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GeoBaikal 2018
- Conference date: August 11-17, 2018
- Location: Irkutsk, Russia
- Published: 11 August 2018
1 - 50 of 114 results
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Assessing Method for the Rocks Wettability by Comparing X-ray Tomograms of a Dry and Contrast Solution Saturate Salvage of Core
Authors S. Galkin, Yu. Kolychev and S. CherepanovSummaryThe possibility of direct evaluation of the rocks wettability by X-ray tomography method. The method is based on the comparison of the tomograms in the dry and saturated state, which allows you to visually assess the degree of impregnation of the core. As the saturating agent, an aqueous solution of NaI was used, the addition of which in water does not change the filtration properties of the fluid, increasing its X-ray density. For hydrophilic samples, complete impregnation of the samples is established, for hydrophobic samples there is no impregnation in the central part. As a result, the types of rocks are distinguished by the degree of wettability: hydrophilic, with average signs of hydrophobicity, with strong hydrophobicity characteristics, absolutely hydrophobic.
For the samples studied, the reliability of the wettability determinations by the Tulbovich method is established, which overestimates the hydrophobicity of the rocks. To monitor the results of tomography, a microscopic analysis of the sections was performed, showing an increased content of organic matter for hydrophobic samples.
In the studied core collection, the results of the wettability evaluation by tomography are in good agreement with the well electrometry data. Samples with an absolutely hydrophobic cut type are characterized by lateral logging resistances of more than 1000 Ohm · m. Samples with signs of hydrophobicity are encountered in intervals with resistances in the range from 120 to 800 Ohm · m. For hydrophilic samples, much lower resistances of less than 100 Ohm · m are characteristic. The relationship between wettability and the conductivity of rocks is of great practical importance, since, when confirmed on a larger volume, the core in the long term allows, by the method of lateral logging, to establish the zonality of the types of rock wetability.
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Well Placement in Carbonates. Success Brought by Multilayer Bed Boundary Detection Technology
Authors S. Lebedev, V. Sayfitdinova, S. Kochneva, V. Permyakov and V. BaryakhSummaryIn the Volga-Ural region, a significant part of the horizontal drilling is carried out on the carbonate formations. Wells with horizontal sections of 300–400 m are drilled on Bashkirian, Tournaisian and Famennian deposits. In addition to maintain the horizontal section within the reservoir, depending on the formation and the field, the task for vertical coverage of the formation is also set. The purpose of this approach is to maximize coverage of the tight and porous intervals vertically, as well as maximize the zone of reservoir drainage. To perform these tasks, understanding the structure boundaries at a distance from the well is critical and is ensured by Multilayer Bed Boundary Detection Technology.
Standard electromagnetic logging of propagation or induction resistivity in highly resistive interbedded formations such as carbonate deposits can to some extent distort the real resistivity values of reservoir, underestimating the values in tight intervals, which usually have very high resistivity.
Nevertheless, the Multilayer Bed Boundary Detection Technology has been successfully used during the well placement in the carbonate sediments of the Volga-Ural region, it allowed mapping the boundaries in conditions of high formation resistivity and low resistivity contrasts between the interbeds.
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Prospects of the Oil and Gas Content of the Vendian Bohan Horizon Within One of the Fields in the South of the Siberian Platform
Authors O.A. Kolycheva, I.A. Farishova and A.D. PletnevaSummaryFor a long time, the sediments of the Bohansk horizon in the south of the Siberian Platform were considered to be unprospective, but with the discovery of industrial deposits at the Chikanskoye gas-condensate field, which is a satellite of the Kovykta field, interest in them has increased. The autor has analyzed the main structural features of prospective terrigenous deposits of the Bohan horizon in the Kovykta field, presents a comprehensive analysis of seismic materials (inversion transformations, dynamic and paleomorphological), which resulted in the heterogeneity of the structure of the target horizon, and also mapped out a prospective area with signs of gas saturation
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Stratigraphic Pinch-out Zones in Riphean Deposits As Promising Exploration Targets for Expanding Gazprom’s Mineral Resources Base in the Central and Western Parts of the Siberian Platform
Authors O.A. Smirnov, A.V. Lukashov, A.S. Nedosedkin and S.A. MoiseevSummaryAt present, Riphean deposits represent one of thepromising exploration targets, which are expected toensure sizeable reserves additions to meet throughput capacitiesof the ESPO oil pipeline and the Power of Siberia gas pipeline. Using three regional seismic profiles Batolit,Kezhma - Patom trough, Svetlaya - Khoshonskaya wells, we examined the mode of occurrence of Riphean deposits inthe zones of their pinch-out. It was shown that, by analogy with the Yurubchenskoe and Kuyumbinskoe fields,the subcrop of the Riphean carbonate deposits beneath the erosional surface may have been favorable forthe deposition of good quality reservoir rocks. The intra-Riphean deposits were shown to have high oil andgas potential. At the present stage of investigation, the priority areas have been delineated for inclusion inGazprom’s exploration and licensing program forthe near and medium term.
