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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
41 - 60 of 585 results
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Anisotropic Complex-Padé Hybrid Finite-difference Depth Migration
Authors D. Amazonas, R. Aleixo, J. Schleicher and J. CostaStandard real-valued finite-difference (FD) and Fourier finite-difference (FFD) migrations cannot handle evanescent waves correctly, which can lead to numerical instabilities in the presence of strong velocity variations. A possible solution to these prob
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Including Lateral Velocity Variations into True-amplitude Wave-equation Migration
Authors A. Novais, D. Amazonas, G. Melo, R. Aleixo, J. Schleicher and J. CostaIn heterogeneous media, standard one-wave wave equations only describe the kinematic parts of one-wave wave propagation correctly. For a correct description of amplitudes, the one-way wave equations must be modified. In vertically inhomogeneous media, the
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Stable Reverse-time Migration in Variable-tilt TI Media
Authors W. Liu, K. P. Bube, L. B. Zhang and K. NiheiPseudo-acoustic modeling and reverse-time migration can be sensitive to phase velocity specifications in propagating waves in anisotropic media. The 2nd-order pseudo-acoustic equations with Alkhalifah's approximation can result in unstable extrapolation i
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Fourier Finite-difference Migration for 3D TTI Media
Authors A. A. Valenciano, C. C. Cheng, N. Chemingui and S. Brandsberg-DahlWe introduce a Fourier finite-difference (FFD) method for migration by wavefield continuation in media with tilted transverse isotropy (TTI). Our TTI approximation, as its isotropic counterpart, consists of three terms: a phase-shift, a thin-lens, and fin
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Duplex Wave Migration for Coal-bed Methane Prediction
Authors N. Marmalevskyi, A. Antsiferov, Z. Gornyak, I. Khromova, A. Kostyukevych and M. TirkelA case study of using migration of duplex waves to trace zones of near-vertical fracturing in coal formation is described. As a rule, coal-bed methane traps are connected with these zones, however, identification and tracing of them based on the standard
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Steep Dip Imaging Using an Orthogonal One-way Wave Equation Migration
More LessAn orthogonal one-way wave equation migration method is implemented to overcome the dip limitation of a one-way wave equation. Besides the conventional downward propagation of the source and receiver wave fields, an extra propagation along horizontal dire
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Near-surface Issues in TTI Wave Equation Migration from Topography
Authors C. P. Ursenbach, R. A. Bale and S. H. GrayWave-equation migration, which uses more accurate wavefield extrapolation techniques than ray-based Kirchhoff migration, produces high-quality images beneath complex overburdens. However, near-surface images resulting from wave equation methods are somet
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The Effect of Resistivity Anisotropy on Transient Electromagnetic Earth Responses
Authors B. A. Hobbs, D. Werthmüller and F. EngelmarkResistivity anisotropy is shown to have a dominant effect on earth electromagnetic responses. In particular we consider transverse anisotropy with a vertical axis of symmetry and show the effects of varying anisotropy on land and marine earth step and imp
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Analytic Solutions to the Thin Resistor EM Problem
Authors N. H. Cuevas, D. L. Alumbaugh and H. F. MorrisonAs the CSEM method develops into a widely used tool for hydrocarbon exploration, the interest grows around the understanding of the EM wave propagation in a diffusive regime. Recent papers have introduced the concept of the resistive wave guide, arising a
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Iterative Extended Born Approximation Based CG-FFT Integral Equation Method for Low-frequency 3D Modeling
Authors A. Moradi Tehrani and E. SlobWe present a fast method for three-dimensional modeling low frequency CSEM problems. We apply the method to the marine controlled source electro-magnetic (MCSEM) exploration situation. For 3D problems fast computational methods are relevant for both forwa
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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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