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69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007
- Conference date: 11 Jun 2007 - 14 Jun 2007
- Location: London, UK
- ISBN: 978-90-73781-54-2
- Published: 11 June 2007
561 - 574 of 574 results
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The theoretical investigations of the attenuation and absorption for longitudinal wave in vertically-inhomogeneous viscoelastic solid medium
More LessP359 The theoretical investigations of the attenuation and absorption for longitudinal wave in verticallyinhomogeneous viscoelastic solid medium V.A. Brygynevych* (Reokona) SUMMARY the theoretical investigations results for seismic absorption and attenuation were fulfilled by means of such processing methods which were based on the combined model of vertically-inhomogeneous viscoelastic isotropic solid medium that guarantees the correct description of seismic deformation. The combined model generalization of deformable viscoelastic isotropic solid medium was represented for the case when hers viscoelastic properties vary depending on depth. The presence of the dual impulse response during longitudinal wave propagation is defined by the stressedly-deformed state of
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3D Reconstruction of Area Sounding TEM – Theory and Practice
Authors G. Trigubovich, M. Persova and Y. SoloveichikP360 3D Reconstruction of Area Sounding TEM – Theory and Practice G. Trigubovich* (SNIIGGiMS) M. Persova (SNIIGGiMS) & Y. Soloveichik (Novosibirsk State Technical University) SUMMARY This paper is devoted to the analysis of possibilities of different electrical survey technologies by means of field transient. The issues concerning the application of 1D- 2D- and 3D-inversions for EM data interpretation are discussed. The errors due to the use of 1D models for the interpretation are considered in the paper using the synthetic data as an example. One of the practical applications of the area technology and the 3D interpretation of EM data
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Experimenting Single Vibrator Seismic Acquisition
Authors J. Meunier, T. Bianchi and S. RagabB005 Experimenting Single Vibrator Seismic Acquisition J. Meunier* (CGG) T. Bianchi (CGG) & S. Ragab (Shell Egypt NV) SUMMARY In order to prove both the technical and operational efficiency of the single vibrator technique an experiment was conducted with 12 single-vibrator fleets operating in slip sweep mode with a slip time equal to the listening time. The average productivity over the entire test duration was 590 VPs/hour. The processed single vibrator data compares favorably with production data. EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 Introduction Going somewhat belatedly down the road opened up
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Seismic Imaging and Processing with Curvelets
Authors F. J. Herrmann, G. Hennenfent and P. P. MoghaddamB030 Seismic Imaging and Processing with Curvelets F.J. Herrmann* (University of British Columbia) G. Hennenfent (EOS-UBC) & P.P. Moghaddam (EOS-UBC) SUMMARY In this paper we present a nonlinear curvelet-based sparsity-promoting formulation for three problems in seismic processing and imaging namely seismic data regularization from data with large percentages of traces missing; seismic amplitude recovery for subsalt images obtained by reverse-time migration and primary-multiple separation given an inaccurate multiple prediction. We argue why these nonlinear formulations are beneficial. EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 In this paper we report recent developments on the
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Multi-Azimuth Towed Streamer 3D Seismic in the Nile Delta, Egypt – Processing Solutions
Authors W. E. A. Rietveld, E. Manning, M. A. Benson, J. Keggin, A. Burke and A. A. HalimC015 Multi-Azimuth Towed Streamer 3D Seismic in the Nile Delta Egypt – Processing Solutions W.E.A. Rietveld* (BP Egypt) E. Manning (BP EPT) M.A. Benson (BP Egypt) J. Keggin (BP Egypt) A. Burke (PGS Egypt) & A.A. Halim (PGS Egypt) SUMMARY A thin but complex layer of partially eroded anhydrite and other facies lie at a depth of around 3km across large areas of the Nile Delta in the Mediterranean. Wavefield distortion attenuation and the generation of complex multiple diffraction noise cause the quality of the underlying seismic image to be highly variable. Multi-azimuth (MAZ) seismic can help resolve these issues
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Using Seismic Velocity to Estimate Denudation, West of Ireland
Authors R. Hardy, F. Biancotto, S. M. Jones, D. Brennan and N. J. WhiteC047 Using Seismic Velocity to Estimate Denudation West of Ireland F. Biancotto (Trinity College Dublin) R. Hardy* (Trinity College Dublin) S. M. Jones (Trinity College Dublin) D. Brennan (Trinity College Dublin) & N.J. White (University of Cambridge) SUMMARY Estimating the temporal and spatial variation of uplift and denudation is important in exploration of the Slyne basin West of Ireland. Commonly used methods such as apatite fission track analysis are restricted to sparse well data and so the spatial coverage is limited. Results are also variable. In this paper we apply a new inverse method which calculates denudation from carefully calibrated
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Monitoring Reservoir Compaction by Joint Inversion of Seafloor Subsidence and Time–Lapse Seismic Timeshift Data
Authors S. J. Bourne and P. J. HatchellD008 Monitoring Reservoir Compaction by Joint Inversion of Seafloor Subsidence and Time–Lapse Seismic Timeshift Data S.J. Bourne* (Shell International Exploration & Production BV) & P.J. Hatchell (Shell International Exploration & Production BV) SUMMARY Areal monitoring of reservoir compaction is possible using geophysical measurements such as time-lapse seismic or surface subsidence. Changes in seismic travel time induced by vertical strain within the overburden provide a measure of reservoir compaction. However uncertainty in the geomechanical model linking overburden strain and reservoir compaction limits our knowledge of reservoir compaction. Likewise surface subsidence induced by top reservoir subsidence provides a second independent measure of
