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63rd EAGE Conference & Exhibition
- Conference date: 11 Jun 2001 - 15 Jun 2001
- Location: Amsterdam, Netherlands
- Published: 11 June 2001
81 - 100 of 516 results
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High Performance Computing - a View of the New Economic Landscape
By J. WattsIC-3 HIGH PERFORMANCE COMPUTING - A VIEW OF THE NEW ECONOMIC LANDSCAPE JOHN WATTS Abstract: 1 IBM UK Ltd 76 Upper Ground London SE1 9PZ UK The computational resource deployed for geophysical applications is now showing markedly different patterns of use across applications varying from extremely data-intensive to extremely compute-intensive - and all points in-between. When considering compute platforms to run these applications the costs and trade-offs that have to be made create an 'economic landscape' that constrains and directs industry choices and the previously familiar landscape is now being radically altered by the advent of open source software and
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A Comparison between Scalable Shared Memory and Cluster Architectures in a Production Processing Environment
More LessIC-4 A COMPARISON BETWEEN SCALABLE SHARED MEMORY AND CLUSTER ARCHITECTURES IN A PRODUCTION PROCESSING ENVIRONMENT TO BE ADVISED SGI Abstract The talk describes current architectures for High-Performance Computing both SGI's cache-coherent Non-Uniform Memory Access architecture and current clusters together with the programming and system management characteristics of both. This description will look at high-volume production processing for seismic and reservoir simulation and will distinguish between the price per FLOP and production management aspects of using these two approached either as alternatives and in a hybrid combination. 1 EAGE 63rd Conference & Technical Exhibition — Amsterdam The Netherlands 11 - 15
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3D Full Tensor Gradient Applications in Europe
Authors J. Macfarlane, C. Murphy, F. Stalin and G. MumawIG-1 3D FULL TENSOR GRADIENT APPLICATIONS IN EUROPE COLM MURPHY FREDERIC STALIN GARY MUMAW and JOHN MACFARLANE Abstract Summary 1 Although 3D FTG data is now routinely acquired throughout Europe still relatively few geoscientists have had direct experience of working with the data and know when this technology would be most beneficial for them. This paper explains some of the primary uses for which 3D FTG data has been used successfully in Europe in the last two years and though not exhaustive should give a good overview of the most common applications of this exciting new technology. Introduction Bell Geospace
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Gravity Gradients for De-Risking PreStack Depth Migration
Authors E.K. Biegert, M. Talwani and D.J. SmitIG-2 GRAVITY GRADIENTS FOR DE-RISKING PRESTACK DEPTH MIGRATION Summary 1 E.K. BIEGERT 1 M. TALWANI 2 and D.J. SMIT 3 1 Shell International Exploration and Production Inc. 3737 Bellaire Boulevard Houston TX 77025 USA 2 Rice University 3 Shell U.K. Exploration and Production Subsurface de-risking is presently almost exclusively done by methods using seismic data. Indeed all other data collected at the surface is referred to as 'non-seismic' data expressing this fact. However there are emerging gravity measurement technologies that could fundamentally change the game of subsurface risk management. In a companion paper 1 we discussed how gravity gradiometer data
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Gravity-Gradient Data Integrated in Pre-Stack Depth Migration in the Southern North Sea
Authors H. Dejong, I. Al-Kindy and E. BiegertIG-3 GRAVITY-GRADIENT DATA INTEGRATED IN PRE-STACK DEPTH MIGRATION IN THE SOUTHERN NORTH SEA Summary 1 Shell U.K. Exploration and Production have acquired gravity-gradient data in the Southern North Sea to aid velocity/depth model building for pre-stack depth migration (PreSDM). Gravitygradient data has higher resolution than conventional gravity data (typically 600 m versus 3 km). Rather than validating the model after a full-blown volume migration the data have been incorporated into the loop of iterative PreSDM using linear relationships between layer velocities and densities derived at well positions. The difference between the gravity-gradient field measurements and the model response has been
