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1st EAGE International Geosciences Conference on Kazakhstan
- Conference date: 15 Nov 2010 - 17 Nov 2010
- Location: Almaty, Kazakhstan
- ISBN: 978-90-73781-94-8
- Published: 15 November 2010
50 results
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Classifying of East Kazakhstan Sedimentary Basins and their Oil and Gas Potential
Authors T.K. Paragulgov and K.K. ParagulgovKazakhstan area is divided into two oil and gas geological regions - West Kazakhstan and East Kazakhstan respectively. Basing on the performed analysis of East Kazakhstan area evolution, the positioning of sedimentary basins within East Kazakhstan area has been done. Comprehensive analysis of previously acquired and new geological and geophysical data has been able to create the new geological models of East Kazakhstan sedimentary basins and generate the new exploration conception. East Kazakhstan sedimentary basins have been classified into three types: intraplatform, intracontinental and intrafolded. Intracontinental basins are referred to two subtypes related to the areas of stable and nonstable Caledonian consolidation. Intrafolded basins are subvidided into foredeep and intermountain ones. The suggested "three-staging" of sedimentary succession of the basins is allowed to have a new look onto the oil and gas potential of East Kazakhstan area and new hydrocarbon resources estimate has been performed. The further serious study of relatively unexplored but highly prospective basins is recommended.
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Evaporite Deposits in Central Asian Pricaspian and Amu Darya Basins - Stratigraphy, Salt Tectonics and the Potential as Petroleum Seal
More LessSubstantial volumes of evaporites are present in sedimentary basins in Central Asia, such as Pricaspian and Amu-Darya basin. Pricaspian evaporite sequence deposited in Permian-Kungurian age with significant diapiric features. The evaporite deposits in Amu-Darya basin is younger, deposited in Upper Jurassic, with very little diapiric features. Both evaporite deposits play significant role as primary seal in these basins, however later tectonics could trigger faults which bridge these evaporite deposits.
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Application of Gravity Gradiometry in Salt Basin Modelling
Authors M.A. Davies and J. MartinThis paper demonstrates the use of Full Tensor Gravity Gradient Imaging (GGI) as an exploration tool within a salt basin province. In May 2010 Gravity Gradient data was acquired over 9000 km2 of the Gabon Atlantic Margin to; (1) compare and contrast GGI with ‘conventional’ gravity observations, (2) better image carbonate / salt structures, (3) demonstrate the ability of GGI to image structures in ultra deepwater and (4), demonstrate the shelf life of a GGI dataset by incorporating the data into a joint Seismic Velocity Modelling workflow, thus providing a better image of the subsalt structure. This paper will report on the outcome of the study and draw parallels between the Gabon dataset and areas in Kazakhstan where GGI would aid salt basin modelling. This will be done using a GGI feasibility study approach, where the 3D input model is based on seismic data acquired by CGGV over the Northern Caspian area.
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Structure and Petroleum Habitat of the Uralian Foreland Thrust Belt
By K. SobornovInterpretation of oil industry seismic data acquired across the foreland of the Ural fold belt provides new constraints on this fold belt in two aspects. Firstly, it has permitted a better understanding of the architecture of the fold belt revealing considerable along strike structural changes. Lateral structural segmentation is interpreted as being controlled largely by the long-lasting interaction of the inhomogeneous Uralian margin of the East European and Siberian plates and the Altaid collage situated between them. Secondly, these data document the timing of tectonic events which have taken place throughout much of the Phanerozoic. This provides vital links between the development of the Uralian foreland and hinterland.
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Evolution Late Devonian-Carboniferous Formation of Reefs in Kazakhstan
More LessIt is detailed Famenian - Early Bashkirian a cycle formation of reefs, evolution formation of reefs in Famenian- Carboniferoius in Kazakhstan is presented, age levels are allocated some and the structure builders of reefs organisms is specified.
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Depth Physical Models of South Torgai Basin
Authors A.T. Urdabaev and R.K. AtuovGeophysical data combination techniques, based on seismic-electrical time sections imaging, were considered. Further gradual imaging of density and magnetic sections provides compliance of physical models structure. Best-fit physical models form basis for imaging geological and geophysical depth section, which characterize geodynamic model of crust in a most adequate way from the level of exploratory depths to the Moho.
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Experience of Constructing and Applying of Petrophysical Inversion Algorithms and their Parameters Adjustment
By B.N. EnikeevExisting systems intended for interpretation of petrophysical data can be divided into ‘quick-look’ and ‘indepth’ systems. The principal advantage of all latter ones is a built-in module (in various realizations) that allows performing petrophysical inversion – a major achievement of modern data interpretation. Another line of development of petrophysical interpretation – various ways of logging methods internormalization – is of not less importance. This approach was first proposed by Wyllie and Zalyaev. Its necessity is stipulated by information concerning petrophysical interrelationships, which is in most cases statistically not-reliable or incomplete. In this report an issue of synergy of both these lines is reviewed and results of its implementation are given.
