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GeoBaikal 2018
- Conference date: August 11-17, 2018
- Location: Irkutsk, Russia
- Published: 11 August 2018
61 - 80 of 114 results
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Problems of Interpretation Archive Seismic Data in East Siberian
Authors I. Shipilov, D. Tverdohlebov, A. Gaiduk and N. PopovaSummaryThe territory of East Siberian have been exploring since 60s years of last century till now days. A lack of productive capacity of computing techniques and imperfection of methods of seismic prospecting in last century didn't allow to set off fully the effect of complicating geological factors. This was the reason for the low quality of the stacks data. Follow-up active technological evolving caused to appearing qualitatively new type of seismic results, and, therefore, to the common heterogeneity of archive data, dependent of survey's year, so that must be considered during interpretation them
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The Results of the Gravity Survey in the Nalaykh Basin (Mongolia)
Authors B. Buyantogtokh, E.Kh. Turutanov and B. TengisSummaryAs a result of gravimetric studies, characteristics of the mesozoic structures and data on the morphological features of the submerged part of the crystalline fundament were obtained. According to the interpretation of gravity profile, Nalaikh basin has a complex block structure and it is divided into two main parts. The thickness of the Mesozoic deposits in the center of the basin is about 600 m.
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Tectonophysical Approach to the Analysis of Geological and Geophysical Data at the Kovykta Gas-condensate Field
SummaryIn the report the results of application of modern ways in the tectonophysical analysis of geological and geophysical data for identification of regularities in a fault structure of a platform cover on the Kovykta gascondensate field (GCF) are considered. The basis for research of sedimentary cover are the materials of 3D seismic and electromagnetic survey, the structural data and materials of digital relief model processing. As a result of the complex analysis the zone-block structure (ZBS) of the Kovykta GCF is established. It represents hierarchy of blocks which contact with each other on wide zones of short fractures concentration. The ZBS style is defined by domination of subhorizontal fault zones (layer-by-layer stripping) and subvertical zones of northwest and northeast orientations. The network of the fault zones was formed in four stress fields which correspond with the main stages of an adjacent Baykal- Stanovoy mobile belt development in the Paleozoic- Cenozoic. Some fields are reactivated in the Cenozoic under the influence of the gravitational processes connected with local lifted raisings of a relief. The zone-block structure of the Kovykta GCF is a basis for it's zonation on hydrocarbon productivity, overpressure zones, on degree of fracturing and types of stress state of rocks. The solution of this task will allow to receive additional substantiating for the choice of drilling site which can be passed without geohazards and with the prospect of detection of natural gas accumulation.
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Mapping of Complex Fractured-cavernous Overpressure Zones in the Sedimentary Cover of the Northeastern Part of the Angara-lena Step by Geophysical Data
Authors A.S. Smirnov, A.G. Vakhromeev, I.A. Shelokhov, V.V. Kasyanov, N.N. Yaitskiy and A.V. MakarovaSummaryWhen interpreting the 2D and 3D seismic data processed with standard graph, it is impossible to detect oil and gas reservoirs (fissured-cavernous and porous-fissured types) with high properties. The reason for this - the small size of caverns and fractures, saturated with fluids with abnormally high reservoir pressures (AHRP). In particular, in the south of the Siberian craton (the Angara-Lena step) by drilling at depths of 1.2-2.2 km in the geological section of the halogen-carbonate rocks, the presence of gas- and brine-saturated reservoirs of fractured and fissured-cavernous type was established. The reservoir fluid pressures are 2.3-2.6 times higher than hydrostatic pressures. Nowadays, due to increased interest of oil and gas companies and institutions to the study of fractured reservoirs in dense rocks of the sedimentary cover and crystalline rocks of the basement, methods for modeling the propagation of seismic (scattered) waves are actively developing. The paper is devoted to the special approaches in the processing technology - the interpretation of seismic data, which are aimed at an accentuated study of a natural fissure reservoir through a “cloud” of scattered waves, which gives a field independent of fluid saturation, a dataset that is somehow related to a fracture and cavernous - with a pore space. The fractured filtration system of the intersalt reservoir, having the same properties in the acoustic field as the above / lower-lying carbonate layers, in addition or in contrast to them, is additionally characterized by the parameters of anisotropy, inhomogeneity or mosaic laterally.
