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7th EAGE Saint Petersburg International Conference and Exhibition
- Conference date: 11 Apr 2016 - 14 Apr 2016
- Location: Saint Petersburg, Russia
- ISBN: 978-94-6282-179-8
- Published: 11 April 2016
181 - 198 of 198 results
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Multi-Layered Seismic Inversion - a Universal Integration Method of Different-Scale Geological and Geophysical Studies
Authors V.I. Ryzhkov, D.A. Danko and S.V. FilimonenkoThanks to achievements in rock-physics geologists and reservoir engineers widely use results of seismic inversion. The main question for the experts applying seismic impedances is how to integrate the different scales of studies: from microsections to seismic frequencies. In this paper for development of oilfield litho-facial model we suggest to use multi-layered amplitude inversion (MLI) in which the solution is sought for the individual layers, being characterized by particular lithological and petrophysical properties. Realization of MLI is a problem of collaboration of geologists and geophysicists. Only in this case, we understand what thickness, lithology, facies and petrophysical parameters are characterized each of the layers at the output impedances volume. The presented results obtained on the basis of the algorithm of MLI developed by the authors showed increase informativeness of acoustic and elastic impedance estimates in case of high contrast medium. The resulted layered model makes it easier to litho-facial and petrophysical interpretation of the data, for example, by the using of different rock-physics models for each individual layer. The presented decision allows in future to take into account the anisotropy of the layers, and to implement layered stochastic downscaling.
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New CGG Methods for Quantitate Estimation of Seismic Anisotropy
Authors M. Romanenko and A. KharitonovThe development of a specialized WAZ-processing technology makes it possible to obtain more reliable characteristics of the studied environment and expands on the calculation and interpretation of the anisotropy parameters based on the analysis of dynamic characteristics of seismic data. The paper reviews new approaches to the calculation of the anisotropy parameters on the basis of the Fourier transforms, analyze their applicability, limitations and prospects of their usage.
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New technology of azimuthal inversion for anisotropy studies, and special features of seismic data preprocessing
Authors K.E. Filippova, I. Yakovleva and Y. PavlovskiyПравильное определение анизотропных свойств является ключевым вопросом при идентификации перспективных для разработки пластов. В докладе продемонстрирована технология азимутальной инверсии для изучения анизотропии и влияние обработки сейсмических данных на получаемые результаты.
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Using the Results of Azimuthal Inversion to Optimize the Development Plans of Low-Permeable Reservoirs
Authors I.P. Yakovleva, K.E. Filippova and Y.V. PavlovskiyThe study of seismic anisotropy and the different effects associated with it is the subject of advanced research for geophysicists engaged in unconventional and fractured reservoirs. Seismic anisotropy can be caused by various geological reasons, often the reason for this is the presence of the fracture interval or differences in the horizontal stresses in particular geological section. Indeed, in both cases, taking into account the causes of seismic anisotropy will have a significant impact on exploration drilling, field development optimization plans, etc. This paper presents the possibility of using the results of the interpretation of the azimuthal inversion to optimize development plans for low-permeability reservoirs. The elastic properties delivered by the anisotropic inversion are very useful to update the results of reservoir characterization. Predicted azimuth of maximum horizontal stress is valuable information for the planning of horizontal wells. For successful implementation of fracking in horizontal wells wellbore must have a direction perpendicular to the azimuth of maximum horizontal stress. Overall anisotropy parameters are key factors in identifying perspective areas and setting of horizontal wells
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Lateral Distribution Estimation of Geological Risks Related to Structural Uncertainty
Authors T.I. Khasanov, A.A. Kurkin, S.A. Fedorov and E.A. ZyzaIn this work a method of lateral distribution estimation of structural uncertainty is proposed, which considers factors of uncertainty related to determination errors of seismic data initial parameters. The estimation is delivered in a deterministic way during the analysis of internal convergence of seismic data. Determination errors of kinematic parameters are estimated: time and velocity. External convergence of seismic data with well data is taken into account. As the result, a map of standard deviation of structural surface is calculated which then is used to construct a probability (risk) map of a structural closure.