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MPLT Flow Zone Summary 1997-2009 for Karachaganak Field, Kazakhstan
Authors J. Russo, K. Yebzhassarova, L. Kunakbayeva, N. Pangereyeva and S. ChittickMemory production logging tools (MPLT) have been run in the Karachaganak Field since 1997. Measurements such as spinner, temperature, density and pressure are run (on wireline or slick-line) to identify zones of hydrocarbons entering the wellbore. Flow rates are derived from these measurements across individual flow intervals and can be converted to % contribution of the total accumulated flow. Therefore, adding up all the % contributions for each flow zone from a MPLT Run will total 100%.
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Practical Comparison of Forecasting Technology Fracture Zones in Oil Fields by Seismic Data
Authors A. Iakovlev, I.U. Khromova and B.H. LinkThis paper describes examples of mapping fracture zones in carbonate reservoirs using duplex wave migration (DWM). This method is used following conventional pre-stack depth migration with a new and very different type of pre-stack depth migration called DWM plus interpretation. The theoretical basis of the DWM process enables its ability to provide accurate and detailed detection of the position and properties of vertical boundaries and of the fracture zones confined by them. Fracture zones revealed using the DWM process are compared with available well information that verifies the existence or absence of anomalous permeability, its direction, and most importantly, information about the intensity of open fracturing in productive wells. The locations of open fracturing are verified by the productivity factors and interconnection of these wells. Also, the DWM results are compared with the results of standard methods for seismic data interpretation, which are widely used for mapping of small-scale faults and fracture zones.
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Multiple Well Paleocurrent Direction Analysis from Borehole Image
More Less1.The accurate structural dip could be calculated with this improved workflow including in complex structure and no reliable bed boundary dip interval. 2.The integrated workflow for Paleocurrent direction analysis is suitable for single well and multiple wells by combine structural dip and structural axis removal.
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Integration of Borehole Image Log and Formation Pressure Sampling to Determine Reservoir Barrier in a Tight Carbonate
Authors J. Russo, S.C. Chittick and A.B. El BattawyA complex diagenesis over carbonate rocks extends from syndepositional to deep burial settings at Karachaganak field. The complexity of carbonate reservoirs are well known due the nature of their heterogeneity and cannot be resolved by conventional openhole logs because of limited vertical resolution and large azimuthal dependency. Borehole image logs provide both the small-scale resolution and azimuthal coverage to quantitatively resolve the heterogeneous nature and are used routinely to determine subseismic structural or stratigraphic events, as well as to optimize the selection of formation pressure and sampling points. Analysis of pressure gradients from good pressure sampling points can confirm subseismic reservoir barriers which had been earlier interpreted as a structural or stratigraphic break. Two case studies from nearby vertical wells A and B are described. A field-wide unconformity surface picked in both wells separates between Carboniferous and Permian formations. It is indicated by the drag pattern of the dips and a shift of pressure gradient. The carboniferous section in well A is composed of numerous shoaling upward cycles. Any of these cycle tops can act as a vertical permeability barrier and result in a step in the pressure profile.
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From AVO Screening to an Advanced Pre-stack Reservoir Characterization through a Detailed Rock Physics Analysis
By Y. BalabekovThere are two prospective technologies that can maximize petroleum operator’s business impact described in this paper. One of them is AVO screening - ProspectScanner technology which combines seismic AVO analysis and inversion technology to derive relative elastic properties (i.e. P and S-wave impedances, Vp/ Vs ratio). This workflow is time-efficient and allows for the inversion of large seismic volumes, making it an excellent regional litho/fluid screening tool which works without well data. Whereas the next stage follows as an independent method where a calibration of reflectivity data to well logs and deriving of regional rock property trends enable expected reflectivity to be calculated. Expected reflectivity is than compared with observed reflectivity which leads to prediction of lithology and fluid content.
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Injection/ Fall-off Well Testing – Improvements in Test Design, Interpretation and Integration for Fractured Carbonate Reservoir Characterization and Petrophysical Log Evaluation
Authors N. Janusic and FIDEL IbragimovDemand to replace conventional test with flaring to surface with zero emission test is becoming increasingly important in the light of environmental protection and CO2 emission reduction. Furthermore, flaring permits are getting more and more difficult to obtain, and are going to be completely banned very soon. In this work we will demonstrate how injection/fall-off test could be improved in terms of execution by tailoring to specific test objectives as well as in interpretation and integration. To improve permeability and skin allocation among layers in a coherent and robust interplay, several methods have been investigated and improved testing procedure and test interpretation and integration in terms of maximizing the Value of Information have been proposed. With improvements in injection well testing procedure and advanced interpretation and integration, injection tests could become the tests for the 21st century, where emission of greenhouse and toxic gasses will be drastically reduced or not permitted at all.
