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71st EAGE Conference and Exhibition incorporating SPE EUROPEC 2009
- Conference date: 08 Jun 2009 - 11 Jun 2009
- Location: Amsterdam, Netherlands
- ISBN: 978-90-73781-67-2
- Published: 08 June 2009
51 - 100 of 585 results
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Controlled Source Electromagnetic Interferometry by Multidimensional Deconvolution – Spatial Sampling Aspects
Authors J. Hunziker, E. C. Slob and K. WapenaarWe review electromagnetic interferometry by multidimensional deconvolution (MDD) and investigate its sensitivity to spatial sampling. Two Sea Bed Logging datasets were modeled numerically. One represents a shallow sea situation with a small vertical sourc
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A Modeling Study of Low-frequency CSEM in Shallow Water
Authors M. A. Frenkel and S. DavydychevaThe applicability and resolution power of low-frequency Controlled-Source Electromagnetic (CSEM) data in shallow and deep water environments are studied on typical CSEM benchmark models. We apply the fast and accurate 3D finite-difference (FD) modeling co
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2.5D Frequency Domain EM Modeling in Conductive TIV Media
Authors T. Wiik, B. Ursin and K. HokstadWe present a framework for 2.5D EM modeling in conductive TIV media based on integral equations. The method is developed for mCSEM purposes, thus assuming inline polarization of the source and crossline invariant media. The framework is tested numerically
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Advantages of 3D MT Modeling in Resolving Anomalous Responses – Case Studies
Authors T. Mogi, Y. Yamaya and H. IchiharaA variety of 2D inversion methods for analyzing magnetotelluric data has been favored lately and these methods have contributed enormously to the interpretation of observed data. However, the topography and structural composition of volcanoes and coasts a
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Geo-electric Analysis Based on Quantitative Separation between Electro-magnetic and Induced Polarisation Field Response
Authors P. C. H. Veeken, P. Legeydo, I. Pesterev, Y. Davidenko, E. Kudryavceva and S. IvanovThe geo-electric method allows mapping of resistivity and induced polarization effects in the subsurface. It permits detection of diagenetic alteration zones with micro-pyrite crystals, situated some distance above hydrocarbon accumulations due to leakage
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Mixed-phase Wavelet Estimation Using Unwrapped Phase of Bispectrum
More LessThe high-order spectra have been used to determine the complex phases of seismic wavelets. However, phases of high-order spectra, derived from a single seismic trace, are generally wrapped and corrupted by noise. In this paper, the wavelet is estimated us
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Geopressure Prediction in Carbonate Reservoirs Using Self-organized Mapping Method
Authors N. M. AlBinHassan and Y. H. WangThe most commonly used methods to predict fluid pressure before drilling are based on seismic velocities. Although geopressure is predicted successfully in some cases using seismic velocities with sufficiently high-resolution, these methods are applicable
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Multi-dip Estimation in n Dimensions
Authors Y. Traonmilin, G. Lambaré, P. Herrmann, N. Deladerriere and K. GarceranLocal dip information picked from seismic data has numerous applications such as: attenuation of coherent and random noise, structurally consistent filtering of seismically derived attributes, RMO flattening and velocity model update. We propose an extens
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Seismic Trace Conversions by Sinc-function Based Interpolation
Authors N. Ettrich, D. Merten and S. K. FossPicking in seismic traces can be combined with operations like frequency filtering and Hilbert transforming. The basic formula simply is an inner product of the vector of original data and an operation-specific interpolating function that is derived from
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Sparseness of Seismic Reflectivity Inversion
More LessSeismic reflectivity inversion using a Cauchy constraint in a least-squares solution is sparser than that from conventional Gaussian regulation and hence is more widely desired by geophysicists when calculating reflectivity series. In this paper, we estim
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3D Non-linear Anisotropic Diffusion Filtering for Noise Removal and Image Enhancement
More LessIn this paper we present the application of Eni's 3D non-linear anisotropic diffusion filter to 3D depth migrated seismic data. The implementation of the filter is based on the full diffusion equation, i.,e., it supports non-linear, adaptive, and steered
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Amplitude-preserving Calibration of PP- and PS-wave Reflection Events
More LessThis paper presents a PP- and PS-wave calibration method based on the accurate estimation of the time-variant velocity ratio. The PS-wave amplitude is then recovered through applying a stretch-correction method. Given an initial VP-to-VS ratio model, we i
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High Resolution Acoustic Records for Detection of Main Geohazards in Development of Hydrocarbon Fields in Arctic Seas
Authors I. E. Balanyuk, A. N. Dmitrievsky and S. M. ShapovalovA considerable attention is paid for research with seismic acoustic methods of the modern sedimentation of the Barents Sea region which is important for development of reliable criteria for the sea bed stability. The major processes that controlled a str
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Detection and Analysis of Near-surface Layer Effects in Land Seismic Exploration
More LessThe effects of near-surface layers in land seismic exploration had been known long before. However, previous studies mainly focused on statics brought by propagation through near-surface layers (from the kinematics point of view), and only some surface-co
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Data Management for Well Complexity Analysis on North Sea Wells
Authors S. Valipour Shokouhi and P. SkalleOne of the most important requirements of any good drilling operation is efficient hole cleaning. Produced particles have to be transported to the surface without leading to other problems. Otherwise, it culminates in difficulties such as tight-hole, pack