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Effect of processing procedures on the seismic signals form reflected from thin-layers objects
Authors V.N. Bespechniy, G.M. Mitrofanov and E.V. MosyaginAspects relating to the procedures of seismic data processing, in particular the summation, which can affect the dynamic characteristics of the target signals, reducing the quality of results in the interpretation of complex thin-layered objects, are discussed. Detailed studies on the effect of processing procedures on the interference signals form can significantly improve the quality of the used inverse algorithms. Such studies are especially important given the use of the now considerable multiplicity of observations, fundamentally aimed at improving the accuracy of subsequent solutions of interpretive tasks related to the regions of Western and Eastern Siberia. Researches were carried out in the framework of thin-layered models of target objects which are greatest interest for oil and gas exploration
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Synthetic Seismic Models Construction for Detailed Geological Outcrop Description
Authors E.V. Fedorova, N.V. Bukhanov and V.E. BaranovThe purpose of this study is to examine the seismic response of fluvial deposits by using the method of forward seismic modelling. The studied outcrop is located in Kemerovo Region, 250 km from Tomsk and is about 500 m in length and about 30 m height. The exposure deposits belong to the fluvial depositional environment and the age of sediments is Lower Cretaceous. In this work the synthetic model construction was provided with the help of simple convolution-based method. Modeling was performed in two software products Petrel and Madagascar. To construct the impedance cube, petrophysical properties were taken from the analogue field, which formed in similar depositional environment. The sensitivity analysis of detailed seismic pictures on the frequency change was carried out. Thus, 8 models were built in a frequency range of 25 to 200 Hz in steps of 25 Hz. Attribute analysis was provided to estimate the ability of Net to Gross ratio of fluvial reservoir forecasting by using seismic attributes. Furthermore, an analysis of the effect of fluid saturation on seismic image of fluvial deposits was conducted.
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Geoelectrochemical Methods: Response to Criticism and Discussion of CHIM and MDI Methods Characteristics
Authors S.G. Alekseev, N.P. Senchina and S.Y. ShatkevichThis paper is a response to the article [1], which discusses the various geophysical methods, classified to the category of "voodoo." As one of examples is used one of geoelectrochemical methods - CHIM (method of metals partial extraction), it is determined by the USGS (United States Geological Survey) as non-effective. This gave rise to classify this method as "voodoo". In operation performed by the CHIM, we can detect extraction of gold due to electric current. At one of the fields, it has been demonstrated that the gold was extracted in identical amounts in case of electric current presence and without it. According to the author [1], it is sufficient for the allegation that the methods do not work so good, as "it was stated." But essentially there were used two different methods - CHIM and MDI (diffusion extraction method). Results of this methods can be connected. Why, and what is different? - this questions are discussed in this paper. The report examines in detail features of both methods. The paper provides examples of their successful application in the search for a variety of mineral deposits. 1. VOODOO METHODS: DEALING WITH THE DARK SIDE OF GEOPHYSICS. SAGEEP proceedings, 2005, p.315-327.
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Integration of Non-Seismic Methods in Identifying Oil and Gas Deposits in Keeping with the Geo-Soliton Theory
Authors M.I. Ryskin, E.N. Volkova, V.Y. Shigaev and E.A. VlasenkoThe paper proposes a set of methods for identifying oil and gas deposits, including gravity and magnetic prospecting, geoelectrochemistry, soil gas sampling, and thermomagnetometry. Its distinctive feature is that it draws on methods that allow to obtain direct information on oil and gas reserves (in terms of their formation and fluidization). These are both geochemical methods and methods that combine indirect geophysical and geochemical indicators. This allows for a radical improvement in reliability of predicted results. All these methods detect a similar pattern of circular anomaly with a minimum in its center. A similar pattern of the distribution of anomalies makes it possible to present the results of the field phase in a single cartographic document compiled from all maps based on individual methods, after they have been pre-normalized to adjust dimensions. The paper provides specific examples of how these methods can be used.