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Technology of Suppression Sea Bottom Multiples at the Caspian Sea Offshore Zone
Authors A. Iakovlev, P.G. Stewart, S.V. Gorbachev and V.P. GazaryanResults of sea bottom multiples suppression methods application at the Caspian Sea offshore zone presented herewith. It was demonstrated that application of multicomponent sea bottom receivers enables steadily application of sea bottom multiples the suppression by PZ-stacking method, especially essential at the near offset, where it is complicated to select primary reflected waves from multiples by travel-time characteristics. Application of SRME and high resolution Radon at the following stages of processing enables effectively suppress partly ringing interfering waves. However the key objection in overall application of multi-component sea bottom receivers is the cost of those works. One of the ways to eliminate seismic survey expenses is to use detached sea bottom receivers instead of OBC. Herewith demonstrated comparative evaluation of application different systems and methods of offshore seismic surveys and estimated feasibility efficiency of application 4-components nodes.
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Objective-oriented Imaging on the Base of Focusing Transformation
Authors V.A. Pozdnyakov, V.A. Cheverda and S.S. KhudyakovEast Siberia is one of the very promising areas for oil and gas explorations, but recovery and development of new deposits face essential troubles due to extremely complicated geological environment. For the first of all these troubles are connected with low self-descriptiveness of images computed with the help of regular migration procedures, both post- and prestack. In order to improve their quality and to increase resolving ability we propose and develop so called object-oriented technology of seismic processing. Its main advantage is ability to handle together reflected and scattered/diffracted waves both individually and in combination. This provides detailed knowledge of different features of the target geological objects – reflected waves describe their regular constituents (interfaces), while scattered/diffracted ones are responsible for fine properties like distribution of cracks/fractures/cavities.
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Some Peculiarities of Seismic Waves Propagation in Anisotropic Media, Results of Numerical Simulation
Authors D. Vishnevskiy and V. LisitsaWe presented Lebedev scheme for numerical simulation of seismic wave propagation in 3D anisotropic elastic media. The scheme is more efficient and powerful than the alternative RSGS approach. Lebedev scheme was used to simulate wave propagation in a model containing a TTI layer. It was shown that TTI causes S-wave splitting, amplitude variation with offset separation the pairs of reflections of the type PSPP, PPSP and PSPS, PPSS. The first two effects present even in case of VTI layer but the last one can be used as an indicator of anisotropy of more general type than VTI.
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Asymptotic Inversion of Seismic Data Based on Gaussain Beams
Authors M.I. Protasov and V.A. TcheverdaThe paper is devoted to recovery of local rapid perturbations (scatterers/reflectors) of a priori known macrovelocity background by means of linearized asymptotic inversion of multi-shot multi-offset seismic data. Inversion procedure is done via application of some speci£c integral transform to input data with respect to source/receiver positions and time frequency. Result of this transform is represented as an asymptotic series with leading term being superposition of some specific spatial Fourier constituents of desired local perturbations. Composition of these constituents is totally determined by range of time frequencies and geometry of acquisition system. The approach is tested on Sigsbee2A synthetic data set. Numerical results are presented and discussed.
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From PZ Sum to Wavefield Separation, Mirror Imaging and Up Down Deconvolution: the Evolution of OBS Data Processing
By S. Grion LtdThis paper discusses present trends in ocean-bottom seismic (OBS) data processing. Current practices for industrial P-wave processing are described, discussed and exemplified using synthetic and real data examples. The discussion highlights the evolution of processing techniques from inception to present time. Initially, specialized OBS processing aimed at the attenuation of water layer reverberations only. Later on, processing progressed towards a more complete wavefield separation approach and new applications emerged, such as more sophisticated P (pressure) and Z (vertical component) calibration, up-down deconvolution, and mirror imaging. The transition of these applications to standard practice is still ongoing but progressing rapidly, backed by theoretical correctness and the quality of practical results on field data.
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Generation of Scattered Waves by Cavernous/Fractured Reservoirs
Authors V.A. Cheverda, V.V. Lisitsa, G.V. Reshetova and V.A. PozdniakovIn order to simulate interaction of seismic waves with cavernous/fractured reservoirs the finite-difference technique based on locally refined in time and space grids is used. The need to use these grids is due to essentially different scales of heterogeneities in the reference medium and in the reservoir. Parallel computations are organized on the base of 3D Domain Decomposition into elementary subdomains in the both reference medium (coarse grid) and reservoir (fine grid). Each elementary subdomain is assigned to its specific Processor Unit forming two groups – for reference medium and for reservoir. The data exchange between PU within the same group is performed in a standard manner – by nonblocking iSend/iReceive commands. The data exchange between two groups is done simultaneously with coupling of coarse and fine grids and is controlled by specially designated master PU. Results of numerical simulation for a realistic model of the carbonate reservoir are presented and discussed.
