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Tyumen 2021
- Conference date: March 22-26, 2021
- Location: Tyumen, Russia
- Published: 22 March 2021
61 - 80 of 88 results
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Full Wavefield Reverse Time Migration
Authors M Davydenko and D.J VerschuurSummaryFull wavefield reverse time migration allows to utilize mutliple sacttering and handle complex subsurface models.
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Predictive Assessment of Hydrocarbon Accumulations in Permian-Triassic sediments by The Method of Basin Analysis in The Water Areas of The Central Caspian Oil and Gas Region
Authors R.N Mustaev, R.A Mamedov and E.S GaponenkoSummaryThe Central-Caspian oil and gas area is almost entirely located in the water area of the Middle Caspian and tectonically encompasses the Middle Caspian system of arched uplifts and the North Absheron depression. The main productive complexes are Triassic and Jurassic deposits. The most probable areas of HC accumulation in Jurassic reservoirs in the Central-Caspian oil and gas area are located mainly in their near-edge parts. For the complex as a whole, the share of liquid hydrocarbons in the reservoirs is about 38% for the second type of kerogen and the share of gaseous hydrocarbons is 62% for the third. In the Triassic complex, hydrocarbon accumulations predicted mainly in the southeastern and central parts of the Central-Caspian oil and gas area, to a lesser extent in the near-field. The share of liquid hydrocarbons in the predicted accumulations is 80%, respectively, with the second type of kerogen, and the share of gaseous hydrocarbons was 17% with the third. The modeling results made it possible to identify the main hydrocarbon systems on the territory of the Central-Caspian oil and gas area, and the obtained data are consistent with the actual data obtained in the course of longterm exploration work in the region.
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Informational Capabilities of New Technologies for Coring and Petrophysical Studies of Isolated Core
Authors V.G Mamyashev, B.Yu Khairullin and T.V MamyashevSummaryThe analysis of new technologies for petrophysical studies of discrete-isolated core and its information capabilities is presented. It is shown that in terms of information capabilities, the core sampled using the discrete-isolating technology is superior to the core sampled using oil-based solutions. Highly effective methods for controlling the quality of coring and controlling the content of the isolating agent in it by the chromatographic method are proposed.
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Test Results of Integrated Interpretation Technology of Geological-Geophysical and Field Data for the Purposes of Fracture Zones Prediction and Evaluation of The Rupture Anomaly Conductivity by Scattered Waves
Authors S.S Sanin, A.A Voronin, A.V Kirichek, V.I Kuznetsov and Yu.N DolgikhSummaryAt the seismic data complex interpretation stage we outline the geometric boundaries of tectonic deformations and make a qualitative prediction of their properties. At the same time, the fault has a certain zone, which includes not only the tectonites of the fault shifter, but also significantly large volumes of rocks where there are plastic and rupture deformations genetically associated with the disorders formations. Such zones can be both fluid permeable and fluid impermeable (non-conductive). According to theoretical concepts, fluid permeable fractures and companion fracture zones appear in the scattered waves with the increased amplitude values, and the fluid impermeable faults do not contain open fractures and do not appear in scattered waves. Forecasting and assessment of the fracture properties and fracture zones based on the scattered waves is possible with the specialized data processing technology from the standard observation systems using the Reflected wave CDP Method (CDP). The report demonstrates the testing results of the specialized FractureCSP processing technology and the application of the developed method of integrating the obtained results with geological, geophysical and field data for the purpose of predicting the fracture zones and assessing the fracture deformations conductivity by scattered waves.
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Deconvolution of Ground Penetrating Radar Data in The Study of Highways
Authors A.A Matyushenko, A.A Ivanov and A.I PosereninSummaryOne of the most significant problems of GPR in the study of roads is a large number of low-contrast boundaries that need to be traced at depths of 5-10 m with a radarogram resolution of 10-20 cm. Within each layer, interlayers with a thickness of several centimeters can be distinguished, the presence of which, with sufficient the resolution of radarograms can be indirectly established by the wave field between extended reflective boundaries. Separation of closely spaced reflected and diffracted waves on radarograms is an important task of GPR. Deconvolution is aimed at increasing the resolution of GPR. The paper shows the results of applying deconvolution to ground-penetrating radar data in the study of highways.
