Timan-Pechora Province Research Articles

FEATURES OF WELL KILLING IN CONDITIONS OF CARBONATE RESERVOIR AND HIGH GOR

The article presents the results of studies on the use of well killing technology in fractured carbonate reservoirs of the Republic of Bashkortostan under conditions of loss of kill fluid and high GOR of the product. The geological and technical conditions of the Metelinskoye field are summarized, and the factors complicating well killing before routine and workover are described - reduced reservoir pressure during operation, previous large-volume salt-acid treatments, and the presence of hydrogen sulfide.The article substantiates the choice of invert-emulsion solutions (IER) for killing wells in the Metelinskoye field, taking into account the experience of using various killing technologies in the Volga-Ural oil and gas province. The authors have determined the physicochemical and rheological characteristics of kill compositions based on IER of various densities. An increase in the effective viscosity at high shear rates and the limit shear stress of the IER with an increase in the density of the composition was revealed. Taking into account the high risks of gas breakthrough during well killing in the Metelinskoye field, studies were also conducted to assess the gas-retaining capacity of the IER on an experimental installation by extruding the composition from a metal capillary. It has been shown that the gas holding capacity of these compositions with increasing density is described by an equation with a power function and a high degree of reliability. The effect of hydrogen sulfide neutralizer addition on IER properties was investigated. In order to increase the success of killing, the IER-based killing technology was selected and adapted to the existing conditions. The better blocking ability of higher density formulations has been confirmed. Successful well tests. To reduce the risks of using the IER and optimize the consumption of reagents during the further use of the technology, organizational and technical measures for killing and subsequent repair of wells were developed and implemented. The results of this work can be used in wells of the Ural-Volga region, Eastern Siberia and Timan-Pechora province with the presence of losses and a high gas factor, the repair of which is complicated by the lack of fluid circulation and the presence of excess pressure at the wellhead with signs of gas shows.

First palynological data from the Amat and Plyavinsky Horizons of the Main Devonian field

Research subject. Spores of higher plants from the Early Frasnian deposits of the Main Devonian Field. Material and methods. The work is based on the biostratigraphic method with the following stages: determination of the taxonomic composition of palynospectra, substantiation of the host rocks age, and data correlation. Palynological analysis was conducted using an improved technique by I.Kh. Shumilov and O.P. Telnova, which produced positive results. Results. For the first time, spores of higher plants were found in the sections of the Amatsky and Plavinsky Horizons of the Main Devonian Field. The palynospectra of the Podsnetogorsk layers of the Amat and Snetogorsk layers of the Plyavinsky Horizons were described. The palynospectra of the Podsnetogorsk layers are correlated with the palynoassemblage from the upper part of the Timan, and the Snetogorsk layers are correlated with the palynoassembly of the Sargaev Horizons, established in the Timan-Pechora province. The identified palynospectra complement the associations of vertebrate and invertebrate fauna, as well as rare macroflora, previously studied in these sections. The palynospectra from the Snetogorsk beds are correlated with the palynoassemblage of the Cristatisporites deliquescens – Archaeoperisaccus mennerii regional zone of the Timan-Pechora province. The palynozone characterizes the stratigraphic interval corresponding to the rugosa–transitans conodont zones (middle–upper part of the Sargaev Horizon). Conclusions. The established palynoassemblage from the Snetogorsk layers corresponds to the middle part of the Sargaev Horizon – the stratigraphic interval of the rugosa conodont zone. For the first time, the conducted palynological studies established a binding between the regional stratigraphic unit of the Main Devonian Field and the standard conodont zone.

Postsedimentary Transformations of Silurian Carbonate Rocks on the Central Part of the Chernyshev Ridge (Timan–Pechora Province)

Postsedimentary Transformations of Silurian Carbonate Rocks on the Central Part of the Chernyshev Ridge (Timan–Pechora Province)

Post-Sedimentation Transformations in Silurian Carbonate Rocks of the Central Part of the Chernyshev Ridge (Timan-Pechora Province)

The article presents the results of studies of post-sedimentary processes in Silurian carbonate rocks of the central part of the Chernyshev Ridge. A complex combination of secondary transformations in carbonate re-servoir is shown. The sedimentary strata show manifestations of regional and superimposed lithogenesis. In addition to stage-catagenetic changes, the sediments were also exposed to regressive infiltration catagenesis (epigenesis), accompanied by leaching and dolomitization of limestone. All this significantly affected the filtration-capacitative properties. The obtained data can contribute to the identification of new objects for exploration drilling and optimization of exploration works in the complex territories.

