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GeoBaikal 2018
- Conference date: August 11-17, 2018
- Location: Irkutsk, Russia
- Published: 11 August 2018
51 - 100 of 114 results
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Improving the Quality and Reliability of the Seismic Image As a Result of the Detailed Velocity Model Restoration for the Complex Enviroment of the Siberian Platform
Authors D. Tverdokhlebov, A. Kleshnin, E. Kashirina, A. Batischeva, V. Korobkin, A. Chirgun, A. Filichev and S. GolopapaSummaryImproving the quality and reliability of the seismic image in the complex seismic and geological environments of the Siberian Platform is one of the main tasks in performing both seismic acquisitions and data processing. One of the key elements is the construction of a detailed depth velocity model using wide-azimuth 3D seismic data. There are various methods for constructing a velocity model of the medium in the geophysicists arsenal - based on surface, refracted and reflected waves. An integrated approach based on well-logs data can allow the construction of a detailed depth velocity model of the medium that can improve the quality of the seismic image in the time domain by better static corrections and the reliability of prospects focusing through depth migration.
The paper presents fundamentally different algorithms for recovering the velocities of the high-frequency current and a comprehensive approach to the construction of depth velocity model by the example of the area located in the central part of the Nepa-Botuoba anteclise in the Irkutsk region. The results of the production application of SWI, FWI technologies for near surface velocity and the use of nonlinear tomographic refinement of the velocity model with azimuth information taken into account are presented.
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Application of Multilateral Wells at Taas-yuryakh Neftegazodobycha LLC. Perspectives for Fields of Eastern Siberia
Authors A.S. Suturin, A.G. Yanyshev, R.B. Sultanov and V.A. GrinchenkoSummaryThe Srednebotuobinskoye oil and gas condensate field is one of the largest deposits in Eastern Siberia (RF). The structure of this field is characterized by the presence of an extensive gas cap,oil rim and underlying plantar water. Analysis of early production data showed the main difficulties associated with the development of reservoirs with contact reserves - gas-cone formation and early breakthrough of gas to the bottom of producing wells with low oil withdrawals. In this regard, Taas-Yuryakh Neftegazodobycha LLC has been actively developing new technologies for drilling and the exploitation of this large and complex field. This involves the construction of particularly long horizontal multiple laterls and operation of wells with a low depression.
This article presents results of construction and operation of multilateral wells. In 2017, the company drilled 3 multilateral well pilots with "fishbone" geometry. Among the subsidiaries of Rosneft Oil Company, leading the development of onshore fields, a record result has been achieved with 5,030 m penetration of the reservoir. The assessment of multilateral well production shows a 3.5-fold increase compared to standard horizontal wells.
To date, the first phase of pilot operation has been implemented:
- Selection of pilot sites, well design;
- Drilling wells with the selection of optimal technologies and determination of technological limits;
- Selection of pilot sites, well design;
- Evaluation of the actual productivity of MZS;
- Research of working intervals.
These works allow to drill high-performance multi-hole wells with high economic efficiency. The experience of our company in the construction of multilateral wells will allow us to make a more balanced decision in the dissemination of this technology at fields with similar geological and technical conditions.
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Seismogeological Model As a Tool for Making Business Decisions
More LessSummaryExploration of oil and gas fields of the Siberian Platform and other provinces is increasingly connected with the extremely high complexity of the geological structure and low rate of knowledge. There are significant geological uncertainties, the reduction of which is a key task for successful exploration and production drilling, the development system optimization. The comprehensive approach used by Gazprom Neft, described in the work, made it possible to increase the success of geological exploration and reduce capital costs due to a deeper analysis of the data.
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How to Avoid Pitfalls in Interpretation of 3D Seismic Data With Effects of Igneous Intrusion
Authors A. Batischeva, E. Danko, A. Petrov and A. MityukovSummaryIgneous intrusions have very difficult structure on Nepa-Botuoba anteclise. Earlier, when there were only archive 2D seismic data with well information it was possible only understand their locating. Because of the poor data quality it was not possible to study it correctly. However, after we received data of 3D seismic it became possible to study properly igneous intrusions and effects which they made on the layers under it. To understand morphology of the igneous intrusion and its effects on seismic data we made modeling, seismic attribute analysis and structural interpretation. In the result, understanding of igneous intrusion influence on the 3D seismic allowed to avoid pitfalls, and make correct structural and dynamic interpretation.
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The Finding Prospective Objects From Seismic Data by the Example of One of the Deposits of the Nepa-botuoba Anticline (NBA) of Eastern Siberia
Authors E.A. Danko, A.V. Gaiduk, V.A. Galiaskarov and E.I. GoguzevaSummaryThe article describes the approach of the interpretation of 3D seismic and well data of the hydrocarbon play in the region for the finding prospective objects and increases the resource potential of the Siberian Platform. Using the example of one of the areas in Eastern Siberia, the effectiveness of the described approach was demonstrated, the results were obtained.
