scholarly journals Geodynamic and geological factors in the formation of large hydrocarbon deposits in subsalt sediments of the North Caspian region

2020 ◽  
Vol 63 (2) ◽  
pp. 47-60
Author(s):  
S. A. Aliyeva
Keyword(s):  
Subduction Zones ◽  
Oil And Gas ◽  
Upper Devonian ◽  
Lower Permian ◽  
Northwestern Part ◽  
Caspian Region ◽  
The North ◽  
Geological Conditions ◽  
Geological Factors ◽  
Hydrocarbon Deposits

Background. The Astrakhan-Primorsk region of oil and gas deposits located in the North Caspian region is one of the world’s largest reserves of hydrocarbons. This region stretches from land in the northwestern part of the Caspian basin, through the northern waters of the Caspian, to the south-eastern land part of the region under consideration.Aim. To identify geodynamic and geological factors in the formation of large hydrocarbon deposits in subsalt sediments in the complex structure of the North Caspian region of the Caspian syneclise. Materials and methods. An analysis of data on the geodynamic and geological evolution of the North Caspian region of the Caspian syneclise revealed specific features of its geological structure and development.Results. The nature of the formation series, as well as the geodynamic and geological conditions (the presens of spreading and subduction zones that caused an intense heat flow, the presense of an isolated sedimentation basin with intensive accumulation of carbonates in the Upper Devonian-lower Permian, a powerful salt-bearing Kungurian cap) were favourable for the generation, migration and accumulation of hydrocarbons in large tectonic-sedimentary Upper Devonian–Lower Permian uplifts characteristic of the Astrakhan-Primorsk oil-and-gas bearing region of the North Caspian. These uplifts were formed by shelf bioherms, barrier reefs and large reeftogenic atolls and emerged through ancient troughs. The large hydrocarbon accumulations, such as Kashagan, Tengiz, Astrakhanskoye and Korolevskoye, with high specific hydrocarbon reserves (more than 100 thousand/km2) are associated with these troughs.Conclusion. During the Upper Paleozoic, the main paleodepressions of the isolated basin of the North Caspian underwent a steady and long-term subsidence process, favourable for the accumulation of a thick stratum of carbonate (mainly reef) formations. This period was also characterized by the geothermal and baric conditions necessary for the transformation and subsequent migration of hydrocarbons from oil- and gas-producing complexes to reservoirs, which were mainly presented by massive carbonate formations of reef genesis. The as-formed deposits were preserved by thick salt-bearing Kungurian sediments. Directions for prospecting and exploration works aimed at discovering new hydrocarbon deposits in the subsalt sediments of the region were outlined.

Main directions of searching for hydrocarbons in Nadym-Pursk oil and gas region

2021 ◽  
pp. 23-31
Author(s):  
Y. I. Gladysheva
Keyword(s):  
Oil And Gas ◽  
Raw Materials ◽  
Accumulation Rate ◽  
Sedimentary Basins ◽  
Seismic Exploration ◽  
Research Approach ◽  
Field Development ◽  
The North ◽  
The Sixties ◽  
Hydrocarbon Deposits

Nadym-Pursk oil and gas region has been one of the main areas for the production of hydrocarbon raw materials since the sixties of the last century. A significant part of hydrocarbon deposits is at the final stage of field development. An increase in gas and oil production is possible subject to the discovery of new fields. The search for new hydrocarbon deposits must be carried out taking into account an integrated research approach, primarily the interpretation of seismic exploration, the creation of geological models of sedimentary basins, the study of geodynamic processes and thermobaric parameters. Statistical analysis of geological parameters of oil and gas bearing complexes revealed that the most promising direction of search are active zones — blocks with the maximum sedimentary section and accumulation rate. In these zones abnormal reservoir pressures and high reservoir temperatures are recorded. The Cretaceous oil and gas megacomplex is one of the main prospecting targets. New discovery of hydrocarbon deposits are associated with both additional exploration of old fields and the search for new prospects on the shelf of the north. An important area of geological exploration is the productive layer of the Lower-Berezovskaya subformation, in which gas deposits were discovered in unconventional reservoirs.

Improving the Geodynamic Safety of the Developed Hydrocarbon Fields in the Oil and Gas Bearing Basin

2021 ◽  
pp. 45-51
Author(s):  
Yu.R. Vladov ◽  
◽  
M.Yu. Nesterenko ◽  
Yu.M. Nesterenko ◽  
A.Yu. Vladova ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Theoretical Data ◽  
Additive Models ◽  
Federal Law ◽  
Distribution Law ◽  
Pearson Criterion ◽  
Geological Conditions ◽  
Geodynamic Processes ◽  
Hydrocarbon Fields ◽  
Hydrocarbon Deposits