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Seismic Wave Tracking and Coherence Estimation Are Two Sides of the One Task
Authors D.Y. Stepanov and R.M. SadykovSummaryIn the seismic wave fields terminology there are two fundamental concepts: wave regularity and spatial coherence. Although these concepts are contiguous, the term regularity is encountered in solving many problems, including the problem of detection (correlation, picking) of seismic waves. Coherence is encountered only in the task of identifying zones of tectonic deformations and fracture zones. Literary sources known to the author consider these problems separately, and the existing algorithms solve them independently.
The report shows that these problems can be solved within the single approach, using the seismic wave field statistical model and analysis of the directional summing results. This approach is an attempt to maximally formalize and automate the problems solution. As a result, the process of coherence cubes calculating does not require the involvement of piking results and can be carried out over the entire volume of initial data. The report presents the results of using the developed algorithms in the interpretation of VSP, 2D and 3D CDP of a number of oil and gas fields in Western Siberia region.
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Restoration and Study of Features of Geological Structure by Modern Methods of Integrated Seismic Processing and Interpretation, on the Example of the Nep Arch, the Nep-botuoba Antecline
Authors V. Shegay, A. Belemets, A. Rozhkova and F. ZeleznyakSummaryThe results of the research allowed to significantly clarify the seismogeological model of the area in comparison with the data of previous years. In the framework of modern works it was possible to obtain a seismic image of the geological environment with the restored position reflecting the boundaries of the studied section due to in-depth study of the features of the geological structure of the area and more correct input of static corrections. Subsequently, the correctness of the specified structural plans was confirmed by drilling. This allows us to clarify the structural and tectonic model of the site and for the first time to make an assumption about the presence of tectonic shift within the work area. It can confined to the junction zone of the NEP-botuoba antecline and Predpatomsky regional trough. The sedimentation model of the target reservoirs was developed for the first time on the basis of the latest data, which allowed to clarify the areas of reservoir development. In comparison with the data of 2012, the latest results made it possible to clarify the hydrocarbon potential of the studied area and reduce the risks during further exploration.
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Integrated Geophysical Investigations at the Khaya Khudag Ritual Complex in Eastern Part of Mongolia
Authors T. Khuut, O. Tserendorj, B. Dashdondog, B. Khuut and B. KhuutSummaryMongolian territory is rich in history and man-made heritage. Hundreds of monuments to testify were left in the vast expanse from the Altai Mountains to steppe eastern Mongolia. In nowadays, non-destructive integrated geophysical prospecting methods have been increasingly used for the investigation of archaeological sites in Mongolian territory. This paper describes the results of integrated geophysical investigation based ground penetrating radar and magnetic surveys in the ritual complex of Khaya Khudag area in Khentii province. The correlation of these non-invasive methods acquires high resolution images of the subsurface to decrease the destruction, time and cost of archaeological excavations. The aim of this work was the recognition, location and mapping of buried ritual complex structures by integrated geophysical survey. The geophysical survey includes the utilization of magnetic and GPR. These techniques are described as fast data acquisition rate, high resolution, non-destructive and cost-effective methods. The present survey was performed through these steps, first a magnetic prospecting was carried out followed by GPR survey. When the GPR profiles were compared with the magnetic data along the same paths there were good coincidence between the positives and negatives in both cases.
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Geostatistic Recognition of Genetically Distinct Shale Facies in the Ordos Basin, North China
By S. LinSummaryIn the Chang 7 section of upper Triassic in the Ordos Basin, hierarchical cluster analysis of the 17 selected parameters identifies 3 genetically distinct shale facies. The results of this study demonstrate the power of combined sedimentology, Geochemistry, Mineralogy and Organic Petrology analysis to improve understanding of variations in shales within a single source rock. Hierarchical cluster analysis allowed the definitive classification of 113 shale samples from the study area. The resulting facies were used as a training set to construct a geostatistic decision tree that can be used to assign (1) genetic affinities and (2) a level of confidence in the classification for any additional shale samples that become available.