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An Example of Neural Network Algorithm Application to Determine Lithology Using Well Logging Data in a Terrigenous Section of The Republic of Tatarstan
Authors J.M Davronov and B.V PlatovSummaryAccurate determination of lithology based on well logging data is an important task in the study of oil and gas fields. Large fields can include hundreds of wells, which affects the time required for interpretation. In this work, the authors tested the use of a neural network to determine lithology from well logging data. The geological structure of considered area includes rocks of the crystalline basement of the Archean-Early Proterozoic age and a sedimentary cover, represented by deposits of the Devonian, Carboniferous, Permian and Quaternary systems. Oil deposits are distinguished in the deposits of the Upper Devonian and Middle Carboniferous (Adbulmazitov R.G. et al, 2007). For the analysis, the authors selected a productive interval of Devonian terrigenous deposits. There are three learning models: “supervised”, “unsupervised” (self-learning), and mixed (Darpa, 1998, Hertz et al, 1991). To solve the problem of finding the best porosity value set in this article, the supervised model was used. This means that during training, the neural network relayed on "correct answers" for input data. In the process of learning, the weights of connections between neurons in the network were adjusted in the way that the network gives responses closest to the correct result.
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Technological Parameters Analysis of Heat Treatment of Well Through a Downhole Heater
Authors E.O Butorina, A.S Golubov, Y.A Donskoj and A.P RatushnyjSummaryOne of the most important directions in the national Russian energy policy strategy until 2035 is the development of hard-to-recover reserves. In the word «hard-to-recover reserves» such categories as bituminous, extra-viscous, high-viscosity oil are included. In the practice of operating mechanical wells, the issue of introducing thermal effects by heating oil with a heater without shutting down the well itself becomes important. At present, the theoretical and working field experience with downhole heaters has been accumulated, however, no systematic ideas about the effectiveness of this kind of method have been presented. This paper considers the issue of analyzing the thermal effect in the well during the operation of the downhole heater and determining the most optimal operating conditions. In the study, the first stage was to assess the effect of heating the fluid and the bottomhole zone of the productive formation on its physico-chemical properties. At the second stage, the technological characteristics of the heater were calculated depending on the individual oil field properties. As a result of the work, it was found that this method is applicable for shallow, vertical wells with high-viscosity oils with a reservoir temperature below 30 degrees.
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Specialized Structural Mapping and The Specifics of its Application for Reconstructions of The Stress-Strain State of Rocks within Structure Complex Hydrocarbon Fields
Authors K.Zh Seminsky, Yu.P Burzunova, A.K Seminsky and A.S CheremnykhSummarySpecial structural mapping based on the structural-paragenetic analysis of tectonic fractures in rocks is used to decipher the fault-block structure of the earth's crust using special types of paragenesis (the result of staged fracturing). Using the example of the Kovykta gas condensate field, it is shown that the method is effective for reconstructing the stress-strain state of complex structure hydrocarbon fields, since for its application, it is sufficient to have data only on the orientation of the fractures (azimuth and dip), which can be obtained by attributive analysis of the seismic information cube. This made it possible, using the data of detailed 3D seismic, to establish the structure of the discontinuous network formed during the tectonic development of the territory, to detail the type of stress state for the sedimentary cover and individual rock complexes, and also to make zoning in terms of the intensity and nature of disturbance by fractures. In practical terms, these materials represent a reliable basis for constructing tectonophysical models of the dislocation of licensed areas, which, along with the available production information, should be the basis for predicting the conditions for drilling exploration and production wells.
