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Saint Petersburg 2018
- Conference date: April 9-12, 2018
- Location: Saint Petersburg, Russia
- Published: 09 April 2018
61 - 80 of 230 results
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Modeling Systems of Magmatic Fracking Beneath Active Volcanoes
Authors A.V. Kiryukhin, S.A. Fedotov and P.A. KiryukhinSummaryThe analysis of local seismicity within active volcanoes (Avacha–Koryaksky cluster, Mutnovsky-Gorelovsky cluster, Kluchevskoy group) during the 2000–2017 period revealed a sequence of plane-oriented earthquake clusters that we interpret as a process of dike and sill injections (magmatic fracking). Magmatic fracking within volcanic systems causes the formation of permeable reservoirs with a vertical extent of 35 km (Kluchevskoy vol.) and a lateral extent of 15 km (Shiveluch vol.) depending on geomechanical conditions of host rocks. These reservoirs are subject to the following hydrothermal circulation with possibilities of creation of geothermal reservoirs and/or hydrocarbon concentration. TOUGH2-EOS1-sc modeling is used to estimate the conditions of hydrothermal reservoirs formation in a range of temperatures up to 1200 oC and pressures up to 1000 bars.
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Modern Approaches to Identify the Properties of Reservoir Hydrocarbon Fluids of Two-Phase Deposits (On the Example of the Deposit in Western Siberia)
Authors I.O. Promzelev, A.I. Brusilovskiy, D.N. Kuporosov and S.A. FedorovskiySummaryThe paper deals with methodical approach to reproduce the properties of saturated reservoir oil, which is in thermodynamic equilibrium with the existing gas cap. The method is based on the integrated application of the results of laboratory experiments and mathematical simulation using equation-of-state method. The results are illustrated on the example of oil reservoir PK1-3 of Vostochno-Messoyakhskoe field. It is confirmed that in the case of partially degassed (nonrepresentative) downhole sample of reservoir hydrocarbon fluid it can be restored by simulating the process opposite to the differential liberation in the reservoir conditions. The described methodical approach is recommended to identify representative composition and PVT properties of reservoir oil of two-phase deposits. It is important for the correct evaluation of the oil and dissolved gas reserves and designing the development of two-phase deposits.
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A Multi-scale Geostatistical Method of Evaluating the Elastic Properties of Rock from Digital Core
Authors Ya. Bazaikin, T. Khachkova, D. Kolyukhin, V. Lisitsa, G. Reshetova, B. Gurevich and M. LebedevSummaryEstimations of the elastic properties of a core sample are extremely sensitive to the quality of the CT-scan image. A coarse image resolution does not allow separating the grains and estimating their roughness. The size of images with fine resolution is either below representative volume or so representatively large that require huge computational resources for the numerical simulation of static loading tests. We present a new multi-scale numerical methodology that combines the geostatistics, computational topology and numerical upscaling. The essence of the approach is to estimate the distribution of the grain surface roughness, the distance between them and cement material by microscopic images (SEM), then to calculate the effective parameters of cement distribution for an equivalent model with flat contacts between grains. Finally, to use this effective cement to fill the interfaces between grains in a digital model built on CT images of medium resolution by computational topology.
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Comparative Analysis of Methods for Solving Cross-Well Tomography Problem
By A. KirilenkoSummaryThe work involves comparative analysis for solving cross-well tomography problem in spaces L2, L1 and L0. There is short overview of techniques which allow to solve conditional minimization problem in space Lp, where p<1. It is also presented results of numerical experiments for reconstruction sparse solution in case of “checkerboard” model.
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Improving of Geological Petroleum Zoning of the Northern Timan-Pechora Province
Authors O. Prischepa, V. Bogatsky, O. Chumakova, M. Shaburova and A. KuranovSummaryThe results of regional geological exploration activity carried out according with the state programs in the period 2009–2016 in the northern part of the onshore and offshore Timan-Pechora Province made it possible to order the several tectonic elements of different ranks, establishing their hierarchical subordination and determine the characteristic features of the geological structures. A joint analysis of retrospective results and interpretation of field seismic surveys made it possible to draw up a unitary tectonic conception and trace the main tectonics elements of the Timan-Pechora Basin in its offshore part. Comprehensive geochemical studies based on core wells of the northern onshore part of the studied area made it possible to assess the potential of similar petroleum habitats with the characteristics of generation, migration and accumulation peculiarities. Tectonical, lithological and geochemical features made possible to detail the concept of geological petroleum zoning, in which two new ones - Malozemelsk-Kolguevsk and Pripaikheisk-Priyuzhnonovozemelsk units - were assigned to the rank of the regions. In the western part, promising sedimentary sequences have been identified in the basal part of the sedimentary cover. They can substantially increase hydrocarbon potential of the onshore and offshore of the Timan-Pechora Province.
