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Saint Petersburg 2020
- Conference date: November 16-19, 2020
- Location: Saint Petersburg, Russia
- Published: 16 November 2020
41 - 60 of 134 results
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Diffraction Images and their Topological Analysis for Localization and Characterization of Fracture Zones by Seismic Data: from Theory to Practice
Authors M. Protasov and Y. BazaikinSummaryThe paper presents a technique for localization and characterization of fractured zones by seismic data. The developed technique combines the diffraction imaging and topological analysis of diffraction images. The testing results for realistic synthetic model and real seismic data demonstrate possibility for a reliable restoration of the statistical characteristics of the fractured zones.
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Geological Modeling, as a Means to Search for New Objects on the Example of the Sudovitskoe Field
By E. ShevelevSummaryThe use of geological models as a means for identifying new promising areas for the discovery of deposits within already discovered fields
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3D Scattering Imaging in Time Domain based on Asymmetric Summation: Real Data Application
Authors M. Protasov, V. Tcheverda, G. Reshetova, D. Petrov, V. Shilikov and A. LedyaevSummaryWe present 3D scattering waves imaging procedure based on the use of velocity model in time domain. This procedure gives the possibility to construct selective images corresponding to different directions of incident and scattering energy propagation. We tested the approach on realistic synthetic data greeted for 3D geological model, containing typical diffraction objects: faults, caves and fracture corridors. Approbation of the developed approach was provided on several real data from Eastern Siberia.
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Arctic Marine Electromagnetic Sounding
Authors V. Mogilatov, P. Osipova and A. ZlobinskiySummaryMarine geoelectromagnetic soundings with artificial sources is strongly hampered by the influence of a conductive layer of seawater. It is known, in practice, only one broad, successful application of electrical exploration – in the form of CSEM. However, the method has annoying limitations-the need to dive the installation to the bottom of the deep (more than 1000 m) sea and huge distances (up to 15 km). In the sea, covered with ice, and this method is not applicable. The possibility of deep sounding from the sea surface, and, therefore, from the ice surface arises if you use the TM-polarization field. Such a field in its pure form is generated by a vertical electric line (VEL) or a circular electric dipole (CED). VEL has known drawbacks even when used at sea. At the same time, the efficiency of CED is preserved in one-dimensional and three-dimensional situations, in frequency and time mode. Moreover, with the help of three-dimensional mathematical modeling, we show that the installation of CED is most effective on the sea surface. Thus, for electromagnetic sounding from the ice surface in the Arctic, under the condition of long-term ice drift, the use of CED is optimal and, in fact, there is no alternative. The experience of the NP stations showed that during the drift the station goes a long way in the Arctic regions, where information about the geology of the bottom is extremely scarce. Nowadays, it is planned to organize new drifting stations on the basis of ice-resistant self-propelled platform (LSP), which gives the prospect of geophysical research in the Arctic, including electromagnetic sensing, a new reality. In addition to general questions, the paper develops a three-dimensional mathematical apparatus for the established CED field in the born approximation, which is quite adequate in the conditions of the conducting section, in the presence of deep local inhomogeneities, and also considers the results of experiments with the installation of CED on the ice of the Ob reservoir.
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Anisotropy of Scattered Waves as a Tool for Prognosis the Fracture Direction of Carbonate Reservoir
Authors A. Melnik, D. Petrov and A. TuzovskySummaryFor effective development of carbonate reservoirs, it is necessary to reliably determine fracture direction in space. So specialists of LLC «RN-KrasnoyarskNIPIneft» developed a method for prognosis primary orientation of fracture by identifying seismic scattered waves. The paper shows the successful application of the methodology for determining the preferential direction of fracture at points, which is used for laying the project wellbore. Also, an areal analysis of anisotropy of scattered waves was proposed by the example of one of the fields in Eastern Siberia.
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Application of Truncated SVD Method to Regularize the Inverse Dynamic Seismic Problem
By A. VasilenkoSummaryOne of the statements of the inverse dynamic seismic problem is to find a velocity model of an elastic medium from the data recorded during field work. To solve this problem, the full waveform inversion method is used, which consists in minimizing the functional that measures the difference between observed seismic data and modelled ones. Minimization is reduced to an iterative process, which involves solving an algebraic system of equations. The matrix of this system turns out to be ill-conditioned. Thus, for its inversion it is necessary to apply regularization, which is based on truncated SVD.
