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Saint Petersburg 2018
- Conference date: April 9-12, 2018
- Location: Saint Petersburg, Russia
- Published: 09 April 2018
221 - 230 of 230 results
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Substantiation of Direct Detection and Mapping of Fluid-saturated Fractured Reservoirs Using Reservoir-generated Scattered Waves
Authors V. Leviant, I. Kvasov and I. PetrovSummaryMethods to detect fluid-saturated fractured prospects are based on significant difference in position of maximum wave amplitudes: reflections in source region; scattered converted waves - in near field on offsets shorter than prospect depth; and scattered compressional waves - on longest offsets.
Detecting scattered compressional waves under said conditions among reflections from acoustic boundaries is based on opposite character of AVO-curves for scattered and reflected waves. For waves scattered by fluid-saturated fractures, stacked amplitudes of far channels are always higher than of near channels when impedance abruptly changes to zero or to positive at bed top. Their ratio is greater than 1. For reflections from acoustic boundaries, stacked amplitudes from far channels usually are lower than from near channels, while ratio of their amplitude sums is always smaller than 1. Another method to identify compressional wave type from its AVO-curve gradient sign uses midlength source-receiver distances. Gradient sign should be positive for scattered wave and negative for reflection.
Indicators to detect fluid-filled mesofracture zones from X-component data are based on: high relative strength of scattered converted waves in near field; differences in structure and strength of converted wavefield with polarity reversal on either receiver spread side; shift of zero on AVO-curve. These diagnostic indicators may effectively be complemented with summing no-phase-change recordings from either spreadside.
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Geological Uplift and Erosion - Impact on Reservoir Quality of Petroleum Systems in the Barents Sea
Authors A. Novoselov, E. Bykova and E. HenriksenSummaryUplift and erosion events in the geological history of the sedimentary basins resulted in destruction of hydrocarbon traps and accumulations in the Barents Sea. Magnitude of this impact was different in different basins. In our study we use and integrate Different data available, from Russian and Norwegian sectors of the Barents Sea, has been used in order to estimate regional trends in the area. and extend of these events. Understanding of maximum burial depth of the sediments give important information about reservoir quality, source rock maturation and migration in an area. for estimation of the magnitude of uplift. The trends in porosity variation evaluated from well data can be used for restoration of to maximum burial of different formations. Regional porosity and temperature trends for various reservoirs in the Barents Sea were studied to estimate maximum burial depth of the sediments. Mapped trends of reservoir properties on the regional basis improve accuracy of our predictions in frontier areas of the Barents Sea.
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Prospects for the Usage of Crosshole Seismic Testing in Oil and Gas Seismic Survey Complex
Authors A. Galperina, A. Oshkin, V. Ignatev, A. Konkov and R. ErmakovSummaryThe crosshole seismic testing method has a great potential. In the course of observations a dense network of seismic rays is obtained that travel through the region of interest. As a result, the method provides enhanced approaching the object of research. There are two ways of obtaining crosshole sections: migration and crosswell CRP. Basically, the dominated frequency of crosswell seismic data is higher than the dominated frequency of surface seismic data by several times. The imaging derived from the data can indicate the geological structure between wells clearly and can be used for detailing reservoir characterization and residual oil potential seeking. The source and receiver in such a way are close to the interface formation, so that the wavefield of crosshole seismic testing can receive more information and much more complex than of the surface seismics or VSP.
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The Possibility of Applying the Technology of Simultaneously Operating Pulsed Sources for the Purposes of Seismic Survey of High and Ultrahigh Resolution
Authors V. Ignatev, A. Tarasov, A. Shuvalov, A. Oshkin and A. KonkovSummaryThis paper considers the possibilities of simultaneous source technology, the ways of processing data obtained by such sources, and the prospects for using sources of this type in high and ultra high resolution seismic surveys. The method for separation the data for each of the sources is proposed. The resolution power of the technology on the model data is estimated.
