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67th EAGE Conference & Exhibition
- Conference date: 13 Jun 2005 - 16 Jun 2005
- Location: Madrid, Spain
- Published: 13 June 2005
1 - 50 of 683 results
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A Filter Bank Solution to Absorption Simulation and Compensation
By R. FerberIn this paper I present a digital filter bank solution to the problem of simulating or compensating the effect of absorption on seismic traces. I stay in the context of frequency-independent Q models for attenuation and dispersion. The key benefit of the outlined technique is that it can deal with arbitrarily time-variant Q i.e. is not limited to the case of mild variation of Q with time. Introduction Absorption simulation or compensation filtering in the context of this paper refers to the application of digital filters with the
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Reserves Determinations – An Independent Consultant's Observations
More LessEXECUTIVE SESSION NO PAPER AVAILABLE
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An Operator's Classification of Reserves and How to Determine Them
More LessEXECUTIVE SESSION NO PAPER AVAILABLE
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Measuring/Modelling Ultimate Production Systematically
More LessEXECUTIVE SESSION NO PAPER AVAILABLE
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How Oil Price Affects Reserves Disclosure
By Sergio PalmaEXECUTIVE SESSION NO PAPER AVAILABLE
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Simulation Study of Co2 Retention During Tertiary Eor Flood in Ivanic Oilfield
Authors B. Goricnik, D. Domitrovic, S. Šunjerga and D. VulinA017 SIMULATION STUDY OF CO2 RETENTION DURING TERTIARY EOR FLOOD IN IVANIĆ OILFIELD D. DOMITROVIĆ 1 S. ŠUNJERGA 1 B. GORIČNIK 2 D. VULIN 2 1 1 INA-Naftaplin Šubićeva 29 Zagreb Croatia 2 University of Zagreb – Faculty of Mining Geology and Petroleum Engineering Pierottijeva 6 Zagreb Croatia The outset of industrial age has been accompanied with a steady increase of atmospheric concentration of carbon dioxide (CO2) from anthropogenic sources mainly from fossil fuel combustion within energy sector as well as from other industrial activities. Ever since the adverse effect of the process on climate change (i.e. global warming) has
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Monitoring Techniques Applied for CO2 Injection in Coal
Authors P. Winthaegen, F. van Bergen, H. Pagnier, B. Jura, Z. Kobiela and J. SkibaA018 Monitoring techniques applied for CO2 injection in coal Abstract 1 To demonstrate that CO2 injection in coal under European conditions is feasible and that CO2 storage is a safe and permanent solution and that coal bed methane can be produced in the same process the EC funded RECOPOL project is being carried out. In order to improve the understanding of storage in coal to verify that safety and environment are not jeopardised and to determine that the CO2 is injected into the intended coal layers an extensive monitoring programme is applied. This monitoring programme is based on FEP analyses
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The Mechanical Impact of CO2 Injection
Authors B. Orlic and B. SchrootA019 Abstract The mechanical impact of CO2 injection 1 B. ORLIC B. SCHROOT Netherlands Institute of Applied Geoscience TNO – National Geological Survey PO Box 80015 3508 TA Utrecht The Netherlands. The mechanical impact of CO2 injection into a depleted hydrocarbon field or aquifer is caused by changes in the stress field resulting from changes in the pore pressure and volume of the rock. Mechanical processes can lead to the loss of reservoir and caprock integrity and the reactivation of existing faults. A geomechanical numerical modelling approach to determining the mechanical impact of CO2 injection is presented and demonstrated on
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Modeling Halite Precipitation around CO2 Injection Wells in Depleted Gas Reservoirs
Authors A. Battistelli, T. Giorgis and D. MarzoratiA020 Modeling halite precipitation around CO2 injection wells in depleted gas reservoirs Abstract 1 Precipitation of solid NaCl (halite) is known to occur both at producing wells during exploitation of gas reservoirs and at gas injection wells in aquifer storage fields where high salinity brines are present. Water vaporization into the gas phase is the recognized mechanism responsible for salt concentration in the residual brine which can be followed by solid salt precipitation with rapid loss of formation permeability. Halite precipitation has also been anticipated by numerical modeling of CO2 injection in saline aquifers for greenhouse gas sequestration in geological
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Capillary Alteration of Shaly Caprocks by Carbon Dioxide (SPE94183)
Authors P. Chiquet, D. Broseta and S. ThibeauSPE 94183 Capillary Alteration of Shaly Caprocks by Carbon Dioxide P. Chiquet and D. Broseta SPE Laboratoire des Fluides Complexes U. of Pau and S. Thibeau SPE Total Copyright 2005 Society of Petroleum Engineers This paper was prepared for presentation at the SPE Europec/EAGE Annual Conference held in Madrid Spain 13-16 June 2005. This paper was selected for presentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper as presented have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author(s).
