- Home
- Conferences
- Conference Proceedings
- Conferences
67th EAGE Conference & Exhibition
- Conference date: 13 Jun 2005 - 16 Jun 2005
- Location: Madrid, Spain
- Published: 13 June 2005
21 - 40 of 683 results
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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;
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-