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3D Inversion of Potential Fields with Depth Resolution
Authors V. Paoletti, M. Fedi, P.C. Hansen and A. RapollaIG-4 3D INVERSION OF POTENTIAL FIELDS WITH DEPTH RESOLUTION M. FEDI 1 P.C. HANSEN 2 V. PAOLETTI 3 and A. RAPOLLA 1 1 1 Naples University Dipartimento di Scienze della Terra 2 Technical University of Denmark Department of Mathematical Modelling 3 Naples University Dipartimento di Geofisica e Vulcanologia Largo S. Marcellino 10 80138 Naples Italy Abstract A method for the 3D inversion of potential fields with depth resolution is here presented and discussed. This method faces the problem of inherent nonuniqueness of source parameter determination by introducing appropriate a priori information about the source parameters and by inverting a 3D
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4D Microgravimetry in Geoengineering
By J. MrlinaIG-5 4-D MICROGRAVIMETRY IN GEOENGINEERING 1 JAN MRLINA Geophysical Institute Dept. of Gravimetry Boční II 1401 141 31 Prague 4 Czech Republic Introduction Rock stability origin of fractures rock-bursts and sinkholes unknown voids and caverns in the subsurface as well as mass sliding belong to major problems of engineering geology and environment. In all such cases the mass (rock) undergoes changes of bulk density as fracturing disintegration tension and other similar processes cause rock deformation resulting in the increase of porosity. Consequently bulk density can decrease to a significant extent. As these geomechanical processes often progress from geological “source” up
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4D Monitoring Using Gravity and Gravity Gradients
Authors E.K. Biegert and S. WitteIG-6 4-D MONITORING USING GRAVITY AND GRAVITY GRADIENTS E.K. BIEGERT 1 and S. WITTE 2 Introduction 1 1 Shell International Exploration and Production Inc. 3737 Bellaire Boulevard Houston TX 77025 USA 2 Shell International Exploration and Production B.V. Gas-Fluid contacts within reservoirs have the potential to create large density contrasts that may produce gravity anomalies detectable by suitable sensitive gravimeters and gradiometers. In a time-lapse or 4-D mode these sensors may act either directly as monitors of reservoir performance or can be used as "triggers" to aid in choosing when an expensive 4-D seismic "snapshot" might be required. Gravity has
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Suppression of Water-Layer Multiples and Peg-Legs by Wave-Equation Approach
More LessIM-1 SUPPRESSION OF WATER-LAYER MULTIPLES AND PEG-LEGS BY WAVE-EQUATION APPROACH DMITRI LOKSHTANOV 1 Norsk Hydro Research Centre PO Box 7190 5020 Bergen Norway Summary. Removal of water-layer multiples and peg-legs is still one of the major processing problems in offshore exploration. The requirements on the optimal wave-equation approach for the suppression of such multiples are the following: 1) Without knowledge of the subsurface structure (except the approximate geometry of the water-bottom) it should correctly predict the kinematics of multiples. 2) The adaptive subtraction of the predicted multiples should be consistent with the data model (correct multiple suppression operator) and should
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High Resolution Radon - a Review
Authors P. Hugonnet, P. Herrmann and C. Ribeirom = W ⋅ G m = (G H H ⋅ (G ⋅ W ⋅ G 2 ⋅ G + λ W −1 −1 ) H 2 + λ I) ⋅ d (E 2) ⋅ G ⋅ d (E 3) The weighting matrix W is the key point. If it is the identity-matrix we end up with the standard least-squares decomposition. To obtain a high resolution decomposition some weights are put on the diagonal to enforce the focusing of the decomposition on its most significant spectral components. For example: H −1 ( ) ( ) ( ) ⎟ ⎠ ⎜
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Surface Multiple Removal - Current Status and New Challenges