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3D Wide Azimuth Land Processing in the U.A.E. - A Middle East Case History
Authors A. Svetlichny, K.W. Mueller, M. Samir Al Nahhas, W.L. Soroka, M. Al Baloushi, R. Sinno, R.D. Martinez, P. LeCocq and W. HusseinAzimuthal anisotropy from a 3D land seismic dataset acquired in the U.A.E. has been analyzed using wide azimuth processing. Different processing methods and flows were tested to arrive at optimum processed azimuthal volumes. Azimuth sectors both parallel and perpendicular to the three major fault system orientations, were imaged separately to produce the six final azimuth volumes. Comparisons between the different azimuth sectors were used to detect azimuthal differences in velocities and amplitudes that could be correlated with fault and fracture orientation and magnitude. Preliminary analysis of pre-stack and post stack data shows subtle azimuthal velocity differences in these carbonate rocks, which are difficult to attribute to fractures. The difficulty in quantifying velocity differences could be due to an offset limitation in the cross-line direction. Other azimuthal attributes, such as amplitude extractions along horizons above and within the reservoir area are show amplitude signatures that could be related to fracture corridors in the reservoir.
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Efficient Technology for Searching Oil and Gas
Authors I.F. Myasnikov, A.M. Ogurtscov and V.V. UginРассматривается новая технология поисков УВ, включающая геохимические методы поисков и дистанционную термометрию. Приводятся примеры решения задач на различных стадиях геологоразведочного процесса, от стадии региональных до разведочных работ. A new search technology, with geochemical methods of prospecting and remote thermometry is considered hydrocarbons. There are some examples of solving problems at different stages of the exploration process.
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Advances in Modeling of Passive Inflow Control Devices Help Optimizing Horizontal Well Completions
Authors A. Galimzyanov, L Ostrowski and E.B. UelkerTo evaluate performance and potential benefits of a PICD completion, a full-field simulation model is required. Simple near-wellbore simulators are often used to initially evaluate the applicability of the PICDbased completion. However, only full-field reservoir simulation can provide prediction for the completion/ reservoir performance and thus allow for a full evaluation of the economics and feasibility of the project. A multi-segment well model can be used to represent the PICDs in the horizontal well. The multi-segment well model is an advanced well modeling that allows accurate modeling of multi-phase flow and pressure variations in wells with a reservoir simulation model.
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The New Technology of Forecasting Mineral Deposits Based on Remote Sensing
Authors B.S. Zeilik and D.R. KadyrovAccording to remote sensing revealed impact large circular structures that accompany the concentric zones of tension and compression. The existence of the earth's crust concentric tension-softening and compression in cosmogenic explosive ring structures and in their framing is confirmed by long-term research carried out at the Semipalatinsk test site in explosions of nuclear weapons. A common feature of the results is firmly established cycle of alternating zones of compression and softening in the rock mass around points of explosions. Found that a zone stretching in the crust, accompanying cosmogenic ring structures, control the spatial distribution of the overwhelming mass of mineral deposits, as the hydrocarbon and solid mineral resources throughout the vast territory of Kazakhstan. Forecast promising areas to search for mineral deposits, based on identified patterns, supported by powerful statistical sampling, the result of years of geological exploration. The proposed new technology prediction of mineral deposits can extensive use of advanced space information for the full improvement of the search exploration for oil and gas in all sedimentary basins of the World, as well as search prospecting for solid minerals in all regions of the world.
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Innovative High Resolution View of the Prospects of Electrical Hydrocarbons in the Crystalline Basement
By V.V. ChernovOil and gas deposits can be found not only in a sedimentary formation, but also in a crystalline basement. Prospecting such reservoirs is the main perspective for increasing onshore oil and gas resources both in Russia and worldwide. Geoneftegaz Joint-Stock Company carried out exploration works in the Trans- Urals aimed at finding a deposit in a crystalline basement. The analysis of geoelectric parameters obtained on the basis of the high-resolution IP-prospecting data inversion showed that formations lying at bigdepths exceeding 2.5 km which correspond to igneous rock are most prospective in the Trans-Urals area. The greatest perspectives are geared to the island arc called, in Trans-Urals and North Kazakhstan, the Valeriyanovskaya suture which stretches through the Ural Mountains in the vicinity of the town of Pechora. The innovation is that of island arcs in the land of hydrocarbon still nobody acted in the world. The methods of electrical prospecting with high resolution allowed to see the prospects, but for the implementation of intelligence necessary cooperation of many specialists. We need help and we propose to draw attention to similar areas in northern Kazakhstan, where the work performed by specialists Kazakhstan Geology.