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Global Hydrocarbon Reserves, Production and Consumption
Authors P. Chungkham and D. ArbouilleDistribution of hydrocarbon remaining reserves, reserves addition, annual production and consumption across the globe by geological provinces, countries and regions shows some interesting and highly imbalance scenarios. Such simple analyses would help in
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Improving Data Integration by Means of XML
Authors R. A. Iushchenko, O. K. Iushchenko and V. G. TulchinskyA problem of geoscience end exploration data interoperability is discussed. Modern data exchange formats are mostly based on XML because of its mobility, structure representation power and excellent program interfaces. However, real application data are s
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Geographic Information System – An Application to Manage Geophysical Data
Authors M. Giustiniani, A. Accettella, M. Loreto, U. Tinivella and F. AccainoIn this study, we show an application of Geographical Information System (GIS) for managing geophysical data acquired in along the South Shetland Margin (Antarctic Peninsula). The dataset has been acquired in the frame of two projects regarding the integr
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Petrophysical Study on Selection of Potential Layers for Hydraulic Fracturing Operation
Authors B. Habibnia and S. R. ShadizadehHydraulic fracturing is a process applied to boreholes to improve the ability of reservoir fluids to flow towards the hole and be recovered. Fractures can play a very important role in the productivity of low permeability formations. Ahwaz oil field is on
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Effect of Average Intersection Per Line on Connectivity in Fractured Reservoir, Using Percolation Theory
Authors A. Hashemi, S. Ghorbani and M. MasihiThe knowledge of the connectivity across the reservoir not only helps to find out the potential oil recovery within a particular well configuration but also affects on the other reservoir engineering decisions such as infill drilling. Connectivity also co
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An Integrated Geomechanics, Rock Physics and Seismic Model
Authors E. Fjær and T. G. KristiansenA screening tool for simulation of expected 4D seismic effects in connection to a depleting reservoir is described. A few examples of how the model can be used to interpret seismic observations are given. These include the development of traveltime shift
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CO2CRC/Otway Project – Influence of Geological and Reservoir Parameters on Expected Time-lapse Seismic Signal
Authors A. Gendrin, M. Urosevic, S. Bouquet, H. Bernth, P. Wisman, D. Labragere and M. VerliacIn the field of CO2 storage, one important goal is to be able to prove that the injected CO2 is safely stored, and that no leak is occurring. Time-lapse seismic is one of the most powerful tools available for this purpose. However, it is generally used in
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How Small Is a Small 4D Signal – A Model Study for 4D Resolution
Authors J. H. Y. Yu and J. ThiebaudWith the maturation of 4D seismic, legacy 3D data are replaced by purposely-shot conventional 3D surveys with multiple monitors and short time separation to follow the impact of production. Furthermore, permanent seismic installation like has been proven
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Well Performance Analysis Using 4D Seismic
Authors M. Nickel and L. SonnelandIn this paper a methodology is presented that may allow to detect an over-pressured region in the overburden which was induced from an injector well. Increased pore pressure in the overburden results in decreased velocities which may affect the time-laps
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A Comparison of Passive Seismic Monitoring of Fracture Stimulation Due to Water Versus CO2 Injection
Authors J. Verdon, S. C. Maxwell and J. M. KendallThe principal observation from passive seismic monitoring at the Weyburn CCS/EOR project has been a very low rate of microseismicity. This has lead to the suggestion that, as CO2 has a higher compressibility, when injected it will have a lower seismic eff
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To a Cost Effective Approach for Monitoring CO2 Storage Sites
Authors V. P. Vandeweijer, T. Benedictus, P. L. A. Winthaegen and F. BergenSubsurface storage of CO2 is regarded as one of the options to reduce the impact of human activity on climate change. In order to ensure save, long-term storage of CO2, a storage site has to meet requirements concerning health, safety and environment. Pe
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Interpretive Processing – Combining Data Driven Velocity Modelling and Geological Knowledge for Seismic Imaging
Authors J. K. Fruehn, R. Bastia, N. Kettouche and I. F. JonesImaging off the east coast of India poses a specific set of challenges for velocity model building and the migration. Significant topographical variation in the sea bed gives rise to numerous effects which must be dealt with starting with the water veloci
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First Arrival Traveltime Tomography for Complex Near-surface Velocity Structures
Authors M. S. Noble, C. Taillandier and H. ChaurisClassical algorithms used for travel time tomography are not necessarily well-suited for handling very large seismic data sets, densely parameterized velocity models and for taking advantage of current supercomputers architecture. We revisit the classical
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Channel Tomography
Authors G. Conroy and R. LeggottShallow channels in the North Sea and other areas can present significant problems for PreSDM model building. We present a fully ray-traced tomographic approach to channel modelling that handles multiple offsets and horizons to solve for a laterally-vari
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Kinematically Equivalent Factorized Models
By A. M. StovasWithin the framework of factorized model, there is a family of kinematically equivalent velocity models resulting in uncertainties in inverted model parameters and other kinematical characteristics.