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Prediction of Petroelastic Properties of Rocks Based on Machine Learning
Authors G. Vakhitova and A. KhayrullinSummaryThe research is related to the need for seismic modeling of Western Siberia oil deposits in order to clarify geological cross-sections and structures of oil deposits. In order to qualitatively match seismic data and a geological section and then interpret them, it is necessary to have acoustic and density log data in all wells. The presence of these data and their quality are of particular importance in solving problems of seismic inversions. But in some wells, these data are missing or of very poor quality. Thus, we need to restore the acoustic and density logs using other well logging data. Paper presents the results obtained by using neural networks. Neural networks are an effective data processing mechanism for predicting results of various kinds. This technology was applied in this research to predict the petrophysical properties of the formation. The prediction of interval time and density was made. The results agree with the initial data for the cross-section. The elastic parameters are calculated for seismic modeling. Their comparison made it possible to separate the rocks according to lithotypes into reservoirs and non-reservoirs and to construct structural maps taking into account the refinement of the distribution of reservoirs over the field area.
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New Age, Kolmogorov Full Functional Neural Network Usage for Nonlinear Predictive Seismic Inversion
By I. PriezzhevSummaryThe proposed new nonlinear technique based on full functional Kolmogorov neural network for the well log prediction using several seismic cubes and low-frequency model allows for getting high-resolution results. Application of Kolmogorov full functional neural network makes it possible to achieve a high level of freedom deep learning operator with only one hidden layer. The learning procedure is based on hybrid technique using Kolmogorov’s superposition theorem and genetic approach with A. N. Tikhonov regularization.
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The Effect of Saturation on Acoustic Properties of Carbonate Rocks
Authors E. Ziganshin, I. Nugmanov, D. Zaitsev, F. Husnutdinov, V.E. Kosarev and E.A. YachmenevaSummaryGiven the fact that huge volumes of world oil and gas reserves are contained in carbonate reservoirs, laboratory studies of the elastic properties of fluid-saturated carbonates are an area of research of great importance. In this paper, we consider the problem of the influence of pore fluid on the acoustic properties of carbonate rocks. The aim of the work was to identify changes in acoustic properties upon saturation. The P and S wave velocities were measured on 53 dry and saturated core samples. The velocities of 22 samples were measured during drying, at a saturation of 100, 75, 50, 25% and in a completely dry state. As a result, it was found that the S wave does not change upon saturation. P wave as expected increased at saturation. The effect of hysteresis of the P wave upon drying of the sample was also revealed. When saturated from 100 to 25%, the speed did not change, and when dried from 25 to 0%, the speed sharply decreased. This is due to the presence of “stiff” and “soft” pores in the rock samples. When drying, rounded stiff pores dry out first, so the speed does not change. Micropores and cracks then dry, and the speed decreases. This assumption was confirmed by lithological and microscopic studies on thin sections.
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Assessment of the Relationship Between Fracturing and Fault Tectonics of Paleozoic Deposits
Authors K. Diakov and D. KonoshonkinSummaryNumerous observations on outcrops, as well as theoretical considerations, confirm the effect of first-generation fractures on second-generation fractures. Parameters of fractures of the second generation are associated with a modified stress field due to previously formed fractures. To date, software products have been developed that allow the calculation of changes in the stress field due to previously formed fractures or faults. However, a large number of factors affect the predictive ability: such as the nature of fractures, the accuracy of estimating the parameters of first-generation fractures, the quality of the initial data etc. In this project, it is proposed to assess the possibility of predicting the second generation fracturing from the available data on the first-generation faults. During the study, the relationship between fractures of the first and second generations was confirmed. However, the zone of influence of the preexisting fractures significantly depends on the specific stress ratio in certain periods of time, which not easily could be predicted and is the main sources of the uncertainties. Also, the 3D BEM has some limitations and assumptions. Hence, the actual predictability of the second-generated faults and fractures is low and could be performed in a very limited area.
