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Saint Petersburg 2020
- Conference date: November 16-19, 2020
- Location: Saint Petersburg, Russia
- Published: 16 November 2020
61 - 80 of 134 results
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Numerical Study of Chemical Fluid-Solid Interaction on Pore-Scale
Authors T. Khachkova, V. Lisitsa, K. Gadylshina and Y. BazaikinSummaryWe present a numerical algorithm for the reactive transport simulation at the pore scale. The algorithm is based on the direct evaluation of the pore-to-matrix interface evolution due to chemical fluid-solid interaction. Using this algorithm we performed a series of numerical experiments simulating various physical and chemical conditions. After that we estimated the changes in the pore space topology and illustrated that these topological measure can be used to characterize completely different core matrix dissolution regimes, with different porosity-to-permeability-to-tortuosity correlations.
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Statistical Justification of Seismic Facies Analysis of Complex Carbonate Reservoir
Authors A. Volkova, K. Chuchalina and V. MerkulovSummarySeismic facies analysis is one of the methodological approaches to the study of the geological structure of the field, and at present it is a standard part of the interpretation process. Seismic facies analysis plays an important role in the process of seismic and geological monitoring, which is carried out at the stage of field development. A comprehensive interpretation of seismic and well data allows predicting at a qualitative level lithofacial variability in local areas, which contributes to a more rational placement of production wells. The prompt receipt of geological information allows to refine the facies model with each new well, refine the reservoir distribution contours, find new relationships between the structure of the geological environment and seismic image variations, and make more accurate subsequent predictions. The main purpose of applying various algorithms to extract facies is to reduce the ambiguity of the geological interpretation of geophysical fields.
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Paleogeographic Criteria for Prediction of Oil and Gas Potential of Jurassic Sediments of Western Siberia
Authors V. Shimansky, N. Taninskaya, E. Raevskaya, I. Nizyaeva, N. Vasilev, I. Gizdatullina, M. Grislina and K. ZundeSummaryBased on extensive material paleogeographic reconstructions of Jurassic sediments were carried out, sedimentation conditions were determined and oil and gas potential within the West Siberian oil and gas basin was assessed. Paleogeographic maps compiled for the Lower Jurassic (late Toarcian), the Middle Jurassic (Bajocian, Bathonian, Callovian) and the Upper Jurassic (Oxfordian, Kimmeridgian) productive complexes. Sedimentation criteria for the distribution of reservoir rocks are revealed, zones of development of improved reservoirs associated with channel and delta complexes are determined. New studies allowed to significantly clarify and detail the overall picture of paleogeographic development and identify the stages of formation of the Jurassic sedimentation basin for the entire territory of Western Siberia. On the basis of paleogeographic reconstructions, the forecast zones of formation of reservoir rocks are determined and the resource potential of Jurassic deposits within the unallocated subsoil fund is estimated.
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Integration Results of Processing Seismic Data using VPRTM Method with Logging Data to Improve the Efficiency of Solving Geological Problems
Authors E. Anokhina and G. ErokhinSummaryThe VPRTM seismic data processing method is based on full vector wave field decomposition. The change in petrophysical properties, expressed by changes in the logs, is expressed in anomalies of attributes calculated by the VPRTM method. Depending on the assigned geological tasks, it is possible to select the VPRTM attributes suitable for their solution.
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An Experimental Study of the Influence of the Earth's Magnetic Field on the Transient Process in a Geological Environment
Authors V. Mogilatov, V. Potapov, A. Shein, V. Gurev and P. OsipovaSummaryThe results of field experiments to detect the Hall effect during earth sounding by the method of establishing the electromagnetic field are considered. We are talking about the problem of interaction of the earth's magnetic field and secondary currents in geoelectromagnetic sounding, which was previously considered only theoretically. This interaction, in particular, is manifested in the effective anisotropy of the conductivity of rocks caused by the appearance of the Hall’s conductivity, which can be considered as a new geoelectric parameter, closely related to the material composition of the geological medium. The article analyzes the signals received by a special electrical installation and assesses the Hall’s conductivity. The experimental material was obtained in the field season of 2018, and confirmed and supplemented in the work of 2019. We also attempt to explain the signals of a new method of sounding becoming (vertical electric current soundings). VECS has already been repeatedly used for delineation of deposits, and systematically a successful result was obtained in the form of a unipolar signal anomaly over the deposit. Analysis of field signals definitely indicates that they are generated by a modified host thickness above the deposit (halo). This is a significant, favorable experimental fact, very confidently confirmed in various fields, but it has not yet been possible to explain it. So we propose this time to consider the possible influence of the Earth's magnetic field.