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K12-B a Test Site for CO2 Storage and Enhanced Gas Recovery (SPE94128)
Authors L.G.H. van der Meer, E. Kreft, C. Geel and J. HartmanSPE 94128 K12-B A Test Site for Co2 Storage and Enhanced Gas Recovery L.G.H. van der Meer SPE E. Kreft SPE and C. Geel TNO Environment and Geosciences J. Hartman GDF Production Nederland Copyright 2005 Society of Petroleum Engineers This paper was prepared for presentation at the SPE Europec/EAGE Annual Conference held in Madrid Spain 13-16 June 2005. This paper was selected for presentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper as presented have not been reviewed by the Society of Petroleum Engineers and are subject
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Detailed in Situ Stress Measurements for Qualifying the Safety of Underground Gas Storage Overburden (SPE94253)
Authors D.M. Fourmaintraux, A.-P. Bois, C. Le Goff and S. CantiniSPE 94253 Detailed in Situ Stress Measurements for Qualifying the Safety of Underground Gas Storage Overburden D.M. Fourmaintraux SPE Total E&P; A.-P. Bois SPE APB Consulting; C. Le Goff Total IGF; and S. Cantini SPE Schlumberger Copyright 2005 Society of Petroleum Engineers This paper was prepared for presentation at the SPE Europec/EAGE Annual Conference held in Madrid Spain 13-16 June 2005. This paper was selected for presentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper as presented have not been reviewed by the Society of Petroleum Engineers
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Efficient Wellbore Cement Sheath Design Using the SRC (System Response Curve) Method (SPE94176)
Authors D. Fourmaintraux, A.-P. Bois, C. Franco, B. Fraboulet and P. BrossolletSPE 94176 Efficient Wellbore Cement Sheath Design Using the SRC (System Response Curve) Method D. Fourmaintraux SPE Total E&P; A.-P. Bois SPE and C. Franco APB Consulting; B. Fraboulet SPE and P. Brossollet Total E&P Copyright 2005 Society of Petroleum Engineers This paper was prepared for presentation at the SPE Europec/EAGE Annual Conference held in Madrid Spain 13-16 June 2005. This paper was selected for presentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper as presented have not been reviewed by the Society of Petroleum Engineers and
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Sparse Radon Transforms with Bound-Constrained Optimization
By A. GuittonA025 1 INTRODUCTION SPARSE RADON TRANSFORMS WITH BOUND-CONSTRAINED OPTIMIZATION ANTOINE GUITTON Department of Geophysics Stanford University Stanford CA 94305 USA Radon transforms are popular operators for velocity analysis (Taner and Koehler 1969; Guitton and Symes 2003) noise attenuation (Foster and Mosher 1992) and data interpolation (Hindriks and Duijndam 1998; Trad et al. 2002). One property that is often sought in radon domains is sparseness where the energy in the model space is focused without transformation artifacts. Sparseness is especially useful for multiple attenuation and interpolation. In practice depending on the radon transform sparseness can be achieved either in the Fourier
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2D Deconvolution for OBC Data and for Internal Multiple Attenuation – Part 1 – Theory
Authors P. Hugonnet and C. TichatschkeA026 2D deconvolution for OBC data and for internal multiple attenuation – Part 1: Theory Abstract 1 We present herein the extension to the OBC case of a 2D pre-stack predictive deconvolution originally designed for surface-related multiple attenuation of streamer data. The formulation of this extension can also be applied for internal multiple attenuation. However while it is strictly exact for the OBC case it is probably rather an approximation for the internal multiples. Part 1 of this paper sets out the theory while the illustrations and application cases on synthetic and real data are brought together in Part 2
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3D Surface-Related Multiple Modeling