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Prevention of Wells Self-Stagnation in The Achimov Deposits of The Urengoyskoye Gas Field
By M.D VoronovSummaryThe accumulation of fluid at the bottom of producing gas wells is one of the most pressing problems in the fields of the Far North, which are at the final stage of development and gas production. Water in a vaporous form comes from the reservoir into the well together with gas, condenses, and in the case of the upstream velocity in the column below the critical value, flows down to the bottom of the well. The accumulation of borehole water, which occurs at gas flow rates below a certain critical value, seriously complicates the technological process of gas production, dramatically reduces well flow rates up to spontaneous shutdown. This problem becomes more and more urgent every year, as the fund of such spontaneously stopping wells becomes more and more every year. One of the promising technological solutions to support the work of producing wells is the equipment of the trunk with concentric lift columns.
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Forecast Assessment of Hydrocarbon Accumulations Within The Western Kuban Oil and Gas Region
Authors Yu.V Scherbina, A.A Markin and D.A UrusovaSummaryTectonically, the West Kuban NGO corresponds to the Indo-Kuban forward trough, which borders the folded structure of the Northwestern Caucasus. The deflection is made synorogenic molasse formations of Maykop and Neogene-Quaternary the. In cross-section, the West Kuban trough is characterized by asymmetry: the southern side is narrow, steep, complicated by geosynclinal folding; the northern side is flat, wide, and slightly disturbed. 128 oil and gas fields, including 90 oil and gas, 23 gas, and 15 gas condensate fields, have been discovered within the Western Kuban OGR
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Evaluation of The Applicability of The Technology of Gravimetric Correction of The Depth-Velocity Model of The Environment by Means of Synthetic Modeling
Authors T.A Mingaleva, G.D Gorelik and O.F PutikovSummaryIn this work, on a synthetic model, an algorithm for correcting the velocities of elastic waves in rocks is tested using information on densities obtained from gravimetric materials using inversion. The task is relevant for hard-to-reach and poorly studied areas. It is assumed that, due to the statistically significant dependence of the velocity and density properties of rocks, the density model can improve the results of structural inversion of seismic data and improve the quality of building a depth model.
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Technique for Reconstructing The Acoustic Logging Curve for Determining the Elastic-Mechanical Properties of Terrigenous Reservoirs on The Example of Field in The Perm Krai
Authors A.S Muryskin and A.S NekrasovSummaryCurrently, information on the mechanical properties of collectors is becoming more and more relevant. One of the sources of this information can be acoustic logging. However, in many old fields, such studies are not available in many wells. The article describes a technique for reconstructing the acoustic logging curve based on the results of neutron logging from a standard set of geophysical well logging. The studies were carried out on terrigenous reservoirs of the oil field of the Perm Krai. Comparison of synthetic and real acoustic logging curves is made out. An algorithm is presented for calculating the elastic and mechanical properties of rocks (such as Young's modulus, shear modulus, Poisson's ratio) from a synthetic acoustic logging curve. The algorithm was implemented in software using the Lazarus IDE in the Object Pascal programming language. The implemented algorithm allows obtaining valuable information about the elastic-mechanical properties of rocks for building a geomechanical model of a reservoir or creating a hydraulic fracturing design. A comparison of the results of determining the elastic-mechanical characteristics between the real and synthetic curves is given, as well as the results of the core analyses. Conclusions are made about the correctness of the application of this technique.
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Automation of Process of The Setting Up Well Model in Updating of The Integrated Asset Model for Wells Operated by Sucker Rod Pumps
Authors K.I Muryskina and A.S MuryskinSummaryA well model is one of the important elements of the integrated asset model (IAM). The nodal analysis method shows the both reservoir and well (deep-pump equipment) operation point according to VLP/IPR intersection. The IPR curve characterizes the ability of the formation to supply fluid to the wellbore under the influence of the difference between reservoir and bottom-hole pressure, the VLP is a characteristic curve of the lift column that determines the flow movement in the well from the bottom hole to the wellhead. Both curves represent the bottom-hole pressure and flow rate functional relationship. The IPR and VLP intersection point is the subject of nodal analysis research. There is the condition of pressures and flow rates equality for the curves at this point, so the operating point characterizes the efficiency of the well/reservoir system. This article considers an algorithm for automated selection of the operating point of VLP and IPR curves intersection using the Petroleum Experts Prosper software. The automated selection process is implemented using the VBA script in in the MS Excel. By this stage the program has been applied only for wells operated by sucker-rod pumps.