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Geoinformation Technology for Prospecting of Groundwater for Water Supply of Oil and Gas Facilities in Eastern Siberia
Authors A.V. Parshin and L.I. AuzinaEastern Siberia is one of the prospective hydrocarbon areas. Existing and new fields need water to ensure the economic and technological needs. In the little-studied regions of Eastern Siberia locating wells based on direct hydrogeological features not bring the desired result.The aim is to improve the efficiency of geological exploration in the field of groundwater in complex geological and hydrogeological conditions of oil and gas fields in Eastern Siberia. To maximize the effectiveness of consolidating information and improving the accuracy of forecasting method applied expert estimations and modern GIS technology. The technology is based primarily on archival and remote of the data that allows forecast at the stage of design work. On the basis of the GIS project calculated qualitatively new spatial information, aquatic and morphostructural. Factor analysis allowed to identify from all of the geodata – compact set of indicators related to the abundance of water. For this set proposes scientifically based methods of indicators scaling and mapping. Given a method for the calculation and mapping the new complex index of watery, integrating individual features. Applied open GIS technology, significantly increasing the cost-effectiveness of geological exploration. The proposed approach has shown its legitimacy on some fields Chonskoy group.
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Space Thematic Spectral Anomalies And Forecast For Oil And Gas
Authors V.S. Antipov, E.A. Zhuravlev and K.A. VolinIt has been shown the basic methodical conditions of development and use of space thematic spectral anomalies of prospecting for oil and gas. The examples of the anomalies of the spectral brightness above the hydrocarbon deposits in Russia, Tunisia, Argentina, and Egypt are shown. The results of the forecast for oil and gas on the territory of these countries are also shown based on the identification of spectral anomalies.
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Low-Altitude Aeromagnetic Survey: Drones and High Frequency Magnetometers. Experiences and Perspectives
Authors M.I. Epov, A.P. Firsov, I.N. Zligostev, A.V. Savluk, A.Y. Bondarenko, P.A. Weisman, A.S. Kolesov and A.S. SheremetGrowth of the mineral resource base requires geological and geophysical studies in difficult-access conditions. Airborne geophysical survey is usually carried out during small-scale works. Large-scale surveys are conducted on foot. Most of Russia's territory is characterized by harsh conditions for such magnetic surveys - which is one of the main tools of geological and geophysical study of the territory. That is differentiated relief, boreal forests with thick undergrowth, stone runs, marshy tundra and so on. This increases the cost of the work. The use of large-scale airborne geophysical surveys is almost impossible for several reasons. Very high cost of using the carrier use (helicopters and planes). Detailed work requires a very low areal speed — below 10 m/s, and the high frequency of the magnetometer, above 100 Hz, which in turn dramatically reduces the accuracy of the survey. We propose to designate a special kind of low-altitude surveying at extremely low altitudes using a high-frequency magnetometer. Designed specifically for this type of surveys, our magnetometer complex has a frequency greater than 1.5 kHz, and the accuracy of the measurement system of the entire field is not less than 1 nT. The surveying complex is designed on base of light and ultralight drones. Experimental work on various objects (from archaeological to geological: burial mounds, skarn deposits, kimberlite pipes, geological mapping of volcanic and sedimentary rocks, etc.) has shown high efficiency of this survey type. High performance and low cost combined with the level of details in results, comparable to surveying on foot at high altitude flights, and exceeding it at low altitudes
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Physical Modeling of Electromagnetic Soundings for Justification of New Geological Exploration Technologies
Authors N.Y. Bobrov, V.V. Polovkov and D.A. PopovIt is shown that despite great development of algorithmic and software tools and possibilities of computers in the last decades, physical (analog) modeling retains considerable potential. It is used for the verification of calculations of electromagnetic field propagation in electrically contrast media and for testing new techniques of electrical prospecting. The results of physical modeling carried out for evaluation possibilities of TEM soundings in the regions of saline-domes tectonics are presented. The electrolytic tank equipped for joint modeling of seismic and electromagnetic soundings of complex geological media is presented. One of its tasks is obtaining experimental records for testing algorithms of joined inversion of seismic and electromagnetic data
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Synchronism of Geophysical Fields and Weather Conditions in the Near-Surface Zone of the Earth
Authors S.A. Riabova and A.A. SpivakGeophysical fields are an important integral part of our planet, which combine internal and external geospheres into a single self-regulating system. They contain information about properties and structure of geospheres. Variations of geophysical fields can judge the changing modes of geophysical processes. It is relevant for solving fundamental and applied problems of geophysics, in particular: for determination of the behavior patterns of inner and outer shells of the Earth, for prospecting and exploration of mineral resources, for description of the geodynamic activity of local zones of the earth's crust. The results of the analysis of synchronous variations of electric and magnetic fields, as well as acoustic waves in the near-surface zone of the Earth compare to the variation of weather condition. We show a synchronism of variations of these fields and atmosphere’s parameters. For the first time we mark not only synchronous, but also forward-looking developments of disturbances of the geomagnetic field. We introduce a new parameter — "reverse magnetic tipper". Variations of the "reverse magnetic tipper" in atmospheric disturbances appear more pronounced in comparison with the variations of the magnetic tipper.