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Numerical Analysis of Mesoscale Fracture Connectivity Effect on Seismic Attenuation in Fractured Porous Fluid-Saturated Media
Authors M. Novikov and V. LisitsaSummaryIn our study, we investigate the correlation between seismic attenuation and fracture connectivity in fractured porous fluid-saturated media. In particular, wave-induced fluid flow attenuation mechanism manifests itself between fracture-filling material and background as well as within intersecting fractures. To estimate seismic wave attenuation concerning fracture connectivity, we first statistically generate fracture networks with different percolation length through whole fracture system. Then we perform numerical modeling of plane wave propagation within generated models. Using resulting wavefields, we numerically estimate frequency-dependent attenuation. Both cases of high-permeable and almost non-permeable background are considered. Results show that the dominant parameter affecting attenuation is fracture connectivity. However, attenuation increase with connectivity increase is caused by intensifying fracture-to-background WIFF, while fracture-to-fracture WIFF remains local and depends mostly on local fracture connectivity.
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Seismic Data Acquisition in the North of Volgograd Region - Using Different Seismic Sources to Minimize Exclusion Zones
Authors V. Belyaev, M. Stollenwerk and A. FirsovSummaryThe article is on seismic data acquisition using different seismic sources to minimize exclusion zones
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Interfacial Interactions Between Dolomite/Brine/Gypsum using Surface Energy Approach
Authors L. Mahmoodi, A.H. Nikoo, M.R. Malayeri and A. KalantariaslSummaryThe deposition of inorganic matters onto rock surfaces emanates from the interfacial interactions present in the scale/brine/rock system. Accordingly, the experimental work of this study investigates the incompatibility of the cationic and anionic brines with/without dolomite rock at elevated temperature. For doing so, the anionic brine included 6500 ppm ?SO?_4^(2-) is mixed with three different cationic solutions which possess 3000, 6000 and 9000 ppm ?Ca?^(2+), respectively. The observed findings imply that more gypsum deposits are obtained with increasing the salinity of the mixed brines. The same trend is also observed for the understudy system containing dolomite rocks. The outcome of the simulating geochemical software (PHREEQC) validates the experimental observations. However, incomplete dissolution and non-equilibrium conditions can be sought to address the difference between experimental and simulated consequences. From theoretical stand point of view, the extended DLVO theory states that the Lewis acid-base interaction energy dominates the intermolecular interactions in the gypsum/brine/dolomite system which otherwise shows reasonable agreement with the observed results. In other words, the behavior of the system can be rationalized through polar intermolecular interactions rather than dispersion.
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Assessment of Green Scale Inhibitors for Calcite and Gypsum Deposition
Authors L. Mahmoodi, M.R. Malayeri and A. KalantariaslSummaryDeposition of calcium carbonate and calcium sulfate mineral scales is the major problem encountering to the oil industry. Indeed, these salts exist and co-precipitate in the system of seawater injection for the purpose of EOR. For a long time, scale adhesion has been a matter of much attention. Instead of difficult scale removal, it seems that scale inhibition can be a suitable alternative, as prevention is better than cure! This paper investigates the inhibition efficiency of calcium carbonate and calcium sulfate through two distinct green scale inhibitors (SI), (A) and (B). The experimental results acclaim that (A) has high efficiency on both calcium sulfate and calcium carbonate, though (B) has more significant inhibition efficiency on calcium carbonate compared to calcium sulfate, at the similar condition of green SI dosage. Obtained scales were analyzed by filtration gravimetrical method as well as X-Ray diffraction (XRD). As it can be drawn from XRD, nearly 80% calcite and 60% gypsum would be inhibited in the absence of SI (A) using the dosage of 300 mg/L. Besides, the SI (B) inhibits 20% calcite and 10% gypsum. To sum up, more SI (B) would be required.
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The Accuracy of Seismic Forecast is the Key to Successful Drilling of Horizontal Wells
Authors T. Yurkina and I. MalykhinaSummaryThe paper presents an interdisciplinary approach to using the results of the interpretation of seismic data when accompanying the drilling of horizontal wells, which allows predicting the presence of a fault in the profile path of a horizontal well, an initial assessment of the bedding parameters and the amplitude of the fault plane. The forecast accuracy of the structural framework allows a more prepared approach to drilling a horizontal well. The paper shows the possibilities of using seismic results, allowing to perform work on the optimal wiring of a drilling tool within an oil-saturated formation. This view will be of interest to specialists in the design and construction of horizontal wells. An integrated approach to ensuring the drilling process, reducing or minimizing the risks of formation loss can be applied to any field being developed.