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Method for Calibrating Seismic Imaging Velocities
More LessAnisotropy can cause large depth errors in images obtained with isotropic velocity analysis and depth migration. Typically, the errors become apparent only where the seismic image intersects a well location, that is, where true depths are measurable. Sp
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Effective HTI Model Parameters from Full Azimuth Reflection Angle
More LessWe use residual moveouts measured along continuous full azimuth reflection angle gathers, in order to obtain effective HTI model parameters. The angle gathers are generated through a special angle domain imaging system, for a wide range of reflection angl
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Determination of Traveltime Parameters in VTI Media
Authors R. Aleixo, J. Schleicher and J. CostaFor modern long-offset acquisition geometries, a hyperbolic traveltime approximation is no longer sufficient to flatten the CMP gather because of medium inhomgeneity or anisotropy. For transversly isotropic media with a vertical symmetry axis (VTI media),
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Moveout Approximation for HTI/VTI Layered Media
More LessAnisotropy in subsurface geological models is primarily caused by two factors: Sedimentation in shale/sand layers and fractures. The sedimentation factor is mainly modeled by Vertical Transverse Isotropy, whereas the fractures are modeled by a Horizontal
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Seismic Modelling with Discontinuous Galerkin Finite-element Method – Application to Large Scale 3D Elastic Media
Authors V. Etienne, J. Virieux, N. Glinsky and S. OpertoWe present a Discontinuous Galerkin (DG) finite-element formulation with convolutional perfectly matched layer (CPML) absorbing condition suitable to large scale seismic modelling in 3D elastic media. The issues of performance and load balancing of the pr
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qSV-wave Triplications in Multilayered VTI Media
Authors Y. V. Roganov and A. StovasTriplications for qSV-waves are important features of the wave propagation in a transversely isotropic (VTI) medium with vertical symmetry axis. They can create problems for standard seismic processing. We analyze the triplications conditions in the multi
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Numerical Simulation of Waves' Propagation in Anisotropic Elastic Media by Lebedev's Grids – RAM Saving and Stable PML
Authors V. V. Lisitsa, E. V. Lys and D. M. VishnevskyThis paper presents Lebedev scheme (LS) for simulation of waves' propagation in arbitrary anisotropic elastic media. This is second order explicit finite-difference scheme on staggered grids and is natural generalization of well known Virieux one used for
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3D-3C Seismic Wave Modeling in Multilayered Anisotropic Viscoelastic Media Using the Haskell-Thomson Method
Authors V. Roganov, Y. Roganov and A. KostyukevychA stable method for calculating 3D-3C seismic reflected and transmitted wavefields in a horizontally layered anisotropic viscoelastic medium is derived. It makes use of delta-operators, the sixth-dimensional Stroh formalism and the Haskell-Thomson matrix
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The Decomposed Element-Free Galerkin Method for Visco-Elastic Wave Propagation with Wave Scattering Problems
Authors M. Katou, T. Matsuoka, H. Mikada and E. AsakawaWe have developed the Decomposed element-free Galerkin method (DEFGM), a kind of three-dimensional finite-element method for solving wave-propagation problems. We first compared the DEFGM with analytical or reflectivity method for checking the accuracy. T
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Wave Propagation Modeling in Viscoelastic Heterogeneous Media with CPML
Authors A. Dhemaied, F. Rejiba, C. Camerlynck, L. Bodet and R. GuérinA 2nd order accurate time, 2nd or 4th order accurate space, 2D P-SV staggered-grid finite-difference scheme is proposed to simulate seismic-wave propagation in unbounded viscoelastic media, for both seismology and engineering applications. The anelastici
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Our Experiences of 3D Synthetic Seismic Modeling with Tip-wave Superposition Method and Effective Coefficients
