The article is devoted to the problem of forecasting hydrocarbon deposits in the junction zone of Western Siberia and the Siberian platform. Features of geodynamic processes can be used to increase the efficiency of prospecting. Geodynamic stresses of different genesis are one of the factors in the formation of the natural size classes of reserves and resources in the studying area. The activation of geodynamic processes in certain periods of the geological history of theregion led to the formation of non-structural and combined traps, the reformation of the conditions of occurrence of hydrocarbon accumulations.
The article represents data on the productivity of the basement of various world regions. It is shown that the deposits reserves in the basement rocks currently exceed 10 billion tons. In Western Siberia, about 60 oil and gas deposits have been discovered to date in the basement rocks. It has been shown that the geological structure of these fields contains common features that, by analogy with the well-studied fields of the Kyulong basin (Vietnam), can be considered as search criteria for oil and gas.
The paper describes the results of Rosneft’s activities in the w estern part of the Maracaibo sedimentary basin which is located in the nor th-west part of Venezuela. The paper presents two methods for creating a geological model for optimizing a waterflooding system and extracting residual oil reserves. Pre-condition for the consideration of few methods is uncertainty because of the strata heterogeneity and lo w resolution of the seismic.
Input data, approach and analysis of results have been considered. Differences in approach and strengths and weaknesses of chosen methods were considered.
Significant oil and gas potential are associated with deep-seated sediments of the Vuktyl autochthone in the area of development of the Vuktyl thrust. The least studied is the Visean terrigenous productive reservoir of the Lower-Middle-Visean oil and gas complex. Conducted a detailed correlation of the studied sediments. From 3 to 6 sandy layers in the thickness of clay rocks are allocated, depending on the location of the wells. Variable sediment thickness is noted. The presence of repetitive sand formations of bar genesis is shown, which can be considered as a result of unstable development of the territory, successive changes of regressions and transgressions against the background of the predominance of transgressive development.
The purpose of the research in this paper was to draw up a newest geodynamic scheme for the Western part of the Turan plate based on the recovery of neotectonic stresses and to determine local stretching areas at the intersection of multidirectional shifts. Tectonic stresses are caused by the influence of the Kopet-Dag and Caucasus orogeny. The compression axis is oriented submeridionally, and the extension axis is sub-latitude. This ensured the maximum activity of the diagonal strike-slip faults along which tectonic stresses were restored. At the intersection of oppositely directed strike-slip faults, local stretching areas are distinguished, which are characterized by higher permeability. The concentration of hydrocarbon deposits is calculated over a grid of 20x20 km2; it turned out to be increased in the stretching sectors. High permeability of rocks in the stretching sectors is of fundamental importance for the prediction of areas of hydrocarbon concentration.
The Arctic part of Western Siberia contains main volumes of hydrocarbon reserves and resources available for development in Russia in the ne ar future. Currently, the "NOVATEK" company is implementing major projects there to produce liquefied natural gas: "Yamal LNG" and "Ar ctic LNG 1, 2, 3". The development targets have complex geological structure, are poorly studied and located in harsh climatic and geographical conditions, far from industrialized regions. Cost-effective development of such objects is currently a major technological challenge for oil and gas industry, which necessitates the improvement of existing conventional technologies, approaches and techniques. The ar ticle summarizes the problems and main achievements of the company "NOVATEK" in exploration and development.
The statistics of the enrichment of the trace elements (TE) composition of oil in relation to the neighboring georesevoirs is considered. It is shown that the greatest enrichment falls on the elements most mobile in the conditions of the Earth’s crust. The second group of enriched elements is formed by the so-called biogenic elements, which indicates the close connection of oils with organic matter. The statistics of TE composition and reserves of hydrocarbon depositsis compared with statistical patterns for ore deposits, based on more available statistical data. A significant commonality of statistical patterns of characteristics of hydrocarbons and ore deposits is demonstrated.
The current number of production wells in the territory of the Romashkinskoye oil field is almost two orders of magnitude higher than the number of deep wells drilled to the crystalline basement.It has been proposed to detail the tectonic structure of the crystalline basement using skimming horizons for production wells, the classical method of convergence and digital technologies.
The features of the distribution of hydrocarbon systems in the sedimentary cover in foredeep troughs Pre-Urals and Yenisei-Khatanga deflections on the territory of the Volga-Ural oil and gas and Yenisei-Anabarsky gas-oil-bearing basins are considered. Some common and different features of the basins are described. In both basins, high oil and gas potential can be expected to realize in deeply submerged Paleozoic and pre-Paleozoic (Riphean- Vendian) sediments, presumably in non-structural type traps.
The purpose of this work is to select an effective additive of the “eco-organic” reagent to the oil-water emulsion during the extraction process in order to reduce the viscosity. The objects of research are highly viscous oil of the Bashkir horizon of the Vishnevo-Polyanskoe field and an “eco-organic” reagent based on humic acids.
The article discusses the results of a multi-criteria assessment of the oil and gas potential of the deep-lying Lower Middle Jurassic and Paleozoic deposits of the Yamal Peninsula and the adjacent territories and waters of the Kara Sea for 25 local sites. The ranking was carried out according to the degree of prospects for the layers (groups) and perspective objects.