Organic Matter and Generation Potential of Paleozoic Deposits in the Tal’bei Block of the Chernyshev Ridge (Timan–Pechora Petroleum Province)

Abstract—The study area is located within the Chernyshev Ridge, a fold–thrust structure, which is a promising area for oil and gas exploration in the Timan–Pechora province. Petroleum source rocks of Paleozoic (from Upper Ordovician to lower Carboniferous) deposits stripped by the Vorgamusyurskaya-1 well in the Tal’bei block of the Chernyshev Ridge were studied by lithological, petrographic, organic-petrology, and organic-geochemistry methods. Most of the section is characterized by low values of Corg (<0.5%), genetic potential (S1 + S2 < 0.5 mg HC/g rock), and hydrogen index (HI < 100 mg HC/g Corg). Petroleum source rocks with elevated values of Corg (up to 0.9%), S1 + S2 (up to 2.1 mg HC/g rock), and HI (up to 277 mg HC/g Corg) were identified at different stratigraphic levels of the section: Upper Devonian (D3tm–sr), upper Silurian (S2gj), and Upper Ordovician (O3mt). The maceral composition of organic matter (OM) and the distribution of hydrocarbons in the saturated fraction of bitumens indicate that petroleum source rocks include only marine OM (type II kerogen). The degree of catagenesis of OM was estimated based on the bituminite reflectance (RVeq), Rock-Eval pyrolysis (Tmax), and conodont color alteration index (CAI). The available RVeq (0.63–0.84%), Tmax (430–443 °C), and CAI (1.5–2.0) data indicate that the entire Paleozoic well section is in the oil window (MC1–MC3). The new data refined the catagenetic zoning of the sedimentary section, according to which the OM reached the following gradations: MC1 in the lower Carboniferous and Famennian deposits, MC2 in the interval from the Frasnian to the upper part of the lower Silurian, and MC3 in the lower part of the lower Silurian and in the Upper Ordovician. The results of the study of petroleum source rocks and the type and maturity of OM will be the basis for basin modeling, which will increase the reliability of reconstructions of oil and gas formation at the Chernyshev Ridge.

Reefogenic Lower Permian megareservoirs in the south of the Khoreyver depression of the Timan-Pechora province in connection with the prospects for oil and gas potential

In the southern part of the Khoreyver depression, a structure of the first order, which is a fragment of the supra-order Pechora megasyneclise, ring and linearly elongated structures have been established - parts of the complex Assel-Sakmar reef system. In the Sandiveyskaya area, the reef formations of the Lower Permian are commercially oil and gas bearing. Several fields have been discovered here: Sandiveyskoye, Severo-Khayakhinskoye, Veyakshorskoye, Vostochno-Veyakskoye, Salyukinskoye and others, including those with high oil production rates. As a result of the analysis of 2D and 3D seismic data and a complex of drilling and well logging data, numerous reservoir zones with high porosity and permeability properties were identified and mapped in the upper parts of reef structures, which are highly promising objects for the search for oil and gas deposits in the Lyzayuskoye, South Sandivey and East Bagan areas. Keywords: reef systems; oil and gas reservoirs; filtration-capacitive properties.

Органическое вещество, его генерационный потенциал и состав артинских отложений севера Предуральского краевого прогиба (Тимано-Печорская провинция)

This article discusses the results of lithological and geochemical studies of the Artinskian deposits and organic matter, which is a part of the petroleum source rocks of the northern part of the Pre-Ural Foredeep of the Timan-Pechora Province. The rocks are very diverse in composition (clastolites, pelitolites, carbonatolites and mixtolites) and structural and textural features. Mixtoliths are widespread in shallow-marine environments (lower molasse deposits), which are associated with mixed terrestrial and marine organic matter. We recorded the predominance of poor and fair petroleum source rocks due to increasing terrigenous component. Mixtoliths of the Kochmes area (HI of 240 mg HC/g TOC) are characterized by the best generation potential. Organic petrography studies indicate the predominance of bituminite (sapropel base) in the composition of organic matter, the terrigenous components dominates in the eastern regions adjacent to the Urals.

