Articles

Geology

Natural classes of large resources of HC joining areas of Western Siberia and Siberian platform

Feliks S. Ulmasvay, Elena A. Sidorchuk, Svetlana A. Dobrynina

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.

DOI: 10.24411/2076-6785-2019-10070

Search criteria for the oil and gas potential of the West Siberia basement

Evgeny Yu. Goryunov, Rustam A. Mamedov, Minh Hoa Nguyen, Sevil A. Mamedova

DOI: 10.24411/2076-6785-2019-10055

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.

Consideration of the geological features of continental deposits during three-dimensional model building

Tamara A. Alekseeva, Yana A. Miryasova, Erica Morales, Yaraixa Perez, Selene Andrade

DOI: 10.24411/2076-6785-2019-10048

The paper describes the results of Rosnefts 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.


Refinement of the structure of productive visean reservoir of Vuktyl autochthone of the Upper pechora depression

E.A. Safarova

DOI: 10.24411/2076-6785-2019-10041

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 latest stress state of Mangyshlak and its possible impact on the distribution of hydrocarbon deposits

Lidiya A. Sim, Ilnur A. Sabirov, Nikita A. Gordeev

DOI: 10.24411/2076-6785-2019-10040

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.

 

Methodological and technological challenges in hydrocarbon exploitation of northern West Siberia fields: exploration and development

Alexey V. Yazkov, Yuriy N. Dolgikh, Aleksandr A. Kurkin, Artur Z. Nasibullin, Liliya M. Kadochnikova, Yana V. Kuznetsova, Petr I. Eliseev, Pavel A. Kudrin, Maksim S. Grigor'ev

DOI: 10.24411/2076-6785-2019-10034

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.

 

Some statistical patterns in concentrations of metals in hydrocarbon and ore deposits

Rodkin Mikhail V.

DOI: 10.24411/2076-6785-2019-10028

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 Earths 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.

Geological archives as a source of new knowledge about old oil and gas fields

Borisov Anatoliy S., Andreeva Evgenia E., Anisimova Liliya Z., Nurieva Evgenia M., Titov Arsen A.

DOI: 10.24411/2076-6785-2019-10024

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.

Hydrocarbon systems in foredeep troughs of ancient platforms

Punanova Svetlana A.

10.24411/2076-6785-2019-10012

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 effect of the "eco-organic" reagent on the viscosity of oil-water emulsion of the Vishnevo-Polyansky oil field

Volkov Juri V., Valeeva Svetlana E., Gainutdinova Albina R., Fatkulin Mukhammedrakhim R.

10.24411/2076-6785-2019-10013

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. 

Selection of primary organization objects of the preparation in the deep seals of the Yamal peninsula based on multicriteral estimation of geological and geochemical data

Vladimir L. Shuster, Svetlana A. Punanova

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.

oil gas local facility multi-criteria assessment oil and gas potential prospects choice of priority Yamal Western Sibe

A tectonic model for the structure of pre-jurassic sediments Suginsky small shaft, forecast of petroleum potential of the paleozoic

Valentina V. Sudakova, Victor Yu. Panasenko, Anton G. Naymushin

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".

pre-jurassic base paleozoic complex foundation fault fracture seismic complexes

Geological heterogeneity and distribution of filtrational and capacitor properties in a section of productive thickness sheshminian strata of the SVO field

Radmir R. Khaziev, Rustem F. Vafin

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.

Field of SVO laboratory methods of a research oil strata filtrationaland capacitor properties correlation dependence

Relationship of biogenic and deep processes on the data of the analysis of oil trace element composition

S.A. Punanova, M.V. Rodkin

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.

trace element composition of oils correlation value difference in TE composition of typical and young oils deep fluid

Correlation between the content and composition of organic matter with the lithological types of rocks in the Bazhenov formation

Varvara D. Nemova, Tat'yana A. Matyukhina

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.

bazhenov formation laboratory studies oil reservoir lithology geochemistry

The regularities of the structure of the oil and gas fi ds in the basement of Cuu Long basin (Vietnam)

Evgeny Yu. Goryunov, Minh Hoa Nguyen

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.

oil and gas potential of the basement White Tiger Dragon Cuu Long basin tectonic activity

Prospects of new hydrocarbon discoveries in the thin layers of the mature fi ds in the Perm Krai

Tamara I. Mayorova, Natalja V. Popova

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.

deposit structure reserves fields well

Gas saturation of the non-traditional reservoir of the Lower Berezovskaya subformation of the north of the West Siberia, and its relation to the void mineral composition and structure

Danil B. Rodivilov, Pavel N. Kokarev, Vener G. Mamyashev

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.

lower Berezovskaya subfor

Lithological-capacitive models of voids of nano-reservoirs in the Lower Berzovskaya subseries in the north of the West Siberia

Yana O. Karymova

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.

gaizes the Lower Berezovskaya subseries voids silica mercury po