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Sedimentation Conditions and Regional Sequential Stratigraphic Dismemberment of Vendian Terrigenous Deposits in the Southeast of the Siberian Platform
Authors E. Dolgova, V. Grinchenko, A. Yukhnevich, A. Gaiduk and N. RedkinSummaryThe Vendian terrigenous deposits are distributed practically on the whole southeastern part of the Siberian platform apart of paleo-elevations and basement heights. Many giant oil and gas fields (Chayandinskoye, Verkhnechonskoye, Dulisminskoye, Srednebotuobinskoe, etc.) are confined to the terrigenous complex one of them the giant Kovyktinskoe field with gas reserves of 1.9 trillion m3. But despite so many discoveries in the terrigenous complex, there are a lot of problems related to prediction of the distribution of the reservoir and its properties.
There are many problems not only at the stage of geological exploration work, but also at already exploited fields, which can lead to a significant reduction of the resources. To reduce risks during geological exploration it is necessary to understand the geological structure of the terrigenous complex and the features of its accumulation and facies variability. In this article, a step-by-step was considered accumulation of Vendian terrigenous deposits, conditions for complex formation were identified and regional sequence stratigraphic partitioning of the section was carried out, which in future can form the base for prediction of reservoir distribution zones with advanced reservoir properties.
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The Main Types of Perspective Objects of the Nepa-botuoba Anteclise and Features of Their Geological Structure
Authors A. Gaiduk, V. Grinchenko, A. Chirgun, V. Galiaskarov and A. FilichevSummaryMany oil and gas fields have been discovered in East Siberia, including in the area of the Nepa-Botuoba Anteclise. However, the degree of understanding of the distribution of these deposits remains low, therefore, the search for new hydrocarbon fields in the region requires the use of high-tech methods of work with geological and geophysical information.The greatest risks in the search for new hydrocarbon fields are associated with the presence of a collector. This is due to the lateral heterogeneity of rocks, secondary changes, mainly salinization, as well as other features of sedimentation. The key task of exploration in the Nepa-Botuoba Anteclise area is to search for areas of reservoir development with improved porosity and permeability values.
This article shows which objects are perspective on the territory of the Nepa-Botuoba Anteclise and their key characteristics, features of the structure and search features.
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Special Processing of Wide Azimuth 3D Seismic Surveys in Seismic Conditions of the Siberian Platform
Authors A. Kleshnin, D. Tverdokhlebov, A. Chirgun, A. Filichev and S. GolopapaSummaryThe work describes an approach to processing wide-azimuth 3D seismic surveys in the complex seismic conditions of the Siberian Platform. On the example of one of the areas in Eastern Siberia, the efficiency of special processing of wide-azimuth data was demonstrated. The features and advantages of the developed processing flow are compared with the standard approaches.
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The Foundation and the Bark of Weathering Within the Chon Group of Fields
Authors V. Pustylnikova, N. Sentyakova, N. Ivanova and V. VorobyevSummaryWithin the Chon group of fields, the petrographic composition of Foundation rocks and weathering crust was studied, the profile of the residual weathering crust and Foundation variability was determined and typed. The obtained results, after linking with GIS and 3D seismic data, can be used to predict the thickness of weathering crust, faults in the Foundation and refinement of its block structure, as well as in the reconstruction of the paleorelief of the crystal Foundation at the time of formation of basal horizons. The study of the profile of the residual weathering crust have led to the conclusion about the existence of arid climate at the period of its formation and accumulation of basal layers of the sedimentary cover, which in turn characterizes the type of the sedimentary basin, the composition of the original precipitation and their cementing substances, as well as, in some sense, determines the post-sedimentary processes.
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Sedimentary, Structural, and Migration Factors Improved Porosity and Permeability Values in Deposits Over the Basement Highs on the Nepa-botuoba Anteclise
Authors N. Redkin, A. Gaiduk, A. Petrov and A. MituykovSummaryDeposits in Ust-Kut horizons above the basement high are one of the most productive objects in carbonate sedimentary cover deposits in the territory of the Nepa-Botuoba Anteclise.
Despite the presence of search features expressed in the results of the seismic data, a unique model of the formation of the nature of improved porosity and permeability values does not yet exist.
The authors of the article analyzed the possible causes of the formation of improved properties in Ust-Kut horizons over the basement highs and formulated a conceptual model of the formation of deposits. The presence of improved porosity and permeability values in Ust-Kut horizons is associated with a combination of sedimentation, paleostructural and migration factors
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Problems of Interpretation Archive Seismic Data in East Siberian
Authors I. Shipilov, D. Tverdohlebov, A. Gaiduk and N. PopovaSummaryThe territory of East Siberian have been exploring since 60s years of last century till now days. A lack of productive capacity of computing techniques and imperfection of methods of seismic prospecting in last century didn't allow to set off fully the effect of complicating geological factors. This was the reason for the low quality of the stacks data. Follow-up active technological evolving caused to appearing qualitatively new type of seismic results, and, therefore, to the common heterogeneity of archive data, dependent of survey's year, so that must be considered during interpretation them
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The Results of the Gravity Survey in the Nalaykh Basin (Mongolia)
Authors B. Buyantogtokh, E.Kh. Turutanov and B. TengisSummaryAs a result of gravimetric studies, characteristics of the mesozoic structures and data on the morphological features of the submerged part of the crystalline fundament were obtained. According to the interpretation of gravity profile, Nalaikh basin has a complex block structure and it is divided into two main parts. The thickness of the Mesozoic deposits in the center of the basin is about 600 m.
