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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
1 - 50 of 585 results
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Waveform Inversion Using Blocky Parameterization in the Laplace Domain
Authors H. Lee, C. S. Shin, E. Robein and H. CalandraWaveform inversion in the Laplace domain does not critically depend on the initial velocity conditions and typically results in a long wavelength velocity model. Therefore, adopting a blocky parameterization of the velocity model with an appropriate block
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Full Waveform Inversion of Seismic Data for 2D Shallow Structures Imagery – Limitations and Perspectives
Authors A. Romdhane, G. Grandjean, R. Brossier, S. Operto and F. RéjibaAn alternative to seismic methods typically used in shallow subsurface prospecting (0-100m) consists in taking advantage of advances in quantitative imaging based on full waveform inversion, which is supposed to overcome their inherent limitations. In thi
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Efficient 3D Frequency-domain Full Waveform Inversion (FWI) with Phase Encoding
Authors H. Ben-Hadj-Ali, S. Operto and J. Virieux3D high resolution imaging methods such as full waveform inversion still suffer from their expensive computational cost, for instance because of the huge amount of data characterized by numerous shots and receivers. Performing shot assemblages or super-sh
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Frequency-domain Waveform Inversion Using an L1-norm Objective Function
More LessIn general, seismic waveform inversion adopts an objective function based on the L2-norm. However, waveform inversion using the L2-norm produces distorted results because the L2-norm is sensitive to statistically invalid data such as outliers. As an alter
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2D Acoustic Full Waveform Tomography – Performance and Optimization
Authors T. Bohlen, A. Kurzmann, D. Koehn, A. Przebindowska and N. NguyenFor better parameter estimation we develop imaging methods that can exploit the richness of full seismic waveforms. Full waveform tomography (FWT) is a powerful method to reach this goal. In this study, we demonstrate the performance of our new parallel a
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Time-domain Elastic Full Waveform Inversion for Transversely Isotropic Media
Authors J. M. Koo, H. Y. Lee, D. J. Min, N. E. Kwak and B. D. KwonIn order to properly describe subsurface velocity structures in anisotropic media, especially transversely isotropic (TI) media, we develop a waveform inversion algorithm based on the 2-D time-domain cell-based finite-difference modeling technique. The ac
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Effect of the Model Dependent Velocity Analysis on the Results of AVO Inversion
Authors L. V. Skopintseva and A. M. StovasAVO analysis is strongly dependent on interpretation of the estimated traveltime parameters. In practice, we can estimate two or three traveltime parameters that require velocity analysis and interpretation within the families of two-parameter or three-pa
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Frequency Domain Bayesian Inversion and Impedance Uncertainty Estimates
More LessInversion of seismic data for elastic properties is now commonly performed throughout the industry in support of a variety of exploration and production applications. However, in areas of reduced data quality or sparse well control, the accuracy of the pa
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Lithology Prediction by Optimizing the EEI Projection
Authors L. Wang, F. Sutherland, N. Philip and B. TaylorIn this paper the EEI (extended elastic impedance) projection technique is used to discriminate lithologies from a land wide azimuth survey. AVO intercept / gradient data are inverted to the impedance domain followed by cross-plotting the extracted seismi
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Bayesian Lithology/Fluid Inversion Constrained by Rock Physics Depth Trends and a Markov Random Field
Authors K. Rimstad and H. OmreIn this study rock physics depth trends and a lithology/fluid Markov random field are used to constrain a 2D Bayesian lithology/fluid inversion. Lithology/fluid classes are defined in a lithology/porosity/fluid space, and a stochastic relation from lithol
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Model Based Inversion for De-risking Prospects
Authors J. W. M. Dankbaar, H. C. Germs, M. J. Seger and G. DrivenesModel based probabilistic inversion has been used for DHI polarization in an exploration setting by prediction of saturation (high or low) and net-sand from seismic. The non-unique problem is addressed by screening possible solutions against the actual se
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Gas Detection from AVO Analysis in Time-frequency Domain
Authors A. Roshandel Kahoo and H. R. SiahkoohiAVO analysis is one of the most commonly used methods for hydrocarbon reservoir exploration specially gas reservoir. In this method changes of amplitude versus offset caused by lithology and fluid content of formation are studied. AVO analysis usually is
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Genetic Seismic Inversion Using a Non-linear, Multi-trace Reservoir Modeling Approach
Authors P. C. H. Veeken, I. Priezzhev and L. ShmaryanSummary: A new reservoir modeling workflow is proposed using a non-linear multi-trace seismic inversion method. A multi-layer neural network algorithm is deployed for the genetic seismic inversion. The method is fast, robust and cost effective. The input
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Peculiarities of the Geological Structure of Balakhani-Sabunchi-Ramana Field