The aim of the work is to study the structural and tectonic features of the structure of the pre - Jurassic base of the Shuginsky small shaft, to develop criteria for the search for hydrocarbon deposits in the deep Paleozoic horizons. Collected and analyzed materials generalization of geological and geophysical data and research works on the study of pre-Jurassic sediments in the territory of the Yamal-Nenets Autonomous district and Western Siberia. The interpretation of 3D, 2D seismic materials in the range of the Paleozoic complex is carried out. For the first time, an upthrust-thrust structural-tectonic model of the pre-Jurassic complex was created, seismic complexes were identified: Triassic, Permian, Carbon, Devonian. General search criteria for the detection of hydrocarbon deposits in the pre-Jurassic YANAO complex have been developed. Discovered a new geological phenomenon within Shuginsky shaft - structure horizontal shear in the sedimentary cover, and unusual assemblage of structures in the basement - structure "propellers".
In present work lithologic features and filtrational and capacitor properties (FCP) of rock-reservoir sheshminian strata of the of superviscous oil (SVO) field are investigated. The reservoir according to the description of a core material presented by non-uniform petrosaturated sandstones in various degree with prevalence caicium and clay differences. According to tabular data FCP and physical properties of sandstone layer are studied; the tendency of deterioration in efficiency of layer down a section is established: decrease in coefficients of open porosity, vertical permeability and oil saturation. Curve variations FCP on a well No. 1 section are for descriptive reasons constructed. Major factor of deterioration FES down section, most likely, increase in content of carbonate material. In addition correlation connection between filtrational parameters is established. 2 groups of the interconnected parameters with correlation coefficients more than 0,5 are allocated: 1) porosity- calcareousness-vertical permeability; 2) oil saturation calcareousness. Based on results of the previous researches of sheshminsky sandstones, authors have made assumption that the deterioration tendency down a section is explained by migration of reservoir waters from underlying deposits of the Sakmarian age.
The results of an analysis of the trace element composition of oil in a number of oil-bearing basins, so-called young oils, other caustobiolytes, organic matter and the average composition of the Earth's crust are briefly reviewed. Quantitatively, the tightness of the trace element composition of various oils with the chemical composition of possible sources of trace element in petroleum was compared. The obtained results testify to the model in which the dominant source of trace elements in oils is an organic matter with the fundamentally important role in the naftidogenesis of the ascending flows of the lower crustal fluids.
Extensive lithological and geochemical studies of the core of the deposits of the Bazhenov formation have been performed. Some aspects of the laboratory core research method based on the study of rock samples before and after exposure to organic solvents are considered. The depositional environment of the Bazhenov formation, the properties and sediments specifics, similarities and differences of the main deposits of the formation are described; the reasons for their differences are indicated. Characteristics of source rocks and reservoirs are given. Special attention is paid to the content of hydrocarbons in different types of rocks. The factors affecting the formation of the reservoirs in Bazhenov formations as well as the properties of various types of reservoirs and the patterns of their distribution in the vertical section and on the area are described.
The oil and gas reservoirs found in the weathered and fractured basement reservoir are considered as an unconventional hydrocarbon resources. The analysis and integration of geological and geophysical data on hydrocarbon fields found in the basement of the Cuu Long basin (The White Tiger, Dragon fields) has revealed the general features of their structure, which could be used to predict the potential of similar hydrocarbon accumulations. The decisive influence of neotectonic faults on the initial flow rate and accumulated production of production wells in the White Tiger field.
Prospecting new oil and gas deposits in Zuyatskoye field is promising due to its location near fields with oil and gas deposits in the Tula terrigenous and Vereiskian carbonate deposits. Volumetric method of the Tula and Vereiskian is used for hydrocarbon reserves calculation. Calculation of the hydrocarbon reserves were based on the contour maps of the top of pays of the Tula terrigenous and Vereiskian carbonate deposits, net oil maps, results of the production log tests in the pay zones and core analysis. Calculation parameters for the deposits were defined according to the core analysis results, well testing during drilling and casing formation tests, geology and geophysics well data and approved parameters from the adjacent ideal analogues.
The oldest Cenomanian gas fields of the north of the West Siberia have a steady tendency of the production decline yet today. The Lower Berezovskaya subformation gas was ignored before, now it attracts attention of the producer companies more often. The collector of this subseries is a complex underexplored non-traditional object promising to support gas production. Its mineral composition and basic petrophysical properties have recently been studied actively, however, the issue of the gas saturation level is still open.Argillous gaizes represent the Lower Berezovskaya subformation reservoir. This work provides the first evaluation of the saturation in this reservoir based on the interpretation of the geophysical studies of wells and encapsulated core analysis. It also reveals and describes the connection between the mineral composition of the gaizes, the structure of the voids, and the gas saturation.
Reservoirs of the Lower Berezovskaya subseries are fine-grained gaizes argillic to a variable degree. The reservoirs are commonly believed to be non-traditional due to an uncharacteristic combination of high porosity (at an average of 32%) and low permeability (below 1?10-3 um2). primarily. As this work shows, this is explained by the fact that the main part of pores (up to 75%) of the rocks in question is of subcapillary sizes making fluid movement practically impossible. At that, rock lithology affects the voids structure significantly. Thus, reservoirs with different content of the amorphous silica have different effective gas-filled porosity. Quantitate evaluation of the part of the differently sized pores among the voids in common is a lithological-capacitive model of the voids structure allowing describing these differences and forecasting possible effective gas-filled porosity of the reservoirs in question.