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Exploring the Posterior Model Space of Seismic Inversion
By P. ThoreSummaryProviding the possible diversity of the reservoir model is a key issue for risk assessment during the life of a field. Elastic parameters, obtained from seismic inversion, which are a major source of information for building reservoir model, should cover as much as possible this diversity.
Whatever type of seismic inversion used, it relies on a set of prior hyper parameters such as the wavelet, the parameter correlation, the various model constraint types (the lateral and vertical correlations…), the low frequency model, the signal to noise ratio… which all have their own uncertainties.
In this paper we demonstrate that drawing realizations of elastic parameters around a posterior mean for a given set of hyper parameters is not enough to explore the posterior model space. We show that including in the seismic inversion the uncertainties associated with the hyper parameters enables to get closer to an extensive exploration of the posterior model space.
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Interpretation of Results Gravity Monitoring of Karst Processes
Authors S. Bychkov, A. Michurin and A. SimanovSummaryMonitoring observations of gravity field allow to reveal the dynamics of deformation processes of rock masses and to carry out the forecast of dangerous and catastrophic situations. Based on the results of repeated observations, a dynamic gravity anomaly is calculated, defined as the difference between the subsequent and previous values of gravity. Since all the invariant components of the gravitational field are equally present in any pair of observations, the dynamic anomaly reflects only a specific mining or fast flowing geological process. The main noise-producing factors during gravimetric monitoring are considered, methods for interpreting dynamic anomalies are suggested, examples of gravimetric studies at emergency sections of mines are given.
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The Tomographic Transform of the Gravity Field and Their Geological Interpretation
By S. BychkovSummaryAt the present time, numerous methods of transformation have been developed that allow us to divide the gravitational field into components that are identified with the influence of various deep layers of rocks with a minimum of a priori information about the sources. The possibility of obtaining a three-dimensional picture of the field distribution in space makes these methods very attractive for geologists and geophysicists. Often geological interpretation of 3D images, the field is reduced to the application of the shear volume of models of fields contours, geological features or stratigraphic boundaries. This approach to the interpretation of the results of the tomographic transformation of the field is not completely valid. Only the use of methods of quantitative interpretation makes it possible to create a physical-geological model of the geological section from the 3D model of the field.
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Azimuthal AVO Modeling for Fractured Zones Identification – a Feasibility Case Study
More LessSummaryFractured zones are of great interest because they generally lead to higher reservoir permeability. Forward seismic modeling is essential when studying the ability of azimuthal AVO attributes to detect such zones. For proper modeling, one has to determine effective elastic parameters of a fractured reservoir using all available core and well log information.
In this paper, linear slip theory and penny-shaped crack model are utilised to integrate borehole micro-imaging and cross-dipole sonic logging data obtained in a single well. Fracture properties are used to estimate the properties of an anisotropic effective medium corresponding to the zone of interest. Seismic modeling shows the expected azimuthal response and allows determining optimal attributes to study the presence and properties of fractures. This study also analyses stability of AVOAz-attributes when the data is contaminated by random noise.
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Petroleum Prospects of the Domanik Formation in Timano-Pechora Province
Authors O. Prischepa, E. Grokhotov, I. Makarova, O. Averyanova and V. NikiforovaSummaryDetailed litho-facial, palaeontological and organic matter studies was carried out, aimed developing an optimal approach to assessing their remaining reserves potential. The features of generation, migration and conservation of hydrocarbons in the Domanik reservoir, based on bituminous analysis with preliminary separation of bitumoids into epigenetic and syngenetic, are considered. On the basis of a detailed layer-by-layer study of Domanikit from outcrops and shallow wells sections in the Ukhta area, sharp differences in the maturity range of organic matter, determined from different thin lithotypes, were revealed. An assumption is made about the significant influence of the lithotypes on the character and scale of the hydrocarbons generation. Conclusions are drawn about the significant petroleum potential of the petroleum bearing strata, in particular, the Vetlasian level, analog with Domanik Formation.