Результаты внедрения комплекса мероприятий по обеспечению микроклиматических параметров рудничной атмосферы на объектах НШПП «Яреганефть» ООО «ЛУКОЙЛ-Коми»

The Yarega field is currently the only one in Russia where oil production is carried out by the thermal mining method. The deposit was discovered in 1932, and it is located in the southern part of the Timan-Pechora province, in the Ukhta district of the Komi Republic. The oil of the Yarega field has a high viscosity, and in order to ensure its production, the oil-bearing formation is thermally affected by steam supply through steam-falling (injection) wells into the rock mass. Depending on the development system used, steam injection can be carried out both through surface vertical wells and through underground hollow ascending wells. A combination of these methods is also possible. The heated oil-containing liquid from the producing wells located in the underground mining galleries of the mine is delivered to the surface using the existing collection and transportation system. The uniqueness of the technology of thermal mining production of heavy oil creates additional difficulties in the development of various technical solutions due to the lack of experience in operating such objects in Russia. This oil extraction technology is accompanied by an increase in the temperature and humidity of the mine atmosphere in mine workings, due to the presence of heat sources and areas where steam enters the mine working. Despite the applied technical solutions (increasing ventilation performance, cooling the air by spraying cold water, erecting additional concrete fasteners), there is a possibility of the microclimatic parameters of the air in the mine workings going beyond the established limits. In order to normalize the parameters of the mine atmosphere, a whole complex of technical and organized measures is being implemented, including thermal insulation of heat sources using modern materials. The article discusses various technologies for the use of thermal insulation coatings, analyzes their efficiency and offers solutions for choosing the optimal ways to reduce the temperature and humidity of air in the mine workings.

Geological trends of occurrence of heavy oil pools in north-eastern part of Timan-Pechora Province

Geological trends of occurrence of heavy oil pools in north-eastern part of Timan-Pechora Province

Multi-well deconvolution issue solving for producing well with increasing water-cut through CRM-model application

To improve the effectiveness of mathematical modeling, analysis, control, regulation and optimization of oil field development, it is very important to have the appropriate information support. To this aspect well testing is a necessary data source. One of the most actual well test data analysis instrument is deconvolution (single-well and multi-well).The principle of superposition is implemented in the theory of well test interpretation using convolution, which makes it possible to take into account the influence of well production (or wells) history on the studied section of the bottom-hole pressure change curve. Reverse convolution or deconvolution makes it possible to derive an equivalent bottom-hole pressure curve under an unknown filtration model, which will be a reservoir “response” to the well production at the constant rate, being equivalent to a changing well rate production. It makes it possible to “eliminate” the changing well rate influence on bottom-hole pressure curve and identity interpretation flow model.The main disadvantage of single well deconvolution is the condition of well interference absence. To overcome this constraint a multi-well deconvolution is applied. Its main purpose is to assess the interference of wells and to determine the inter-well filtration-capacitive properties.In common case multi-well deconvolution task solution is a labour-intensive process. The main limitation of known approaches application to multi-well deconvolution is assumption of constant filtration model (also actual for single well deconvolution). It makes impossible its application to producing wells with increasing water-cut analysis. Instead, it is possible to go to an equivalent task and describe the wells interference using a modified CRM-model.Therefore, the article proposes a specially modified CRM-model, which can be used as an analogue to bottom-hole pressure and well rate data multi-well deconvolution for wells with increasing water-cut. The CRMsim-model is taken as the initial model for further modification. Unlike to the CRMsim-model, in the present case, the accounting of the water-cut is based on historical data by modifying the productivity index. In total 6 different modifications were proposed.This concept is tested on synthetic data and on field data from an oil field in the Timan-Pechora province. Testing on the synthetic example shows good results. In the case of the real field example, the results acquired after multi-well deconvolution application to well with increasing water-cut by 6 proposed models were compared to well test results of zero water-cut production period. Evaluated filtration-conductivity properties are of high reliability degree for zones adjacent to well and reservoir between wells, pressure interference of every well has been identified according to tested well production data.This approach is a reasonable alternative to the multi-well deconvolution, which is not applicable to changing flow model of well with increasing water-cut.

