The structure of the initial and predicted oil resources of the West Siberian petroleum province is quantitatively assessed. The assessment is based on the law of mass distribution of hydrocarbon accumulations, i.e., the truncated Pareto distribution and simulation modeling of the general set of oil fields. This approach makes it possible to estimate the amount of oil and the total oil resources concentrated in intervals of any size, in particular, in intervals of small and fine fields, in order to determine the economic efficiency of their development. The considered estimates do not apply to unconventional resources, such as the shale oil of the Bazhenov Formation.

Regularities in the hydrogeochemical and geodynamic conditions were compared in the regions of the central West-Siberian megabasin, neighboring the Koltogorskaya–Tol’kinskaya suture zone. No regularities were shown to exist between the changes in groundwater chemistry and the tectonic conditions of the early period of basin development. The relatively recent or currently active tectonic processes were found to correlate with the distribution of groundwater mineralization in all aquifer systems and, partially, for individual components of ion–salt composition.

—The paper considers present-day rock temperature distribution in the top of the Tyumen and Malyshevka Formations throughout the West Siberian sedimentary basin. A temperature variations map based on earlier and newly obtained data has been compiled for regional hydrocarbon reservoir Yu2. A forecast of the temperature variations in the Malyshevka Formation top has been made for the Arctic regions that have not been well studied with deep drilling. Analysis of hydrocarbon pools distribution within the Bathonian reservoir is presented.

This paper discusses the productive beds of the Urna and Ust‐Tegus oil fields (West Siberia, Russian) and permeability and capacity properties that are influenced by geodynamic processes. Strong tectonic processes, accompanied by periodic magma intrusions, produced numerous fractures and faults in the Jurassic sediments, which act as conduits for groundwater flows, and thus led to the hydrothermal alteration of rocks and changes in the pore space. The data presented in the paper testify to the manifestation of these processes in the modern hydrogeochemical and geothermal conditions of the Jurassic‐Cretaceous sediments within the two oil fields and their vicinity. The petrophysical studies of the core samples and the hydrodynamic studies in the wells confirm that the reservoir properties of the productive strata are considerably heterogeneous. Despite the significant effect of the geodynamic factors, the analysis of the tracer data has not revealed any apparent spatial consistency of the presence (or absence) of a hydrodynamic connection between the wells and the locations of fractured and dynamically stressed zones. In our study, we have proposed and tested a method based on the analysis of morphotectonic features detectable in the depth maps of reference surfaces. This method is a useful additional tool for discovering and analyzing the relationships between the tectonic and hydrodynamic conditions of oil and gas fields.

The subject of study and research of seismic artifacts, which include the study of abnormal seismic records is related to the history of tectonic development, fluid dynamic processes in the sedimentary cover interval, distribution of the thermobaric effects from formation fluid flow, upflow hydrocarbon migration and other features of the evolution of the Earth’s crust. On the territory of Western Siberia and the Kara Sea basin there is a wide development of abnormal forms of seismic record in the form of abnormal ring structures (ARS), also called inverted ring structures (IRS), fluid dynamic abnormities (FDA). ARS are vertically extended ring-shape of wave field deformation. The most complete study of the identified ARS by 3D seismic data. A lot of statistics data of such kind of abnormal antiforms accumulated at the present time. There are still many questions about cause and effect relationship of such artifacts with the secondary hydrocarbons migration mechanism, formation and accumulation hydrocarbon deposits, impact on vertical and lateral hydrocarbon migration intensity, the abnormal high pore pressures occurrence. One of the trends of seismic interpretation is studying of fluid dynamic abnormalities of seismic record and the relation with oil and gas potential in the sedimentary basin. In the article, the attempt is to establish to identify the correlation between various forms of fluid dynamic structures (FDS) with time and the stages of deep formation fluids migration occurrence. It is possible that the allocation of new types of hydrocarbon deposits of fluid dynamic type may be associated with ARS. It is still a hypothesis. But the presence and analysis of seismic attributes allow us to make this suggestion. What is positive is that all ARS studied by drilling related to the multi-bedded deposits. Identification and studying ARS patterns of relations with the mechanism of formation and accumulation hydrocarbon deposits allow us to conduct exploration geological prospecting works more efficiently, estimate correctly geological risks, rank and identify the most prospecting areas for exploratory drilling. The practice of prospecting of recent years has shown the accuracy and informatively of this trend as an indicator of petroleum potential.