The predominant area of application of the developed methodology is the construction of the distribution of the geodynamic state of the developed hydrocarbon fields in oil and gas basin, and the identification of the corresponding distribution law. A number of the hydrocarbon deposits in terms of geological conditions of occurrence, structure and other parameters are geodynamically hazardous during their development. The Federal Law «On Subsurface Resources» (Article 24) requires conducting a complex of geological, surveying, and other observations sufficient for ensuring a normal technological cycle of work, and the prediction of hazardous situations. The developed methodology based on the construction of aggregated additive models for each reservoir and field is presented. It includes four sequential stages (24 operations): first — prepare geodynamic data; second — determine the geodynamic state of productive strata; third — find the geodynamic state of the developed deposits subsoil; fourth — build the distribution of the bowels geodynamic state of these fields for the entire oil and gas basin and identify the relevant distribution law. Oil and gas basin in the west of the Orenburg Region (Volga — Ural and Caspian oil and gas provinces) is considered as an example of implementation. Unique data of twenty geodynamic parameters of 320 productive strata (56 fields) were used. It is revealed that in accordance with the Pearson criterion, the theoretical data with a high confidence probability (95 %) correspond to the law of normal distribution. Developed methodology has significant technical and economic advantages, since it allows to identify the geodynamic state of productive strata and subsoil of the fields being developed, to identify hazardous geodynamic processes and to choose rational modes for the development of hydrocarbon deposits.

scholarly journals Energy Export Potential in the Caspian Region and Its Impact on EU Energy Security

2017 ◽  
Vol 25 (2) ◽  
pp. 127
Author(s):  
Aigerim Ibrayeva ◽  
Raikhan Tashtemkhanova ◽  
Aigerim Ospanova ◽  
Baubek Somzhurek ◽  
Aiman Azmukhanova
Keyword(s):  
Soviet Union ◽  
Middle East ◽  
Energy Security ◽  
Former Soviet Union ◽  
Oil And Gas ◽  
Caspian Region ◽  
The North ◽  
World Energy ◽  
Oil And Gas Resources ◽  
The Eu

Energy security has emerged in recent years as one of the cornerstones of the European Union’s (EU’s) foreign policy. The EU is highly dependent on imports of oil and gas, 35 per cent of which comes from Russia. Diversification of energy supplies is thus a key goal for the EU. The Caspian region contains some of the largest undeveloped oil and gas reserves in the world. The intense interest shown by the major international oil and gas companies testifies to its potential. Although the area is unlikely to become “another Middle East”, it could become a major oil supplier at the margin, much as the North Sea is today. As such it could help increase world energy security by diversifying global sources of supply. Development of the region’s resources still faces considerable obstacles. This study focuses on the countries along the southern rim of the former Soviet Union that are endowed with significant oil and gas resources: Kazakhstan, Turkmenistan and Uzbekistan in Central Asia, and Azerbaijan in Transcaucasia. The Southern Energy Corridor (SEC), which aims to link Caspian Basin and potentially Middle East gas supplies to Europe, is one of the EU’s six priority axes of energy infrastructures. Drawing on the external governance literature, this article provides an analysis of the EU’s efforts in the wider Black Sea area to increase its energy security. It concludes that despite difficult domestic and geopolitical obstacles, the EU is pushing forward its objective to establish the SEC.

scholarly journals DEVELOPMENT OF METHODS OF INCREASING OIL RECOVERY OF FIELDS IN THE CHECHEN REPUBLIC

2021 ◽  
Author(s):  
А.А. Умаев ◽  
А-М.Б. Измаилов ◽  
Т-А.У. Мусаев ◽  
А.Ш. Халадов
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Gas Production ◽  
North Caucasus ◽  
Reservoir Properties ◽  
Oil And Gas Production ◽  
The North ◽  
Geological Conditions ◽  
Temperature And Pressure ◽  
The Impact

Наряду с совершенствованием эксплуатации скважин и повышением продуктивности за счет работ по воздействию на призабойную зону пласта, одним из главных вопросов является повышение нефтеотдачи пласта. Актуальность этих вопросов не вызывает сомнения применительно к месторождениям Северного Кавказа. Особенные геологическиеусловия присущие продуктивным пластам Чеченской республики (большая глубина залегания, высокая температура и давление, неоднородность коллекторских свойств и т.д.) затрудняют или полностью исключают возможность применения известных методов физико-химического воздействия на пласты с целью интенсификации отборов нефти и повышения нефтеотдачи. На нефтегазодобывающих объектах ЧР применялись основные физико-химические, тепловые и гидродинамические методы повышения нефтеотдачи пластов Along with improving the operation of wells and increasing productivity due to the work on the impact on the bottomhole formation zone, one of the main issues is the increase in oil recovery. The relevance of these issues does not raise doubts in relation to the fields of the North Caucasus. The special geological conditions inherent in the productive formations of the Chechen Republic (large depth, high temperature and pressure, heterogeneity of reservoir properties, etc.) make it difficult or completely exclude the possibility of using known methods of physicochemical treatment of formations in order to intensify oil production and increase oil recovery. The main physical, chemical, thermal and hydrodynamic methods of enhanced oil recovery were used at oil and gas production facilities in the Chechen Republic

scholarly journals Prospects for oil and gas presence of Lower Sarmatian deposits in the north-western part of the Outer zone of the Carpathian foredeep (by hydrogeochemical and hydrodynamic indicators)