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The Middle Ob’ Oils (West Siberia): the Geochemical Peculiarities and Genesis
More LessThe work generalizes the results of geochemical studies of Middle Ob’ oils (West Siberia) from Mesozoic deposits. Features of physicochemical and hydrocarbon (HC) composition showed the studied oils are mainly aquagene genesis. These oils are most likely to have be derived from mature organic matter of the Bazhenovo Formation. The differences observed in the studied oils can be explained by differences in biogeochemical facies of the Bazhenov Sea (the oxidation-reducing conditions of diagenesis, hydrodynamics and salt regime of the sea basin, the biota). On the other hand, the vertical migration of oil components from source-rock stratum J1-2 with mixed composition of OM can not be excluded. The strong contrast of light arenes distribution suggests the impact of the migration processes on the composition of most of the investigated oils. In the studied sampling, two samples have been revealed GC chromatograms of the saturated fraction of which are non-separated "naphthenic" hump that does not allow the identification of n alkanes and acyclic isoprenanes. There are biodegraded oils. But biodegradation has not affected the distribution of steranes and terpanes in these oils
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Geological Descriptiveness for Specialized Methods in the Investigation of Oriented Core Samples
Authors L.A. Krasnoschekova, D.A. Cherdantseva and V.P. MerkulovThe paper deals with the problem of studying spatial anisotropy of hydrocarbon reservoirs using paleomagnetic oriented core samples. Oriented rock samples were studied using complex specialized methods which included specifications of paleomagnetic, petrophysical, lithological, morphological and microstructural sandstones features. As a result, of investigation increase in the parameters of magnetic and acoustic field fluctuations in core samples were determined. Maximum of these parameters are connected with prevalent directions of quartz grains orientation and confirm with the direction of maximum permeability sandstone reservoirs. The anisotropy data for lithological, petrophysical and filtration properties in samples from the studied deposits indicate consistency changes of these characteristics. The joint application of lithological and petrophysical methods allows to receive additional volume of geological information and use it to construct real anisotropic geological and hydrodynamic models of oil fields.
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Lithological-petrophysical characterization of Ovinparm reservoir rocks in the north-easten part of Khoreyver Depression
Authors O.V. Sivalneva, S.Y. Rudakovskaya and K.Y. OlenovaAs a result of lithological and petrophysical investigation the three main types of Ovinparm reservoir rocks were determined: 1-fracture dominated, 2-pore dominated, 3-vugg dominated. The types are defined by primary structure of biogherm framework of the dolomitized rocks. It is necessary to use the computer tomography in conjunction with standart petrophysical and lithological investigation for correct characterization of the reservoir potential.
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A new petrophysical model for acoustic hysteresis based on transverse wave velocity measurements
Authors M. Dobroka and J. Somogyine MolnarIt is well known that acoustic wave propagation under pressure is very nonlinear and the elastic properties of rocks are hysteretic, which behaviour is important for mechanical understanding of reservoirs during depletion. Pressure strongly influences the elastic parameters of rocks, thus wave velocities too. Therefore a quantitative model - which provides the physical explanation - of the mechanism of pressure dependence is required. In this paper a petrophysical model is presented which describes the connection between the propagation velocity of transverse wave and rock pressure both in case of loading and unloading phases as well as explains the mechanism of acoustic hysteresis. The developed model is based on the idea that the pores in rocks close under loading and reopen during unloading. The advantage of the model is that it is not based on simple curve fitting, but gives physical explanation for the process with three-parameter exponential equations. The model was applied with success to acoustic S wave velocity data sets measured under pressure in laboratory on sandstone samples by an automatic acoustic test system.
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