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Tectonophysical Approach to the Analysis of Geological and Geophysical Data at the Kovykta Gas-condensate Field
SummaryIn the report the results of application of modern ways in the tectonophysical analysis of geological and geophysical data for identification of regularities in a fault structure of a platform cover on the Kovykta gascondensate field (GCF) are considered. The basis for research of sedimentary cover are the materials of 3D seismic and electromagnetic survey, the structural data and materials of digital relief model processing. As a result of the complex analysis the zone-block structure (ZBS) of the Kovykta GCF is established. It represents hierarchy of blocks which contact with each other on wide zones of short fractures concentration. The ZBS style is defined by domination of subhorizontal fault zones (layer-by-layer stripping) and subvertical zones of northwest and northeast orientations. The network of the fault zones was formed in four stress fields which correspond with the main stages of an adjacent Baykal- Stanovoy mobile belt development in the Paleozoic- Cenozoic. Some fields are reactivated in the Cenozoic under the influence of the gravitational processes connected with local lifted raisings of a relief. The zone-block structure of the Kovykta GCF is a basis for it's zonation on hydrocarbon productivity, overpressure zones, on degree of fracturing and types of stress state of rocks. The solution of this task will allow to receive additional substantiating for the choice of drilling site which can be passed without geohazards and with the prospect of detection of natural gas accumulation.
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Mapping of Complex Fractured-cavernous Overpressure Zones in the Sedimentary Cover of the Northeastern Part of the Angara-lena Step by Geophysical Data
Authors A.S. Smirnov, A.G. Vakhromeev, I.A. Shelokhov, V.V. Kasyanov, N.N. Yaitskiy and A.V. MakarovaSummaryWhen interpreting the 2D and 3D seismic data processed with standard graph, it is impossible to detect oil and gas reservoirs (fissured-cavernous and porous-fissured types) with high properties. The reason for this - the small size of caverns and fractures, saturated with fluids with abnormally high reservoir pressures (AHRP). In particular, in the south of the Siberian craton (the Angara-Lena step) by drilling at depths of 1.2-2.2 km in the geological section of the halogen-carbonate rocks, the presence of gas- and brine-saturated reservoirs of fractured and fissured-cavernous type was established. The reservoir fluid pressures are 2.3-2.6 times higher than hydrostatic pressures. Nowadays, due to increased interest of oil and gas companies and institutions to the study of fractured reservoirs in dense rocks of the sedimentary cover and crystalline rocks of the basement, methods for modeling the propagation of seismic (scattered) waves are actively developing. The paper is devoted to the special approaches in the processing technology - the interpretation of seismic data, which are aimed at an accentuated study of a natural fissure reservoir through a “cloud” of scattered waves, which gives a field independent of fluid saturation, a dataset that is somehow related to a fracture and cavernous - with a pore space. The fractured filtration system of the intersalt reservoir, having the same properties in the acoustic field as the above / lower-lying carbonate layers, in addition or in contrast to them, is additionally characterized by the parameters of anisotropy, inhomogeneity or mosaic laterally.
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Experience of Ground Penetrating Radar Application for Gold Exploration in the Eastern Sayan Geological Settings
Authors A.A. Otsimik, V.V. Leskov, V.V. Gomulsky and S.A. BezdenejnikhSummaryThe paper describes the geological aspects of one of the gold deposits of the Eastern Sayan, related to its structure and genesis. The technique and hardware used in geophysical studies are described. The results of Ground penetrating radar (GPR) studies and features of the field data interpretation are presented. The comparison of the GPR data with vintage transient electromagnetic data is shown. The criterias for gold ore mineralization zones and ore bodies identifying based on the results of geological and geophysical studies are described.
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An Aspects of Transient Electromagnetic Method in the Near Field Zone Resolution for Oil and Gas Exploration in the South of the Siberian Craton
Authors I.K. Seminskiy, I.V. Buddo and E.V. MurzinaSummaryOne of the most common electroprospecting techniques for the oil and gas exploration is the transient electromagnetic method in the near field zone (TEM).
The resolution of TEM (possibility of horizontally-lying layers separation) depends on rocks geoelectrical properties. The current exploration strategy of Russian Federation is oil fields exploration of groups 2 and 3 by geological structure. Hence the resolution assessment of the TEM for oil and gas exploration in the geological settings of the south of the Siberian craton is evident. It is possible to evaluate the resolution of the TEM using synthetic modeling. In this research, the capabilities of the TEM in respect of the oil and gas exploration in the geological settings of the Nepa and Kamov Archs, as well as the Angara-Lena step were examined.