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Experience of Ground Penetrating Radar Application for Gold Exploration in the Eastern Sayan Geological Settings
Authors A.A. Otsimik, V.V. Leskov, V.V. Gomulsky and S.A. BezdenejnikhSummaryThe paper describes the geological aspects of one of the gold deposits of the Eastern Sayan, related to its structure and genesis. The technique and hardware used in geophysical studies are described. The results of Ground penetrating radar (GPR) studies and features of the field data interpretation are presented. The comparison of the GPR data with vintage transient electromagnetic data is shown. The criterias for gold ore mineralization zones and ore bodies identifying based on the results of geological and geophysical studies are described.
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An Aspects of Transient Electromagnetic Method in the Near Field Zone Resolution for Oil and Gas Exploration in the South of the Siberian Craton
Authors I.K. Seminskiy, I.V. Buddo and E.V. MurzinaSummaryOne of the most common electroprospecting techniques for the oil and gas exploration is the transient electromagnetic method in the near field zone (TEM).
The resolution of TEM (possibility of horizontally-lying layers separation) depends on rocks geoelectrical properties. The current exploration strategy of Russian Federation is oil fields exploration of groups 2 and 3 by geological structure. Hence the resolution assessment of the TEM for oil and gas exploration in the geological settings of the south of the Siberian craton is evident. It is possible to evaluate the resolution of the TEM using synthetic modeling. In this research, the capabilities of the TEM in respect of the oil and gas exploration in the geological settings of the Nepa and Kamov Archs, as well as the Angara-Lena step were examined.
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Geoelectric Model of the Section As an Integral Part of the Oil and Gas Fields Geological Model (Case Study From the Kovykta Gas Condensate Field)
Authors I.V. Buddo, A.V. Pospeev, I.A. Shelohov, N.V. Misiurkeeva, Y.A. Agafonov and A.S. SmirnovSummaryThe stages of geological exploration correspond to specific geological tasks, for which sequential complication is typical. At each stage of geological exploration, an appropriate set of research methods is used, optimal for solving the problems of necessary detail. Like complicating the set of methods, at each stage of geological exploration a geoelectric model is used - the result of electromagnetic exploration - with appropriate level of detail. In the paper, an example of the Kovykta gas condensate field is shown which represents the consistently increase the detail of geoelectrical models. Each level of detail corresponds to the class of geological tasks to be solved, starting from promising gas-saturated reservoirs mapping, ending with the fracture zones and possible geohazards while drilling prediction.
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Fractured Fluid-bearing Reservoirs in Magmatic Rocks Prediction According to Transient Electromagnetic Soundings Data
Authors A.I. Ilyin, D.V. Kolesnikov, I.V. Buddo, A.G. Vakhromeyev, I.A. Shelohov, Y.A. Agafonov and R.B. SultanovSummaryNowadays active cluster drilling of deep production wells is carried out at the oil and gas fields of Nepsko- Botuobinskaya anteclise. During the drilling, fluid-loss zones are fixed. Numerous geohazards are associated with the magmatic rocks intrusions. The volume of drilling mud lost reaches thousands of cubic meters. The mapping of fluid-saturated zones in magmatic rocks can be performed with transient electromagnetic soundings in the near field zone (TEM). According to the geological basis the magmatic rocks intrusion into the carbonate rocks should be accompanied by saline water saturation of fractures in the traps and host rocks which leads to abnormally low electrical resistivity. TEM survey allows delineating zones of fluid-saturated fracturing and, when comparing the drilling data and the resistivity of rocks, predict possible risks of drilling wells, eventually correcting the position of well clusters.