2021 ◽  
Vol 3-4 (185-186) ◽  
pp. 16-32
Author(s):  
Halyna Medvid ◽  
Olga Teleguz ◽  
Vasyl Harasymchuk ◽  
Maria Kost’ ◽  
Solomiya Kalmuk
Keyword(s):  
Oil And Gas ◽  
Outer Zone ◽  
General Tendency ◽  
The North ◽  
Carpathian Foredeep ◽  
History Of ◽  
Hydrodynamic Situation ◽  
Gas Potential ◽  
Hydrocarbon Deposits ◽  
North Western

The hydrogeochemical parameters of the Lower Sarmatian aquifer of the north-western part of the Outer Zone of the Carpathian Foredeep have been studied. The waters of the chloride-calcium type (according to the classification of V. O. Sulin) are dominated. Other types of water are distributed locally. On the basis of the calculated genetic coefficients, the conclusion on sedimentogenic conditions of their forming during a geological history of the region is made. It is established that the general tendency for the deposits of the Outer Zone is increasing of TDS of water with depth and stratigraphy. The waters of the north-western part of the Outer Zone are characterized by reduced values of sulfate content and sulfation coefficient rSO42– • 100/rCl–, indicating the conditions of hydrogeological closed structures. The genetic index of formation water metamorphism (rNa+/rCl–) is mainly inversely dependent on TDS. Its values greater than one are inherent in waters of hydrocarbonate-sodium and sulfate-sodium types, which are not typical for the hydrocarbon deposits. The nature of fluctuations in the values of the chlorine-bromine coefficient is fully consistent with other hydrochemical parameters and the results of paleohydrodynamic reconstructions. A detailed analysis of the current hydrodynamic situation of Lower Sarmatian aquifer in combination with geochemical features and paleohydrodynamic reconstructions allowed to identify the perspective structures of the studying region. Our forecasts for the gas potential of the Krukenychy depression are consistent with the forecasts of researchers of Ivano-Frankivsk National Technical University of Oil and Gas. The results of their research are based on gravitational field anomalies.

scholarly journals Problems of unconventional hydrocarbons sources on the example of the domanikites of the Timan-Pechora oil and gas province

2021 ◽  
Vol 266 ◽  
pp. 01004
Author(s):  
V.B. Rostovshchikov ◽  
I.V. Kurta ◽  
Ya.S. Sbitneva ◽  
I. V. Kolokolova
Keyword(s):  
Oil And Gas ◽  
Upper Devonian ◽  
Significant Part ◽  
Shale Oil ◽  
Industrial Oil ◽  
Unconventional Hydrocarbons ◽  
Hydrocarbon Deposits ◽  
Exploration And Development ◽  
Hydrocarbon Development

The first industrial oil in the Timan-Pechora oil and gas province was obtained in 1929. By now more than 230 hydrocarbon deposits have been explored in the Province. A significant part of these deposits is under development. At the same time, the originally explored total resources have been developed in terms of oil only by 50%, in terms of gas - by about 30%. The remaining unexplored part of the initial total resources is forecast to be located in difficult unconventional bedding conditions, in particular, in the domaniсites of the Upper Devonian period. The so-called shale oil and gas are associated with them. The forecasting, exploration, and development of oil and gas deposits in the domaniсites require new methodological and technological solutions. The article discusses the problems of unconventional hydrocarbon development using the example of the domaniсites of the Timan-Pechora oil and gas Province.

Features of the composition of gas sorbed in the rocks of the upper part of the sedimentary cover section

2021 ◽  
pp. 23-35
Author(s):  
M. D. Zavatsky ◽  
A. A. Nezhdanov ◽  
A. N. Kurchatova
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Statistical Processing ◽  
Hydrocarbon Gases ◽  
Near Surface ◽  
Oil And Gas Exploration ◽  
The North ◽  
Component Content ◽  
Quantitative Indicators ◽  
Hydrocarbon Deposits

The topicality of the article is determined by the insufficient reliability of geochemical oil and gas exploration data for the localization of petroliferous geological objects. Geochemical surveys are carried out to mapping hydrocarbon anomalies caused by vertical migration of fluid from hydrocarbon deposits. Practice shows that not all anomalies in the content of hydrocarbons in the near-surface environment are related to the oil-bearing capacity of a given subsoil area. Therefore, when interpreting the data of geochemical oil and gas prospecting surveys, it is necessary to take into account not only quantitative indicators (namely, content of hydrocarbon gases on the surface), but also the composition of the gas sorbed by the near-surface substrate. The purpose of the article is to determine the composition of the dissipated gases in the rocks of the upper part of the section, to reveal the inter-component relationships, and, on this basis, to determine the genesis of each gas component sorbed by the rocks of the upper part of the section. To solve this problem, statistical processing of data on the component content of gas from core degassing of shallow (up to 30 m) wells drilled in the petroliferous territory of the north of Western Siberia was carried out. The obtained results confirmed the genetic heterogeneity of dissipated hydrocarbons and inorganic gases in the upper part of the sedimentary cover.

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