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The Application of the “Double Kriging” Method in the Construction of Volumetric Petrophysical Models
Authors V. Shestakov, M.M. Amani, D. Stepanov and G. SysolyatinaSummaryThe constructing of volumetric petrophysical models is in demand for the deposits exploitation and wells drilling tasks. This is due to the fact that petrophysical parameters, such as porosity or permeability, storing important information about porous reservoirs presence or absence, the migration of fluids in the geological environment, and so on. Initially, petrophysical parameters are measured using well logging and core analyses methods, which is why they are known only in borehole or around them. The interpolation of such a limited data set within a three-dimensional region can be carried out using various stochastic and interpolation methods: deterministic interpolators (linear, spline, Newton’s formulas, etc.), sequential Gauss simulation, direct conversion of seismic attributes into GWL parameters, geostatistics, neural networks etc. Recently, the last two methods have being developed most intense, since they are based on the joint use of seismic and GWL data and allow obtaining statistically optimal results. In this article, a new petrophysical parameter predicting method that using two statistical models is presented. The advantages and disadvantages of this method are discussed. Approbation results relying on real materials from the fields of Western Siberia are presented and discussed.
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Reservoir Simulation for the Stable Injection of CO2 Into Saline Aquifer
More LessSummaryRecently, studies on greenhouse gases capture and storage have been actively carried out and CO2 storage project is going on in South Korea. The purpose of this study is to analyze the pressure changes caused by CO2 injection in order to prevent the fault reactivation caused by excessive injection during the storage of CO2 in a saline aquifer and to analyze the co2 migration distance. To ensure the safety, it is essential to analyze the CO2 leakage through the fault. Therefore, the possibility of leakage was assessed based on the maximum allowable pressure of cap rock and the fault reopening pressure. With the analysis of the pressure increase and CO2 migration distance, the proper daily injection rate and maximum storage volume to minimize the possibility of leakage.
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The Innovation Technology Based on an Integral Spectral-velocity Forecast of Reservoir Properties Types of Geological Section and Filtration-capacitive Properties of Reservoirs in Borehole Area
Authors E. Kopilevich, N. Surova, L. Levchuk and G. KuznetsovSummaryThe report focuses on the innovation technology based on an integral spectral-velocity forecast (ISVF) of reservoir properties types of geological section and filtration-capacitive properties of reservoirs in borehole area. The physical basis of technology, it’s description and flowchart are also introduced there. The application of ISVF technology provides an opportunity to complete the forecast of types of geological section and filtrationcapacitive properties of reservoirs (such as rate of porosity, permeability, effective thickness, specific capacity and hydroconductivity) in the form of prediction maps and 3D cubes. Nowadays, the technology has been tested and used in various geological conditions during carrying out regional and prospecting and exploration seismic works.
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Geology and Tectonics of the Olkhon Geodynamic Site (Western Baikal Region)
Authors D.P. Gladkochub, V.S. Fedorovsky and Z.L. MotovaSummaryThis post-conference trip takes the participants to Minor Sea of Lake Baikal, central western Baikal area to give them an idea of local geology and history of Lake Baikal, to show well-shaped folds, faults, and traces of glacial and karst activity.
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Justification of 3d-seismic Data Azimuthal Attribute Analysis Application in Geomechanical Modeling
Authors R.N. Sitdikov and A.V. StepanovSummaryPetroleum geomechanical modeling is a process of determining mechanical properties of a rock and its reactions to impacts during development of an oil field. When constructing a geomechanical model of an object, the initial stage is building of a structural model of the geological environment. One of the main elements of this model is a skeleton of fault tectonics. Ordered fracturing as an element of the skeleton is manifested itself by the anisotropic properties of seismic wave fields. In this article, we will consider the possibilities of studying the anisotropy of the geological environment in connection with the construction of a geomechanical model based on using amplitude information of reflected waves. The feasibility study of using azimuth attributive analysis of seismic data at selected research facilities located in the southeast of Tatarstan will be performed. In these studies, as a tool, we used a full wave modeling Tesseral software.