Authors A. Pica, G. Poulain, B. David, M. Magesan, S. Baldock, T. Weisser, P. Hugonnet and P. HerrmannA028 3D Surface-Related Multiple Modeling Abstract 1 A. PICA G. POULAIN B. DAVID M. MAGESAN S. BALDOCK T. WEISSER P. HUGONNET AND Data-driven SRME techniques do not require any a priori knowledge of the subsurface (reflectivity structures and velocities). However these methods require a shot location at each receiver location wherein lies the main difficulty for their 3D implementation. Today solutions involve reconstruction of the missing data or reconstruction of the missing multiple contributions. In the following we present a model-based surface-related multiple modeling technique (SRMM) free from any constraint relating to the shot position (including OBC) and distribution. Introduction:
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Fast 3D Wave-Equation Prediction of Multiples
More LessA029 Fast 3D wave-equation prediction of multiples 1 Summary. We present a new efficient wave-equation scheme for prediction and subtraction of water-layer multiples and peg-legs from locally 1D sea-floor with an arbitrary 3D structure below it. The method is suitable for the majority of data from the North Sea. For current quasi-3D marine acquisition with poor sampling between shots in the crossline direction the method is accurate for receiver-side prediction but approximate for source-side prediction. The prediction and adaptive subtraction of multiples are performed in the same domain therefore no additional sorting or additional transformations are required. All source-side and
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3D SRME Practice for Better Imaging
Authors D. Lin, J. Young, W.-J. Lin, M. Griffiths and M. HartmannA030 Z-99 3D SRME Practice for Better Imaging Summary 1 DECHUN LIN JERRY YOUNG WEN-JACK LIN MALCOLM GRIFFITHS MONICA HARTMANN Veritas DGC 10300 Town Park Houston TX 77072 USA Proper parameter selection is key to the success of 3D SRME. The major parameters include surface grid size and crossline aperture. We show that SRME crossline gathers can be used to determine both parameters. We also use a data example from Gulf of Mexico (GOM) to demonstrate the benefits of 3D SRME. Introduction In a marine environment strong contamination from surface multiples is one of the major problems in imaging sub-surface
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A Comparison of Sparse Inversion Techniques for 3D SRME
Authors M. Schonewille Inc., R. Hegge and R. van BorselenA031 A comparison of sparse inversion techniques for 3D SRME Abstract 1 MICHEL SCHONEWILLE ROB HEGGE AND ROALD VAN BORSELEN PGS Court Halfway Green Walton-on-Thames Surrey KT12 1RS UK In 3D surface related multiple elimination shot-gathers are convolved with receiver gathers to obtain multiple contribution traces which in principle can be summed over the inline and cross-line direction to obtain a predicted multiple trace. With current acquisition geometries the sampling in the cross-line direction is sparse which leads to aliasing artifacts when this summation is carried out. It has been proposed to use a sparse inversion over hyperbolic or parabolic
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Multiple Diffractions and Coherent Noise in Marine Seismic Data
Authors N. Hargreaves and R. WombellA032 Multiple diffractions and coherent noise in marine seismic data Abstract 1 The kinematics of both the primaries and the multiples (multiple diffractions) from sea-floor scatterers have similar characteristics when the sea floor is reasonably smooth and has only isolated irregularities. The multiple diffractions like the primary scattering are organised in mid-point gathers in such a way that mid-point stacking can enhance portions of the multiple. Also like the primary scattering the multiples can be distinguished from primary reflection events in the data by their dip in pre-stack shot and receiver gathers. Pre-stack dip-filtering in those domains can be used
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Multichannel Near-Surface Corrections
Authors X. Campman and G.C. HermanA033 0-000 MULTICHANNEL NEAR-SURFACE CORRECTIONS XANDER CAMPMAN 1 and GÉRARD HERMAN 2 1 1 Department of Applied Mathematics Delft University of Technology P.O. Box 5031 2600 GA Delft The Netherlands 2 Shell International E&P Summary The near subsurface can give rise to variations in travel times and amplitudes of upcoming reflections and strong scattered surface waves obscuring reflections. Near-receiver scattered noise can be considered a combination of these problems. On an intra-array scale near-receiver scattered noise can be tracked along a few traces. This implies that it can be suppressed using a deterministic method. We have developed such a method;
