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Saint Petersburg 2020
- Conference date: November 16-19, 2020
- Location: Saint Petersburg, Russia
- Published: 16 November 2020
1 - 20 of 134 results
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Results of Complex Core Studies of Usinsk Oil Field
By N. PopovSummaryThe article is devoted to the development of methodological techniques for the application of machine learning technologies, including deep learning, to the problems of in-depth analysis of geological and physical parameters based on the results of laboratory studies of core sections. To achieve this goal, we solve the problem of developing a specialized tabular format for describing the core sections of carbonate deposits, the formation of a database based on the developed format for further analysis and application of deep and surface training technologies. The Usinsk Deposit located in the Komi Republic was chosen as the object of research. The developed format allows all text descriptions of the geological characteristics of the section to be presented in a tabular form with a discrete encoding. On the example of permocarbon Deposit of Usinsk field, a unique database of 500 sections from 6 wells was formed according to the developed formatUsing the formed database, the ratio of mineralogical density and permeability with the categorization of points according to the danhem. As result of the experiments, a model was obtained, which allows to distinguish geological parameters from the photo of the plume.
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Focusing Properties of Kirchhoff Migration
By M. DenisovSummaryThe seismic source generates waves that travel into the subsurface, where they interact with inhomogeneities. The types of such interaction are scattering (or diffraction) and reflection. The problem of imaging of small objects producing diffracted waves is often considered in the geophysical literature. Before migration, wavefield separation is to be performed. Otherwise, in case the conventional migration operator is applied to the mixture of the wavefields, the result will be contaminated with artefacts. A special focusing operator should be applied for diffracted waves imaging. Such operator, being applied to the mixture of the wavefields, will distort the image of reflectors.
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Algorithm of 2D Mathematical Modelling Acoustic Reservoir Monitoring of Medium with Combined Hierarchical Inclusions and Convective Mixing in Fluid-Saturated Inclusions
Authors O. Hachay, A. Khachay and O. KhachaySummaryBackground: A new method of modeling acoustic monitoring of a layered-block elastic medium with several inclusions of various physical-mechanical and phase hierarchical structures has been developed. Methods: An iterative process of solving a direct problem for the case of three hierarchical inclusions of l, m, s ranks based on the use of 2D-integro differential equations has been developed. Results: The degree of hierarchy of inclusions is determined by the values of their ranks, which may be different. Hierarchical inclusions are located in different layers one above the other: the upper anomalously stressed, the second-fluid-saturated and the third anomalously dense. The degree of filling with inclusions of each rank is different for all three hierarchical inclusions. At the same time, the question of dynamic processes in fluid-saturated hierarchical inclusions related to convective mixing of a single-component fluid is investigated. Conclusions: The simulation results can be used when conducting monitoring studies of fluid return control of oil fields. The results can help explain the excessive water flooding of oil reservoirs.
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Application of Organic Geochemistry Methods in FEC Practice
Authors A. Ermolovsky, A. Kuklinsky, E. Zubareva, M. Nevestenco, E. Gurba and J. TarasovaSummarySolving the problems of reservoir geochemistry requires a large complex of geochemical works. Core and sludge (bituminous and molecular analyses) are studied to assess the prospects of oil and gas deposits and use in basin modeling. These studies are combined with geochemical studies of surface oils and gas condensates, including physical and chemical analysis, molecular analysis of the individual composition of gasoline fractions, n-paraffin, isoprenoid, aromatic hydrocarbons and polycyclic biomarkers.
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Application Of Plasma In Oil & Gas Industries
Authors R. Lashkari and A. KhalilnejadSummaryEfforts have been made to increase efficiency and reduce costs in all industries, especially in the oil and gas industries. Today, the use of modern technologies to reduce costs and improve the efficiency of work in all parts has been welcomed. One of the discoveries of recent decades is the discovery of the fourth phase of the matter called Plasma and its use in various industries. In this paper, we will discuss the plasma-derived technologies in the oil and gas industry and researches in this field. Considering the wide application of plasma in different parts of the oil and gas industries, this paper focuses on the research and operational work carried out in the areas of creating protective coatings on metals, cutting and milling of the casing and tubing, wettability changes, wellbore stimulation, perforation & EOR. Significant progress has been made in many of these parts and is expected to affect a large part of the oil and gas industries in the near future.