Description and prospects of oil and gas potential of the Middle Devonian – Lower Frasnian complex of the south-east of the Timan-Pechora province

The article is devoted to the assessment of the petroleum potential of the deep Middle Devonian – Lower Frasnian oil and gas complex in the south-east of the Timan-Pechora oil and gas province. Within the Verkhnepechorskaya depression of the Pre-Ural foredeep and in the south of the Pechora-Kolvinsky aulakogen, several wells were drilled with a depth of more than 5 km, some of which opened deposits of the Lower Paleozoic. These strata are difficult to access and poorly studied, and the prospects for their oil and gas potential are unclear. The article describes the composition of the complex, gives geochemical characteristics, describes reservoir properties, and presents the results of 1 and 2D basin modeling. Models of the zoning of catagenesis are presented. The oil and gas complex includes a variety of oil and gas source rocks. It is possible to allocate collectors, as well as seals. In the Middle Devonian – Lower Frasnian sediments, the processes of oil, gas and gas condensate generation took place, which could ensure the formation of deposits both in the deep strata of the Middle Paleozoic, and in the overlying horizons. The generation and accumulation of hydrocarbons in deep-buried sediments occurred at a favorable time for the formation of deposits.

Геохимическая характеристика нефтей из отложений нижнего палеозоя Варандей-Адзьвинской структурной зоны Печорской синеклизы

The hydrocarbon composition of oils from the Ordovician-Lower Devonian carbonate oil and gas complex in the northern part of the Timan-Pechora province has been studied. According to the composition of normal alkanes, the studied oils are confidently divided into two groups. The first group is characterized by the dominance of the C17 homologue among n-alkanes, which is characteristic of the organic matter of marine carbonates, and the second group is characterized by C17 and C19 predominance with a sharp decrease in the content of C20+ n-alkanes (which is a sign of a special OM of marine carbonates – algae G Prisca). Genetic indicators determined by the distribution of polycyclic biomarkers, for example, the ratio of αββ steranes of the composition С27:С28:С29, also indicate that oils of types I and II have a slightly different composition of the initial OM, but are characterized by close conditions of sedimentation of the initial OM, which occurred in shallow sea environments. The indicators of thermal maturity make it possible to attribute the studied oils to the peak of oil window. It is probable that the generation of oils occurred in rocks whose organic matter reached the catagenesis grade MK2. Data for polycyclic biomarkers give slightly lower maturity scores than those for aromatic (phenanthrenes and dibenzothiophenes) compounds.

Updating Frasnian miospore zonation from the Boulonnais (Northern France) and comparison with new data from the Upper Palaeozoic cover on the Brabant Massif (Western Belgium)

Accurate palyno-analysis by S. Loboziak (from 1980 to 1983) of 28 samples from the Upper Givetian to the Middle Frasnian Blacourt, Beaulieu and Ferques Formations and of 44 samples of the Upper Frasnian to the Lower Famennian Hydrequent Formation are re-evaluated. Chelinospora concinna, Verrucosisporites bulliferus, Cirratriradites jekhowskyi, Lophozonotriletes media first occurrences are major criteria for Lower and Middle Frasnian, well calibrated by conodonts. Cymbosporites acanthaceus, Rugospora bricei, Grandispora gracilis, Diducites plicabilis, Corbulispora vimineus first occurrences allow to subdivide the Upper Frasnian where conodonts are poorly present. Samarisporites triangulatus versus Auroraspora pseudocrista taxonomy and stratigraphic significance are discussed. The reconnaissance borehole Nieuwkerke-De Seule (95W152), near the limit of the Upper Palaeozoic subcrop on the Brabant Massif (West Flanders, Belgium, 75 km east of the Boulonnais), which has intersected conodont-dated Givetian/Frasnian boundary at the transition between the Bois de Bordeaux and Bovesse Formations, contained poorly preserved miospores attributed to the triangulatus–concinna (TCo) Oppel Zones. In the nearby Nieuwkerke-Noordhoek borehole (95W153), strata also assigned to the Bovesse Formation yielded better preserved miospores which demonstrate a close succession of triangulatus–concinna (TCo) and bulliferus–jekhowskyi (BJ) Oppel Zones at the transition Lower–Middle Frasnian, also known in the Beaulieu Formation in the Boulonnais. Samples from the Heuvelland groundwater monitoring well (95W175), 10 km north of Nieuwkerke, contain the bricei-acanthaceus (BA) Oppel Zone suggesting a late Frasnian age, also known in the Hydrequent Formation in the Boulonnais area and in the Booischot Formation in the Booischot borehole (59E146) from the Campine Basin (Belgium). International correlation using Frasnian miospore zonation is attempted between the Pripyat Depression in Belarus, the Timan–Pechora province in Russia and North-West China.