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Selective Hard Scale Removal from Perforation Tunnels
Authors R.M.M. Vegliante, P. Choudhary, A.M. Al Busaidy and Z. ZaoualiThis paper will describe the innovative methodology to apply dynamic under-balance to selectively remove hard scale from perforation tunnels. It has a number of advantages over traditional chemical or mechanical methods, namely a) Selectiveness b) It can be deployed by wire-line (no rig or CT. c) No production down time due to well shut-in. A wealth of objective measurements was made, including. 1. Three phase production logging measurements before and after the treatment. 2. Three phase surface measurement of produced fluid before and after the treatment. 3. High speed pressure gauge data, during dynamic under-balance event 4. Analysis of formation debris captured in the dynamic under-balance chamber. Wells Production histories give further insight into the effectiveness of the technique. The results exceeded expectations, with PI to the oil increasing up to 2.7 times and corresponding reduction (up to 50%) in WC. Samples retrieved from the dynamic under-balance chambers show to contain Barium and Strontium sulfite scale. The technique could herald a revolution in scale removal and showed to have unexpected potential in new and old wells improving (sometimes dramatically) perforation tunnel performances even where scale deposition doesn’t occur.
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The Use of Seismic Data Interpretation Systems in Technology of Gravimetrical Support of Seismic Survey in Caspian Basin
In RSE SGE a new method of 3D Gravimetrical modeling of salt layer in PreCaspian basin is developed. It is based on the gravity field interpretation involving seismic data. The use of such models in the process of interpretation of seismic sections allows obtaining more reliable data of salt layer structure. Converting data from gravimetrical system (SPOGM) formats to SEG-Y formats allows manipulating gravity survey data in a seismic data interpretation systems environment such as PETREL (Schlumberger), KINGDOM (SMT). As a result there is an increase of production and technological effectiveness of combined analyses of seismic and gravity surveys.
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The Prospects of Studying and Forecasting of Subcornice Oil Deposits in Eastern Board of the Pre-Caspian Depression
By N.G. DavydovThe basic maintenance The researches of the complex of geology-geological data were carried out under typical geological objects and in the aspect of studying of features of structurally-tectonical, lithology-facial allocation, parametres of PCP (physics-capacity properties), a quantitative estimation of revealed subcornice deposits and it’s forecasting on extensive territory of Eastern board of the Pre-Caspian depression(Figure 1). In these researches were used the materials of high-definition MOGT 2d/3D seismic, high-precision gravity prospecting, and other methodical methods and technologies. An unique geology-seismic data were recieved and proved with drilling work, which show the high efficiency of the practical solution of problems of revealing of subcornice deposits (Figure 2). The conclusions: As the result of researches was the creation of forecast map of a zone of arrangement of expected subcornice deposits, which frames the whole Eastern board of the Pre-Caspian depression (Figure 3) with a various stage of reliability of the further detailed elaboration. The geology-methodical, geophysical and drillings recommendation regarding to introduction in the total balance of hydrocarbons of huge territory of Pre-Caspian bassin are also provided.
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Dynamo Effect of the Earth and the Formation of Oil
Authors G.V. Tarasenko and G.V. TarasenkoSubduction regime formation of oil associated with the absorption of the oceanic crust into the mantle at a depth of more than 1000 km. At this depth, the temperature should not exceed 1000 С, at which organic matter preserved in rocks, will burn. But oil, on palynological analysis, the dispute remains and pollen (Medvedeva, Vinogradova, 1977) which burns at temperatures up to 600 C. Experiments to obtain oil, conducted at high temperatures (pyrolysis) does not result in a natural oil, but to obtain oil by electric discharge in a solution of water with soda ash had led to oil, coal and diamond chips. Here, obviously the process of cold nuclear fusion, which proves the occurrence of such processes in the crust. Further studies should confirm the CNS in the earth's crust.
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On the Application of Physical and Geological Modeling for the Interpretation of Geophysical Data
Authors A.N. Orekhov and L.Y. ErofeevAn approach of the authors and justified the creation of physical-geological models of ore objects. The example of adapting an existing model to the conditions of a particular object. The estimation of Setting up physical-geological models in the study of geophysical methods of ore deposits of different genesis.
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Kyzyl Gold Project - Renaissance of a Kazakhstan Gold Producer
By I. BlakleyAltynalmas Gold Ltd is an emerging Kazakh and Canadian gold company. Altynalmas’s main focus is on the Kyzyl Shear zone which includes the Bakyrchik and Bolshevik Gold deposits. The Kyzyl gold deposits consist of a series of mineralized lenses or lodes lying within a large shear zone, which is 11.5 km in length. Gold mineralization is hosted within sheared carbonaceous sediments of the fault zones, and is principally contained within sulphide mineralization occurring in association with quartz stockworks, which crosscuts and parallels the foliation of the sediments. Mineralogical studies indicate that the majority of the gold is encapsulated by arsenopyrite and, to a lesser extent, pyrite. The deposits are "double-refractory" in nature. Recent etallurgical testwork using fluidized bed roasting have resulted in recoveries between 86 to 90%. Altynalmas recently release a Pre-Feasibility Study and is currently undertaking a Feasibility Study. An initial 75,000 m diamond drill program will be completed in November 2010.