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Automatic Geoelectric Boundaries Detection on the Resistivity Images Based on 3D Numerical Simulation and Convolutional Neural Network
Authors K. Danilovskiy, G. Loginov and O. NechaevSummaryIn this study, we propose a new approach to borehole resistivity images interpretation, based on combination of 3D finite element simulation and convolutional neural network (CNN) algorithms. The CNN is trained on the results of 3D numerical simulation to detect geoelectric boundaries. High-performance parallel computing and data augmentation are used in order to minimize the time needed to obtain a set of images sufficient for CNN training. Despite the time-consuming processes of synthetic data obtaining and CNN training, the algorithm application does not require serious computing resources and takes seconds. The advantage of the developed algorithm is the ability to process images of an arbitrary length, due to the absence of fully connected layers in the CNN architecture.
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MEMS Latest Generation Digital Sensors - a Decisive Step in the Transition to Full Digital Data Recording
Authors N. Tellier and A. AbashkinSummaryThe quick development of broadband and high-density seismic acquisition methods is due to their recognition as effective means for acquiring datasets that prove rich enough not only to dramatically improve the seismic imaging, but also the overall reservoir characterization. Receiver arrays are progressively suppressed to preserve high-frequency signal, limit equipment inventory and facilitate its handling on the field. Single receiver / single source technologies are increasingly used. Full digital recording offers valuable high-fidelity seismic signal and provides an attractive platform for the industry transition towards higher trace densities and point receiver acquisitions. The prerequisites for the creation of end-to-end digital seismic recording channels have long been ripe. Analogs of similar transformations from other industries (telephony, sound recording, television, radio communication, etc.) tell us that the transition to the digit of the entire end-to-end recording path is possible and economically justified at the current stage of technological development of electronics. The present abstract provides an overview of MEMS sensor technology since the early 2000s, its advantages over geophone technology, analysis of the practice of using MEMS in seismic. The reasons for some conservative attitude towards MEMS over the past 15 years and prospects for further development will be discussed as well.
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Solubility Features of Dolomite Reservoirs in Hydrochloric Acid at Low Reservoir Temperatures
Authors S. Kuzmina and S. UrjadovSummaryLow-temperature carbonate deposits are typical for the territories of western Siberia. In conditions of low permeability, acid treatment of wells is a widely used method of stimulating the reservoir, but low reservoir temperatures have a significant impact on the effectiveness of the treatment.
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Isolation of Dolerite Intrusions by Borehole Magnetometry to Refine the Lithological Section of the Timan-Pechora Super-Deep Well
Authors G. Igolkina and O. HachaySummaryThe intrusions represented by gabbros - dolerites and dolerites of various structures in terms of magnetic susceptibility and magnetic field clearly stand out among the effusive-terrigenous and carbonate-terrigenous sediments of the Paleozoic Timan-Pechora super-deep well SG-5 (Timan-Pechora oil and gas province). In the conditions of a sedimentary section, the use of borehole magnetometry at depths of more than 3.5 - 5 km allows us to determine the actual position of dolerites in the section, their depth and thickness. Methods: for magnetometric studies at the Institute of Geophysics, Ural Branch of the Russian Academy of Sciences, inclinometer and magnetometers were developed that allow continuous measurements of the magnetic susceptibility of rocks (?), the vertical component (Za) and the entire vector of the horizontal component (H) of the geomagnetic field; magnetic azimuth (Am) and zenith angle (f) of the well. The technique for processing and interpreting the magnetic properties of dolerite intrusions was also developed at the Institute of Geophysics, Ural Branch of the Russian Academy of Sciences. Results: the possibilities of borehole magnetometry method for studying the magnetic properties of dolerite intrusions and clarifying the lithological and stratigraphic characteristics of the Timan-Pechora super-deep well (SG-5) for assessing the oil and gas potential of the Silurian - Lower Devonian deposits at a depth below the gas condensate reservoir. Conclusions: the magnetic properties of dolerite intrusions in the natural occurrence are determined according to borehole magnetometry, namely, magnetic susceptibility, magnetic field and magnetization. A more accurate location of the roof and the bottom of dolerite intrusions was established, which made it possible to localize and determine their thickness in the section of the Timan-Pechora super-deep well at depths of more than 3.5 km. Keywords: super-deep borehole magnetometry, magnetic susceptibility, geomagnetic field, magnetization, dolerites, intrusions.