Reservoirs in carbonates of the lower oil and gas-bearing complex of the Timan-Pechora Province (for the anniversary of T. V. Maydl)

The paper presents Tatyana V. Maydl’s researches of formation and patterns of distribution of natural reservoirs in carbonate deposits of the Timan-Pechora oil and gas province. Tatyana Viktorovna Maydl is a recognized specialist in oil and gas geology. Her significant contribution to the development of the theoretical base of formation of carbonate deposits in the region, reconstruction of sedimentation conditions, finding degree of influence of secondary transformations on the reservoir and filtration properties of carbonate rocks, development of the basis for geological models of carbonate reservoirs, are analyzed. In the field of studying the morphology of the void space in low-capacity carbonate reservoirs, T. V. Maydl found that in the Lower Silurian dolomites with a shadow biohermal structure had the best filtration features, and in the Upper Silurian — bioclastic limestones. The main volume of the void space in the first type is associated with caverns and cracks, in the second — with matrix porosity. We showed that the results of T. V. Maydl’s work were not only of theoretical, but also of practical importance.

The foraminiferal zonal scale of the Devonian–Carboniferous boundary beds in Russia and Western Kazakhstan and its correlation with ammonoid and conodont scales

This paper reviews the foraminiferal biostratigraphy of the Devonian–Carboniferous (D–C) boundary beds in Russia and Western Kazakhstan. The regional records of the zonal successions of Russia are summarised from sections and boreholes of the Volga-Urals Subregion of the East European Platform (Syzran no. 401 Borehole, Melekesskaya no.1 Borehole); Timan-Pechora Province of the East European Platform (Kamenka Section); South Urals (Sikaza, Zigan, Ryauzyak and Dzerzhinka sections); Middle Urals (Pershino Section); and West Siberia, Vagai-Ishim Basin (Borehole no. 1 Kurgan-Uspenskaya), and the zonal successions of Western Kazakhstan are summarised from the Mugodzhary Mountains. Three foraminiferal biozones can be defined in the interval comprising the latest Devonian and earliest Carboniferous: Quasiendothyra kobeitusana Zone, the Tournayellina pseudobeata – remnant Quasiendothyra Zone, and the Earlandia minima Zone. The D–C boundary interval is situated within the Tournayellina pseudobeata–remnant Quasiendothyra Zone. A correlation with the ammonoid and conodont zonations is proposed, which is useful for correlating deep-water and shallow-water successions.

RESEARCH ON THE INFLUENCE OF HIGH-FREQUENCY, SUPER-HIGH-FREQUENCY ELECTROMAGNETIC AND THERMAL EFFECTS ON THE PROPERTIES OF YAREGSKAYA AND DEVONIAN PETROLEUM

Petroleum produced in different regions and fields differ significantly in quality. The organization of pipeline transport of petroleum streams of a various quality produced in different geographic regions, according to a system with a complex topological structure, is possible only when controlling the quality of petroleum in traffic flows, in particular, controlling such property of petroleum as viscosity. Petroleum viscosity has a decisive influence on the performance of pumping and power equipment. The characteristics of the main petroleum pipelines depend on content’s viscosity. By influencing petroleum viscosity, it is possible to change the results of hydraulic calculations of main petroleum pipelines and pumping and power equipment without changing the equipment themselves, therefore, the task of changing the rheological characteristics of the pumped petroleum is timely. In this work, for the first time, thermal, super-high-frequency electromagnetic (SHF EM), high-frequency electromagnetic (HF EM) methods of treating the Siberian Devonian commercial petroleum and commercial petroleum of the Timan-Pechora province — Yaregskaya are studied. Both petroleum were exposed to thermal, high-frequency and super-high-frequency electromagnetic treatment on unique laboratory benches assembled at the Bashkir State University. As a result of the carried out studies, it was discovered that electromagnetic treatment affects the rheological properties of these petroleum in the temperature range corresponding to the operating temperatures of main petroleum pipelines. The most effective was the EM HF method of exposure. The relaxation time of the rheological properties of Devonian and Yaregskaya petroleum after EM treatment is 5 days, which is substantial compared to the currently popular thermal heating. The results of preliminary heat treatment with subsequent cooling on the Devonian and Yarega petroleum showed less efficiency compared to the results of electromagnetic treatment. When temperatures reach 30 degrees Celsius and above, the effectiveness of thermal and EM methods of exposure for both petroleum is reduced to zero. Another problem that arises during the pipeline transport of Yaregskaya and Devonian petroleum is the formation of asphalt-resin-paraffin deposits (ARPD) on the inner walls of the pipeline, leading to the need for more frequent cleaning of the pipeline, higher energy consumption to ensure the specified productivity of the pipeline. EM processing has also become one of the methods for solving this problem. As a result of an experiment to determine the amount of deposits on the inner walls of petroleum pipelines without treatment and after EM exposure, it was revealed that HF EM treatment is a preventive method for combating ARPD for Yaregskaya and Devonian petroleum. For Yaregskaya petroleum treated with HF EM field, the ARPD value on the walls of the model pipeline was 6 times less than for untreated Yaregskaya petroleum. Thus, as a result of all the work carried out within the framework of the study, it was found that high-frequency and super-high-frequency electromagnetic processing methods are effective in the transport of Yaregskaya and Devonian petroleum, and, unlike the thermal method of exposure and the introduction of additives, they contribute to an increase in the productivity of petroleum pipelines by improving the rheological properties of petroleum for a significantly long period of time, as well as to a reduction in formation of ARPD on the inner walls.