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Geoelectric Model of the Section As an Integral Part of the Oil and Gas Fields Geological Model (Case Study From the Kovykta Gas Condensate Field)
Authors I.V. Buddo, A.V. Pospeev, I.A. Shelohov, N.V. Misiurkeeva, Y.A. Agafonov and A.S. SmirnovSummaryThe stages of geological exploration correspond to specific geological tasks, for which sequential complication is typical. At each stage of geological exploration, an appropriate set of research methods is used, optimal for solving the problems of necessary detail. Like complicating the set of methods, at each stage of geological exploration a geoelectric model is used - the result of electromagnetic exploration - with appropriate level of detail. In the paper, an example of the Kovykta gas condensate field is shown which represents the consistently increase the detail of geoelectrical models. Each level of detail corresponds to the class of geological tasks to be solved, starting from promising gas-saturated reservoirs mapping, ending with the fracture zones and possible geohazards while drilling prediction.
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Fractured Fluid-bearing Reservoirs in Magmatic Rocks Prediction According to Transient Electromagnetic Soundings Data
Authors A.I. Ilyin, D.V. Kolesnikov, I.V. Buddo, A.G. Vakhromeyev, I.A. Shelohov, Y.A. Agafonov and R.B. SultanovSummaryNowadays active cluster drilling of deep production wells is carried out at the oil and gas fields of Nepsko- Botuobinskaya anteclise. During the drilling, fluid-loss zones are fixed. Numerous geohazards are associated with the magmatic rocks intrusions. The volume of drilling mud lost reaches thousands of cubic meters. The mapping of fluid-saturated zones in magmatic rocks can be performed with transient electromagnetic soundings in the near field zone (TEM). According to the geological basis the magmatic rocks intrusion into the carbonate rocks should be accompanied by saline water saturation of fractures in the traps and host rocks which leads to abnormally low electrical resistivity. TEM survey allows delineating zones of fluid-saturated fracturing and, when comparing the drilling data and the resistivity of rocks, predict possible risks of drilling wells, eventually correcting the position of well clusters.
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Feasibility of Fault Zones Fluid Permeability Assessment From the Set of Geophysical Data
Authors N.V. Misyurkeeva, I.V. Buddo, I.A. Shelohov, A.G. Vakhromeev, Y.A. Agafonov, I.V. Gorlov and A.S. SmirnovSummaryThe paper shows approaches to investigating and mapping of the faults in the sedimentary cover, as well as evaluating their fluid permeability based on high-density geophysical surveys data: 3D seismic and 3D TEM survey. Due to the high spatial density and high vertical resolution, these techniques allow the faults mapping as well as fluid-permeability and colmatage evaluation.
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Estimation of the Oil Pipeline Interference for the Transient Electromagnetic Data Interpretation (Oil Field Production Stage)
Authors E.V. Murzina, V.S. Emelyanov, V.V. Gomulskii, A V. Pospeev and Y.A. AgafonovSummaryTransient electromagnetic method in the near field zone carried out within the dense observation grid is often used at the stage of field development, to determine the geoelectrical properties of the target horizons for further prediction of the reservoirs saturation. However, when electromagnetic soundings are carried out within the producing oil field, the interference of TEM data is unavoidable. Hence it is necessary to develop special approaches to interpretation of TEM data affected by pipelines. The paper presents the results of TEM data interpretation from a few oil field of Eastern Siberia.
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Magnetotelluric Data Interpretation for Highly Resistive Shallow Environment
Authors A.V. Pospeev and E. SenSummaryThe paper considered an approach to the magnetotelluric (MT) data interpretation regarding to the near-surface heterogeneity influence attenuation. The analysis of spatial conductivity distribution within the central part of Nepa-Botuobinskaya anticlise studied with transient electromagnetic method (TEM) in the near field zone was carried out. The geoelectric model was built based on typical quasi-longitudinal MT curve inversion of the south of Siberian craton. The model was adjusted by placing heterogeneities into the upper part of the section. Polarization curves for electric and magnetic fields had been calculated for this model with respect to the galvanic shift. Acquired data had been spatially filtered. According to the conducted research results the approach to the near-surface heterogeneity influence attenuation for MT data interpretation was proposed.
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Transient Electromagnetic Method Efficiency Assessment for Oil and Gas Exploration (Based on the Forward Modeling Results)
Authors Z.Y. Shobohonova, O.V. Tokareva, S.V. Kompaniyets, I.V. Buddo and V.V. GomulskiySummaryThe success of the geophysical methods application for oil and gas exploration depends on the reservoir physical properties contrast. To choose the applicable geophysical methods, geological and geophysical modeling is performed. The paper shows the methods and results of TEM data forward modeling for various HC-prospective reservoirs of Western Siberia.