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Simulation of Mineral Scale Formation in Injection Wells During Low Salinity/Smart Water Injection
Authors S. Hosseini, A. Kalantariasl and F. TaleSummaryRecently low salinity and smart/engineered waterflooding is concern, where a compositional injection water injects through the reservoir and it may has been some reactions with anions and cations which exist in brine and totally cause deposition and precipitation of scale minerals in reservoir, wellbores and all paths which these waters flow (Sorbie et al. 2000). Engineered water injection (EWI) is optimized in composition and suable for injection into the reservoir for improving oil recovery through different mechanisms especially wettability alteration(Adegbite et al. 2017). As the water is being injected into the reservoir, its thermodynamic condition varies are negligible because in the reservoir, temperature and pressure consider fix but the most important note which is different mixing ratio of brine/injection water while vary by the time. In this paper we have tried to model scale precipitation and deposition within injection of EWI from surface to bottom of the well which we considered pressure and temperature gradients in order to defining change in temperature and pressure. By the time it had been performed to model scale precipitation and deposition where the injection water composition vary in specialized PV in a core by coupling geochemical software (PHREEQC) with MATLAB
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Microseismic Monitoring of Active Fracture Zones as an Instrument of Forecasting the Disjunctive Break and Deconsolidation Zones at the Mines
Authors I. Sharapov, A. Saetgaraev, S. Oganovsky, S. Feofilov, V. Ryzhov and I. NigmatovSummaryFor the first time at the oil mines of Yarega, microseismic monitoring of active natural fracture zones has been conducted on the areas of mining operations, planned for the period 2018–2020 for the purpose of assessment of microseismic activity in a planned depth interval of the penetration of mining, highlighting areas with the largest microseismic activity, mapping the preferential directions of fracture and prediction of the position of the fractures and deconsolidation zones associated with disjunctive breaks. The result is maps of the intersection of project mining with the predictive discontinuous (disjunctive) faults according to microseismic monitoring given the project depth marks of mining and the allocation of areas of possible caving with the ranking according to risk (low, medium, high). The coincidence of position of prospective disjunctive breaks and areas of risk of caving according to the microseismic monitoring results with actual complications recorded during mining allows claiming about the possibility of prediction of complications before carrying out mining operations on oil mines on the basis of microseismic monitoring. Microseismic monitoring of active zones of natural fracturing may be used for the design of mining operations and events in the process of mining with for the purpose of preventing emergencies and reducing the risks of caving.
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Vector Acoustic Full Waveform Inversion: Connection to Inverse Wavefield Extrapolation and Implication for Image Resolution
Authors P. Zheglova and A. MalcolmSummaryVector acoustic full waveform inversion (VAFWI) directly inverts vector data consisting of pressure and particle displacement components in the acoustic formulation. This allows us to take advantage of the directional information contained in the vector data at the cost of conventional full waveform inversion (FWI). We connect VAFWI gradient calculation to inverse wavefield extrapolation and show that this results in preservation of the low frequency content of the data during the inversion, and increase in image resolution compared to the conventional FWI.
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Convolutional Neural Network for Facies Classification and Oil Detection
Authors T. Gadaev, V. Dokholyan, K. Tushin, A. Salamatsin and A. GoncharovSummaryNeural network approach was proposed to the task of oil search and facies classification based on well logging data. We suggest an appropriate neural network architecture for this data. Our method demonstrates high validation accuracy on both problems.
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Accounting of Parameters of Mud Cake in Interpretation of Geoelectric Well Logs on the Example of Jurassic Oil Collector
Authors D. Evmenova, I. Yeltsov and N. GolikovSummaryThe mud cake on a well wall is formed in process of penetration of filtrate of drilling mud into layer. Porosity and permeability of cake have a considerable impact on a radial profile of specific electrical resistance. Experimental studies will help to determine these parameters and to establish their dependence on properties of layer and drilling mud. The work is devoted to the description of the installation for experimental study of the process of formation and properties of mud cake and the main results.
