- Home
- Conferences
- Conference Proceedings
- Conferences
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
1 - 20 of 50 results
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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%.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-
-
-
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.
-