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Reducing Uncertainties in the Elastic-velocity Model of the Upper Part of the Section Construction by Tem Data Applying
Authors I.A. Shelokhov, I.V. Buddo and A.S. SmirnovSummaryAreas of permafrost rocks distribution occupy about 5 million sq. km of Russia territory. When processing seismic data in areas with permafrost rocks, its influence should be taken into account. Ignoring the complicated structure of permafrost zone can lead to significant errors in prospective horizons structure. Static corrections calculation by conventional methods (by smoothing the variations of the travel time) sometimes can result in artificial synclines arise on the section. The authors propose an approach to the elastic properties of the upper part of the section recovering from Shallow TEM data.
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Transient Electromagnetic Data Forward Modeling Reservoir Saturation Assessment
Authors Z.Y. Shobohonova, O.V. Tokareva, V.V. Gomulskiy and I.V. BuddoSummaryThe transient electromagnetic method in the near field zone (TEM) is widely used for oil and gas exploration in the Eastern and Western Siberia geological patterns. To assess the possible effectiveness of TEM in certain geological settings, a special technique of forward TEM modeling has been developed. The paper shows innovative approaches to the TEM forward modeling. It is shown that the synthetic simulation of the TEM signals makes it possible to evaluate the possibility of separating promising zones with different reservoir saturation.
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Conditions for the Formation of Neoproterozoic Sedimentary Rocks of the Oselok Group in the Sayan Region
Authors Z.L. Motova, T.V. Donskaya and D.P. GladkochubSummaryWe present the results of integrated studies of clastic sedimentary rocks Oselok group in the Sayan region. On the basis of petrographic, geochemical and U-Pb (LA-ICP-MS) geochronological studies it was found that the upper and lower parts of the cut of the Oselok group reveal certain differences. On the basis of identified features, it is anticipated that during the accumulation of terrigenous rocks Oselok group a change of the geodynamic regime of the basin sedimentation.
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The Influence of Planetary Geodynamics on the Success of Geological and Technical Measures for the Development of Oil and Gas Fields
Authors D.V. Tomashev, M.V. Nelepov and A.A. PapotnayaSummaryThe analysis allows to draw a conclusion about the effect of planetary tectonic processes on local areas within oil and gas fields, as a result of which zones of increased fracturing are formed both in carbonate and terrigenous reservoirs.-Planetary forces, acting on tectonic elements of the first order, cause deformations in smaller elements up to the formation of a network of cracks and microcracks within the productive deposits.
The resulting network of cracks has a direction consistent with the planetary stresses and is identified as linear zones in the wells with the largest oil or gas production.
The obtained information should be taken into account when planning geological and technical measures: drilling, hydraulic fracturing, design of injection wells, etc.
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Forecast of the Current Phase State of the Hydrocarbon Accumulations of Ciscaucasia on the Basis of an Analysis of the Geodynamic Activity of the Scythian Plate
Authors D.V. Tomashev, M.V. Nelepov and A.A. PapotnayaSummaryThe genetic sequence of hydrocarbon accumulation locations inherent in primary hydrocarbon systems is often violated in nature. To forecast the current phase state of hydrocarbon raw materials during geological exploration and preparation of primary design documentation, including the development of deposits, it is necessary to consider in detail all stages of the geological development of oil-promising areas of the territory during which it is possible not only to form deposits but also their subsequent reformation and disbanding.
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Evaluation of 4D Effects Based on the Results of the Repeated Survey Within the Water Area of the Novatek Gas-condensate Field
Authors S.S. Sanin, V. I. Kuznetsov, Yu.N. Dolgikh and D.S. TataurovSummaryThe company NOVATEK performed in 2008–2010 the 3D seismic works within the aquatorial part of the gas condensate field.
The main geological tasks were the detailed exploration and forecast for the Cretaceous deposits’ reservoir properties.
To engage in development the new prospective targets in the underlying intervals, there was a 3D survey performed in 2017
Based on the results of the work, 2 sets of data were obtained for the same area within a time difference of 7–8 years, which provided the opportunities for estimating 4D effects of the tanks being in service all these years.
The report presents the results of modeling and analysis of the real 4D effects, characterizing the processes of development and operation, as well as pointing to the reserves of improvement of the efficiency of these processes.
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Formation Micro Imager (FMI) Processing and Interpretation in the Paleozoic Deposits
By S. ChizhovaSummaryStudying fracturing is a crucial aspect of pay zones prediction. Contemporary methods of studying rock formations allow to assess the fracturing of the formations examined and define their textural features. Formation Micro Imager (FMI) allows to solve the following challenges: identify the elements of structural abundance; define the angles of incidence and strike angles; identify thin bedded manifolds, determine the systems of fractures; determine the decompaction zones precisely; extract additional information about non core pay zones and select zones for testing. Formation Micro Imager (FMI) has already been used in geophysics, however, applying this method to effusive igneous sedimentary complex could solve certain unconventional challenges.
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Integrated Solution for Geological Modeling of Deposits. From Interpretation of Seismic to Structural Modeling With the Possibility of Estimating Uncertainties
Authors E. Volk and M. SafronovSummaryThe integrated solution implemented within a single interface and database has a set of innovative technologies for a full cycle of geological modeling, , from seismic interpretation to calculation of reserves, including on multivariate models, taking into account given uncertainties and risks.