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Analysis of Wellbore Resonance Effects on Acoustic Noise Characteristics in Gas Producers
Authors D. Mikhailov, N. Mutovkin and I. SofronovSummaryMeasurements of acoustic noise in production logging are aimed at locating well casing leakage, crossflow behind casing, fluid/gas inflow, etc. Interpretation of the data can be difficult because of the wellbore resonances having a significant influence on the registered signal spectrum. Using numerical modeling we investigate the spatial-frequency structure of acoustic fields in the wellbore excited by a noise source located in the near-wellbore zone. We analyze influence of geometry and physical parameters of the reservoir and wellbore on the resonances. Also, we consider an example of the acoustic noise spectrum recorded in a gas-condensate producer and conclude that the intensive acoustic signal registered along the extended depth interval is caused by wellbore resonance modes, rather than by an extended inflow zone (which according to production logging data corresponds to a narrow interval of natural fractures). On the other hand, the observed wellbore resonances enable using this natural signal amplification for more reliable inflow identification. Thus, the analysis of acoustic noise spectra by taking into account the wellbore resonances improves the precision of the determination of inflow intervals.
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Optimization of Geomechanical Test Programs for Oil and Gas Reservoirs
By S. ParnachevSummaryNew methodics of geomechanical testing are suggested to provide a wider undestangidng mechanical properties of evaluating geological sections
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Optimization of the Density Model of the Section in the Study of the Pre-Jurassic Complex
Authors A. Volkova, V. Merkulov, F. Grabovskaya and P. VereshchaginSummaryThe study proposes a methodology for optimizing the process of constructing a density model of a sedimentary section for the subsequent extraction of pure gravitational anomalies from objects of the pre-Jurassic complex. The optimal density of exploratory drilling for the interpretation of data of gravity survey at a scale of 1:50 000 is revealed and recommendations are given for working with survey data at a scale of 1: 200 000, which will reduce the processing time of data on sedimentary cover and focus on pre-Jurassic deposits.
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Spectral Characteristics of Acoustic Noise During Air Filtration in Highly Permeable Porous Samples
Authors E. Marfin, A. Abdrashitov and A. GalimzyanovaSummaryFiltration of fluids in porous media leads to the generation of acoustic noise. The spectra of such noises are determined by the physical properties of porous media. In this work, we studied the spectral characteristics of air filtration noise in highly permeable porous samples. The characteristic features of the obtained spectra are established. In particular, the effect of sequentially switching off the frequency bands in the spectrum with a decrease in the pressure drop was found. It is established that the dependence of the filtration noise intensity is piecewise linear. Moreover, the tangent of the angle of inclination depends on the permeability of the porous medium. The results can be used to develop a theory of filtration noise in saturated porous media.
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Seismic Inversion Through the Application of Machine Learning Algorithms
Authors A. Smorodin, G. Shishaev, A. Volkova and D. EgorovSummarySeismic inversion is one of the crucial step in life of all oil fields. Obtained rock property from recorded seismic response is closely associated with distribution velocity and density in the rock section which are products of acoustic impedance. Conventional inversion techniques have disadvantages such as knowledge requirement of wavelet in deterministic case, or construction of geological model in stochastic case as input data. Well logging is the most representative source of rock properties, especially sonic and density which provide with essential information about reservoir. This kind of information might be used to obtain porosity distribution through the well and further permeability, knowledge of which is crucial for appropriate field development, but these measurements conducted quite rarely in wells. Machine learning algorithms will be applied in order to obtain density and sonic logs from seismic trace. Applied algorithms mainly based on statistical data analysis and allow generalize approach for achieving problem to solve. Also algorithm permits to avoid choosing of wavelet which is a significant disadvantage of conventional seismic inversion techniques. From the machine learning point of view it is required to solve regression problem which implies data series prediction from the given one.
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Experimental Investigation and Geochemical Interpretation of Brine/Carbonate Rock Interactions during Low Salinity Waterflooding
Authors F. Tale and A. KalantariaslSummaryLow salinity water process gains remarkable attention as an EOR method in recent decades. Its importance is a consequence of higher ultimate oil recovery. There is not a unique idea behind its influence, especially for carbonates due to their complex structure, yet researchers ascribe it to various mechanisms among which brine/rock interactions play an essential role. Brine/rock interactions are responsible for two major low salinity processes in carbonates, rock dissolution/precipitation and Multi-ion exchange (MIE). This study presents experimental and simulation study of the effect of these processes at the rock surface. The interactions are investigated through mass difference measurements of the carbonate samples (including both calcite and dolomite) as a result of reaching equilibrium condition with 4 different brines (typical seawater, and its 5, 20 and 40 dilution folds). A geochemical software, PHREEQC, is applied to simulate brine/rock interactions and surface complexation reactions in order to clarify the role of each mechanism. Good adaptation of experimental and simulation results shows the validity of the proposed model that is designed by PHREEQC.