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Forward and Inverse Scattering of Surface Waves
Authors A. Kaslilar, C.D. Riyanti, X. Campman and G.C. HermanA034 0-000 FORWARD AND INVERSE SCATTERING OF SURFACE WAVES Summary A. KASLILAR 1 C.D.RIYANTI 1 X.CAMPMAN 1 and G.C. HERMAN 2 1 Institute of Applied Mathematics Delft University of Technology P.O. Box 5031 2600 GA Delft The Netherlands. 2 Shell E&P The Netherlands. Surface waves can be used for imaging near surface layers since they are sensitive to near surface heterogeneities. We developed a method for imaging shallow subsurface heterogeneities and estimating their density contrast using scattered surface waves. We consider 3D elastodynamic scattering by heterogeneities in a laterally invariant layered embedding. We represent the scattered wavefield as a domain
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Estimation of Complex Near Surface Focusing Operators by Global Optimization
Authors D.J. Verschuur and B. El MarhfoulA035 Z-99 Estimation of complex near surface focusing operators by global optimization Abstract 1 Near surface anomalies can severely degrade the data quality and conventional single trace statics do not always correct for these effects sufficiently. Through a model-independent focusing operator estimation procedure based on the CFP technology the data can be redatumed to a level underneath the near surface. However the current procedure is still laborintensive as travel time errors need be picked or tracked in the involved DTS-panels. Therefore under the assumption of a low-order surface-consistent parameterization of the near surface focusing operators the method of finding the
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Sparse 3D Data Kirchhoff Redatuming
Authors S. Tegtmeier, D.J. Verschuur and A. GisolfA036 Abstract SPARSE 3D DATA KIRCHHOFF REDATUMING S. TEGTMEIER D.J. VERSCHUUR and A. GISOLF Delft University of Technology Lab. of Acoustic Imaging and Sound Control PO Box 5046 2600 GA Delft The Netherlands By including a redatuming step in the seismic processing stream the results of the processing can be improved considerably. Due to an increasing amount of 3D data it becomes more and more important to develop a feasible method for the redatuming of 3D prestack data. Common 3D acquisition designs produce relatively sparse data sets which cannot be redatumed successfully by applying conventional wave-equation redatuming. We present a
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Multidimensional Filtering of Irregularly Sampled Seismic Data
More LessA037 Z-99 MULTIDIMENSIONAL FILTERING OF IRREGULARLY SAMPLED SEISMIC DATA Abstract 1 In this paper we introduce a new technique for multidimensional filtering of irregularly sampled seismic data. In this context filtering may be used for coherent noise and interference attenuation as well as the generation of seismic images. The filtering operation consists of the convolution of the filter operator with the seismic data. The filter operator is usually computed on a regular grid (rectangular or hexagonal) that corresponds to the nominal sampling of the seismic data. Unfortunately in the physical world the seismic data are often sampled at irregular spatial
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Recovering Dense and Regularly Sampled 5-D Seismic Data from Current Land Acquisition
Authors S. Xu, Y. Zhang and G. LambaréA038 Z-99 Recovering dense and regularly sampled 5-D seismic data from current land acquisition Abstract 1 SHENG XU 1 * YU ZHANG 1 GILLES LAMBARÉ 2 1 Veritas DGC 10300 town park Drive Houston Texas 77072 USA 2 Ecole des Mines de Paris 35 Rue St. Honoré Fontainbleau 77305 France Ideal 3-D land seismic data processing requires a dense five-dimensional dataset though the current land acquisitions only involve sparse line spacing for both shot lines and receiver lines. Limited by the field conditions even the sparsely sampled seismic data cannot be acquired on a regular grid. Therefore an effective regularization
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Seismic Data Reconstruction Using the Pyramid Transform
