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GeoBaikal 2018
- Conference date: August 11-17, 2018
- Location: Irkutsk, Russia
- Published: 11 August 2018
1 - 20 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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