Browse

The transformation of hydrothermal processes in sediments is accompanied by the transformation of organic matter. Work presents an analysis of the change in the composition of the bitumoid of domanic sediments of the Volga-Ural oil and gas province with thermal effects on the specimen of the kerogen containing formation. The laboratory modelling of the katagenesis process on domanic rock sample was conducted in autoclave at a pressure of 50 atm, at a temperature range of 200-350 °C with the addition of water, and ...

The sediments of the of the Middle Franconian stage of the Upper Devonian along the cut contain the maximum amount of dispersed organic matter. This rock complex is the main oil producing stratum for most oil and gas fields on the territory of the Volga-Ural basin. The Semiluks horizon is represented by three types of sections: typical of Dominic and transitional ones. In Sargaevian sedimentation occurred under conditions of a shallow, epicontinental, open sea with normal salinity of water. The parameters of kerog...

The current problem of the last decade in the world is the increase of oil production volume due to the extraction of its hard-to-recover reserves. The difficulty of its extraction is determined not only by the petro-physical characteristics of the oil-bearing formation, but also by the physico-chemical properties of the fluid itself. However, not all methods of enhancing oil recovery are ecologically safe. The most effective and ecologically-friendly method of soil purification from pollution by oil products is t...

This work is investigation of the group composition of the bitumoids of Domanic shale deposits (Romashkino oilfield in the Volga-Ural petroleum and gas Basin). The samples were taken from different depths for this well. X-ray diffraction analysis revealed that the productive deposits are carbonate reservoirs consist of 92 wt% calcite. The extracted kerogen is of type II according to the Van Crevelin diagram, based on the ratio (H / C) and (O / C). It was found that the objects of the study differ in the mass conte...

Depositions of the Domanic type in the territory of Tatarstan are stratigraphically associated with carbonate-siliceous deposits of the Upper Devonian part of the section. These deposits, enriched with organic matter, are characterized by the ability to generate liquid and gaseous hydrocarbons and accumulate them in the form of deposits of unconventional type. In this paper, the results of geochemical studies of rock samples from the depth interval 1705-1728 m of the Semi-Bug-Buregian deposits of the Berezovskaya ...

The paper reveals the distinctive features of the change in the composition of natural bitumen - asphaltite from from the sandstones of the Permian sediments of the Spiridonovsky field in the territory of Tatarstan, in model experiments at a temperature of 250 °C, characteristic for steam-thermal impact on the formation, and the pressure in the system of not more than 2 MPa. The choice of low pressure is due to the fact that bituminous rocks in the Permian sediments occur at relatively shallow depths in the near-s...

Today, as a result of the depletion of low- and medium-density oil deposits, the world faces the problem of increasing oil production by involving non-traditional, alternative sources of hydrocarbon raw materials, which include fuel shale. In the area of the Volga-Ural oil and gas province, tight shale hydrocarbons reserves are located in domanic sediments. Quantity and spatial distribution of organic matter of domanic species remains underinvestigated. Assessment of oil potential, generation of mobile hydrocarbon...

The deposits of light oil and gas in the Devonian sediments of the "Ansagan" deposit are found. In the deposits of the Famenian stage of the upper Devonian, a gush of gas condensate was obtained. Samples of formation fluid are characterized by low density (0.78 g/cm3). The extracted oil refers to low-tar and paraffin (the content of paraffins is more than 2-3 %). The genetic relationship between oils and organic matter of rocks has been studied. To determine the group composition of bitumoids, the SARA method was ...

The goal of the presented study was to investigate and outline potential benefits of an integrated scientific analysis, encompassing modern automated mineralogy and largearea SEM-imaging data for the needs of multiscale geomechanical and hydrodynamical problem solving. A research was conducted on a set rock samples of a Russian promising tight gas-bearing formation, featuring nanometers-to-millimeters pore space elements, wide spectrum of mineral composition, and a complex multiscale pore-space topology. In the cu...

There is a growing interest in the world in coal as critical raw materials. Coal also can be a carrier of many valuable components. An important geological and geochemical task is to find out the conditions for their accumulation in the coal. The complex of trace elements including group of rare earth elements (REEs) has been studied in the coal seams of the Volga-Ural region (Russia). The article is considered the main regularities and reasons of the concentration of trace elements in coal seams. In the Volga-Ura...

The regularities of distribution of methane and sulfide sulfur (total sulfide ? ?H2S) in the bottom sediment deposits of therapeutic sulfide mud Lake Bolshoy (Big) Tambukan, located in the region of Caucasian Mineral Waters. Determination of methane and sulfide sulfur were produced in black and dark grey therapeutic mud, as well as in the underlying steel-grey clays and coastal sediments, represented by yellow-brown clay and loam. The formation of therapeutic sulfide mud flows through the biogeochemical environmen...

On the territory of the Volga-Ural oil and gas province in the Permian sediments are concentrated significant resources of bitumen-containing rocks, which are of interest as a source of unconventional oil. In this connection, it is very important to clarify the conditions for the formation of bituminous strata and their productive areas. High efficiency in the study of oil-bearing rocks has radio-spectroscopic methods for determining the structure of the oil deposit and the nature of its oil and bitumen saturation...