Authors B. Hung, C. Notfors and S. RonenZ-99 SEISMIC DATA RECONSTRUCTION USING THE A039 Abstract 1 We present a new method for seismic data regularization using the pyramid transform. By exploiting the property that prediction error filters are frequency-independent in the pyramid domain we can use them as numerical regularization operators to constrain the forward modeling operator that maps the model space to the data space within the context of an inversion. The data can then be reconstructed by transforming the model in the pyramid domain back to the original (f-x) domain. Using synthetic and field data examples we show that data reconstruction using the pyramid transform
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Robust Curvelet-Domain Data Continuation with Sparseness Constraints
More LessA040 4248 ROBUST CURVELET-DOMAIN DATA CONTINUATION WITH SPARSENESS CONSTRAINTS Abstract FELIX J. HERRMANN Department of Earth and Ocean Sciences University of British Columbia Vancouver BC Canada A robust data interpolation method using curvelets frames is presented. The advantage of this method is that curvelets arguably provide an optimal sparse representation for solutions of wave equations with smooth coefficients. As such curvelets frames circumvent – besides the assumption of caustic-free data – the necessity to make parametric assumptions (e.g. through linear/parabolic Radon or demigration) regarding the shape of events in seismic data. A brief sketch of the theory is provided as
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Regional Model during TAGI Desposition in Berkine Basin (Algeria)
Authors J. Salvadores, C. Rossi, O. Kalin, T. Bartrina, A. Alaminos and J.L. SolanoA042 4628 Regional Model during TAGI deposition in Berkine Basin (Algeria) Introduction 1 The Triassic fluvial reservoir sandstones of the TAGI remain a challenge for the oil industry as one of the main targets in North Africa. Although the milestones to its understanding have been placed in the last two decades (A. Boudjema 1987; Gauthier et al.1995; Scott et al.1997; Echikh 1998; Cochran et al.2000; Acheche et al.2001; C. Rossi et al.2002; Turner et al.2002; Eschard et al.2003) there is still room to debate new insights. Objective AUTHOR(S) J. SALVADORES 1 C. ROSSI 2 O. KÄLIN 2 T. BARTRINA 1
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Tectono-Stratigraphic Evolution and Controls on Volcanics in Early Cretaceous in Hameimat Area, Libya
Authors C.G. Ottesen, W. Heerde and T. WeiheA043 Tectono-Stratigraphic Evolution and Controls on Volcanics in Early Cretaceous in Hameimat Area Libya Abstract 1 CHRISTIAN G. OTTESEN WOLFGANG HEERDE & THOMAS WEIHE [email protected] (Copenhagen) [email protected] & [email protected] (Libya) The study focuses on the Nakhla Tuama and Hamid Fields and associated N- & P-Structures (Fig.1) and it reflects a systematic evaluation of all borehole image logs other openhole logs extensive core material and subsequent comparison with seismic interpretation results. The structural objective was to refine the understanding of structural influence on basin evolution volcanism depositional variability and the influence of later tectonics on reservoir quality. This would provide one
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The Thermal Regime and Petroleum Potential in the Russian Sector of the Bering and Okhotsk Seas
Authors I.A. Lipovetsky and L.E. LevineA044 The Thermal Regime and Petroleum Potential in the Russian sector of the Bering and Okhotsk Seas. Abstract 1 In the Western part of the Bering sea and in the Okhotsk sea development of two rift systems: the Late Mesozoic-Cenozoic and Late Cenozoic. The high petroleum potential of these systems was proven by discovery of many oil/gas fields in the West Pacific rift belt. The connection between thermal regime of sedimentary cover and age of rifting or spreading can be using for divided all sedimentary basins and subbasins into three categories: the oil-gas bearing; potentially oil-gas bearing and non-prospective for
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Geological Modeling of Intrusive Bodies
