages make it possible to estimate the trap quality and the probability of HC presence.

Analysis of the traveltime curves of the principal types of the electromagnetic waves from the second-type seismoelectric effect was used to demonstrate the possibility of using the kinematic characteristics of that effect fields for studying aquifer locations. 

The article deals with the results of geological interpretation of geophysical data received during traversing («Uvarovo – Svobodny» line, the length is 376 km). Integrated gravitomagnetic installations alongside were applied during the process of interpretation. The new tectonic elements were found, and previously found tectonic elements were confirmed. More accurate information about location of the border separating the mentioned tectonic elements was obtained. 

Indicators of sedimentogenesis have been established for paleogeographic reconstructions based on ecosystem-nanostructural analysis of finely dispersed sediments. The Early Triassic Olenekian sediments have disclosed some features of primary food chains peculiar for marine basins within the landscapes previously regarded as continental ones. Those have been classified as plains periodically flooded by sea. The coccolith- and ostracod-bearing sediments from epicontinental basins have been recorded in the Middle Triassic sections.

Leaded researches showed, what hydrogeodynamic conditions of basic oil-gas-water-bearing complexes of Volga-Ural province are favorable for preservation of deposits of hydrocarbons. 

Private collections of rocks and minerals from the vast of the Ural Mountains and Kirghiz plains known in Saratov from the second half of the XIX century, by the beginning of the XX century have been concentrated in the vaults of Radishchev Fine Art Museum. Later on, some of them joined the collections of the geological cabinet at the Saratov State University.

In this article we had proved criteria of definition of productive collector’s effective thicknesses, porosity, shaliness and petrosaturation. We had revealed their features of vertical and lateral distribution. 

The article presents results of the detailed petromagnetic analysis of the core samples of the potassium salts of the Kungurian potassium salt complex in the Gremyachinskoe deposit (Volgograd region), which allowed for obtaining additional information on the stratigraphic rhythmicity and for substantiating the correlation levels.