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GeoBaikal 2018
- Conference date: August 11-17, 2018
- Location: Irkutsk, Russia
- Published: 11 August 2018
41 - 60 of 114 results
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Differentiation of Petrophysical Properties of Rocks As a Function of Facial Affiliation
Authors I. Sysoev, N. Popov and D. GlushkovSummaryThe present work is dedicated to the study of poroperm and surface properties, determination of relative permeabilities and displacement efficiency on core samples of various sizes, taking into account facial zonality. Based on the research: the differentiation of poroperm and surface properties of core depending on the facial accessory was established; presence of scale effects was established; recommendations on the justification of the displacement efficiency, taking into account the confinement to different facies have been developed.
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Methods and Results of Terrigenous Reservoir Log Interpretation of the Nepsky Arch Central Part, Eastern Siberia
Authors D. Leznin and D. ShabrikovaSummarySiberian craton is one of the most important mineral resourses bases in Russia. However, because of compound geological structures, the area is not explored properly. Even the most examined areas have unresolved geological problems. One of these is the correct prediction of oil-and-gas presence and reservoir quality discrimination of terrigenous deposists in Vendian oil producing play.
This article focuses on development of methodical approach and complex log interpretation algorithms for reservoir quality discrimination, saturation estimation and determination of porosity, shaliness and oil saturation factor in licensed area of the Nepsky arch central part of Nepsko-Botuobinskaya anteclise. In practice, applying of this methodical approach enabled to determine reservoir properties and to increase the accuracy of porosity and permeability estimation from the logs data.
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Complexing of 2D MOGT Seismic Survey and High-precision Gravity Prospecting for Amendment of Static Corrections by the Example of the Severo-nakanovskaya Area
Authors A.V. Shargorodsky and S.V. GachenkoSummaryThe perennial seismic work carried out under the conditions of the salt tectonics of the sedimentary cover, as well as the saturation of its trap intrusions, showed the low efficiency of the traditional methods of wavefield correction, based only on seismic characteristics. The involvement of other geophysical methods, such as electrical prospecting, and magnetic prospecting, with the exception of special cases, did not solve this problem. Similar problems are, in particular, for the areas of the south of the Siberian platform, on the work sites of the Irkutskgeofizika enterprise and other organizations. The application of the presented method of correction the static corrections made it possible to minimize the differentiation of the wave field at the ambiguous sections of the preliminary time profiles
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The Use of the Complex of Electromagnetic Soundings for Study of Electrical Conductivity of Bottom Sediments of the Lake Baikal
Authors M. Shkiria, S. Tereshkin, Yu. Davydenko and M. PetrishchevSummaryThe study of the bottom sediments of the Lake Baikal is part of a wide scientific field devoted to the study of the deep structure of the Baikal rift zone. Studies in this direction have been conducted since the middle of 20th century. The study of the bottom of the Lake Baikal is a rather complicated process, connected with many technical difficulties. In conditions of a deep water body it is very difficult to extract whole samples of bottom sediments for their further analysis. In this connection, the application of remote methods of investigation of the sedimentary stratum, for example, geophysical methods, is an urgent topic.
One of the solutions to this problem is the use of the complex of electromagnetic soundings to study the section of bottom sediments of the Lake Baikal in terms of electrical conductivity. An integrated approach with the use of magnetotelluric sounding technology and the method of electromagnetic soundings and induced polarization makes it possible to perform studies on bottom sediments at depths of the reservoir from 0 to 2 km. It allows to determine the distribution of the electrical conductivity of bottom sediments at depths of up to 5–7 km and the structure of the conductivity of the underlying rocks or their specific resistance.
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On Application of Assisted History Matching to Reliable Production Forecasting
Authors N. Kolesov, E. Kropachev, E. Sechenina, D. Samsonov and A. ChuprovSummaryThis paper presents a workflow with application of assisted history matching tool for updating and improving reservoir models. In this approach the best-matched reservoir model or an ensemble of models is selected for production forecasting. Furthermore, the convergence of the reservoir model is rated by History-Matching Assessment Form proposed by the authors. This allows the user to visualize and control the selection of the most reliable production forecasts. Afterwards, a set of final production forecasts with uncertainty assessment is made based on ensemble of best-matched reservoir models. The proposed workflow was applied to a large producing field in Eastern Siberia. It shows the usability and meets production forecasting challenges. In addition, the method can improve understanding of uncertainty of a target formation to revisit field development strategy. This helps to obtain correct well performance for acceptable history match and production forecast. Up to threefold speed-up is reached as a result of replacement of manually corrected and time-consuming history matching by automated iterations using assisted history matching software. By analogy, it is possible to apply the workflow to development projects where reservoir parameters often tend to have wide variability, particularly those cases that are in lack of formation uncertainty studies.