Authors D.J. Verschuur, E.J. Van Dedem and R.G. van BorselenIM-03 SURFACE MULTIPLE REMOVAL: CURRENT STATUS AND NEW CHALLENGES D.J. VERSCHUUR 1 E.J. VAN DEDEM 1 and R.G. VAN BORSELEN 2 1 Delft University of Technology Centre for Technical Geoscience Lab. of Acoustic Imaging and Sound Control PO Box 5046 2600 GA Delft The Netherlands 2 PGS Seres London Summary The surface-related multiple removal method has proven to be successful on a large number of data cases. It is becoming one of the standard tools being applied by several companies. One of the major shortcomings in the current implementation is that a 2-D assumption is made. Currently several attempts are
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3D Post-Stack Multiple Attenuation via Pattern Recognition - a Land Carbonate Case Study
Authors P.G. Kelamis, B. Caselitz, S. Spitz and S.C. KelloggIM-4 3D POST-STACK MULTIPLE ATTENUATION VIA PATTERN RECOGNITION – A LAND CARBONATE CASE STUDY Summary 1 This paper discusses a de-multiple technique that aims at removing only the multiple energy (surface related and internal) associated with specified primary events and generated by an identified mechanism. A “model” of the targeted noise event is obtained post-stack using a simple 1D earth assumption. Removal of the targeted multiple is achieved via a pattern recognition technique implemented in the frequency-space (f-xy) domain. The performance of this multiple elimination methodology is demonstrated using 3D seismic data from a land carbonate environment. A two-step process
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Free Surface Multiple Removing via Iterative Prestack Migration
Authors Y.-H. De Roeck, J.-M. Cognet, G. Chavent and F. ClementFree surface multiple removing via iterative prestack migration Introduction Y.-H. DE ROECK J.-M. COGNET G. CHAVENT F. CLEMENT IFREMER Acoustics and seismics group PO Box 70 F-29280 Plouzané France INRIA-Rocquencourt This study focuses on the suppression of the free-surface multiple in the framework of waveform inversion. No 1D assumption is made on the medium thus dipping events in the sea-bed can be represented with their true characteristics with regards to amplitude modulation versus the incident angle. The propagation model incorporates a specular reflection coefficient on the sea-bed that encompasses the local roughness of the first layer. However the model remains
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Multidimensional Multiple Attenuation of OBS Data
Authors A. Osen and L. AmundsenIM006 MULTIDIMENSIONAL MULTIPLE ATTENUATION OF OBS DATA A. OSEN and L. AMUNDSEN Statoil Research Centre 7005 Trondheim Norway Introduction Previously Amundsen (2001) has presented a general wave-equation method for multidimensional signature deconvolution (“designature”) and elimination of free-surface related multiples (“demultiple”) from four-component ocean bottom seismic (OBS) data. Contrary to other free-surface multiple attenuation schemes the method requires no information about the source signature. Here we consider implementation and testing of the multidimensional multiple attenuation and designature scheme for general inhomogeneous media. The designature and demultiple algorithm may be divided into two major computational steps. First a multidimensional “deconvolution operator” being
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Imaging Conditions for Primary Reflections and for Multiple Reflections
Authors J. Sheng, H. Sun, Y. Wang and G.T. SchusterIM-07 Summary IMAGING CONDITIONS FOR PRIMARY REFLECTIONS AND FOR MULTIPLE REFLECTIONS JIANMING SHENG HONGCHUAN SUN YUE WANG and GERARD T. SCHUSTER WBB Rm 717 Dept. of Geology & Geophysics University of Utah Salt Lake City UT84112 USA Interest in multiple attenuation has been amplified due to the industry trend toward more challenging plays such as deepwater subsalt and sub-basalt areas. Unlike most of the proposed de-multiple methods which separate primary and multiple events prior to migration imaging we present two new approaches which process multiple reflections during migration imaging. In the first approach data are crosscorrelated and the multiples are
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The Role of Capillary Effects - Waterflooding Efficiency in Heterogeneous Sandstone Reservoirs