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Prediction of Fracture Parameters of the Bazhenov Formation using its Digital Twin
Authors V. Cheverda, V. Lisitsa, M. Protasov, G. Reshetova, M. Salischev, D. Sjemin, M. Pervunin, S. Jigulsky, Y. Pavlovsky and M. TarakanovskySummaryThe object of the research is a three-dimensional digital seismic-geological model of a real geological object and the corresponding field observations, both by the method of vertical seismic profiling and surface acquisition. The purpose of the work is as follows: 1. Construction of a digital structural model and its verification by comparing field observations and individual synthetic data sets; 2. Constructing a synthetic data set for a structural model for an areal excitation and registration system with a given overlap; 3. Construction of a model of a fractured medium based on the use of DFN and application of the concept of ideal seismic images. 4. Calculation of total wave fields for a fractured medium and analysis of the contribution made by the presence of fracturing.
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Reconstruction of the Acoustic Emission Events in a Core Sample by Time Reversal Mirror
Authors G. Reshetova, A. Anchugov and V. PozdnyakovSummaryThe paper presents the results of laboratory experiments and numerical modeling for solving the problem of acoustic emission event recovery. The equations of the dynamic theory of elasticity in the polar coordinate system were used as a mathematical model. For reconstructing acoustic emission events Time Reverse Mirror approach with total energy imaging was used. The simulation results made it possible to evaluate a number of basic characteristics for the configuration of a multichannel data acquisition system, the frequency of the acoustic emission signals, to determine the required number of recording channels and the position of the sensors in the core.
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About the Possibility of Using Smoke Gases (Industry Waste Gases) for Increasing the Oil Recovery Factor
Authors I. Gorjanc and S. MigunovaSummaryAchieving a high ORF is the primary task of all oil and gas companies. This issue is particularly acute in reservoirs with high geological heterogeneity. Justification of effective technologies that increase the production of oil reserves from reservoirs, and are aimed at reducing the emission of greenhouse gases into the atmosphere – are the most important tasks in the present era. Carbon dioxide, most commonly found in industrial emissions, is believed to be the main culprit for global warming. This work is devoted to the substantiation of the efficiency of the gas method of EOR. Carbon dioxide, which is both a concomitant component of oil and is an industrial waste from the gas processing plant, is proposed as the injection agent. The paper substantiates the technology to reduce the cost of gas preparation for injection into the reservoir. The objectives of this work are: review of world experience in the use of gas EOR methods; identification of conditions for the use of secondary resources to increase the ORF; study experience in the use of secondary gases at the field M ; study of the behavior of the parameters of development at the selected field; improvement of gas treatment technology for EOR.
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Study of the Viscosity of Synthetic Bitumen Oil and the Effect of Ultrasonic Treatment on It
Authors E. Marfin, M. Gabdukaev, A. Abdrashitov and R. GataullinSummaryThe paper presents the results of an experimental study of the temperature dependences of the viscosity of synthetic oil and the influence of ultrasonic effects on it. The effect of the oil component composition on the efficiency of ultrasonic treatment was investigated. Synthetic oil was a mixture of mineral oil with bitumen, the concentration of which ranged from 2% to 70%. The experimental data were obtained using a SV-10 vibrating viscometer; ultrasonic processing was carried out at a frequency of 22 kHz with an intensity of 10 W/cm2. It was established that the ultrasonic effect on the created oil samples as a whole leads to a decrease in viscosity. The maximum effect of viscosity reduction is observed at high temperatures and is more than 30%. With a low content of bitumen in oil, the effect of ultrasound is negative - the viscosity of the oil increases. The largest decrease in viscosity over the entire temperature range is observed in oil with a mass content of bitumen equal to 25% and averages 18.6%. The results can be used to improve the method of ultrasonic treatment of oil during its production and transportation.
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Multiparameter Data-Space Reflectivity Full Waveform Inversion in Complex Geology
Authors K. Gadylshin and V. CheverdaSummaryA reliable numerical method to solve inverse dynamic problem for elastic waves equation is proposed. This method is based on nonlinear least-squares formulation which is widely known as Full Waveform Inversion (FWI). The key issue on this way is correct reconstruction of macrovelocity component of the model with input seismic data without time frequencies less than 5–7Hz and reasonable source–recievers offsets. To provide correct macrovelocity reconstruction we introduce modified elastic FWI formulation which is sensitive to smooth space variations of both Vp- and Vs-velocity distributions
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