This paper presents the method and results of the hydrogeochemical spatial pattern modelling in the Cretaceous and Jurassic sediments of the Koltogor and Tolkin megatroughs and the surrounding areas of the West Siberian megabasin. The method is based on the preliminary calculation of two-dimensional radial profiles that provide the assessment of hydrogeochemical parameter changes with depth at the given points set within the study area. Using the results of the calculations, a model of hydrogeochemical conditions is constructed as a series of maps of the groundwater salinity in Formations, as well as NS and EW oriented cross-sections. The method is relatively simple, reliable and ensures result consistency. The analysis of the results indicates a significant variability of groundwater salinity both as a whole in the Jurassic-Cretaceous sediments, and within individual aquifer. On cross-sections, areas with relatively constant salinity appear both in the form of separate thin and inconsistent layers and in the form of thick extended zones. The geometry of the zones is not fully defined by the boundaries of the aquifers. Such variability is also reflected in the significant differences of hydrogeochemical conditions in different Formations and Subformations of the sedimentary cover of the West Siberian megabasin. The revealed substantial heterogeneity of hydrogeochemical conditions in the Jurassic-Cretaceous sediments indicates a complex genesis of the groundwater chemical composition and, in particular, the absence of a clear impact of the powerful pre-Jurassic tectonics, including those that have formed the regional vast Koltogor-Tolkin trough zone.

Geochemical survey is commonly applied during geological exploration to predict petroleum potential of large areas and to estimate the content of traps identified by the results of seismic survey. C1-C6 hydrocarbon concentrations in samples of surface and subsurface air, soil, snow, water, etc. are used as predictive indicators. At the exploration stage the capabilities of geochemical methods can be significantly expanded by comparing the content of gasoline hydrocarbons in samples of formation fluids and in samples of near-surface sediments. The method of chromatographic analysis of gasolines Chromatec Gazolin has been adapted for sample analysis. The taken measures to increase the sensitivity allowed us to register individual hydrocarbons C1-C10 in concentrations up to 0,01 ppb, which is obviously lower than their background content in the oil prospect areas. The revealed patterns are used in the geological interpretation of geochemical distributions based on theoretical ideas about the subvertical migration of hydrocarbons from the reservoir to the surface.

The article describes the recent distribution of temperatures of rocks in the roof of Tyumen and Malyshev suites for the whole territory of the West Siberian sedimentary basin. A map of temperature changes in the regional oil and gas bearing horizon U2 was built. The prognosis of the temperatures distribution in the roof of Malyshev suite on the understudied by deep drilling in Arctic areas is made. The analysis of placement of the deposits in the Bath with different phase state of the hydrocarbons is presented.

The comparison of hydrogeochemical conditions of Jurassic-Cretaceous sediments of Koltogor- Tolkinskaya suture zone and the adjacent tectonic structures was based on the results of the chemical composition analysis of almost 1,500 groundwater samples. The average values of the overall salinity of subsurface water and their content of basic components of ion-salt and microcomponent composition were compared for Aptian-Albian-Senomanian, Neocomian and Jurassic aquifer complexes of Koltogorsky, Tolkinsky, Yuzhno-Tolkinsky megatroughs and Tagrinsky, Bakhilovsky, Alexandrovsky, Srednevasyugansky megaswells, as well as Nizhnevartovsky, Kaymysovsky arches. Using Sulin’s classification and cluster analysis the type of groundwater was characterized by the hydrogeochemical parameters set. It was defined that the suture zone presence does not directly affect the hydrogeochemical conditions of deep horizons of this zone and adjacent areas.

Summary Considered features of exploration and commercial development of the West Siberian basin. Substantiates increasing relevance of the development and implementation of methods for analyzing chemistry data in conjunction with detailed data on the structure and properties of the deposits, which include the widest possible range of geological data - geophysical, geodynamic, geochemical, lithological and many others. The results indicate the reliability of the developed methods of analysis data on multi-scale research facilities, providing highly detailed and effective construction of the solution of theoretical and applied problems of hydrogeology in Western Siberia

The dramatic rise in the world oil and gas demand has led to concerns about the energy future for mankind. In the twenty-first century the sedimentary basins of the Arctic Ocean will play a leading role as petroleum provinces, including its Russian shelf areas. This article deals with the characteristics and assessment of resources in the Russian sector of the Arctic Ocean offshore areas. One can predict with 0.90 probability that the Arctic Ocean initial in-place hydrocarbon resources exceed 90 billion tons oil equivalent (toe). The assessments lead to the conclusion that during these years a petroleum production industry will develop on the Arctic Ocean Shelf.