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Geomodel 2015 - 17th science and applied research conference on oil and gas geological exploration and development
- Conference date: September 07-10, 2015
- Location: Gelendzhik, Russia
- Published: 07 September 2015
81 - 100 of 189 results
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The Estimation of Accuracy of the OBN’s Positions Calculation
Authors E.G. Zhemchuzhnikov and D.A. PopovSummaryThe permissible minimum accuracy of OBN’s positions calculation is estimated by help of direct water wave’s first breaks (FB) from ordinary shots – based upon record parameters (sample rate – first of all) of reflection method.
The article contains the methods&soft of receiver positioning and list of record’s parameters, which are especially sensitive to receiver-coordinates errors by reflection method’s processing.
The position’s calculation criterion is formulated; relying on this the minimum necessary accuracy of OBN’s positions was estimated (Barents and Kara Seas shelf’s areas, typical records) – up to 8m.
The article contains the calculation’s method, man-hour and result’s accuracy.
The corrections necessity of “mirror” solutions by 2D seismic survey is considered expressly.
The basic conclusion: the seismic survey (reflection method) is all-sufficient instrument both for data acquisition and for bottom receiver’s positioning. Under this circumstance the purchase and use of hydro acoustic systems providing the seismic survey is not necessary.
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Seismic Recording Systems at the Fifth Technological Level of Land Seismic
More LessSummaryThe fifth technological level of land seismic (or HDSSSS) is characterized with utilization of mega crews with tens of thousands of channels in the recording spreads and high-productivity techniques. To efficiently use expensive field equipment and reduce the acquisition costs, it is necessary to ensure zero downtime acquisition. New hybrid architecture combining the advantages of cabled and cable-free recording systems has been developed to solve these tasks.
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The Particularities of 3D Seismic Data Processing for Compensation of Influence of Sedimentary Cover of Target Horizons
By V.D. KlykovaSummaryAs a result of the research the special technology of dynamic seismic data processing was formed to correct and compensate influence of sedimentary cover particularities towards target horizon amplitude.
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Application of Robust Surface-Consistent Deconvolution
Authors N.S. Zhuravko, Y.V. Laptev, O.O. Adamovich and A.O. TinakinSummaryThe analysis of seismic data requires in many cases (AVO studies for example) the preservation of true amplitudes. This precludes the use of any processing step that modifies seismic amplitudes in an irreproducible way. Amongst such processes the trace by trace deconvolution is notable and this is one reason why the surface consistent deconvolution has become the preferred method. Other reasons for its popularity are the more stable and thus superior operators that are derived from spectra that have passed the strong but realistic filter of the surface consistent decomposition. In practice non surface consistent noise like ground roll or sporadic noise bursts that is prevalent in most land data can impair the surface consistent deconvolution to the point of uselessness. Because of these problems the surface consistent deconvolution could be used with land data only in connection with elaborate trace editing or in a processing sequence that is not altogether true amplitude. The modified surface consistent deconvolution (Robust Deconvolution) apply a method of deconvolution that attacks mentioned problems: Robust Solver that gives unbiased results even in the presence of strong inconsistent noise and Robust Application that enables the computation of additional temporally limited operators that abate the noise.
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Azimuth-Based Classification of Surveying Systems
More LessSummaryWe propose a new azimuth-based classification of surveying systems. We also show techniques for analysis of surveying systems with regard to azimuthal processing. It is proven that underestimation of acquisition parameters results in inability to implement many approaches to processing and interpretation aimed at more detailed study and forecast of the real properties of the medium
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Marine Seismic Data Processing With Slanted Receivers Line
Authors M.A. Ryabinskiy and D.B. FinikovSummaryIn this report we discuss some questions about marine seismic data processing related on registration with slanted receivers’ line. This type of registration produces specific noise called ghost. To suppress the noise we suggest new algorithm based on kinematic filtering.
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Marine Data Processing Results Reliability Increasing
By B.S. EsinovSummaryIn conventional marine seismic surveys, the air-guns and streamer(s) are placed at certain predefined depths below the sea surface. The decision of source/receiver depths for any given survey is based on several conditions, including weather conditions, desired frequencies, equipment type etc. In addition to those, the location of the notch in the frequency spectrum created by the surface ghost reflections is something that must be considered. Ghosting is a direct result of placing the source and receivers near a sharp discontinuity, which is the water/air contact in marine acquisition. The result of deghosting procedure are images quality environment, increases the reliability of geological tasks. There is no need to focus on the positive effects of this procedure during the expansion of the spectrum to higher frequencies. In recent times, a growing interest is the low frequencies that increase the stability of seismic inversion and tying processing results to well data.