Authors S.A. Petersen and N. SkjeiA045 Geological modeling of intrusive bodies 1 S.A. PETERSEN N. SKJEI Norsk Hydro PO Box 7190 N-5020 Bergen Norway Summary A method for the construction of geological models is presented which includes the presence of intrusive bodies. The development was triggered by modeling studies of 4D seismic effects of sand intrusions above the Grane oil production field (North Sea). Structurally complex intrusion patterns are easily obtained and at any scale. The method is applicable to most types of intrusive bodies and in a way that allows several physical forward evaluations to be invoked (seismic induction log etc.). Introduction The Grane
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Characterization and Occurrence of Opal-Reflectors
Authors P. Pedersen, T. Throndsen, F.T. Lysell, Å.H. Drotting and T. RautakorpiA046 Characterization and Occurrence of Opal-Reflectors Summary 1 Opal-reflectors are observed worldwide in many sedimentary basins. They may be misinterpreted as direct hydrocarbon indicators or as bottom-simulating-reflectors related to gas hydrates. Currently correct interpretation of such reflectors is a challenge in seismic interpretation of petroleum prospects offshore Mid-Norway. A better understanding of opal-reflectors may improve risk assessment in areas where such reflectors occur. Furthermore an increased understanding of opal-reflectors may provide constraints on depositional environment tectonic models and temperature and maturity simulations. In this study we use well observations seismic interpretation and modelling to highlight opalreflectors to provide a better
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Reservoir Modeling of Sand Injections and Significance to Field Performance – Balder Field, Norwegian North-Sea
Authors A. Hjellbakk, D. Bergslien, N. Briedis, R.E. Hill and G.J. MoirA048 Reservoir modeling of sand injections and significance to field performance: Balder Field Norwegian North-Sea Abstract 1 A.HJELLBAKK¹ D.BERGSLIEN¹ N.BRIEDIS¹ R.E.HILL² and G.J.MOIR³ ¹ExxonMobil Exploration and Production Norway AS PO Box 60 4064 Stavanger; Norway ªExxonMobil Upstream Research Company currently Mobil Producing Nigeria Unlimited ³ExxonMobil Upstream Research Company currently retired/consultant The Balder Field started production in 1999 and is producing from seven oil accumulations in three stratigraphic intervals of Paleocene to early Eocene age. The reservoirs are deep-water gravity flow deposited sands draped and sealed by hemipelagic mud and volcanic tuff. Initial reservoir compartmentalization was modified by post-depositional sand remobilization
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Integrated Approach to Acquisition Geometry Analysis
Authors E.J. van Veldhuizen and G. BlacquièreB001 Z-99 Integrated approach to acquisition geometry Abstract 1 analysis E.J. VAN VELDHUIZEN 1 and G. BLACQUIÈRE 2 1 Delft University of Technology Acoustic Imaging and Sound Control PO Box 5046 NL-2600 GA The Netherlands EAGE 67 th Conference & Exhibition — Madrid Spain 13 - 16 June 2005 2 TNO Delft The Netherlands From a subsurface image that is obtained from seismic data after data processing it should be possible to retrieve information about the properties of the subsurface target. However the image can be biased by the acquisition geometry: it contains an acquisition footprint which can obstruct the
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Efficient Software Tools and Methodologies to Optimize Marine Survey Planning
By A. JakobsenZ-99 EFFICIENT SOFTWARE TOOLS AND METHODOLOGIES TO OPTIMIZE MARINE SURVEY PLANNING B002 Summary 1 The optimisation of survey parameters can be an overwhelming effort without having efficient software tools to explore alternative survey and vessel configurations for a given Earth model. A significant effort has been invested to develop integrated survey planning tools that allow the evaluation of seismic data quality after the processing steps. Key elements are the automation of the modelling workflow exchangeable modelling components as well as automated processing algorithms within a common framework. In this paper we describe these integrated and customized tools and present methodologies
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Acquisition Design of the First 4 Component 3D Ocean Bottom Seismic in the Caspian