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Cost-effective Time Lapse Seismic Based on Direct Transmitted P-waves for Monitoring Sagd Heavy Oil Production
Authors M. Gareev, M. Amerkhanov, M. Lyabipov, A. Stepanov, R. Sitdikov and A. LomonosovSummaryThe purpose of seismic experiments was to develop a cost-effective seismic monitoring technology for a shallow heavy oil reservoir driven by SAGD. A permanent buried seismic monitoring system was deployed at one of oil sand bitumen reservoir within Cheremshan-Barstrick group of heavy oil fields, Tatarstan (Russia). It consisted of a network of measuring wells. A heat-resistant geophone was placed in each well at a depth of several meters below the base of oil sands reservoir. Field experiment included base and two monitor surveys performed during the year. To control seasonal variations of near surface elastic properties of formation a surface low channel geophone array centered relative to the wellhead of the measuring well was used upon survey. A quantitative interpretation based on time lapse direct transmitted P-wave inversion was used to determine temperature changes in reservoir conditions caused by steam injection and production. To validate seismic results, maps of ray velocity difference between base and first monitoring as well as first and second monitoring surveys were compared with temperature logs of wells-producers. They showed good correlation and had no contradictions. We concluded that the developed seismic acquisition and the workflow have sufficient sensitivity for mapping changes in reservoir conditions.
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Learning From Ten Years of Applying Framework Project Management for Safety in BP Geophysical Data Acquisition Projects
Authors J. Naranjo, G. Schurter and N. CaveSummaryFollowing a fatal injury of one crew member on a land seismic acquisition crew in North Africa in 2007, BP implemented a Global Framework Project Management tool for operated surveys. Today, we can evaluate the effectiveness of the implementation of BP’s Management of Geophysical Operations (MoGO) following ten years of operations under the framework.
Seismic acquisition surveys are inherently dangerous. Often, crews are comprised of large numbers of people (10s to 100s), that are required to work for months, even years, in harsh environments. Given these conditions, this activity is typically nominated “high risk” to the oil and gas operating companies. The MoGO framework has helped BP to approach each project and contractor in a disciplined, structured manner to safely plan and execute geophysical data acquisition projects. This approach has helped BP to be consistent internally and externally, for all surveys and contractors. In this paper, we provide commentary on the project phases and examples that have been shaped by environmental and safety decisions in specific phases throughout the MoGO. In some cases, projects were modified, improved or abandoned based on varying criteria where the framework process aided BP to improve safe operations in geophysical data acquisition.
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Exploration Works Planning Using Value of Information Concept in Geological Uncertainties and Project Limitations
Authors P.Ya. Mostovoy, R.A. Oshamrin, V.S. Rukavishnikov and A.M. VashevnikSummaryThe S field development plan is focused on the Jeribe/Upper Dhiban reservoir interval. There is significant uncertainty in estimate of stock-tank oil initially in place (STOIIP) and recoverable resources due to the absence of a defined oil-water contact (OWC) in the wells drilled to date H-1 and S-1.
The field is considered to be developed by six wells. However because of uncertainty in reserves field development balances the need for immediate production with the need to assess the most likely reserve size as quickly as possible in order to optimize the full field facilities.
The approach to optimal drilling sequence finding in geological uncertainties and limiting conditions is offered in the research - evidence from S oil field. The suggested approach is used to recommend optimal drilling sequence of planed wells to reduce economic risks and obtain the highest NPV of S development project. The optimal drilling sequence was found using value of information approach leading to the highest project expected monetary value from more than 120 possible drilling sequences.
The dynamic development strategy that reduces uncertainties and economic risks by VOI approach - drilling risky well in the first two years of production and depending on the outcome realize facility optimization and further drilling was recommended.
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Initial Data Preparation for Naturally Fractured-cavernous Carbonate Reservoirs of Osinskiy Horizon Geological Modelling
Authors O.A. Timakov and E.A. RomashevSummaryA significant part of hydrocarbon resources of Leno-Tungussian oil-and-gas province is confined with carbonate deposits of Osinskiy horizon (O–1 formation, Billirskaya suite), represented by ancient Paleozoic limestones and dolomites, most of which have mixed cavernous-porous and fractured-cavernous type. One of the main difficulties in developing geological models of such complex reservoirs is the selection of modelling algorithms that allow to reproduce the high heterogeneity of their filtration-capacitive properties associated with the impact of post-sedimentation processes and the non-linear geometry of the void space.
In this paper, we present the results of the collection, processing and analysis of primary geological and geophysical data that precedes the stage of full-scale geological and hydrodynamic modeling. The main features of the considered object, located in the central part of Nepskiy arch (Nepsko-Botuobinskiy region), are a large size of modeling area and a number of production wells, which makes it difficult to provide the required amount of special researches. An important factor is the significant loss of accuracy during geological model upscaling process and the necessity to maintain adequate duration of hydrodynamic calculations. Thus, a certain compromise is required between the detail level, the size of the model and time costs of its creation.
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Shallow Seismic Reflection Survey at Mogod Active Fault to Investigate Subsurface Structures
Authors N. Erdenetsogt and B. GanboldSummaryThis study tried to determine shallow structures of Mogod fault by using shallow seismic reflection survey , then compared its result with geological information.