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Complex of Geophysical Methods for Studying the Geological Structure of the Intrusion of Dolerites (Trapps) at the Srednebotuobinskoye Field
Authors O. Krokhaleva, M. Shapovalov, E. Goguzeva and V. GrinchenkoSummaryThe paper presented the results of the complexation of geophysical methods for studying the geological structure of dolerite intrusions are presented in order to minimize the complications in the construction of wells.
When studying the problem of absorption of the washing liquid, it was concluded that there are zones with different properties. The author has carried out an analysis of historical data, geophysical research and their reinterpretation. The results of application of the high- tech GIS complex in the study of intrusion properties are shown.
Based on the results of the study, a geological concept of the structure of the trap body at the Srednebotuobinskoye oil and gas condensate field was formed.
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Determination of Methods for Revealing a Layer of High Viscosity Oils on the Example of Srednebotuobinskogo Oil and Gas Condensate Field
Authors E. lukyantseva, I. Oparin and A. KobyashevSummaryThe physical properties and composition of oil within the same reservoir do not always remain constant.
Changes in the properties of oil in the deposits depend on many factors: the Genesis of reservoir fluids, reservoir depth, thermobaric regime and other factors.
The viscosity of the oil increases from the dome of the arch to the wings and to the zone of water-oil contact. To zones of water-oil contact viscosity characteristics of reservoir oil increase due to gravitational redistribution of high-molecular components of oil and dispersing them into the transition zone at the boundary of water-oil contact.
Each Deposit has its own set of causes of changes in the properties of oil in the reservoir and at the stage of research development processes they must be studied. The reasons for changes in the properties of oil on the area of the field are very diverse. Geological and structural features of the structure of the Deposit, the presence of formation exits to the surface, chemical, bacteriological, physico-chemical and other processes occurring in the reservoir, directly or indirectly affect the composition and properties of oils.
Knowing the initial distribution of oil properties on the reservoir and the dynamics of changes in the composition and properties of oil extracted from wells, it is possible, for example, to judge the directions of movement of oil in the reservoir, to establish the relationship of oil and injection wells of a multi-reservoir, to assess the productivity of individual.
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Some Results of Complex Nmr-researches of Hihg-viscous Oiles on the Oilfields of Tatarstan
Authors V. Murzakaev, A. Bragin, N. Belousova, V. Skirda, M. Doroginizkij, T. Abdullin and M. AmerchanovSummaryThere are presented results of complex high-resolution researches of wells by the nuclear magnetic resonance tool in strong field and researches of core, that was extracted from the same intervals. There are given some recommendations about application of mobile apparature NMR-Core for fullsize core researches directly on the borehole.
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Water Injection Design: Ink Carbonate Field Example
Authors S. Zimin, D. Burdakov, V. Sibilev, V. Gomulsky and O. TokarevaSummaryThis work reviews an example of water injection planning with respect to Irkutsk Oil Company carbonate reservoir. Pilot water injection, 4D electric survey, reservoir simulation are considered as a methods reducing geological uncertainties. Basic research compilation are basic to establish waterflooding target performance.
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New Productive Objects in the Vendian Sedimentary Complex of the Srednebotuobinsky Field (Siberian Platform)
Authors L.V. Torgashova, N.N. Chikina, V.A. Grinchenko, V.A. Galiaskarov and A.V. YukhnevichSummaryThe authors describe a case study of the Sredneobuobinskoye Field to justify the potential of unexplored oil and gas bearing complexes. Past years of geological exploration program at the Srednebotuobinskoye Field allowed to discover a number of previously unknown oil and gas bearing targets: the basal layer of the Uspunskaya Series, the Arylakhsky Horizon, the productive intervals of the Upper Buyckskaya sub-series. The geology of the identified targets is described. As the hydrocarbon reserves of the main productive layers deplete, they will be replenished from new promising targets.
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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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