Authors J. Bouska, T. Lyon, R. Johnston, D. Bddery, D. Howe, M. Mueller, L. Thomsen and D. EbromB003 Acquisition Design of the First 4 Component 3D Ocean Bottom Seismic in the Caspian Summary 1 The signal to noise problems inherent in towed streamer data associated with mud volcanoes subsurface heterogeneities and distributed gas in the Azeri and Gunashli structures of the Caspian sea prompted the use of three dimensional four component ocean bottom seismic (3D/4C OBS) to improve imaging. The introduction of several innovative enhancements to the traditional ocean bottom cable technique when applied cohesively across both acquisition and processing resulted in cost savings compared to conventional OBS acquisition and improved final data quality compared to towed
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Increasing Ray – Path Density in Land Seismic Acquisition – The Source Problem
Authors J. Meunier and T. BianchiB004 Z-99 Increasing Ray-path Density in Land Seismic Acquisition – The Source Problem. Abstract 1 JULIEN MEUNIER* AND THOMAS BIANCHI Compagnie Générale de Géophysique 1 rue Léon Migaux 91341 Massy France For a wide range of reasons such as illumination surface multiple and surface noise reduction increases in source and receiver density are required in land seismic operations. From an economic point of view an increase in receiver density requires extra investment extra labor and a high shooting rate while an increase in source density mainly requires only high shooting rate. From a technical point of view a significant increase
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Cascaded Sweeps – A Method to Improve Vibroseis Acquisition Efficiency – A Field Test
Authors N. Moldoveanu, F. Ortigosa, M. Benabentos, P. Munoz and B. SlopeyB005 Cascaded sweeps- a method to improve vibroseis acquisition efficiency: A field test Summary 1 One of the techniques introduced in the last decade to address the improvement in productivity for vibroseis land acquisition was the cascaded sweep method (Andersen 1995 Moerig and all 2001). In the summer of 2004 Repsol-YPF and WesternGeco performed a field experiment in the Reynosa- Monterrey block Mexico to determine if the use of cascaded sweep method could be beneficial for the seismic exploration program planned for this block. The purpose of this paper is to present the results of this field experiment. Introduction FRANCISCO
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Detection of Inconsistent Coupling in Point-Receiver Land Seismic Data
Authors C. Bagaini and C. Barajas-OlaldeB006 Z-99 Detection of inconsistent coupling in pointreceiver land seismic data Abstract 1 The digitization of the signals recorded by individual geophones in onshore seismic acquisition gives rise to the opportunity to address a phenomenon well known but impossible to effectively tackle using geophone arrays: inconsistent coupling conditions. We present a method for addressing this long-standing problem and apply it to the data acquired during a field experiment with controlled coupling conditions. Introduction It has been recognized for some time that the motion of a geophone case resting on the earth’s surface is not the same as the motion of
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Towards the Low Frequencies– Equipments and Applications
By D. MougenotB007 TOWARDS THE LOW FREQUENCIES: EQUIPMENTS AND APPLICATIONS 1 Summary New acquisition equipment is described that makes it possible to emit and receive low frequencies (below 10 Hz). This includes: for land heavy vibrators and digital accelerometers; for marine high pressure air gun clusters. The primary interest of recording low frequencies is to improve vertical resolution of surface seismic by widening the frequency spectrum. Enrichment of the reflected signal by lower frequencies is also critical for exploration of deep targets for converted wave recording and for post-stack amplitude inversion. Introduction A large improvement in the vertical resolution of surface seismic
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The SOS Source – A Method and Arrangement for a 4D Seismic Source
By O.E. NaessB008 The SOS Source: A Method and Arrangement for a 4D Seismic Source Summary 1 A novel marine seismic source has been developed. This has the ability to remain laterally closer to the pre-plotted line than currently existing sources. It is therefore ideal for 4D surveys. Application of the method and arrangement for a 4D source was first simulated on a full reservoir monitoring seismic survey. Field tests were performed during the 2004 Norne 4D survey in the Norwegian Sea. Results have been analyzed. It appears that the new source is a viable and practical solution. There is a Statoil