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Geological and Geophysical Data Integration in the Geological Model of V13 Formation of Chona Field on the Assessment Stage of Project
Authors P.Ya. Mostovoy, R.R. Husnitdinov, V.S. Vorobev and P.P. EmelyanovSummaryThe aim of the investigation is geological and geophysical data integration in a seismic-geological model of a complex heterogeneous reservoir,V13 formation, which is considered as a base for exploration works planning and successful further field appraisal.
By means of using regional data, deep geological analysis, technological projects results, unconventional approaches to geophysical data processing and interpretation taking into account peculiarities of field geology and geological modelling using geostatistical inversion the review of geology aspects V13 formation reservoir on Chona field was made and planning exploration works were reconsidered.
Two pilots of appraisal well were drilled to verify a prediction according to the final seismic-geological model. The aims of pilots were two predicted zones with good and bad reservoir quality. According to conducted cameral works and drilling results analysis it may be concluded that high detailed seismic-geological model gives a qualitative base for decision making about explorations works in conditions of complex reservoir and major explorations projects that corresponds with high economics risks.
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Where Do We Stand With Wireless Acquisition Systems Capabilities?
Authors N. Tellier, S. Wilcox, V. Boreiko, A. Abashkin and V. ZaborodkoSummaryLand seismic recording equipment manufacturers consistently evolve their products striving to create the “perfect” registration system which is viewed as power-efficient, cost-effective and reliable solution, able to transmit in real-time mode both the seismic data and the information about its current operational status to ensure the comprehensive quality control. Unlike cabled, technical solutions used in the wireless registration systems today still remain the matter of compromise defined by the method of implementation of the available tecnologies. The presentation includes the comparison of the most important technologies used in different systems, and their impact on the systems' technical features.
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Enhanced Oil Recovery Technologies for the Arctic Region
Authors L.K. Altunina, V.A. Kuvshinov and I.V. KuvshinovSummaryIn the coming decades, the Arctic region of Russia will be the main reserve of the country's oil and gas production industry. For effective development of oil fields in the Arctic, it is necessary to create and scale up scientifically based oil production technologies adapted to the northern conditions. The paper presents new oil recovery technologies developed at the IPC SB RAS, which can be used in the Arctic fields. The technologies with the use of thermotropic inorganic gelforming compositions GALKA® and MEGA, oil-displacing compositions with controlled viscosity and alkalinity of NINKA® and GBK are promising. The compositions have low freezing point, are effective in a wide range of geological and physical conditions and stages of field development.
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Increasing the Efficiency of the Orenburg Oil and Gas Condensate Field Development Through the Introduction of an Intelligent Gas Injection Control System to Optimize the Gaslift Operation of Wells
Authors V.V. Ulyanov, E.A. Kibirev, M.T. Nukhaev, K.V. Rymarenko and V.S. BakSummaryGaslift is widely used in the world practice of oil production. At the moment, one of the realizations of this production method is used at the Orenburg oil and gas condensate field - a gas compressorless method of operating wells. The paper presents the experience of Gazpromneft-Orenburg on the introduction of an intelligent gas injection control system.
The advantage of the compressor-free gas-lift mode of operation is a significant reduction in operating costs. A feature of this method of operation is the need for continuous control of injection into each well. A system with automatic control valves was introduced to automate the injection of gas in the Orenburg oil and gas condensate field, which allowed point-setting of the injection, constantly monitoring and measuring the gas injection for each well.
The implementation of the concept of an smart field allowed Gazpromneft-Orenburg not only to optimize the operation of the gas lift wells, but also to optimize the work in the field as a whole, including:
- the release of the time for personnel to analyze and make decisions by reducing the routine operations;
- optimization of the operators’ work due to remote control of technological objects, wells;
- Reducing the risks of labor and personnel safety in conditions of high hydrogen sulphide content.
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Description of the Geological Structure and Hydrocarbon Potential of the License Area Rusanovsky the Waters of the Kara Sea by 3d Exploration Seismic Data
Authors V.N. Borodkin, A.R. Kurchikov, V.A. Lukashov, O.A. Smirnov and A.V. PogreckijSummaryThe article presents a brief tectonic timing of the research area, oil and gas characteristics with the release of oil and gas complexes (NGK). On the basis of 3D seismic exploration, seismogeological models are presented, perspective objects are identified, the optimal volume of geological exploration is planned.