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3D Seismic Data Processing Technology for Near Surface Effects Compensation Using Surface Waves Frequency Dispersion Curves
Authors O.O. Adamovich and Y.V. LaptevSummarySeismic data processing nowadays meets new requirements during conventional 3D surveys. The key idea to meet these requirements is to use new seismic data processing approaches. One of the approaches is to use surface wave as a useful signal which is treated as noise in conventional seismic data processing. Surface waves travel along free surface and carry information about near surface properties which are expressed mainly in frequency dispersion. Surface waves area dispersion study may allow us to build detailed near surface velocity model. Joint surface and refraction waves velocity model may be built and further used for statics calculation and prestack depth migration. Another possible application of built velocity model may be direct linear waves modeling and consequent subtraction. This approach may help to preserve reflected waves signal especially at low frequencies and near offsets which can improve further low frequency inversion response and AVO-behavior
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Technology Features Wide-Azimuth Seismic Data Processing on Example Jurassic-Cretaceous Deposits of Western Siberia
Authors R.Y. Boyarkin, I.N. Kerusov, L.A. Popova, A.A. Barantcev and A.N. InozemtcevSummaryThe presented results can more accurately allocate basic contours of promising oil and gas traps, more reliably assess areas of increased fracture density and orientation, as well as improved distribution of reservoir properties of layers investigated.
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Applying Full-Azimuth Seismic Surveys for Details of the Terrigenous and Carbonate Reservoirs at One Oil Field in Eastern Siberia
Authors A.S. Sorokin, A.N. Inozemtsev and E.V. LubimovSummaryNarrow-azimuth seismic survey technology to limit the possibility of full illumination of depth objects and detail tectonically screened hydrocarbon reservoir in Eastern Siberia.
Full-azimuth seismic surveys are a tool that removes these limitations and opens the way for full-azimuth study depth subsurface objects geology and detailed study of geological objects. For more accurate detection of potential reservoirs of hydrocarbons, as well as to reduce the risk for drilling exploration wells on one of the areas of Eastern Siberia technology was used full-azimuth seismic studies, including field survey, time and depth processing as well as synchronous seismic inversion.
A new results will accurately identify the contours of the perspective targets, to improve the reliability assessment of zones of high fracture density and their orientation in terrigenous and carbonate reservoirs, to make principal clarifications at the drilling locations for this oil field
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Method for Resolving the Ifluence of Near Surface Heterogeneities During Velocity Depth Model Building
Authors E.L. Svistova, B.S. Esinov, I.Y. Radionov and A.E. KorolevSummaryTrue depth imaging is one of the main problems of seismic processing and, first of all, depends on the high-quality depth velocity model. There are many different methods of depth velocity model building. The model itself, and, therefore, the result of migration highly depends on the methods of resolving the influence of complex near surface overburden. The underestimation of the subsurface influence leads to a distortion of seismic data over the whole section. However, the application of large statics shifts to the data, which solve the static problems in time, leads to distortion of seismic velocities and, consequently, to difficulties in the depth velocity model building. In this paper, we suggest a method for resolving the complex near surface overburden at the stage of building the depth velocity model using seismic refraction waves.
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Influence of Local Velocity Heterogeneities on the Seismic Wave Field and Their Integration into the Depth - Velocity Model
Authors E. Rossiyskaya, A.E. Korolev and E. A. FomichevaSummaryReal geological media generally have a complex structure and heterogeneous compound. The presence of local heterogeneities in the overburden leads to a distortion of the effective parameters of the waves reflected from underlying horizons. In the present work, we explore the influence of low-speed local heterogeneities in the upper part of the medium, associated with gas pockets, on an example of 3D marine seismic data and the method of accounting for them by constructing a detailed depth velocity model based on global seismic tomography
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Full-Azimuth Seismic Data Processing to Study Anisotropic Properties in the Timano-Pechora Region
Authors O.O. Litvyakova, E.M. Voronovicheva, A.E. Korolev and S.N. PtetsovSummaryFull-azimuth common reflection angle domain migration was performed with VTI anisotropic velocity model. These results were used to study the anisotropic properties and to determinate HTI- parameters. Also main types of diffracted waves were determinated and separated on the basis of their azimuthal features
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Nonlinearity of Geological Environment in Case of Broadband Impact. Signal Spectrum Enhancement to Higher Frequencies
More LessSummaryAuthor of this paperwork introduces an example of nonlinear effects analysis technology application (prototype) in case of useful signal spectrum enhancement to higher frequencies. Broadband impact on the geological environment event described. This paperwork is about continued explorations of nonlinear wave field properties
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Advantages of the PSR-method for Eastern Siberia Seismic Data Processing (Yakutia)
Authors V.V. Kondrashkov and A.Y. GlagolevSummaryIt is kwown there are many difficulties and unsolved problems in the East Siberia data processing. In this paper it is recommended to use the PSR (Parametric Sweeping of Reflections) method to obtain a positive results of data processing in such conditions.