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Recovery of Fine Structure of Cavernous Reservoirs by Scattered Waves Imaging
SummaryIn the recent study of the Yurubcheno - Tokhomskoye oil field more and more attention is paid to the Riphean intervals with high cavitary. Current estimates of specialists working in this area forecast about 30% of geological reserves of hydrocarbons within these intervals. At the moment nor the origin or dissemination of these intervals are not clear. There is some general geological knowledge about these layers. In particular, it is worth mentioning that their average width is 0.5 m – 1 m, the average voidage is about 10% and they are located just below the Riphean interface at a depth around 2000 m. To assess the possibility of seismic techniques for imaging these objects we perform full scale numerical simulation of seismic waves’ propagation and generate synthetic multishot - multioffset data. The simulation was done by parallel software on the base of finite-difference technique with local grid refinement in time and space. Next, we use multicomponent Gaussian beams to construct scattered waves’ images of thin cavernous layers.
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The Main Guidelines of the Efficiency and Safety Increasing of Hydrocarbon Deposits Exploration and Development on the Arctic and Other Russian Offshore
Authors V.I. Bogoyavlensky, V. Yu. Kerimov, I.V. Bogoyavlensky and A.A. ShayhullinaSummaryThe article relates to the issues of efficiency and safety increasing in offshore oil and gas fields exploration and development. There are a lot of challenges for it on the shelf, including natural and technogenic subsoil degassing. The complex analysis of 4249 km of CDP seismic lines in the sea of Okhotsk revealed 218 potential gas pockets (shallow gas). Moreover three zones of possible gas hydrate distribution were detected by the presence of BSR boundaries. One of them is the first ever detected gas hydrate zone in the TINRO depression.
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How Much Do Fields in the Russian Shelf Cost amid the Crisis?
Authors O. Zhukov, S. Mammadov and Yu. P. AmpilovSummaryIn view of the unprecedented drop in prices for hydrocarbon in 2014, there is a growing opinion that in the new conditions where it is troublesome to recover the prices to the previous level, it is better to freeze the existing industry-specific programs and put the development of offshore fields on the back burner. It is mainly connected with the fact that the standard economic appraisal methods based upon discounted cash flows yield negative results. And how unprejudiced are these methods? Can such analysis be applied to such long-term and complex projects at all? All required parameters for such calculations are nowhere to find since there are no similar analogues and technologies for many of them either in Russia or in the world. If we take the official calculations in pre-crises prices of 2013 as our basis, it is hard to envision that such gigantic reserves of oil and gas truly have a significant negative assessment of dozens and hundreds of billiards of Rubles. In this paper, alternative methods of economic evaluation and the results of their application to individual bjects on the shelf of the Russian Arctic and the Far East are discussed.
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Hydrogeological Criteria for Forecasting the Oil and Gas Areas of the Siberian Platform
Authors A. Surnin and I. LitvinovaSummaryAn important component of the work on the forecast of oil and gas potential in understudied areas and a methodological tool for the oil and gas potential evaluation of the already prepared structures is the study of the hydrodynamic system of the section and a substantiating of the complex of oil and gas prospecting hydrogeological criteria. In modern terminology this means to construct a hydrodynamic/fluidodynamic/sedimentary basin model that allows to positional connection of hydrogeological factors of oil and gas potential with geological-tectonic and lithologic-facies features of the area within the selected sedimentary complex clearly.
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Approaches for Investigation of Oriented Cracks of Reservoirs Using Multicomponent VSP
Authors S.B. Gorskalev, N.A. Ashihmin, W.V. Karsten, D.M. Vishnevskiy and S.V. YaskevichSummaryThe paper presents the results of VSP data acquired in a model comprising azimuthally anisotropic layers. Using polarization analysis the displacement vectiors of quasi-shear waves were found and seismograms of these waves were obtained. Travel times of P and S waves were inverted to determine the orientation of cracks and elastib constants in the anisotropic layer considered
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Paleostructural Reconstructions of the Stratigraphic Horizons of the West Siberian Basin
Authors V.V. Shimanskiy, S.V. Shimanskiy, I.S. Niziaeva and A.A. GomonovSummaryThis paper provides examples of the use of different approaches to obtaining paleorelief and their influence on the result of paleogeographic reconstruction of West Siberian Sedimentary Basin. For this purpose authors examined different methods of paleogeographic reconstructions. Most simple method is subtracting the depth of the top and base of the examined horizons. However, its accuracy is too low for petroleum exploration purposes. For more reliable prediction of hydrocarbon lithological traps distribution we need to consider uneven compaction of the rocks during the formation of the sedimentary cover. The use of this method allowed authors to increase reliability of paleostructural reconstructions.
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