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Consideration of Near Surface Anomalies at the Time of Depth Migration
Authors A. Burlakov, S. Ilyin, M. Gabova, I. Shamsutdinov, E. Kuchkanov and P. PopovaSummaryThis report will analyze methods of near surface anomalies’ consideration at the time of depth migration. One of the main troubles with obtaining true location of reflection horizons in depth domain is connected with velocity anomalies in the near surface. Therefore, in our report we will investigate near surface model building with support from seismic data engaging extensive wells’ information. Constructed near surface model will be included in generic depth velocity model.
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Complex Solutions in the Field of Industrial Safety in Geological Investigation Works
Authors P. Didenko and A. SukhodolovSummaryThe region of Eastern Siberia is a difficult area for geological investigation works not only from the point of view of Geology and Geophysics, but also from the point of view of industrial safety. This is harsh climatic conditions, often 100% autonomy, the length of the winter road more than 700 km, the lack of market contractors. In order to reduce injuries, “Gazpromneft-Angara” LLC began to deal with issues of industrial safety in 2012.A lot of results were achieved during the period of 2013–2018 which contributed to the formation of complex solutions in the field of industrial safety, namely: the organization of medical services, transport safety, supervision of industrial safety, requirements for residential wagon-house. It should be noted that “Gazpromneft-Angara” LLC impliment part of the issues on its own.
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Analyzing Modern Technologies for Acquiring, Processing and Interpreting Geophysical Data: The Case of the Arctic Shelf Projects
Authors G.A. Zavarzina, D.S. Shapabaeva, V.A. Kosmynin, R.R. Murzin and O.A. ZakharovaSummaryTurning the Arctic offshore projects into reality remains a distant possibility. However, a valid present-day concept is still needed to develop the oil and gas fields discovered so far and implement prospecting and exploration programmes. A particular emphasis is therefore placed on how we can introduce novel approaches to acquiring, processing and interpreting geophysical data to minimize the costs of exploration activity in the offshore Arctic regions.
This paper discusses both conventional G&G approaches and new technologies aimed at harnessing hydrocarbon resources of the Arctic shelf.
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Aero-tem Effective Magnetic Moment Estimation on the Example of Localization of a Kimberlite Object
Authors I. Ivanova, A. Belaya, A. Chernyshev and G.M. TrigubovighSummaryIn this work an estimation of the affection of current decay time duration on TEM curves by means of mathematical modelling is described. Horizontally layered medium with vertical cylindrical inhomogeneity is taken as a geoelectrical model.
Kimberlites in host rocks form zones of increased conductivity, which represent a criterion of identification of search objects and determine advantage of using the methods of electromagnetic prospecting. In particular, TEM is used for solving search and parameterization tasks for kimberlite objects. However, the effectiveness of TEM application directly depends on the selection of a correct measurement technique, including current decay time duration in the source.
The question arises as to how current decay time duration in a source affects the amplitude of the anomaly caused by the local conductive subvertical object and what time ranges of turn-off current decay time duration are acceptable. This article is devoted to the study of this problem by means of mathematical modelling
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Features of Organogenic Buildups in Osinsky Horizon Facial Zones (Siberian Platform)
Authors E.N. Maksimova and K.N. ChertinaSummaryA comparative analysis of the Cambrian organogenic microbial buildups in various facial zones in the territory of the Nepa-Botuoba anteclise (Eastern Siberia) was completed.
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Structure of the Earth’s Crust and Upper Mantle of the North Muysk Segment of the Baikal Rift Zone According to Seismic-gravity Data
Authors V.V Mordvinova, M.A. Khritova, E.Kh. Turutanov, E.A. Kobeleva and M.M. KobelevSummaryThe performed interpretation of seismic-gravimetric data in the North-Muysky area of the Baikal rift zone makes it possible to estimate the thickness, extent and direction of sinking of the sole of large geological bodies of acidic composition and to isolate in the earth’s crust large-amplitude thrusts with a length of hundreds of kilometers.
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Gazprom Neft Company Experience in Specific Probabilistic Approach for Resource Potential Estimation in Different Exploration Maturity Shelf Project
More LessSummaryGazprom neft company has developed the program of resource base enhancement untill 2025 including Russian shelf licenses. Consequently a resource potential estimation for frontier and emerging areas is important task for exploration process.
In this report Gazprom neft probabilistic approach for shelf projects resource estimation is analyzed and exploration maturity influence on assessment is shown.
