Геология

Comparison of results obtained by various authors from Callovian beds of the stratotype section in the Malinovyj gully has shown to be incomparable in the amount and quality of biostratigraphic information. Using this information for recognizing of local strata (suites) has reduced the minuteness of deposit division. This makes new comprehensive description of the section essential as well as thorough analyses of the latest results in combination with the earlier data on the updated ammonite standard. 

Plesiosauroid sauropterygian remains with mechanical traumas (predator’s bites) and paleopathological modifications in bone structure were described from the Upper Cretaceous deposits of the Lower Volga region. 

For the first time evedences of possible tactile sensor zones has been described in representative of non-theriodont clade of therapsids – Myosaurus gracilis (Dicynodontia). The system of foramina and grooves reflecting well developed blood network on the snout of Myosaurus is generally similar to the same descried for theriodonts and possibly represents development of sensor zones. Very large orbits and developed sensor fields on the snout of Myosaurus the most probably indicates the nocturnal mode of life and support previous ideas on omnivorous feeding. 

Passing waters received at improvement of Sokolovogorsky oil and gas field is subject of injection in the Paleozoic carbon-bearing collector. Digital geological model of the burial reservoir has been created to prove size of sanitary protection zones (ZSP) by the collective of NVNIIGG. This allowed carrying out hydrodynamic modeling and defining of parameters of spreading zone. Taking into account anisotropic properties of the reservoir, experts of chair of engineering geology and hydrogeology of the Saratov state university were involved in the project.

Main informative characters of facies-genetic types of the Late Phanerozoic marine and continental deposits for SE of the EasternEuropean platform are discussed. Their analysis has shown irreversible trends of decreasing of chemogenic formations from the Permian age to Recent as well as increasing of terrigenouscarbonate, sapropel and siliceous-carbonate biogenic sedimentation.

Termokappametric method, that is based on the effect of phase transition of sulfides and carbonates of iron to magnetite at heating up to 500° C in the oxidizing environment, allows to define variations of concentration of pyrite in rocks. It is carried out laboratory and field researches with the purpose of finding-out of an opportunity to receive quantitative, instead of the qualitative with help of the termokappametric method.

Detailed sampling of the Lower Cretaceous beds from the wells and outcrops in the north of the Volgograd Region has revealed peculiarities in the material composition alterations along the section at the level of local stratigraphic units. Cyclicity in the Cretaceous bed formation has been established. Analyses of the authors’ own and of the earlier published paleontologic data have made it possible to date the beds relative to the general stratigraphic scale.

In work for needs of the mine geophysics the outline of the Saratov oblast division into district is offered, it is based on the depths of bedding and litological structure of the basic oil and gas complexes, tectonic division into district of the territory, distribution of the saltmeasures and zones of development of the anomaly press, results of the metering of geophysical parameters in the chinks, stratigraphy layings out, data about the designs of the chinks, bed temperatures and pressure, mineralization of the bed of waters.

Results of laboratory and field researches on optimization of realization of mud acid treatments in the wells, opened terrigenous reservoirs at Saratovneftegaz OAO deposits, are submitted. it is shown, that efficiency of mud acid treatments of wells is determined by a degree of conformity of a mode of treatment of a layer with its geologicalphisical characteristic. 

This article gives a brief overview on the possible forecast of oil and gas content on the basis of the studies of DOS (dispersed organic substance) rocks and its catagenetic alteration. On an example of southern part of Buzulukskaya hollow the connection of paleozoic rocks catagenezic with the phase content of hydrocarbons deposits is traced. The original scheme of catagenetic location of the bowels for this territory has been devised on the basis of the usage of the method of calculation of total impulses of heat.