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Feasibility of Fault Zones Fluid Permeability Assessment From the Set of Geophysical Data
Authors N.V. Misyurkeeva, I.V. Buddo, I.A. Shelohov, A.G. Vakhromeev, Y.A. Agafonov, I.V. Gorlov and A.S. SmirnovSummaryThe paper shows approaches to investigating and mapping of the faults in the sedimentary cover, as well as evaluating their fluid permeability based on high-density geophysical surveys data: 3D seismic and 3D TEM survey. Due to the high spatial density and high vertical resolution, these techniques allow the faults mapping as well as fluid-permeability and colmatage evaluation.
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Estimation of the Oil Pipeline Interference for the Transient Electromagnetic Data Interpretation (Oil Field Production Stage)
Authors E.V. Murzina, V.S. Emelyanov, V.V. Gomulskii, A V. Pospeev and Y.A. AgafonovSummaryTransient electromagnetic method in the near field zone carried out within the dense observation grid is often used at the stage of field development, to determine the geoelectrical properties of the target horizons for further prediction of the reservoirs saturation. However, when electromagnetic soundings are carried out within the producing oil field, the interference of TEM data is unavoidable. Hence it is necessary to develop special approaches to interpretation of TEM data affected by pipelines. The paper presents the results of TEM data interpretation from a few oil field of Eastern Siberia.
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Magnetotelluric Data Interpretation for Highly Resistive Shallow Environment
Authors A.V. Pospeev and E. SenSummaryThe paper considered an approach to the magnetotelluric (MT) data interpretation regarding to the near-surface heterogeneity influence attenuation. The analysis of spatial conductivity distribution within the central part of Nepa-Botuobinskaya anticlise studied with transient electromagnetic method (TEM) in the near field zone was carried out. The geoelectric model was built based on typical quasi-longitudinal MT curve inversion of the south of Siberian craton. The model was adjusted by placing heterogeneities into the upper part of the section. Polarization curves for electric and magnetic fields had been calculated for this model with respect to the galvanic shift. Acquired data had been spatially filtered. According to the conducted research results the approach to the near-surface heterogeneity influence attenuation for MT data interpretation was proposed.
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Transient Electromagnetic Method Efficiency Assessment for Oil and Gas Exploration (Based on the Forward Modeling Results)
Authors Z.Y. Shobohonova, O.V. Tokareva, S.V. Kompaniyets, I.V. Buddo and V.V. GomulskiySummaryThe success of the geophysical methods application for oil and gas exploration depends on the reservoir physical properties contrast. To choose the applicable geophysical methods, geological and geophysical modeling is performed. The paper shows the methods and results of TEM data forward modeling for various HC-prospective reservoirs of Western Siberia.
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Reducing Uncertainties in the Elastic-velocity Model of the Upper Part of the Section Construction by Tem Data Applying
Authors I.A. Shelokhov, I.V. Buddo and A.S. SmirnovSummaryAreas of permafrost rocks distribution occupy about 5 million sq. km of Russia territory. When processing seismic data in areas with permafrost rocks, its influence should be taken into account. Ignoring the complicated structure of permafrost zone can lead to significant errors in prospective horizons structure. Static corrections calculation by conventional methods (by smoothing the variations of the travel time) sometimes can result in artificial synclines arise on the section. The authors propose an approach to the elastic properties of the upper part of the section recovering from Shallow TEM data.
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Transient Electromagnetic Data Forward Modeling Reservoir Saturation Assessment
Authors Z.Y. Shobohonova, O.V. Tokareva, V.V. Gomulskiy and I.V. BuddoSummaryThe transient electromagnetic method in the near field zone (TEM) is widely used for oil and gas exploration in the Eastern and Western Siberia geological patterns. To assess the possible effectiveness of TEM in certain geological settings, a special technique of forward TEM modeling has been developed. The paper shows innovative approaches to the TEM forward modeling. It is shown that the synthetic simulation of the TEM signals makes it possible to evaluate the possibility of separating promising zones with different reservoir saturation.