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A Critical Analysis of the Experience of Using Intelligent Inflow Indicators for the Continuous Monitoring of Horizontal Wells at the Fields in Russia: Including Prirazlomnoye and Yu. Korchagin
Authors I.R. Mukhametshin, M.T. Nukhaev, A.R. Galimzyanov, A.V. Koloda, O.I. Abramenko and A.A. SenkovSummaryOffshore field development is a complex task, an effective solution of which is impossible without conducting a wide range of research. While developing deposits with long horizontal wells, one of the important tasks is to continuously monitor each of the wellbore intervals to select optimal operating conditions and prevent early breakthroughs of water and gas. The paper presents a critical analysis of the experience of using intelligent inflow indicators for the continuous monitoring of horizontal wells in the fields in Russia. This experience allowed not only to solve local operational problems, but also to update the hydrodynamic models. Knowing the intervals of the maximum and minimum inflow, one can determine the zonal productivity and link it with the geology of the reservoir. The following process is used: the permeability of the various intervals is restored, taking into account the well operating conditions and formation pressure . Then, the integral permeability obtained by well test is compared with results from tracers studies. The last stage is the linkage of the obtained per interval permeability with the petrophysical and facies model. This approach is necessary to obtain a single picture of the geological structure of the reservoir, accurate prediction of the operation of the exploited wells.
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The Selection of the Optimal Development System for Heterogeneous Reservoirs With Hard-to-develop Deposits
Authors M.V. Naugolnov, V.Yu. Klimov, S.Sh. Iskhakova and A.A. SednevSummaryThis work is devoted to the aspects of the selection of optimal development systems for the conditions of highly heterogeneous reservoirs with hard-to-recover reserves using the example of the Achimov deposits of Western Siberia. The choice is based on the use of multivariate 3D hydrodynamic modeling on the basis of various implementations of the conceptual geological 3D model. Different well spacing, methods of well completion and operating modes are considered; the development systems that are best for different facies zones of deep-sea sediments are justified
With the use of multivariate modeling, functions linking the type of completion of the well and the need to organize a reservoir pressure maintenance system with permeability and lateral heterogeneity of the formation are obtained. Sensitivity analysis demonstrated the stability of design solutions to variable geological factors and allowed to assess the value of their influence on technological and economic performance indicators. The proposed methodical approach is relevant not only for the Achimov deposits of Western Siberia, but also for any deposits with hard-to-recover reserves, with high degree of variability or poor knowledge.
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Guidelines for Low-altitude Aeromagnetic Surveys (Russian Federal Agency for Subsoil Use, 2018) - the Main Points and the Authors' Comments
Authors A.V. Parshin, V.S. Tsirel and A.K. RzhevskayaSummaryAt present, in the Russian Federation, the normative base for performing magnetic prospecting is the «USSR Magnetic Survey Instruction Manual, 1981». This document played and plays the major role in methodical maintenance and unification of results of magnetic surveys. However, with the technological progress, there are innovations that significantly change the practice of magnetic prospecting. One such innovation is the robotic magnetometric systems based on light highly maneuverable unmanned aerial vehicles (UAVs), which significantly increased the efficiency of magnetic surveys, especially in complex landscape-morphological conditions. The methodic of such variant of the magnetic prospecting can differ substantially from the traditional methodic of ground and aeromagnetic surveys. It is not regulated by the USSR Instruction, 1981, which makes it difficult to use unmanned geological exploration methods in Russia, and determined the need to develop an appropriate normative document. In this regard, in 2018, the Federal Agency for Subsoil Use prepared and approved the “Guidelines for low-altitude aeromagnetic surveys,” which supplement the classical “Instruction .., 1981” and establish the basic requirements for the produce and quality control of magnetic surveys with UAVs. «Guidelines» summarize the current level of practice and the latest achievements of research in the field of unmanned aerogeophysics and technologies providing it. In this paper, the authors of the «Guidelines» discuss its main theses.
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New Role of Thermal Petrophusical Tehcnologies at Exploration, Prospecting and Development of Oil-gas Fields
Authors Yu. Popov, E. Popov, E. Chekhonin, A. Gabova, E. Savelev and A. GoncharovSummaryNew thermal petrophysical technologies, developed in 2014–2018, have been promptly implemented for solution of different problems in exploration, prospecting and development of hydrocarbon fields. During last few years vast measurements of rock thermal properties - thermal conductivity, thermal diffusivity, volumetric heat capacity, thermal anisotropy coefficient, coefficient of linear thermal expansion - have been performed with the new technologies on more than 30 000 core samples from 31 wells drilled in 26 oil-gas fields of heavy oil and unconventional reservoirs. Integration of the new thermophysical technologies with well logging methods and new established correlations of the thermal properties with other rock properties allowed us to improve essentially effectiveness of methods of thermal petrophysics and to extend areas of their applications in oil-gas industry. The developed technology of non- contact non-destructive continuous thermal core logging provides high-resolution recording variations of rock thermal properties with a spatial resolution of ~1 mm and is combined with following measurements of the thermal properties at formation temperatures up to 300 C. The new thermophysical technologies become particularly actual in conditions when significant multi-scale heterogeneity and anisotropy of rocks within many hydrocarbon fields reduce effectiveness of standard petrophysical logging methods due to their restricted spatial resolution.