The approach is based on the modeling graph - Workflow used to automate the process of modeling, updating and calculating the set of model realizations. The workflow is appropriate for the evaluation of significant contingent resources and for the reliable quantification of commercial reserves. It is also suitable for providing input to development plans and concept design choices, and for management of fields in early phases of production.
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Optimization of Field Development Into Account the Surface Networks, Through Integrated Modeling
By A. ZarovSummaryAt present, in conditions of unstable oil prices, the oil and gas fields development plans is associated with increasing efficiency and minimizing risks. The integrated model is single platform for optimizing development that, takes into account and the uncertainties accumulated in the geological and hydrodynamic models, and the limitations of the surface network. The paper contains an overview of the methods for constructing integrated models, and a description of their work. Data on possible program optimization algorithms are also included.
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Improvement of the Eastern Part of the Kovykta Gas Condensate Field Geological Model in the Light of the New Geological and Geophysical Data
Authors I.V. Gorlov, N.V. Misyurkeeva, I.V. Buddo, A.G. Vakhromeev and I.A. ShelohovSummaryThe modern geological model of the Kovykta gas condensate field is based on drilling more than 70 deep wells and 2D seismic surveys. In the course of carrying out high-density 3D seismic studies, transient electromagnetic soundings in the near field zone (TEM), deep drilling and geophysical well logging, the geological model undergoes adjustments. The paper shows the results of modern geophysical studies and drilling within the Kovykta gas condensate field, as well as their geological interpretation.
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Features of the Parfenov Reservoir Structure and Its Distribution Within the Kovykta Gas Accumulation Zone Based on Geophysical Well Logging and Tests
Authors P.N. Kokarev, I.A. Dikih and V.A. SerdyukovaSummaryFor the time being the Parfenov reservoir petrophysical model does not consider its content - sandstones differing in composition and properties. The paper describes the results of tests and well logs, which indicate the presence of a distinctly differentiated separation of the Parfenov reservoir-rocks by reservoir properties, both in area and in section. Conclusions inferred on the presence of Parfenov reservoirs with improved and deteriorated reservoir porosity and permeability. The wells of the Kovykta gas condensate field are ranked according to the type of the Parfenov horizon section.
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Secondary Vugs of Carbonate Rocks: the Role and Methods of Study
Authors V. Kolesov, A. Romantsov and D. NazarovSummaryThere are considered problems of revealing reservoirs while using classical deterministic approaches. In the article there was introduced an example of dissonance of permeability received by dynamic well testing and well logging data and core laboratory research data. We suggest a hypothesis concerning the presence of the tight filtering channels. There were presented the examples of the results of the core computer x-ray tomography. According to the results of the core x-ray tomography there was executed the cavernous voids classification. There was showed the importance of the oriented selection of the core samples for the cavernous voids filtrational characteristics examination. In the article there were performed the results of the reservoir porosity and permeability and filtrational experiments, besides, those results were compared with the results of examinations of the non-oriented samples. It was showed that the oriented samples permeability was significantly higher and water and oil saturation lower than the values reported earlier. There were considered the difficulties of the well launching according to the well logging data interpretation because of the rocks high variability.
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Hydrogeological Prerequisites for the Development of a Physico-geological Model of Zones of Abnormally High Reservoir Pressure at the Kovykta Gas Condensate Field
Authors A.G. Vakhromeev, I.V. Gorlov, A.S. Smirnov, S.A. Sverkunov and Yu.A. LankinSummarySince 1986, the authors have been working to substantiate the predictive-search complex of field geophysics methods that allow mapping of zones of increased water conductivity in the halogen-carbonate stratum of the Lower Cambrian and to approach the creation of a single physicogeological model of interfacial fractured carbonate reservoirs with abnormally high reservoir pressure (AVPD). Such a forecast is the basis for design decisions on the construction of production wells on the Parfenov horizon through inter-salt fissured carbonate reservoirs with the AVPD.
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Key Features of Processing for the Recovery of Dynamic and Kinematic Characteristics of the Wave Field
Authors D. Fedorova, V. Esaulov, O. Berkimbai, N. Zolotoi, P.S. Bekeshko, I.V. Shushkalova, E.M. Chub, A.S. Sorokin and P.P. YemelyanovSummaryIt is necessary to correctly execute the entire complex of modern processing procedures to obtain a qualitative result and the possibility of carrying out a further forecast using seismic data. It must be remembered that without an adequate solution of the kinematic problem, it will be impossible to restore the dynamic characteristics of the seismic record, and, consequently, to fulfill the forecast of the filter and capacitance properties in the inter-well space.