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Metasomatic zonation of large gold deposits in Kygyzstan
By N. PakРассматриваются крупные месторождения золота в Кыргызстане. Они характеризуются широким развитием различных метасоматических пород. Метасоматиты имеют многостадийное развитие и образуют последовательные ряды, которые выражаются в вертикальной и латеральной зональности. Приводятся характеристики золотой и пиритовой минерализации.
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New Experience of Radiowave Tomography Application for Prospecting Karst Cavities
By N. KuznetsovВ докладе рассматривается практический результат выделения карстовых областей в межскважинном пространстве по данным радиоволновых исследований межскважинного пространства на примере рудника Шаймерден. На представленном разрезе указаны преимущества использования метода: выделение контрастных по электрическим свойствам областей, а также решение общих структурных и морфологических задач.
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An Assesment of "Hydraulic Jump" in Hydrogeological Boreholes During The Pumping
Authors V. Salybekova and V.A. ZavaleyThe main purpose of study is to define the phenomenon of "hydraulic jump" level and determine what extent it affects the values during pumping from boreholes. Consideration the flow of water to boreholes and the "hydraulic jump" formation indicates that the phenomenon can cause significant error at calculation hydrogeological parameters in the boreholes during pumping. This work reflects the reasons for formation of "hydraulic jump" and the methods of its determination. Calculation of "hydraulic jump" level in wells producing real value in determining the filtration coefficient in the wells and reduces the error in determining it to 98%.
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Karachaganak 2009 3D Seismic Survey - A World Class Effort
Authors M.H. Eales, T. Daley, M. Morosini, M. Sharafudinova, T. Marples and K.S. LeeThe Pre‐Caspian Basin of western Kazakhstan is the location of several world class hydrocarbon fields, including the onshore Karachaganak Field. However its geological setting is very challenging for the seismic technique: deep carbonate platform targets beneath a complex overburden including diapiric and detached salt structures and high dips of intervening and subsalt strata. Furthermore, the abundant oilfield infrastructure generates a noisy environment for seismic acquisition and reduced access for Vibroseis trucks.
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Seismic Processes in Mining Regions - Case Studies for the Salt Deposits in Starobin (Belarus) and Provdja (Bulgaria)
Authors I.Z. Paskaleva and A. AronovSeismic processes in the regions of the Provadia and Soligorsk potassium salt deposits have shown three features: a) an identity of the recurrence curves of the seismic events of the energy range of 10E+6 ÷ 10E+10J; b) a quasi-periodic character of the seismicity activation in time against the general trend of seismicity activation increasing; c) the zones of epicenters of seismic events are larger than mining areas.In both deposits epicentral areas of seismic events overstep the limits of mine workings.
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Tectonosphere Model of the Southern Pribalkhashye Region, Kazakhstan, Along the Lines of Regional Seismic Profiles
Authors S.A. Istekova, R.A. Mussayev and A.A. BaydauletovaAn analysis of the velocity profiles combined with geological, magnetotelluric and gravimetric data were used to create model of tectonosphere of the Southern Pribalkhashye region. The structures formed on the ocean ( Shu-Ili, Kenterlau-Matayskaya and Irtysh-Zaisan zone) and continental crust (Precambrian complex of Aktau-Zhongarskogo terrane and Koyandinsko-Arkalyk block) were determined.
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Chimney Study as a Practical Tool in Hydrocarbon Exploration for Risky Prospects: A Case Study from Persian Gulf
Authors S. Sepahvand and H. RameshChimney detection is a technique which can be used as an exploration tool that provides important information for prospect evaluation and charged or non-charged prospects identification.The method applies multi trace seismic attributes, neural network modeling and the interpreter's insight.The approach shows how a fault can separate a reservoir in two parts with different hydrocarbon bearing behaviors.The results indicate in effect of fault sealing characteristic, The whole of reservoir horizons are not gas bearing and fault has divided it in two parts and acted as a seal and barrier between them
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Regional Assessment of Gross Depositional Environment for the Lower Cretaceous Play, North Caspian
Authors P.J. Lyon, K. Ruckwied, A. Droujinina and A. RoviraThe Berriasian – Hauterivian (Neocomian) sequence was deposited in an overall fluvio-marine environment. Significant paleo-relief existed at this time indicated by onlap of this unit onto partially eroded Jurassic carbonates. A lowstand period is identified in the Valanginian (Early Neocomian) which is associated with clear evidence of extensive channel development across much of the area. This interval is associated with distinct fining upward fluvial/estuarine channel sands recognized on log data and a corresponding increase in the proportion of non-marine palynomorphs identified in biostratigraphic samples. By the Late Barremian, most of the paleo-highs were submerged under a vast epeiric sea that extended across the region. Extensive shale units were deposited across the entire region. In the Aptian-Albian a large delta system prograded out into the presently offshore part of the North Caspian. Individual delta lobes can be tied and calibrated to log data which is characterized by classic coarsening upward para-sequences typically with high net/gross. A corresponding delta-top environment is recognized in the more proximal wells to the east with a distinctly higher proportion of non-marine palynomorphs consistent with a more proximal setting. Synchronous salt movement throughout the Early Cretaceous is observed on some of the salt diapirs within the Pri-Caspian Basin.