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Conditions for the Formation of Neoproterozoic Sedimentary Rocks of the Oselok Group in the Sayan Region
Authors Z.L. Motova, T.V. Donskaya and D.P. GladkochubSummaryWe present the results of integrated studies of clastic sedimentary rocks Oselok group in the Sayan region. On the basis of petrographic, geochemical and U-Pb (LA-ICP-MS) geochronological studies it was found that the upper and lower parts of the cut of the Oselok group reveal certain differences. On the basis of identified features, it is anticipated that during the accumulation of terrigenous rocks Oselok group a change of the geodynamic regime of the basin sedimentation.
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The Influence of Planetary Geodynamics on the Success of Geological and Technical Measures for the Development of Oil and Gas Fields
Authors D.V. Tomashev, M.V. Nelepov and A.A. PapotnayaSummaryThe analysis allows to draw a conclusion about the effect of planetary tectonic processes on local areas within oil and gas fields, as a result of which zones of increased fracturing are formed both in carbonate and terrigenous reservoirs.-Planetary forces, acting on tectonic elements of the first order, cause deformations in smaller elements up to the formation of a network of cracks and microcracks within the productive deposits.
The resulting network of cracks has a direction consistent with the planetary stresses and is identified as linear zones in the wells with the largest oil or gas production.
The obtained information should be taken into account when planning geological and technical measures: drilling, hydraulic fracturing, design of injection wells, etc.
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Forecast of the Current Phase State of the Hydrocarbon Accumulations of Ciscaucasia on the Basis of an Analysis of the Geodynamic Activity of the Scythian Plate
Authors D.V. Tomashev, M.V. Nelepov and A.A. PapotnayaSummaryThe genetic sequence of hydrocarbon accumulation locations inherent in primary hydrocarbon systems is often violated in nature. To forecast the current phase state of hydrocarbon raw materials during geological exploration and preparation of primary design documentation, including the development of deposits, it is necessary to consider in detail all stages of the geological development of oil-promising areas of the territory during which it is possible not only to form deposits but also their subsequent reformation and disbanding.
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Evaluation of 4D Effects Based on the Results of the Repeated Survey Within the Water Area of the Novatek Gas-condensate Field
Authors S.S. Sanin, V. I. Kuznetsov, Yu.N. Dolgikh and D.S. TataurovSummaryThe company NOVATEK performed in 2008–2010 the 3D seismic works within the aquatorial part of the gas condensate field.
The main geological tasks were the detailed exploration and forecast for the Cretaceous deposits’ reservoir properties.
To engage in development the new prospective targets in the underlying intervals, there was a 3D survey performed in 2017
Based on the results of the work, 2 sets of data were obtained for the same area within a time difference of 7–8 years, which provided the opportunities for estimating 4D effects of the tanks being in service all these years.
The report presents the results of modeling and analysis of the real 4D effects, characterizing the processes of development and operation, as well as pointing to the reserves of improvement of the efficiency of these processes.
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Formation Micro Imager (FMI) Processing and Interpretation in the Paleozoic Deposits
By S. ChizhovaSummaryStudying fracturing is a crucial aspect of pay zones prediction. Contemporary methods of studying rock formations allow to assess the fracturing of the formations examined and define their textural features. Formation Micro Imager (FMI) allows to solve the following challenges: identify the elements of structural abundance; define the angles of incidence and strike angles; identify thin bedded manifolds, determine the systems of fractures; determine the decompaction zones precisely; extract additional information about non core pay zones and select zones for testing. Formation Micro Imager (FMI) has already been used in geophysics, however, applying this method to effusive igneous sedimentary complex could solve certain unconventional challenges.
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Integrated Solution for Geological Modeling of Deposits. From Interpretation of Seismic to Structural Modeling With the Possibility of Estimating Uncertainties
Authors E. Volk and M. SafronovSummaryThe integrated solution implemented within a single interface and database has a set of innovative technologies for a full cycle of geological modeling, , from seismic interpretation to calculation of reserves, including on multivariate models, taking into account given uncertainties and risks.
The approach is based on the modeling graph - Workflow used to automate the process of modeling, updating and calculating the set of model realizations. The workflow is appropriate for the evaluation of significant contingent resources and for the reliable quantification of commercial reserves. It is also suitable for providing input to development plans and concept design choices, and for management of fields in early phases of production.
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