Within the framework of this work, the problems of restoring low frequencies of a useful signal and minimizing the influence of the complexly built upper and middle parts of the section were solved. The construction of a detailed anisotropic depth-velocity model and the implementation of anisotropic Pre-Stack Depth Migration, as well as the application of Robust Surface Consistent Decon and Overburden Compensation have made it possible to obtain data suitable for solving the geological tasks
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Perspective Ways to Improve the Accuracy of Measurements in Modern Gravity Prospection
Authors D. Andreev and D. MuhamadievSummaryThe maximum accuracy of field gravity measurements is currently needed to solve the following geological tasks: gravimetric search for hydrocarbon deposits, karst detection, monitoring the development of gas fields, deposits of high-viscosity oils and natural bitumen, monitoring the underground gas storage facilities operation, monitoring geodynamic sites of nuclear power plants. Improving the accuracy of gravimetric surveying is possible in several ways: preliminary testing of gravimeters at a certified gravimetric range, additional thermal insulation of gravimeters, rational equipment of gravimetric points, gravimeters protection from atmospheric influences and vibrations during transportation, high-precision geodesy. When carrying out gravimetric monitoring, in addition, it is necessary to take into account changes in the relief in the near observation points zone and changes in soil density (for example, due to changes in humidity). The above technological methods have been tested in practice and improved over the past decade by the specialists of the “TNG-Kazangeophysica” LTD in the Far North and Eastern Siberia harsh conditions.
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About Requirements to the Quality of the Field Material for Seismic Survey Production
By V.M. BolbatSummaryThe information about the current requirements of the Customers for the accuracy of the removal of the PGN, the evaluation of the effect of the angle of inclination of geophones on the quality of seismograms, the allowable spread of geophone impedances, the acceptable level of interference, the attribute estimation of data quality, the number of accumulations in the vibroseis are provided.
Suggestions on changing the allowances of conservative instructions of Customers are considered.
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Impulse Seismic in Eastern Siberia, New Approach
Authors V. Detkov and P. BalandinSummaryThe experience of seismic syrveing in the water areas of Eastern Siberia, in particular, on the rivers Biryusa, Chuna, Angara with the use of electromagnetic sources “Yenisei-VEM-50” and “Yenisei-VEM-100” showed that with very noisy field data as a result of geophysical processing, time sections suitable for solving geological problems. The transfer of the technique of continuous (dynamic) excitation from the water area to land could greatly simplify the technique of high-density imaging.
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Implementation of Projects in Eastern Siberia, Best Practices
More LessSummaryEvidence on the best practices, from the experience of GEOTEK -East Geophysical Company Ltd. are presented.
The experience of using environmentally safe pulse sources of excitation of the Yenisei line is considered. Evidence on the results of the application of the UniQ technology - supercompact seismic prospecting 3D. The experience of using the air laser scanning technology at the facilities in Eastern Siberia is highlighted.
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Increase Work Safety for Seismic Surveys
More LessSummaryPriority for PJSC “GEOTEK Seismic exploration” is the health and safety of the company’s employees, creating the necessary working conditions - competent and safe organization of the workplace, raising the competence of employees in the field of labor protection. The experience of applying the 5-year strategic model of the function in the field of labor protection, industrial and environmental safety is considered. As a result of the implementation of the strategy, it has been possible to reduce injuries fourfold in the last three years.
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High-resolution Seismic in Siberia and 3D Surveys in Transit Zones
By V.M. BolbatSummaryEvidence on the work experience of PJSC GEOTEK Seismicservices technology on high-resolution seismic exploration technology in Eastern Siberia and Yamal-Nenets Autonomous District (YNAD) are presented. The applied data collection and processing systems, the quality of the source material.
The experience of summer work in transit zones with the use of an aqueous modification of a pulsed electromagnetic source VEM-50 is considered.
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Integration of Different-scale Geological and Geophysical Data for the Geosteering Wiring at Chona Project
Authors V.A. Fagereva, K.W. Zverev and P.P. YemelyanovSummaryThe integration of the methods gave an opportunity to work out the most complete model of the spatial distribution of the facies of the B13 formation. Changes in the sedimentation model allowed to determine the most probable zone for the reservoir and to correct the trajectory of the horizontal wellbore.
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Multidisciplinary Approach for Petroleum Play Reconstruction of Dislocated Heterogeneous Carbonate Reservoirs Within the World's Most Ancient Riphean Formation
Authors R. Khusnitdinov, D. Kalacheva, N. Morozov, A. Vazaeva, R. Oshmarin and S. NaumovSummaryThis paper concerns the variety of geological uncertainties of unique ancient carbonate (fractured crystalline dolomite) reservoir. 1st phase of the entire project is nowadays successfully prepared to development, but it took more than 30 years, since the relevant technologies were obtained. 2nd phase of this project being poorly studied includes up to 30% of resources and is located 50 km to the East. Key challenge is connected to very complicated reservoir geometry and internal structure, which is characterized by uncertain stratigraphic and reservoir boundaries and blocks saturation.
The main objectives of this investigation are to design, to perform and to analyze research program based on historical wells core and fluid samples and, as a result, to reconstruct petroleum play for this Eastern part of the field in order to organize most effective exploration activities.