Силурийские карбонатные породы-коллектора зоны сочленения Хорейверской впадины и гряды Чернышева

The paper presents a comprehensive study of low-capacity Silurian carbonate reservoir rocks in the northeastern regions of the Timan-Pechora province. Silurian deposits in the sections of the Khosedayu swell, the Talbey block, and the Makarikha-Salyukin anticlinal zone are mainly secondary dolomites and, to a lesser extent, limestones, as well as with low-power interlayers of agrillites, clay dolomites, dolomite-anhydrite rocks. The deposits were formed in coastal-marine and shallow-marine conditions. As a result of the conducted studies, it was noted that dolomites with a shadow biohermal structure have the best filtration properties in the Lower Silurian, and bioclastic limestones – in the Upper Silurian. The reservoir rocks of the Talbey block of the Chernyshev ridge have the best filtration-capacitive properties. The main volume of the void space in the first case is associated with cavities and cracks, in the second one – with matrix porosity. However, the signs of modern karst in the salts of Malo-Tavrotinsky strata observed from the core indicate a possible reformation of the deposits, which requires more careful attention when predicting deposits. The results obtained can contribute to the design of a rational system for the development of hydrocarbon deposits.

Шельфовые участки Печорского моря – кластеры роста нефтегазового потенциала Тимано-Печорской нефтегазоносной провинции

Шельфовые участки Печорского моря – кластеры роста нефтегазового потенциала Тимано-Печорской нефтегазоносной провинции

Усовершенствование петрофизической модели продуктивных отложений Вуктыльского месторождения

The Vuktyl oil and gas condensate field of the Timan-Pechora province was discovered in 1964. The field is currently in the final stages of development, its hydrocarbon reserves are nearly exhausted. In order to expand the resource base of the field, research was undertaken to estimate the matrix oil reserves in the gas-saturated part of the Vuktyl oil and gas condensate field. At the first stage, the petrophysical model of productive deposits of the studied field was improved using new data.

Analysis of the core microstructure of terrigenic reservoirs based on lithological-petrographic studies to support the creation of digital core model

The question of digital core modelling appears highly relevant due to the fact that there is not always a sufficient amount of core material available from studied wells: in some cases, it is not possible to select core material (in case of loose, weakly cemented rocks); in others, such material may be completely absent. In order to create a computer model of a digital core, it is necessary to have a correct understanding of the pore space microstructure and rock lithological composition and structure, among the most important features determining the quality of sedimentary reservoir rocks. Such information can be obtained by carrying out lithological-petrographic studies of thin sections of reference (standard) core samples. The aim of the present work is to study petrographic thin sections for their further use in creating a digital core model. The article discusses the methodology and results of laboratory lithological and petrographic studies of thin sections using the available core information. The paper presents the results of laboratory studies of thin sections of terrigenous sandstones obtained from the Berea Sandstone formation (USA). The choice of the Berea Sandstone is due to its wide recognition by specialists, as well as its homogeneity, both in terms of the grain size of constituent rocks and their filtration and reservoir properties. The work also presents the results of data analysis on lithological and petrographic studies of core material from the terrigenous deposits obtained in the Timan-Pechora province in northern Russia. The research results can be used for mathematical modelling of the pore space microstructure in a digital core model.