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New Insights on Hydrocarbon Plays in the Caspian Sea, Kazakhstan
Authors J.A. Martin Ltd and S.R. Toothill LtdNew exploration opportunities and improved imaging of already known prospects in the Caspian Sea, Kazakhstan are presented based on the acquisition, processing and interpretation of long-offset 2D seismic data acquired by CGGVeritas from 2006-2009. We have identified further examples of three already successful plays in the Caspian Sea and onshore, within open blocks in the North Caspian and North Ustyurt Basins and a fourth, relatively unknown play, in the North Ustyurt Basin. The already known plays include Devono-Carboniferous carbonate reefs and clastics, Triassic-Cretaceous post-salt clastics and carbonates in the North Caspian Basin and Jurassic- Cretaceous post-thrust clastics and carbonates in the North Ustyurt Basin. The fourth play that we have identified comprises thrust fault, anticlinal structures with Late Palaeozoic-Early Mesozoic clastic and carbonate reservoirs in the North Ustyurt Basin which, to our knowledge, has not been tested elsewhere in the region.
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The Main Results of Exploration Works on North Caspian
More LessThe main results of exploration works on North caspian.
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Probabilistic Rock Physics - A Step Forward in Seismic Reservoir Characterization, An Example from the Precaspian Basin
By A. JangirovA rock physics study was undertaken for one of the recent discoveries in Precapian basin. The probabilistic approach, used during the rock physics analysis, enables prior geological knowledge to be incorporated into a probabilistic prediction, capturing uncertainty and qualifying risk. The stochastic rock physics model, derived during this study, can be used to make quantitative predictions based on inversion results and stochastic rock physics models, generating lithology and fluid probability volumes.
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Application of Transient Electromagnetic Method (TDEM) for Oil and Gas Prospecting and Geoecological Problem Solving
Authors Y.A. Agafonov, S.V. Kompaniets, I.V. Buddo, A.A. Aksenovskaya and I.V. EgorovApplication of TEM method is very actual for oil and gas exploration, engineering and geoecological tasks. New developed technique of TEM survey is convenient tool for reservoirs exploration. New approach of EM survey is shown and examples of TEM application are indicated.
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Application of ARCGIS for Monitoring the License Activity in Russia
Authors L.N. Nabieva and E.V. BalashovaThe Ministry of Natural Recourses exposes new blocks for licensing for exploration and production rights on a regular basis. For the course of the last two years, we carried out monitoring and analysis of this licensing activity. For this purpose, a huge amount of geological and geophysical data was collected, including information about wells, structure maps, maps of seismic coverage, the pipeline net and more. Working with such big data volumes creates specific problems in terms of representation, storage, accessibility and visualization. To handle these data appropriately, we adapted the ARCGIS software complex. The application of GIS for monitoring the licensing activity enables a fairly speedy evaluation of the main parameters of a certain region. The data are stored in separate layers, which can be piled, so that the user can represent any type and any size of data in any desired combination. So one can combine, e.g., the existing infrastructure and data representing the exploration history as input for an economical evaluation model of the license block under consideration.
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Cap Rock Integrity Study for Kashagan oilfield
Authors D. Ybray and FIDEL IbragimovExperimental Program (EP) is the start of Kashagan development and field production (December 2012). EP is therefore the initial step and path to full field development. During the EP step, geological and dynamic information about the field is required for definition of the Full Field Development scheme. Critical subsurface information to be acquired includes: • Geological data (obtain from new wells) to assess reservoir quality, particularly in planned gas injection areas and the rim; • Reservoir production and injection data to establish reservoir potential; • Well performance data to evaluate areal and vertical sweep efficiency. By obtaining reservoir data from the wells drilled by the EP well clusters, reservoir quality in the core of the eastern platform will be determined and utilized to evaluate the production and injection potential of this key area for EP and full field development. The EP area also includes a number of wells placed in the Rim facies: well tests to date have been both low rate and short duration. Article will provide information on Kashagan Experimental Program objectives, implementation and overview of EP development scheme approval process within RoK authorities.