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Fracturing Investigation on the Example of Granite Massifs the Republic of Karelia using Geophysical Methods
Authors E. Isakova and T. MingalevaSummaryThe study of rock fractures is essential to determine not only the surface distribution of cracks but also the degree of internal cracking. In this regard, the study of fractures in the deposits of facing stone is one of the main, complex and demanding detailed research tasks.
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Studies of Epsonamerica Dumps Using Geophysical Methods
Authors E. Isakova and E. OrlovaSummaryWatering levees of epsonamerica characterizing the moisture content of the stored rock dump and the density of stacking determines the strength characteristics of phosphogypsum and allocated its varieties, and, as a consequence, the stability of the dump structures. Accordingly, to ensure its safe operation, measures are needed to reduce the water cut of the enclosing dams and prevent the release of filtration water to the lower slopes.
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The Solution of Direct and Inverse Problems of Seismotomography to Study Paleovalleys on the Territory of St. Petersburg
Authors E. Orlova and E. BelekhovaSummaryThis article is devoted to the assessment of physical and mechanical properties of soils subjected to deep-frozen, seismic-acoustic tomography in construction metro's. Complex engineering-geological conditions of the territory of St. Petersburg suggest the use of the underground construction method of artificial freezing soils'. The system of paleovalleys, folded moist unstable sand-clay deposits are a complicating factor in the construction of the subway.
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Full Azimuth Differential Seismic Facies Analysis (FACIVAZ) for Prediction of Oil Saturated Fractured Reservoirs
Authors A. Inozemtsev and Z. KorenSummaryThe traditional approach to seismic facies analysis using conventional stack cubes often gives an uncertain result and limits the possibility of reliable prediction of productive sections. This is because the seismic recording form in the stack data is the averaged result of the stacking of various traces from different azimuthal directions obtained from different angles of incidence-reflection. The report presents a new approach and the technology of full azimuthal differential seismic facies analysis (Facies analysis versus azimuth - FACIVAZ) with the use of full-azimuth seismic data to improve the accuracy of the qualitative prediction of oil-saturated zones into fractured reservoirs. The work (First Break, Vol 37, January, 2019) showed that in the fractured or fractured-porous reservoirs, distortions in the frequency composition of the reflected signals occur due to the azimuth-dependent effects of dispersion and absorption of seismic signals in oil-saturated fractured media. These frequency distortions ultimately affect on the trace shape depending on the azimuth of each ray’s pair. In the case of full-azimuth seismic exploration, using deep processing of pre-stack data in the local angle domain the change in the record trace form depending on the azimuth direction becomes especially noticeable and significant. This effects are registered in seismic record traces and are used in FACIVAZ technology for more accurate and reliable qualitative prediction of oil-saturated fractured zones into reservoirs. In the report are given the basis and the technological process of the proposed approach as well as real examples of using in seismic facies analysis in comparison with the traditional approach at two oil fields in CIS. In the azimuth-dependent interpretation of seismic facies, the degree of increasing the accuracy of the forecast was estimated using borehole information on well productivity. It is shown that the FACIVAZ technology increases lateral seismic facies field resolution and increases the accuracy of prediction of oil-saturated permeable reservoir zones in comparison with traditional technologies. FACIVAZ also increases the reliability of separating oil-saturated fractures from dry fractures and can be used both in combination with an integrated interpretation and in the task of operational support for drilling wells.
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The Forecast of the Diamond Content of the Region Based on KMA Materials
By D. SekerinaSummaryIn the area of the Kursk magnetic anomaly during geological and geophysical surveys, deep (5–10 km) foci of highly conductive objects were identified. The increased electrical conductivity of terrigenous formations, as well as the detailed high-precision aeromagnetic survey data, made it possible to identify geological and geophysical markers corresponding to the horizons of carbon- and sulfide-containing shales. That is why the forecast of the diamond content of the work area is a very relevant topic. The materials of this work are based on the following aspects: - primary geophysical processing of the magnetic field matrix data according to the M-37 map sheet; - drawing up a forecast map for the most promising areas of work; - consideration of alternative deposits associated with kimberlite pipes to create the most accurate idea of the possibility of detecting the same pipes in the KMA region.