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Geological Structure of the Neoproterozoic-Paleozoic Sequences in the North-East of Western Siberia
Authors N. Munasypov and V. BaldinSummaryThe model of the geological structure of the Neoproterozoic-Paleozoic deposits of the north-east of Western Siberia proposed by the authors is the first work where the obtained results and conclusions are based on regional mapping. This was made by using new highly informative 2D seismic data in the volume of large pre-Jurassic megasequences, including the adjacent large geostructures along the flanks of the Western Siberian basin. The study of the internal structure of megasequences includes sequence-stratigraphy analysis of the wave field tied-up to the geological data of drilling and geological surveys on the flanks of the Western Siberian basin (Yamal, Obsko-Laptevskaya ridge), as well as the on north-west of the Siberian platform within the Taymyr fold-thrust system. The article pays attention to the features of the geological structure of the Neoproterozoic-Paleozoic sequences, represented by the pre-cover (transitional) megasequence of the most ancient stratified deposits from metamorphosed rocks of the folded base to the sedimentary cover and Paleozoic (Vendian-Paleozoic?) orthoplatform structural-tectonic level (megasequence) of the sedimentary cover. The authors substantiate the development of the heavy (over 20–30 km) thick continental crust consisting of stratified Neoproterozoic and Phanerozoic deposits throughout Gydan and Taymyr. These deposits are typical for the north-east of Western Siberia. In the conclusion they describes the limited oil and gas prospects of Neo-Proterozoic and Paleozoic in the northeast of Western Siberia, which can only be associated with the most uplifted blocks of the northeastern parts of the inclined megaswells of the Obsko-Laptevskaya ridge and the flanks of the basin (South Taymyr, Western Taymyr, North Siberian monocline).
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Evaluation of a Non-Ionic Surfactant as a Potential Candidate for Enhanced Oil Recovery
Authors A. Mosallanezhad and S.B. HosseiniSummaryUsing emulsions for Enhanced Oil Recovery has increased in recent years. Emulsion injecting increases water viscosity and improves water displacing efficiency. Micro-emulsions also cause damage in reservoir, and due to the necessity of their minimal use, formation of stable micro-emulsions is a major challenge in EOR. The main objective of this study is to identify and describe stable micro-emulsions at various temperatures. In this work, phase behavior of micro-emulsions containing Glucopon 650EC, 2-Propanol, and synthesized oil, which itself includes Hexane, Decane, and Benzene has been investigated at various temperatures. Three sets of experiments were performed for EOR potential feasibility: Formation and injection water compatibility test, surfactant stability test, and relative phase volume measurement. Also, the effect of salinity on surfactant and micro-emulsions was investigated, and salinity optimization was performed.
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Updating of the Geological Structure of the Neocomian Deposits within the Novoportovskoye Field During Prospecting Surveys
Authors S. Khakimova, Y. Nefedov, I. Nizamutdinova, G. Shangaraeva and R. MunasypovSummaryIntegrated interpretation of borehole data and detailed 3D seismic operations at the Novoportovskoye field made it possible to fundamentally change the model of the geological structure of the main productive interval: to breakdown in detail the section of the wedge-shaped structure, to update the structure of all the strata of the Novoportovskoye group, the position of oil- and gas-water contacts, and tectonic disturbances that control the deposits. Under the conditions of lithologic-facies variability of lateral uniform deposits, lithologic-stratigraphic 1D log columns provide an extremely simplified model of real sections. The strata of the Neocomian clinoform sequence cannot be correlated, relying solely on drilling data. The similarity of the logging characteristics of the reservoirs often does not indicate the identity of the reservoirs, but only the similar facies environments in which these deposits accumulated. There is a lot of evidence for this statement in various regions of Western Siberia [ 1 ].
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Integrated Use of Georadar Radiometry and Sensing by Near-Surface Field Formation to Refine Seismic Data
Authors I. Perepletkin, V. Kuznetsov and Y. DolgikhSummaryPermafrost became the most urgent problem while exploration oil & gas fields in the Arctic Zone. Interferences from other high- and low-speed inhomogeneities makes it difficult to take into account all subsurface factors while making kinematic amendments of 3D seismic data, so it requires only complex approach. Nowadays we do not have generally recognized technology for inversion of traveltime data from heterogeneous shallow subsurface which guarantee correct interpretation of all low velocity zone factors and construction of real depth-velocity model. One of probable solutions is dynamically developing technology of ultra-wideband georadar survey in combination with a shallow modification of sounding by near field formation. Integrated use of the sensing by near-surface field formation and ultra-wideband radiometry will allow supplementing seismic data in areas complicated by the influence of the permafrost due to the fact that a direct forecast of the saturation nature of promising structural objects in a detailed analysis and interpretation of the data is possible. The effectiveness of method integration has been substantiated by the latest experimental studies and its realization possible at all stages of exploration, development and further exploitation of current deposit.
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