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Kashagan Experimental Program
Authors G. Gulya and FIDEL IbragimovThe main objective of this study is to develop a control scheme to maximise the bottom hole injection pressure without risking overpressure of the reservoir. Scope of the study is the identification of the characteristics of a monitoring system to be deployed in the Kashagan field. The monitoring program will be aimed to study the cap rock integrity, in presence of massive gas injection, in term of: • Detection of fractures • Fracture growth with time • Identification of gas flood front movement. The study investigates the technical aspects of Kashagan field and proposes possible monitoring design scenarios. The most suitable monitoring strategy to be adopted depends strongly on the philosophy of the cap rock integrity problem: the level of effort and the quantity of resources dedicated to monitoring increase with the necessity to detect fractures as early as possible at the beginning of their development and before they reach the cap rock layer. Experimental Program (EP) is the start of Kashagan development and field production (December 2012). EP is therefore the initial step and path to full field development. During the EP step, geological and dynamic information about the field is required for definition of the Full Field Development scheme.
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Status of geological exploration and perspectives of evaluation of oil exploration in the Kazakh sector of the Caspian Sea
Authors S.M. Isenov and S.G. KarimovStatus of geological exploration and perspectives of evaluation of oil exploration in the Kazakh sector of the Caspian Sea.
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Validated Training – The Way Forward
By E.C. FennA challenge faced by many companies is how to meaningfully develop the skills of their geoscience professionals without compromising their operational capacity. There is increasing recognition that formal accreditation for the skills learned is beneficial to both the company and the employee. The challenge for the training provider is how to ensure consistency in the award of a credit, and how to give it meaning in a global context. Accredited training courses leading to a university qualification offer one solution, whereby employees’ skills progression and competencies are rewarded with an industry-recognised higher diploma or Master’s degree. The net result is a team of highly trained and motivated geoscience staff, all with improved career prospects. A good example of this type of course is the postgraduate training offered to the oil and gas sector by Fugro Robertson Ltd and Royal Holloway, University of London. This fully validated, collaborative programme has been tailored to provide flexible and accessible training and assessment, leading to a recognised postgraduate qualification. The poster examines the benefits, versatility and success of this training model, and how it can complement existing training products.
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The Role of High Resolution Biostratigraphy in Exploration and Development
By L. NairnWell interpretation and successful field modelling depend on the availability of high quality data and the identification of time-equivalent units and events. Biostratigraphy has been proven to provide the data neccessary for confidently constraining the age of depositional sequences and identifying and constraining stratigraphic hiatuses. Interpretation of biostratigraphic data can be achieved both by reference to established, regional zonations and by the construction of local schemes based on high definition quantitative analyses to identify very localised, correlative field scale changes in individual taxon occurrences and the representation of groups indicative of particular environmental factors. High resolution biostratigraphic monitoring at wellsite enables accurate placement of casing and coring picks, identifies small scale faultsand hiatuses, and can play a major role in geosteering horizontal wells with a high degree of accuracy over long distances.
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Caspian Sea and Volga-Ural "Pgs-Khazar" and "Si-Technology" 2D/3D Seismic Integrated Data Super Projects
Authors M.S. Sharipov, D.F. Ismagilov, V.N. Kozlov, V.V. Dolgov and B.V. Zaporozhets"PGS-Khazar" and "SI-Technology" Caspian Sea & Volga-Ural 2D/3D Seismic Integrated Data Super Projects Show New Exploration Trends in Region
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Microseismicity Records Active Reservoir at Karachaganak Field, West Kazakhstan
Authors T. Daley, M. Morosini, M. Eales, A. Boivineau and C. NicouKarachaganak Petroleum Operating b.v. has been continuously monitoring using a microseismic array in the east-central part of the giant Karachaganak Field, West Kazakhstan, since February 2009. The field is producing from low porosity carbonates reservoirs comprising of a 600m Carboniferous isolated platform overlain by Permian carbonate pinnacle structures. A 200m thick oil rim is overlain by a 1000m gas column. The 8-level microseismic array is deployed in a well between 3500m and 4100m sub-sea, and each geophone level is recording with 4-component data. Until the end of March 2010, over 1200 microseismic events have been located, most of which lie within a 4 km radius of the array. They are interpreted to be due to instability at, or near, top reservoir, or to dynamic response of fault and fractures zones in the reservoir due to hydrocarbon production activities. The distribution of the former set will form part of the hazard mapping for future drilling activity and potential savings could be many rig days, a costly side track or even avoiding a junked well. The latter type indicates some of the lateral and vertical reservoir boundaries or baffles and will result in a refinement of the static and dynamic reservoir models.
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