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New Field Equipment and Techniques for Improving the Quality of Land Seismic Data
Authors T. Fleure, W. Halvorson and A. CherepovskiySummaryA new revolution in land seismic started at the beginning of the 21st century. Cable-based recording systems are gradually being replaced by cableless systems, especially in the Western hemisphere. Several different autonomous and radio telemetry cableless systems were developed and put into operation during the last ten years, but autonomous systems using external geophone groups were initially the most popular. The newest generation of cableless recording system can be characterized as compact nodes using an internally located high-sensitivity geophones and batteries, thus avoiding any external connections. The fully self-contained design makes it easier to bury these nodes at or below ground level which ensures significant advantages both in the fidelity of the recorded seismic signal and consistency of coupling from receiver to receiver. The shape of the node being reviewed is specifically designed to allow manual deployment with a slide hammer or automated deployment with a mechanical / hydraulic machine (ADS or Automator). The Automator is equipped with a powerful hydraulically activated hole puncher for planting the nodes vertically into the ground under various ground conditions. The Automator can be pulled by the appropriate chosen wheeled or tracked (low ground pressure) off-road vehicles based on conditions. Adoption of this new field technology can provide significant reduction of field personnel and will certainly improve the productivity and efficiency of seismic acquisition operations.
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Statistical Analysis of Seismic Images of Fault Zones on the Base of Fault Facial Model
SummaryInterpretation of seismic responses from subsurface fault zones is hampered by the fact that the geological structure and property distributions of fault zones can generally not be directly observed. This shortcoming curtails the use of seismic data for characterizing internal structure and properties of fault zones, and has instead promoted the use of interpretation techniques which tend to simplify actual structural complexity by rendering faults as lines and planes rather than volumes of deformed rock. Facilitating correlation of rock properties and seismic images of fault zones would enable active use of these images for interpreting fault zones, which in turn would improve our ability to assess the impact of fault zones on subsurface fluid flow. The present study employs a combination of 3D fault zones models, based on empirical data, and 2D forward seismic modeling to investigate the link between fault zone properties and seismic response. A comparison of spatial statistics from the geological models and the seismic images was carried out to study how well seismic images render the modelled geological features. Our results show the feasibility of extracting information about fault zone structures from seismic data by the methods employed.
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Zakeen and Faraghoun Formation as New Source Rocks of Palaeozoic Era in Persian Gulf and Coastal Fars South Iran
Authors M.H. Saberi and Mr JalilianSummaryOne of the most important and prevalent methods is been addressed Rock-Eval pyrolysis. In this study we have investigated and evaluated source rocks (Sarchahan, Zakeen, Faraghoun) with the method of non-identical temperature by the means of Rock-Eval 6 apparatus in the Persian Gulf and the Coastal Fars. In this study, Rock-Eval pyrolysis has been accomplished with heating rate of 25 °C/min, furthermore for reaching kinetic parameter, this analysis is done with 3 different heating rates of 5 15, 25 °C/min with Optkin software.
Analysis shows that kerogen types for different formations as below, Sarchahan: kerogen type II, II/III and HI of 93 mg/g, Zakeen: kerogen type III, II/III and HI 49 mg/g and Faraghoun: kerogen type III and HI 150 mg/g.
In Former studies of this area, the only known source rock is said to be as Sarchahan Formation. But with investigation of paleo logs, Rock-Eval analysis and kinetic parameters we can state that the presence of this shale layer (coal layer) in studied formation, we state that not only Sarchahan is a source rock, but also Zakeen and Faraghoun formations can play a good role as prolific source rocks.
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Multivariate Analysis of Seismic Attributes by the Principal Component Method
By I. MityuninaSummaryThe possibilities of multiattribute analysis of seismic data by the principal component method are considered. A technology based on a comprehensive assessment of the statistical characteristics of a data set, classification and factor analysis of a multidimensional space of seismic attributes is presented. The technology is implemented on the basis of multivariate analysis of raster spatial data models in the geographic information system ArcGIS. Practical examples of the successful application of technology for forecasting effective reservoir thicknesses in the interwell space are given.
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Prognosis of High-Capacity Intervals of the Carbonate Reservoir by Analyzing the Seismic Scattering Energy
Authors D.A. Petrov, A.A. Kozyaev, A.A. Melnik, A.A. Tuzovskiy, V.V. Shilikov and A.S. MerzlikinaSummaryAn approach to prognosis of the zones of improved reservoir properties of the carbonate cavernous-fractured reservoir in areas of Eastern Siberia by special processing and interpretation of the scattered component the seismic waves (own development of RN-KrasnoyarskNIPIneft LLC) is considered in this paper. The approach can be applied to will reduce the uncertainties associated with the geological structure and increases the reliability of the forecast productive characteristics.