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Importance of Conceptual Geological Model in Probabilistic Field Assessment
By O.A. PopovaSummaryAppearance of probabilistic geological models has created an impression that one of the oldest and the most common problems of deterministic modelling - failure of initial assessments - is solved. Indeed, probabilistic model considers a large set of possible realizations of the deposit geology, and, in the perfect world, the range of uncertainty should be narrowed with obtaining new data. However, a new well often brings surprises: either it widens the uncertainty interval, or moves it beyond the initial distribution. Repetition of such cases leads to disappointment in probabilistic models. Should not we stop using them? Analysis of successful and unsuccessful probabilistic case studies shows that one of the reasons that can critically affect the results of assessment and the project as a whole is the choice of conceptual geological model for the object. The paper considers the existing views on the idea of conceptual model and suggests an updated interpretation of it. In the context of probabilistic modelling, the creation of a conceptual framework is an integral part of uncertainty analysis and decision making. And the correct consideration of all possible geological concepts makes it possible to reduce the number of “black swans”.
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Distortion of the Reflected Wave Hodograph Using the Floating Reduction Level on the Example of the Eastern Siberia Region
By A.A. PyankovSummaryIn the last period there seems to be considerable interest in the production of 3D surveys in areas of Eastern Siberia. In the process of designing the field work, as a rule, the study of the upper part of the cut is not given due attention. When processing seismic data in areas with highly variable terrain of the observation surface is used not flat, but “floating” level of reduction. The effect of non-horizontal boundaries based on the OGT seismogram leads to overestimated velocity estimates. For the correct analysis of summation rates, it is proposed to calculate and use the local statics for the floating level of processing on each base of the OGT
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Southern Baikal Region as a Model Site for Studying Late Proterozoic Deposition and Oil Generation History
SummaryГеологический семинар будет интересен для специали-стов нефтегазового сектора. Часть маршрута будет про-?ходить на корабле по Байкалу от пос. Листвянка до пос.Большое Голоустное. В этом интервале протяжённостью?60 км по берегам обнажаются породы, которые отража-ют значительную часть земной истории. Вдоль Листвянки?и за ней вскрываются гранитоидные толщи, возраст фраг-ментов которых датируется от 2,8 до 3,4 млрд. лет. Они?прорываются дайками базитов мезо, неопротерозойскогои палеозойского возрастов. За посёлком Большие К оты эти?породы сменяются конгломератовой толщей юры с про-пластками углей, которые прослеживаются на север в Че-?ремховский угольный бассейн и имеют ориентировочныйвозраст 170 млн. лет. Далее к северо-востоку при прибли-?жении к посёлку Большое Голоустное, в пади Кадильнаяогромными столбами встают известняки с определённым?возрастом 580 млн. лет. Самым замечательным в них яв-ляются прекрасно отпрепарированные строматолитовые?постройки – свидетель цианобактериальной (и водоросле-?вой?) жизни в то время. И при приближении к посёлку поберегу озера вскрываются разрез голоустенской свиты не-?опротерозоя и галечно-песчаные отложения морского днаБайкала, образованные в последний миллион лет. По пути?от Большое Голоустное к Иркутску, вдоль рек Голоустнаяи Правая Ушаковка в придорожных обнажениях наблюда-?ются фрагменты разреза неопротерозойских толщ, частькоторых является нефтематеринскими. Судя по данным?бурения, к северу они фациально меняются и выклинива-ются. При приближении к Иркутску разрез наращивается?поздневендскими и нижнекембрийскими отложениями,которые перекрываются песчаниками юры.
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The Sedimentary Structure of the Siberian Platform Cambrian Marginal Basins and the Methodological Causes of Some Tectonic Errors
By S. SukhovSummaryThe integrated multiyear study results of Cambrian sedimentary architectures are presented. They are based on outcrops, well records and seismic-reflection data as well as sedimentation modeling. The analysis allow to reconstruct reef-rimmed carbonate platforms attended by open edge craton basins and explain dipping as progradational stacking pattern with clinoforms, the infilling of the accommodation in contrast to popular tectonic interpretation.
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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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