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Micro-scale Modeling of Poroelastic Reflection – Theory vs Numerical Simulation
Authors R. Ciz, E. H. Saenger and B. GurevichP003 Micro-scale Modeling of Poroelastic Reflection – Theory vs Numerical Simulation R. Ciz* (Freie Universitaet Berlin) E.H. Saenger (ETH and Spectraseis Zurich) & B. Gurevich (Curtin University and CSIRO Petroleum Perth) SUMMARY Numerical rock physics is an emerging tool in the analysis of elastic wave propagation on micro-scale. The viscoelastic extension of the displacement-stress rotated staggered finite-difference (VRSG FD) grid technique is applied to the numerical modeling of poroelastic phenomena. Specifically the simulations of the reflection from the poroelastic interface are performed on micro-scale. The effect of the Biot’s slow wave on the reflected fast compressional wave is investigated in
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A New Rock Physics Model for Sand-Clay Structures with Effective Porosity
Authors R. Ciz and B. GurevichP004 A New Rock Physics Model for Sand-Clay Structures with Effective Porosity B. Gurevich (Curtin University and CSIRO Petroleum Perth) & R. Ciz* (Freie Universitaet Berlin) SUMMARY The distribution and amount of clay content within the sandstone has a great impact on seismic velocities. This knowledge of clay content is also important for reservoir characterization and interpretation of properties from well logs and seismic data. Reliable rock physics models implementing porosity clay content and fluid saturation are required for the inversion algorithms. Simultaneous inversion of porosity clay content and saturation is formally non-unique from P- and S-velocities. This difficulty can
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Sesimic Reflector Characterization by a Multiscale Detection-Estimation Method
Authors M. Maysami and F. J. HerrmannP027 Sesimic Reflector Characterization by a Multiscale Detection-Estimation Method M. Maysami* (University of British Columbia) & F.J. Herrmann (University of British Columbia) SUMMARY Seismic transitions of the subsurface are typically considered as zero-order singularities (step functions). According to this model the conventional deconvolution problem aims at recovering the seismic reflectivity as a sparse spike train. However recent multiscale analysis on sedimentary records revealed the existence of accumulations of varying order singularities in the subsurface which give rise to fractional-order discontinuities. This observation not only calls for a richer class of seismic reflection waveforms but it also requires a different methodology
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Analysis of Guided Waves Recorded on Permanent Ocean Bottom Cables
Authors P. J. Hatchell, P. B. Wills and M. LandroP063 Analysis of Guided Waves Recorded on Permanent Ocean Bottom Cables P.J. Hatchell* (Shell International Exploration & Production BV) P.B. Wills (Shell International Exploration & Production BV) & M. Landro (NTNU) SUMMARY Guided waves propagating in the water layer are observed on data from the permanent OBC cables at Valhall. These waves have large amplitudes and result from post-critical p-wave reflections at the seafloor. Two methods for analyzing these waves are examined: one in terms of the normal mode theory of Press and Ewing and the second in terms of ray theory. It is found that the dispersion relationship predicted
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Quantifying Movement of Gas-Oil Contact from Time-Lapse Data on Troll West
Authors K. Gjerding and R. OnaP071 Quantifying Movement of Gas-Oil Contact from Time-Lapse Data on Troll West K. Gjerding* (Norsk Hydro) & R. Ona (Norsk Hydro) SUMMARY Time-lapse seismic (4D seismic) is an integrated part of the well process on Troll where its uses range from planning of infill-wells between already existing producers geo-steering and verification of the Troll geological model. Through 4D modeling a workflow aiming at mapping the gas-oil-contact (GOC) after production is developed. Inputs for forward modeling are saturations of gas oil and water and their changes in the individual zones as well as pressure changes. Convergence is met when attributes derived
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Fractal Analysis of Ultrasonic Emission in Compressed Rock
Authors R. Ciz and V. RudajevP216 Fractal Analysis of Ultrasonic Emission in Compressed Rock R. Ciz* (Freie Universitaet Berlin) & V. Rudajev (Geological Institute AS CR Prague) SUMMARY Fractal dimensions describe the random and deterministic processes by different values. Progressive microfracturing during the rock sample compression is known to be fractal. To evaluate the predictive value of fractal dimension for the estimation of rock structure failure two different experimental ultrasonic time series were analyzed: first series recorded during the short-term experiment with continuous linear loading regime and second series of middle-term experiment with incremental increase of action force. The results show that fractal dimensions decrease
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Inverting for Pressure Using Time-Lapse Time-Strain – Application to a Compacting GOM Reservoir
Authors N. Hodgson, C. MacBeth, L. Duranti, J. Rickett and K. NiheiA028 Inverting Strain – Application for Pressure to Using a Compacting Time-Lapse GOMTime- Reservoir N. L. Duranti Hodgson* (Chevron (Heriot-Watt ETC) J. University) Rickett (Chevron C. MacBeth ETC) (Heriot-Watt & K. Nihei (Chevron University) ETC) SUMMARY Quantitative estimation of dynamic reservoir properties from time-lapse seismic is becoming increasingly widespread. In compacting reservoirs however the 4D seismic signal is complex due to stress and strain redistribution in reservoir and non-reservoir rocks. Several authors have reported observing measurable time-shifts in the overburden on time-lapse seismic data. A method for using these overburden time-lapse time-shifts to invert for reservoir pressure change is presented.
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