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Petroelastic modeling is the basement of reliable seismic inversion reservoir characterization in saline section of Eastern Siberia
Authors A. Rzaeva, V. Vorobyev and A. OstankovSummaryThe work presents the results of well data analysis and petroelastic modeling in saline clastic and carbonate sections of Eastern Siberia fields. The core data analysis indicates a significant effect of salinization on the porosity and permeability properies of rock, which affects the presence of reservoir in wells. Such deposits require an integrated study to the interpretation and analysis of well data. The degree of detail and reliability of the petroelastic model in salin conditions of clastic and carbonate rocks is determined by the input data: set of logs and its quality, core data analysis, etc. Modeling of elastic properties was performed with usage the model of effective media. There are models which allow to take into account different salt distribution in the pore space, depending on the rock wettability. The main feature of such models is that the shear modulus of pore fluid isn’t equal to zero. Taking into account that the target interval is represented by laminated rocks, the best choice for seismic reservoir characterization will be pre-stack geostatistical inversion algorithm. Effective thickness of reservoirs, porosity and volume of salt in pore space affect the reliability of seismic inversion reservoir characterization.
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Determination of the Angular Attributes of Seismic Boundaries According to the Data of CDP 3D and Prospects for Their Use
Authors V.I. Bondarev and S.M. KrylatkovSummaryThe technology for determining the angular parameters of the reflecting boundaries by the data of the CDP 3D for the purpose of subsequently taking this information into account when constructing a seismic image of the geological environment and forming arrays of new attributes of seismic wave fields.
The basis of this technology is the original way of asymmetrical formation of seismograms of the new type. After the introduction of special kinematic corrections to these seismograms, it becomes possible to determine the values of azimuths and the slope angles of the boundaries as a function of the depth or time of reflection on the basis of an adjustable directional analysis of the residual wave field.
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New rock physical model describing the pressure dependence and hysteresis of acoustic velocities
Authors A. Kiss, J. Somogyi Molnár, M. Dobróka and T. OrmosSummaryIn this paper new rock physical model describing the hysteretic pressure dependence of acoustic wave velocities is presented. The model is able to consider two or more physical mechanisms responsible for the pressure dependence of the propagation characteristics (for example the closing/opening of microcracks and the change of pore volume by virtue of the change in the rock pressure). Our rock physical model was successfully used as forward modelling equations in the inversion of longitudinal velocity data measured on core samples originated from oil drilling wells and also seismic/acoustic velocity data sets published in the literature.
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Fracture Networks Delineation Techniques with 3d Seismic Attributes. Example from Russian Far Eastern Sea Offshore
Authors D. Sirotenko and O. ErzhSummaryThe purpose of this abstract is the fracture networks delineation techniques presentation. 3D seismic attributes and structure interpretation results from Russian Far Eastern Sea offshore. 3D volume were used for this Quantitative Interpretation (QI) techniques. The database of fracture networks was built and its quantitative analysis was performed. Statistical analysis of spherical data and eigenvalues of the orientation tensor were applied. Results: refinement of fracture networks anisotropic models (fracture - induced anisotropy has two components: transverse-isotropic and orthorhombic); fracture networks database built and analyzed; average fracture networks orientations of oil-gas intervals were calculated; the importance of strike-slip tectonics for Far Eastern Sea offshore was confirmed.
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Net Pay Risk Asessment Worflow Based on Multiple Realizations of Pre-Stack Geostatistical Inversion (Western Seberia Field Case Study)
Authors K.E. Filippova, S.L. Fedotov, I. Nizhegorodova and H. LaufertsSummaryEach oil and gas field at certain stage of development is characterized by variety of geological and geophysical studies and by the quantity and quality of available information. Also depending on the development stage geological objectives strongly differ. For example, a bluefield project starts with a completely undeveloped area and the main objectives of this stage are field discovery and ballpark reserves estimation. Obtaining lateral reservoir distribution from seismic data is usually done at the greenfield stage. A brownfield project requires a detailed 3D reservoir model of a target interval. Additional details are critical when building geological and hydrodynamic models or planning production well patterns. Usually, a reservoir model is significantly more complicated at the brownfield than at the bluefield stage.
The efficiency of geostatistical inversion for risk assessment is presented in this paper in the form of oil field case study
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