Authors H. B. Helle, M. Ayzenberg, A. Aizenberg, K. D. Klem-Musatov, J. Pajchel and B. UrsinWe show that seismic waves travelling in the subsurface are subject to two physically different processes, namely propagation inside smoothly inhomogeneous layers and reflection and transmission at internal reflectors. We propose a new approach to modelin
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Efficient Algorithm for 3D Ray Tracing in 3D Anisotropic Medium
Authors M. Dwornik and A. PietaIn this paper we present efficient algorithm for 3D ray tracing in anisotropic medium using parallel algorithms. Algorithm bases on Fermat's principles and uses grid model of velocity parameters. Arrival time of propagation was calculated only on external
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Proxy Models for Unconventional Gas Forecasting and Reserve Analysis
Authors C. Jordan, C. R. Smith, R. Jackson and B. WaeyenCurrently, there is an assortment of reservoir analysis methods ranging from traditional decline and type-curve matching to rate-pressure polynomials and detailed rate-pressure simulation. Yet, despite its many limitations, conventional decline analysis i
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Prediction of Fracture Systems with Geomechanical Reservoir Models – Case Study Piesberg
By R. BissenThe detailed documentation of joint systems and their spatial variability are crucial for the optimal exploitation of fractured reservoirs. The extrapolation of well data up to reservoir scale is complex. This study investigates the potential of geomechan
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Challenging the Myth of Layercake Stratigraphy of Permian Rotliegend Reservoirs – A Case Study from the P1 Block
Authors V. M. Vernain-Perriot, S. Baffi, A. Moscariello, C. Baunack and G. ParryThis paper describes the results of a reservoir characterisation study of the Rotliegend reservoir in the structure P01-FA located in the western part of the Netherlands sector of the North Sea. Sedimentology, log analysis and high-resolution seismic were
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Practical Experience of the Operative Finding, Mapping and Monitoring of Man-caused Gas Pool by Geoelectric Methods
Authors M. Yakymchuk, S. P. Levashov, I. M. Korchagin and B. B. SyniukThe practical experience of experimental application in 2008 of untraditional geoelectric methods of forming short-pulsed electromagnetic field (FSPEF) and vertical electric-resonance sounding (VERS) (FSPEF-VERS express-technology) for the monitoring obse
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Tournaisian and Visean Deep Stratigraphic Gas Traps – Example from the MEX/GOL-SV Felds in the Dnieper-Donets Basin
Deep, stratigraphic gas traps in the Dnieper-Donets Basin (DDB), Ukraine, are subject to increased interest and development activities in recent years. 3D time-migrated seismic data processed in 2008, first time access to full well log coverage by means o
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Rock Physics Based Prestack Seismic Reservoir Characterization – Application to Thin Bed
Authors Y. B. Guo, Y. J. Zhou, J. Q. Tao, X. H. Zhang and M. QiangIn this paper, we study the Sulige gas field, the largest gas field found so far in China. Reservoir prediction in this area is challenging due to the thin beds and strong heterogeneity. Based on the geological conditions of the main pay zone, we first co
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The Giant Azadegan Field, Reservoir Characterization Focused on Sarvak Fm. Reservoirs
Authors B. Mostaghel and Z. AfrassiabianAfter Discovery of three giant fields before Islamic revolution of Iran, in exploration order, Agahhajary, Ahwaz and Marun, one of the most important giant fields which have discovered between 1999 – 2003 in the world, was AZADEGAN. The AZADEGAN field is
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Applying Neuro-fuzzy Model to Predict Reservoir Properties from Seismic Attributes – A Case Study in an Oil Field in Iran
Authors M. R. Vasheghani Farahani, M. Nabi-Bidhendi, H. Khoshdel and S. TorabiWe applied neuro-fuzzy model to predict reservoir properties from seismic attributes. We used local linear neuro-fuzzy model tree (LOLIMOT) algorithm to train our model. This model uses well log data and seismic attributes in a well location for training.
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