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Simulation Investigation of Hydraulic Fracturing Process in the Oil Reservoirs
Authors M. Rezaei Koochi, A. Khormali and G. BahlakehSummaryHydraulic fracturing is one of the most common methods of formation treatment for increasing the production rate, which can effectively enhance the productivity index. Simulation of hydraulic fracturing before the actual operation can help have the more effective treatment. In this work, the fracture width, which can be crated during hydraulic fracturing process, was simulated depending on the time. In addition, the required injection pressure for an optimum operation was determined at various injection rates. Furthermore, the effect of rock permeability and proppant mass on the productivity index and oil production rate was investigated. The simulation results showed that the optimum injection rate for hydraulic fracturing process is 4 L/s. At this rate, the maximum injection pressure was about 14.3 MPa. Moreover, the highest amount of productivity index was observed at lower values of rock permeability.
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Basin Modeling of Petroleum System as a Decision-Making Tool in Exploration
By A. PolischukSummaryOne of the key tasks of exploration geologists in a petroleum company is to assess the resource base of its license blocks as the basis for planning an exploration strategy. The adequacy of such assessments determines the soundness of economic decisions and, ultimately, the successful development of the company. The main method here is a risk-based probabilistic assessment of resources which allows to predict both a possible number of discoveries when reviewing a targets portfolio, and the expected increase in resources. In this case, one of the key issues of such a methodology is to assess the likelihood of hydrocarbons in traps. Currently, this issue is being increasingly solved by a scientific method, combining the achievements of the organic theory of the naftides origin and a modern computer technology, i.e. basin modeling. The purpose of this work is to assess the Asset’s oil and gas potential based on 3D basin modeling, including the assessment of the probability of success of exploration drilling using a case study of a sedimentary basin in South America. This basin is an “atypical” petroleum system which experienced intense magmatism in the Mesozoic time.
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Mathematical Modeling of Thermohydrodynamic Processes in a Formation with Hydraulic Fracturing in a Fluid Injection Mode
Authors M. Zakirov, R. Valiullin, R. Sharafutdinov and I. NizaevaSummaryThe present work is devoted to the study of thermohydrodynamic processes in a well and formation to study the possibility of determination of operating intervals by temperature measurements in injection wells with hydraulic fractures in quasi-stationary injection mode.
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Full-Volume Seismic Interpretation – Strategic Innovation in Seismic Geology
Authors E. Lavrenova, V. Kerimov, V. Kosyanov, A. Gorbunov and R. MustaevSummaryContinuous development of acquisition and processing techniques of seismic data provides nowadays, subsurface images of very high quality and resolution even in complex geological environments. It enables to perform the very fine geological models. But seismic interpretation is still an intensive and time-consuming process based on manual picking or auto-tracking of single horizons. As a result, seismic data is not employed in its entirety. That is why so many efforts in recent years are focused to advance new seismic interpretation techniques, which aim not only to automate interpretation, to make it faster and more accurate, but to correlate seismic positions along geologic time lines to provide a continuous fully interpreted seismic volumes. Convenience of such approaches is not so much by the continuity of interpreted seismic volumes. However, continuity itself enables to estimate relative geologic age between of any two points of seismic volume and to obtain any number of equivalent time lines or surfaces. The point at issue is that we can get more geological information from seismic data and make our models more sophisticated to reduce uncertainties and exploration risks. In this work, we use new technology (SAI) to demonstrate advantages of full-volume seismic interpretation for exploration.
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Implementation of Disruptive Innovations in Exploration - Problems and Possible Ways of their Overcoming
Authors V. Kerimov, E. Lavrenova, V. Kosyanov, A. Gorbunov and R. MustaevSummaryConventional exploration is close to its technological capability limit. That is why disruptive innovation is the only way to obtain the desired level of efficiency. Oil companies understand the necessity of innovations. Nevertheless, transformation does not progress rapidly. This work aims to clarify the obstructive reasons and outline possible ways of their overcoming
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Typical Depositional Sequence of Middle Jurua Subformation in the Solimoes Basin, Brazil
Authors A. Khramtsova, A. Vilesov and M. LebedevSummaryBased on facies analysis of cores from five wells and sequence-stratigraphic modeling, 12 III-order sequences were separated in the Middle Jurua subformation, which have been combined into three II-order sequences (JR70, JR60, and JR50) and were traced laterally. The complete section of III-order sequence in Middle Jurua sediments includes (upward) alluvial and eolian sandstones (LST), normal marine limestones and secondary dolomites (TST), and lagoon, intertidal, and sebkha evaporites (HST). Facies maps of second-order sequences were built which will serve as the basis for planning new wells and predicting reservoir intervals. It has been established that the sandstones of eolian complexes in the eastern and central parts of the work area are characterized by the best reservoir properties.
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