Authors L. Surguchev and B. AndersenIOR-01 THE ROLE OF CAPILLARY EFFECTS: WATERFLOODING EFFICIENCY IN HETEROGENEOUS SANDSTONE RESERVOIRS L.SURGUCHEV and B.ANDERSEN Abstract 1 Capillary forces govern oil flow in the porous medium. Wettability of the rock determines efficiency of oil displacement by injection agents. But due to lack of reservoir data complexity of the physical process and traditional simplistic simulation approach the role of capillary effects and zone rock properties is often neglected. This leads to inaccuracy in modelling reservoir sweep and oil displacement in heterogeneous reservoirs. The simulation model of the highly stratified formation in the North Sea was adjusted to account for permeability regions
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Improved Oil Productivity by Selective Water Control
Authors A. Stavland, A. Lohne and A. OlsenIOR-02 Improved Oil Productivity by Selective Water Control AUTHORS(S) Abstract This paper discusses a simple and cost effective method for selective water control using an oil soluble surfactant system. Bullhead injection of this system forms a blocking emulsion at high water cut without any permeability reduction at low water cut. The paper describes the behavior of the blocking emulsion and how to select chemicals with such behavior. The blocking effect at high water cut in coreflood experiments is demonstrated. The permeability reduction showed a reversible behavior upon variation in the pressure gradient as well as a long-term stability was obtained.
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Restriction of Water Production in Gas Wells Using Alcohol-Containing Polymer Solutions
Authors I. Lakatos, J. Lakatos-Szabó, B. Kosztin and G. PalásthyIOR-03 RESTRICTION OF WATER PRODUCTION IN GAS WELLS USING ALCOHOL-CONTAINING POLYMER SOLUTIONS Abstract 1 Gas production from gas fields and underground gas storage is usually accompanied by substantial water production. The high water production and limitations of water liquidation jointly deteriorate the recovery efficiency and hamper maintaining an environmentally friendly production. Therefore during the past decades intensive R&D activity has been made to develop a viable well treatment method which may offer a reliable solution for the mentioned problem. The most promising procedure might be the injection of a salt-containing polymer solution into the wells utilizing the reversible swelling/shrinking properties
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Comparison of Polymer and Waterflood Residual Oil Saturations
Authors S.G. Goodyear, D.J. Element, N.C. Sargent and A.J. JayasekeraIOR-04 COMPARISON OF POLYMER AND WATERFLOOD RESIDUAL OIL SATURATIONS Abstract 1 Polymer flooding can increase recovery in viscous oil fields compared to waterflooding through a combination of improvements in microscopic sweep (lowering the effective residual oil saturation) and areal and vertical sweep (reducing the detrimental effect of heterogeneity and gravity slumping of injected water). Analysis of core flood data comparing water and polymer flooding for a UKCS field indicated that polymer flooding was recovering more incremental oil than would be predicted using the basic water/oil relative permeabilities. However it was not possible to determine whether this difference was attributable to
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Geological Fundamentals for Using the Methods for Improved Oil Recovery in the Fields of Volga-Ural Oil-and-Gas Province
Authors N.A. Lebedev, A.N. Shakirov, G.I. Vasyasin and V.V. ChendarevIOR-05 GEOLOGICAL FUNDAMENTALS FOR USING THE METHODS FOR IMPROVED OIL RECOVERY IN THE FIELDS OF VOLGA-URAL OIL-AND-GAS PROVINCE Abstract 1 N.A. LEBEDEV 1 A.N. SHAKIROV 2 G.I. VASYASIN 1 and V.V. CHENDAREV 1 1 JSC NIIneftepromchim Yershov st. 29 420045 Kazan Russia 2 LC ”Tatnefteotdacha” By the present many different technologies for oil recovery increase have been tested on commercial scale. The technological effect of their use in the same deposits often varies greatly preventing the objective and statistically reliable evaluation of the technologies’ efficiency. That means that the efficient commercial use of the tested technologies for the physical and
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