Authors M. A. Efendiyeva, T. U. Baharov and S. T. EfendiyevaThe performed investigations within the recalculation f oil and gas reserves had allowed to make some changes in notion on deep structure of Balakhani-Sabinchi-Ramani fields. It had been determined that in the lower group of PS it had been formed by two u
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Sedimentology and Reservoir Characterization of the South Caspian Pliocene HC Production Unit
More LessDetailed outcrop studies of hydrocarbon bearing Pliocene sediments conducted in Yasamal Anticline in Absheron peninsula (western flank of the South Caspian basin) display a predominant role of depositional setting change in the reservoir architecture and
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Brittle Tectonic Investigations in the North-eastern Part of the Bohemian Massif, Czech Republic
By L. NovákováDetailed structural - geological research was carried out around the Sudetic Marginal Fault, the most important tectonic structure in the NE part of the Bohemian Massif. The fault divides methamophic rocks like crystalline limestones, gneisses and schists
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Structural Controls on the Formation of Coalbed Methane Accumulations in the Donets Basin
Authors V. A. Pryvalov, A. Izart, D. Alsaab, R. F. Sachsenhofer, O. A. Panova and V. A. AntsiferovThe Donets Basin (Ukraine/Russia) contains one of the major coalfields in the Europe. Thermal maturation of concentrated in coal seams and dispersed coaly mass has led to formation of an enormous methane resource. The hydrocarbon system of the study area
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How Seismic Data Improve Geological Models of the Crystalline Basement – Case Study for the Dnieper-Donets Basin, Ukraine
By O. V. VanderA case history of using seismic data to study Precambrian crystalline basement is described. The problem of the crystalline basement geological model creation is considered. It is shown that in the explored area information about the crystalline basement
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The Structure of the Earth's Crust and Prospects of Oil-and-Gas Contents for the Zone of Junction of the Siberian Plate
Authors V. L. Kuznetsov, A. Salnikov and V. MarkovIn the east of continental Russia there are two largest oil-and-gas provinces, namely the West-Siberian plate and Siberian platform. A zone of their junction is over 300 km wide and extends to 2 000 km from south to north covering a vast territory. The pr
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Giant Oil Fields of Kuwait
Authors T. E. H. Esmaiel and A. A. A. Al-QallafThe USGS World Petroleum Assessment1 performed in 2000 is a landmark assessment of the conventional oil and gas resources worldwide. The study provides a starting point to reassessing the potential undiscovered oilfields in Kuwait based on a geological a
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Analysis of Mining-induced Seismicity Using Focal Mechanism and Waveform Computations in Heterogeneous Media
Authors D. Kuehn, H. N. Gharti, V. Oye and M. RothMicroseismic monitoring in mines is a well-established tool used to minimise risk for personnel and to optimise production. Standard monitoring focuses on event locations, but information on detailed source parameters becomes more important. The estimatio
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Diffusivity Estimates from Microseismicity Induced by Nonlinear Fluid – Rock Interaction
Authors N. Hummel and S. A. ShapiroWe consider an impact of a borehole fluid injection on rock permeability. Such fluid operations induce microseismicity. We analyse nature of estimates of hydraulic diffusivity obtained from spatio-temporal behaviour of fluid-injection induced microseismic
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Seismicity Based Reservoir Characterization of Basel Geothermal Site
Authors C. Dinske, S. A. Shapiro and F. LadnerThe hydraulic stimulation of a reservoir is used to enhance its permeability. It is a common technique for developing geothermal energy sites. In 2006, a stimulation experiment has been performed in the city of Basel. Thereby, more than 15,000 microearthq
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Seismic Attribute Analysis of the 3-D Depth-migrated Image and Its Correlation With the Induced Microseismicity
Authors M. S. Jaya, S. Buske, J. Kummerow, A. Reshetnikov and S. A. ShapiroIn this paper the use of seismic attributes calculated from depth-migrated seismic data has been employed. In this work, the seismic data analysis using seismic attributes is encouraging due to its capability to enhance specific geological features which
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Imaging a Thin Reservoir by Active and Passive Seismic
Authors A. L. Vesnaver, G. Boehm and G. RossiThe estimate precision of time origin and hypocenter obtained by the shrinking grid method allows using micro-earthquakes as additional illumination sources for seismic tomography. Their contribution is relevant for thin reservoirs, where picking both top
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Microseismic Event Location Using the Value of the Cross Correlation Coefficient
By J. KummerowWe present a seismic event location procedure that exploits the dependence of waveform similarity on event separation. Given an initial set of precise absolute earthquake locations, the maximum waveform cross correlation coefficients for all possible pair
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Stress-induced Spatial Anisotropy of Microseismicity Distributions
Authors M. Schoenball, T. M. Müller and B. I. R. MüllerWe develop an approach to model microseismicity triggered by fluid injection on the basis of the theory of poroelasticity accounting for the external stress field. Consideration of the fully coupled poroelastic field equations enables us to apply a Coulom