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Petrophysical View on The Differentiation of Reservoir Properties of The Vasyugan Formation
By B.N EnikeevSummaryIn the conditions of Western Siberia, the problem of assessing the saturation of low-resistance reservoirs is widely known (often explained by a complex of operating factors from the content of ferruginous or clay minerals to fracturing). The problem of the difference in the physical properties of the upper and lower Vasyugan members is also popular (the latter has a reduced resistance, regardless of its productivity). The report puts forward ideas about the specifics of the studied object based on empirical data, analyzes various considerations and hypotheses about the petrophysics of this object, and presents the results of visual and regression analysis.
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Transient Electromagnetic Method Application for Waterbearing Reservoir Mapping in The Republic of Sakha (Yakutia)
Authors A.A Otsimik, O.V Tokareva, A.I Ilin, I.V Buddo, V.A Lapaev, A.N Belysh and A.N BoshenkoSummaryThe transient electromagnetic method in the near field zone in shallow mode (sTEM) has established itself as an effective method for mapping aquifers in the territory of Yakutia. This is well known that in this region permafrost rocks can negatively affect the water availability of reservoirs developed in the upper part of the section. To map of the permafrost distribution and the position of water-bearing reservoirs the sTEM survey was carried out, capable of studying the geoelectric structure of the section to depths of 500 m. The relevance of the study is due to lack of technical water for reservoir pressure maintenance in the botuobinsky horizon. The waterbearing reservoirs prediction approach is based on a comprehensive analysis of geological and geophysical data (seismic, electromagnetic, drilling data and geophysical studies in wells), allows you to recommend areas of well location for technical water supply, to predict the intervals of possible geohazards during drilling.
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Comprehensive Approach to Study of Inherited Forming of Middle and Upper-Jurassic Sediments on Example of Tevlinsky-Russkinsky Field Formations US2, US1
Authors D Alexandrov, I Peshkova and V VingalovSummaryZonal genesis model of upper Tyumen and Vasyugan suite sediments (YuS2 and YuS1 formations) is provided. Cyclic depositional environment changes, local paleotopography aspects and local secondary reprecipitation caused by high-energy water steams determine facial zoning that was described.
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Geophysical Studies of Permafrost Within The Oil and Gas Fields in The Yamalo-Nenets Autonomous Okrug (Yamal Peninsula)
Authors N.V Misurkeeva, I.V Buddo, A.S Smirnov, Y.A Agafonov and I.A ShelokhovSummaryThe challenging climatic and engineering-geological settings of the Yamal Peninsula, located in the permafrost zone, significantly complicate the development of the region. The permafrost section is characterized by a complex structure. The section of the Yamal Peninsula to a depth of 500 m was studied with transient electromagnetic method (TEM). A thick stratum of icy permafrost rocks, a large number of taliks of various types have been mapped. In the thermokarst lakes zones, which are an active source of methane emissions into the atmosphere, vertical resistivity anomalies penetrating the permafrost strata were mapped.
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Additional Capabilities of Geosteering in 3D Geomodel Environment
More LessSummaryPaper summarizes experience of navigating horizontal wells using general propose 3D geological models. Advantages over simplifies geosteering techniques based on simplified 2D representations are duscussed.
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Development and implementation of a numerical solution for modelling the hydraulic fracturing process as part of an integrated geomechanical modelling system
Authors M.S Eryashkin, F.F Khusnutdinov, S.V Chaynikov, E.V Danilov, A.V Abramovich and A.Yu PetukhovSummaryHydrofracking crack (HF) behaviour near tip determines the local dynamics of the propagation front and, consequently, affects the overall geometry of the HF. Several physical mechanisms can compete for the determination of the behaviour near the crack tip. Presented research work considers the simultaneous interaction of crack resistance, fluid viscosity, and filtration, which together cause the solution to change at multiple scales in the fracture tip region. Research techniques described unique asymptotics to determine the position of the crack vertices and speed up the model calculation process.
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