Rugged area, high-velocity section, absence of low-velocity layer, presence of traps are factors that don’t allow to calculate usual statics because the result depends on angle of emergence. Authors suggest to use post-critical reflections and refracted waves as a solution to these problems.
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Aspects of Petrophysical Justification of Volumetric Parameters of Turonian Productive Reservoirs in Western Siberia
Authors A. Teploukhov and A. MalshakovSummaryThe Turonian productive reservoirs are appear to benon-traditional item analysis for oil and gas geology and refer for hard to recover reserves hydrocarbon. Nowadays we have a tendency of intent geological researching productive reservoirs of this age and because of that problem of estimation volumetric parameters has a big relevance and urgency. Productive reservoirs which are concentrated there cannot be efficiently estimated with using traditional methods that’s why creation a new individual approachare demanded for the Turonian reservoirs.
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Determination of Reservoir Properties with Control of Saturation by Method of NMR
Authors E.V. Borisova, K.O. Vyatkina, V.N. Gileva, R.S. Shulga and I.S. ShakhmatovSummaryIn this work we marked one of the approaches to the determination of reservoir properties with control of saturation by method of NMR on the example of one well:
On the basis of the material composition has been determined four major lithological types of rocks of Bazhenov Formation: 1. Pyritized argillite 2. Phosphate rock 3. Limestone fine-crystalline 4. Clay-siliceous rocks. For holding reseach we selected two cores from the same place. One of them was used for determining the residual water by method of Dean-Stark, the second was researched by methods of NMR and gas saturation.
As a result, we have the following conclusions:
- From the viewpoint of elaboration lithological types of 2 and 4 are more interesting because they can store and transport fluid.
- Lithological type 4 is the most interesting for us because it is capable to store fluid, but its capacity of transporting is unknown according the results of method of NMR volume of mobility of fluid is small
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Increase the Efficiency of the Forecast of Oil and Gas TRAPS Tight Oil (Hadumskaya Suite Ciscaucasia)
Authors L.V. Lyukshina, G.Y. Shilov, R.N. Mustaev and K.Y. OdintsovaSummaryOil tight oil (Hadumskaya Suite Ciscaucasia) is a serious object of future production using new technologies. Hadumskaya Suite dedicated to the Maikop series sediments (early-middle Oligocene), represented by dark-grey and brown clays with interbeds of marls. In many cases, hydrocarbon deposits are associated with fractured schistose strata.
Hadumskaya Suite on lithological grounds divided into 3 horizons: the lower – przejscie, medium – olbinski (ostectomy layer), the upper horizon of Maraskino beams. Geochemical studies of sediments of the Oligocene showed that they were deposited in a reducing atmosphere. Organic matter presents fine sapropel formations of nature and, to a lesser extent, inclusions humus-lignite material. The content Sorgue decreases with increasing carbonate rocks. On the assessment of the petroleum generation potential of large capacity to generate hydrocarbons from sapropelic-humic and humic-sapropelic type of organic matter Oligocene rocks. It is characteristic geilweilerhof (pore) pressure. Our research on the evaluation of pore pressure gradients in HS, it was found that in those intervals where gadomski retinue gradients of pore pressure was normal, there was formed deposits of oil. Here clay rocks Hadumskaya Suite sealed, as it does not contain abnormally high pore pressures. As a consequence, in the interval of occurrence Hadumskaya clay rocks could crack, leading to the formation of cholesterol fractured reservoirs and subsequent to the formation of deposits
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Generation and Conditions Formation of Hydrocarbon Deposits in Kyulong Basin by Simulation Results Hydrocarbon Systems
Authors R.N. Mustaev, W.N. Hai, V.Y. Kerimov and E.A. LeonovaSummaryIn order to assess oil and gas potential has created a model of generation and accumulation of hydrocarbon-systems using program petromod.
According to the research within Kyulong basin complex are two oil source: Oligocene and the Lower Miocene.
The simulation models are built 3D density distribution of hydrocarbon migration from source rocks of the upper and lower Oligocene Kyulong basin.
It was determined that the total amount of hydrocarbons released from the Upper Oligocene source rocks are now slightly different from the volume of 11 million years ago
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The Influence of Lunar and Tidal Forces on the Gas Composition of Subsoil Geosphere
Authors O.K. Navrotsky, A. N. Zotov, A.M. Dotsenko and M.B. BogdanovSummaryThe gas composition research of subsoil geosphere (methane and its homologues, nitrogen, oxygen, helium and hydrogen) was conducted under the influence of lunar and tidal forces. The measurements were taken in a specially equipped and cased well (depth 2.5m). Gas was extracted by a vacuum pump from this well at the spring tides from May, 2014 to December, 2014.
As a result, it should be said that the interpretation approach of gasometric surveying in petroleum exploration should be adjusted essentially.
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