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Shear-Wave Anisotropy from Far Offset VSP
Authors R. Zhou, X. Zhao and D.J. DushmanB017 Z-99 SHEAR-WAVE ANISOTROPY FROM FAR Abstract 1 Two types of shear waves have been recorded from a land VSP survey at zero and far offset locations with a vertical Vibroseis source. The two shear waves polarized normal to the compressional waves traveled at different velocities indicative of possible shear-wave splitting. Shear-wave anisotropic parameter γ was estimated from the traveltime data which ranges mostly from 6 to 15%. These results show that zero and offset VSP data can be used to detect and evaluate formation anisotropy. Introduction OFFSET VSP RAN ZHOU XIAOMIN ZHAO AND DAVID J. DUSHMAN VSFusion 16430 Park
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Birefringence Analysis Using Simulated Annealing
Authors H. Dariu, P.Y. Granger and R.J. GarottaB018 Z-99 Birefringence analysis using simulated Abstract 1 By using PS-wave multi-component seismic data it is possible to obtain robust estimates of several subsurface parameters. A global optimization algorithm is proposed to automatically estimate highresolution birefringence (splitting) attributes versus depth. Estimated quantities such as the natural direction of the fast S-wave and the time lag between the fast and slow S-waves can be directly related to fracture orientation and their density. Birefringence effects of the overburden must be determined and removed prior to estimation of the fracture properties at target horizons. Tests of this global optimization method on synthetic and
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A Complex SVD-Polarization Filter for Ground Roll Attenuation on Multi-Component Data
Authors K. de Meersman and R. KendallB019 A complex SVD-polarization filter for ground roll attenuation on multi-component data Summary 1 By their very nature multi-component (3C/9C) datasets provide information on the full wavefield and therefore offer new full wave-field solutions for the ground roll problem. Here we introduce a time-domain 3C complex SVD (Singular Value Decomposition) polarization filter that is optimized to remove most ground roll energy whilst preserving the reflected energy. A 3C Eastern European dataset is used to test filter performance on shot gathers. Finally vertical-component stacks from two polarization filters with different design length are compared to a control stack with no ground
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Ground Roll Detection and Attenuation by 3C Polarization Analysis
More LessB020 Ground roll detection and attenuation by 3C polarization analysis Abstract 1 Ground roll is one of the most troublesome noises of land data and its elimination is often a challenge. Three-component (3C) seismic recording offers techniques to suppress it by exploiting its elliptical polarization nature. We present a flexible method that detects and subsequently removes the ground roll using polarization analysis. The polarization analysis is carried out by doing singular value decomposition (SVD) of the matrix formed by a sliding time window (data-adaptive) of every singlestation 3C recording. We derive a new attribute from the singular values of the
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Comparison of Multi-Component Data from Different MEMS Sensors
Authors S. Ronen, J. Gibson, R. Burnett, J. Roy, B. Montgomery, R. Kendall, L. Comeaux and H. WattB021 Comparison of multi-component data from different MEMS sensors Abstract 1 At least two types of three component (3C) sensors based on Micro-Electro Mechanical Systems (MEMS) technology have become available. We acquired and processed multicomponent data with the two different systems over the same area. Although the two MEMS sensors employ different designs differences between the processed datasets are small. In this paper we present the results. Introduction Land multicomponent seismology is a growing business since the introduction of single sensor 3C receivers deployed in shallow drilled holes. Such single sensor receivers have improved the data quality and have also
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