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A Successful Implementation of Diving-wave Refraction Tomography for Near-surface Velocity Model Building in East Siberia
Authors O. Berkimbay, P. Bekeshko, A. Sorokin and I. SafarovSummaryThe near-surface of Ignyalinksoe field is characterized by its complex structure. High velocity contrast anomalies related to thrust faults create challenges for seismic data processing and further quantitative and qualitative seismic interpretation. The compressional velocity of the near-surface varies between 1000 and 6000 m/s. It is widely recognized that inability to properly resolve anomalies at the upper part of the initial velocity model can lead to artefacts at later stages of velocity model tomographic updates. These artefacts can then cause poor imaging of the target during depth migration and signal distortion.
Due to the reasons mentioned earlier it was decided to implement Diving-Wave tomography for PSDM velocity model building at the near-surface. This is the first time of application of this technology for the complex conditions of East Siberia. DWTomo is a 3D tomography which can resolve complex high-contrast velocity anomalies.
The obtained image obtained after the Prestack Kirchhoff Depth Migration with DWTomo incorporated at the top of the model shows a dramatic improvement compared to the previous processing. The negative impact on the amplitudes and structure of the target horizon is noticeably minimized.
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Structural Framework and Tectonic Settings of Frontal Part of Predpatom Fold-belt (Ignyalin Area)
Authors A.A. Iskhakov, D.V. Khipeli, S.A. Korneeva, A.A. Aseev, V.S. Vorobev and A.V. MigurskySummaryThe paper explains the results of structural and paleotectonic interpretation of well and 3D seismic data of the frontal part of Predpatom fold-belt (Nepa-Botuoba arch). Geological support of seismic data processing allowed to make a detailed interpretation of faults and shears and identify the sequence of fault zones development.
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Myths About Reefs. Experience in the Investigation of the Geological Structure of Carbonate Deposits Using Seismic Data
SummaryThe article describes the most common myths about the interpretation of seismogeological data in reef reservoirs. They are illustrated by examples of several fields in the Timan-Pechora, the Caspian Sea and East Siberian regions. These include such thoughts as “there are no reflections inside the reefs”, “the reef has a homogeneous internal structure”, “organogenous structures are always visible on the seismic section”, “reefs in the presence of a section will have the greatest prospects in terms of oil and gas in carbonate section ”and others. Each thesis is illustrated by an example obtained by the authors, from the experience of working with bioherms in the seismic projects. In each case it is necessary to search for the pattern in view of the degree of knowledge, the quality of seismic materials and the complexity of the reservoir. However, the universal key to understanding any reef reservoir can be a detailed approach to seismic data processing, Rock Fisciss analysis, inversion and complex seismic geological interpretation.
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Suppression From the Seismic Data of the Multiple Diffracted Interference Waves From River Networks Reverberating in the Upper Layer
SummaryThe combination of specific near-surface conditions associated with the shape of river banks, as well as the presence of a sharp jump in the acoustic impedance under these rivers, such as salt lenses, leads to the formation of multiply diffracted interference waves reverberating in the upper layer and appearing on seismic data as repeatable diffractions with peaks, which are focused in the footprints of the rivers after migration. These prints repeat the shape of the rivers and are clearly visible on horizontal time slices in different time intervals.
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Rock Physics Study of the Complex Terrigenous Reservoir of One of the Deposits of Eastern Siberia
Authors A. Shcherbakova, S. Zakharchuk, L. Abdrakhmanova, L. Kibalchich, N. Zolotoi, S. Frantsuzov and V. VorobievSummaryRock physics model building and geological stochastic modeling as a route to increasing of the reliability of the seismic reservoir properties prediction of complex terrigenous deposits of Vendean age. Application of the methods proposed in this paper allowed to choose the optimal approach to the interpretation of seismic inversion results, as well as to estimate the uncertainty factors of the obtained model, related to the effect of complex geological and geophysical conditions in the area.
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Scanning the Earth - a Comprehensive Analysis of Borehole Images and Core Data. Case Study of Vendean Clastic Formation of Eastern Siberia
Authors A. Islamov and N. BelyaevaSummaryVendean clastic formation of Nepsko-Botuobinskaya anticline is one of the most complex reservoirs of East Siberia of Russia. Main uncertainties related to prediction of reservoir rocks by standard well logs and limited predictability of current geological model. By using integrated approach to the analysis of the Core data and Logs, with borehole images (FMI) as tool for this integration, comprehensive analysis performed, including from detailed depth-matching to complex sedimentological analysis of reservoirs. Detailed sedimentological description of Core was improved by adding information of dips and azimuth of interpreted sedimentological surfaces. This information gives us understanding of the direction of paleocurrents which help in facial prediction and reservoir geometry analysis.
As a result, flow directions trends within the lower basal part of Vendean section shows strong dependency with existed relief and paleovalleys. In the middle part of lower reservoir image logs confirmed our conception in regional paleoslope direction. Upper part of the lower reservoir shows bimodal reversal directions of cross beds, which gives along with texture features of Core influence of tidal activity of the sea and shift from continental area to transitional zone. Upper reservoir shows very different flow direction from the expected, which can be explained by transformation of territory which is also shows by well-to-well correlation based on sequence stratigraphic principles.
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