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Estimation of Shear Wave Velocity Profiles by the Inversion of Spatial Autocorrelation Coefficients
Authors K. Firtana and A. KocaogluMicrotremors are measured and analized by spatial autocorrelation method for determination of shear-wave velocity (Vs) models. In spatial autocorelation method,estimating Vs profiles is a two-stage process. Conventionally, Rayleigh wave phase velocity dis
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Small Scale Modeling, a Tool to Assess Subsurface Imaging Methods – Application to Seismic Full Waveform Inversion
Authors F. Bretaudeau, D. Leparoux, R. Brossier and O. AbrahamImaging of the first meters of the subsurface with seismic methods is useful for civil engineering and landscape management. Seismic Full Waveform Invertion (FWI) is an imaging method that offers relevant performances to image heterogeneous media like sub
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Numerical Modeling of Geological Environment Impact on the Pipelines
Authors O. Ivanik, M. Lavrenyuk and V. ShevchukThe general technique of assessment of the stress-strain state of the system “geological environment-pipeline” that is subject to hazardous geological processes has been proposed. It is based on the numerical-analytical algorithms of stresses and displace
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Very Fast Simulated Annealing Surface Wave Inversion with Model Constraints
By M. CercatoGeophysical Inversion is an ill-posed problem that is inherently affected by the non-uniqueness of the solution. Moreover, several peculiar aspects characterize the surface wave inverse problem as the associated forward problem is implicit, modal identifi
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Integrated Geophysical Investigations on the Destroyed Bridges and Roads Sites
Authors M. Yakymchuk, S. P. Levashov, I. M. Korchagin, J. M. Yakymchuk and V. V. PrilukovThe results of the integrated geophysical investigations of engineering-geological conditions on the sites of destroyed bridges and road are given. The carried out researches testify about high productivity of geoelectric and georadar measurements during
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Operative Investigation and Monitoring by Geophysical Methods of Karst Processes Development Areas
Authors D. N. Bozhezha, S. P. Levashov, M. A. Yakymchuk, I. M. Korchagin and J. M. PischaniyThe results of geophysical investigations within zone of intensive development of karst processes are given. The received data show, that a major cause of karstic processes on investigated territory is the presence of a local natural underground water str
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P-wave Attenuation Anisotropy in Fractured Media – Results from a Laboratory 'Scale-model'
Authors A. M. Ekanem, J. Wei, X. Y. Li, M. Chapman and I. G. MainWe used a laboratory scale model to study the effects aligned fractures might have on seismic wave propagation at a larger scale in real Earth imaging. Our main objective was to investigate the effects of aligned fractures on seismic wave amplitude throug
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Time-lapse Attenuation as a Tool for Monitoring Pore Fluid Changes in Hydrocarbon Reservoirs
Authors T. D. Blanchard, R. A. Clark, M. van der Baan and E. LawsAttenuation is a desirable seismic attribute for monitoring hydrocarbon reservoirs as it is far more sensitive to changes in pore saturation and pressure than P- and S-wave velocities. A new method for estimating time-lapse attenuation from prestack data
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The Effect of Attenuation and Velocity Dispersion on the Vibroseis Correlation Process
Authors E. Bongajum, L. F. Sun and B. MilkereitVelocity dispersion and intrinsic attenuation degrade the Vibroseis correlation wavelet. The damage in the correlation wavelet is most severe in low Q environments such as sand dunes, near surface weathering layers, and extensive fracture systems. Time-fr
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Q-absorption Compensation – An Application Study
Authors H. Q. Li, B. Zhao, B. W. Tang, W. C. Wang and H. Y. ZhangAt present, seismic data Q-compensation faces three main issues: estimation accuracy of Q values, compensation robustness including reduction of amplification of background noise, and evaluation of compensation results. In this study, we introduce techniq
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The Influence of Internal Friction on the Elastic Constants
More LessKjartansson constant Q attenuation model was used to show that intrinsic dispersion of seismic velocities in absorbing media is one of the main reasons leading to discrepancies of the rock elastic constants measured by dynamic and static methods. Young's,
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The Reflection Coefficient of a Layer Exhibiting High Attenuation Caused by Interlayer Flow
Authors B. Quintal and S. M. SchmalholzThe interlayer-flow model (1D White’s model) is a physically based model for wave attenuation in the low-frequency range. We use the analytical solution of the interlayer-flow model, and a 1D analytical solution for the frequency-dependent reflection coef
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Evolution Equation for Prestack Depth Migration
Authors A. A. Duchkov and M. V. de HoopMany processes in seismic data analysis and imaging can be identified with solution operators of evolution equations. In this paper, we address the question whether isochrons defined by imaging operators can be dentified with wavefronts of solutions to an
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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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