- Home
- Conferences
- Conference Proceedings
- Conferences
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 - 100 of 585 results
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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,
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
3D Non-linear Anisotropic Diffusion Filtering for Noise Removal and Image Enhancement
More LessIn this paper we present the application of Eni's 3D non-linear anisotropic diffusion filter to 3D depth migrated seismic data. The implementation of the filter is based on the full diffusion equation, i.,e., it supports non-linear, adaptive, and steered
-
-
-
Amplitude-preserving Calibration of PP- and PS-wave Reflection Events
More LessThis paper presents a PP- and PS-wave calibration method based on the accurate estimation of the time-variant velocity ratio. The PS-wave amplitude is then recovered through applying a stretch-correction method. Given an initial VP-to-VS ratio model, we i
-
-
-
High Resolution Acoustic Records for Detection of Main Geohazards in Development of Hydrocarbon Fields in Arctic Seas
Authors I. E. Balanyuk, A. N. Dmitrievsky and S. M. ShapovalovA considerable attention is paid for research with seismic acoustic methods of the modern sedimentation of the Barents Sea region which is important for development of reliable criteria for the sea bed stability. The major processes that controlled a str
-
-
-
Detection and Analysis of Near-surface Layer Effects in Land Seismic Exploration
More LessThe effects of near-surface layers in land seismic exploration had been known long before. However, previous studies mainly focused on statics brought by propagation through near-surface layers (from the kinematics point of view), and only some surface-co
-
-
-
Data Management for Well Complexity Analysis on North Sea Wells
Authors S. Valipour Shokouhi and P. SkalleOne of the most important requirements of any good drilling operation is efficient hole cleaning. Produced particles have to be transported to the surface without leading to other problems. Otherwise, it culminates in difficulties such as tight-hole, pack
-
-
-
Global Hydrocarbon Reserves, Production and Consumption
Authors P. Chungkham and D. ArbouilleDistribution of hydrocarbon remaining reserves, reserves addition, annual production and consumption across the globe by geological provinces, countries and regions shows some interesting and highly imbalance scenarios. Such simple analyses would help in
-
-
-
Improving Data Integration by Means of XML
Authors R. A. Iushchenko, O. K. Iushchenko and V. G. TulchinskyA problem of geoscience end exploration data interoperability is discussed. Modern data exchange formats are mostly based on XML because of its mobility, structure representation power and excellent program interfaces. However, real application data are s
-
-
-
Geographic Information System – An Application to Manage Geophysical Data
Authors M. Giustiniani, A. Accettella, M. Loreto, U. Tinivella and F. AccainoIn this study, we show an application of Geographical Information System (GIS) for managing geophysical data acquired in along the South Shetland Margin (Antarctic Peninsula). The dataset has been acquired in the frame of two projects regarding the integr
-
-
-
Petrophysical Study on Selection of Potential Layers for Hydraulic Fracturing Operation
Authors B. Habibnia and S. R. ShadizadehHydraulic fracturing is a process applied to boreholes to improve the ability of reservoir fluids to flow towards the hole and be recovered. Fractures can play a very important role in the productivity of low permeability formations. Ahwaz oil field is on
-
-
-
Effect of Average Intersection Per Line on Connectivity in Fractured Reservoir, Using Percolation Theory
Authors A. Hashemi, S. Ghorbani and M. MasihiThe knowledge of the connectivity across the reservoir not only helps to find out the potential oil recovery within a particular well configuration but also affects on the other reservoir engineering decisions such as infill drilling. Connectivity also co
-
-
-
An Integrated Geomechanics, Rock Physics and Seismic Model
Authors E. Fjær and T. G. KristiansenA screening tool for simulation of expected 4D seismic effects in connection to a depleting reservoir is described. A few examples of how the model can be used to interpret seismic observations are given. These include the development of traveltime shift
-
-
-
CO2CRC/Otway Project – Influence of Geological and Reservoir Parameters on Expected Time-lapse Seismic Signal
Authors A. Gendrin, M. Urosevic, S. Bouquet, H. Bernth, P. Wisman, D. Labragere and M. VerliacIn the field of CO2 storage, one important goal is to be able to prove that the injected CO2 is safely stored, and that no leak is occurring. Time-lapse seismic is one of the most powerful tools available for this purpose. However, it is generally used in
-
-
-
How Small Is a Small 4D Signal – A Model Study for 4D Resolution
Authors J. H. Y. Yu and J. ThiebaudWith the maturation of 4D seismic, legacy 3D data are replaced by purposely-shot conventional 3D surveys with multiple monitors and short time separation to follow the impact of production. Furthermore, permanent seismic installation like has been proven
-
-
-
Well Performance Analysis Using 4D Seismic
Authors M. Nickel and L. SonnelandIn this paper a methodology is presented that may allow to detect an over-pressured region in the overburden which was induced from an injector well. Increased pore pressure in the overburden results in decreased velocities which may affect the time-laps
-
-
-
A Comparison of Passive Seismic Monitoring of Fracture Stimulation Due to Water Versus CO2 Injection
Authors J. Verdon, S. C. Maxwell and J. M. KendallThe principal observation from passive seismic monitoring at the Weyburn CCS/EOR project has been a very low rate of microseismicity. This has lead to the suggestion that, as CO2 has a higher compressibility, when injected it will have a lower seismic eff
-
-
-
To a Cost Effective Approach for Monitoring CO2 Storage Sites
Authors V. P. Vandeweijer, T. Benedictus, P. L. A. Winthaegen and F. BergenSubsurface storage of CO2 is regarded as one of the options to reduce the impact of human activity on climate change. In order to ensure save, long-term storage of CO2, a storage site has to meet requirements concerning health, safety and environment. Pe
-
-
-
Interpretive Processing – Combining Data Driven Velocity Modelling and Geological Knowledge for Seismic Imaging
Authors J. K. Fruehn, R. Bastia, N. Kettouche and I. F. JonesImaging off the east coast of India poses a specific set of challenges for velocity model building and the migration. Significant topographical variation in the sea bed gives rise to numerous effects which must be dealt with starting with the water veloci
-
-
-
First Arrival Traveltime Tomography for Complex Near-surface Velocity Structures
Authors M. S. Noble, C. Taillandier and H. ChaurisClassical algorithms used for travel time tomography are not necessarily well-suited for handling very large seismic data sets, densely parameterized velocity models and for taking advantage of current supercomputers architecture. We revisit the classical
-
-
-
Channel Tomography
Authors G. Conroy and R. LeggottShallow channels in the North Sea and other areas can present significant problems for PreSDM model building. We present a fully ray-traced tomographic approach to channel modelling that handles multiple offsets and horizons to solve for a laterally-vari
-
-
-
Kinematically Equivalent Factorized Models
By A. M. StovasWithin the framework of factorized model, there is a family of kinematically equivalent velocity models resulting in uncertainties in inverted model parameters and other kinematical characteristics.
-
-
-
Method for Calibrating Seismic Imaging Velocities
More LessAnisotropy can cause large depth errors in images obtained with isotropic velocity analysis and depth migration. Typically, the errors become apparent only where the seismic image intersects a well location, that is, where true depths are measurable. Sp
-
-
-
Effective HTI Model Parameters from Full Azimuth Reflection Angle
More LessWe use residual moveouts measured along continuous full azimuth reflection angle gathers, in order to obtain effective HTI model parameters. The angle gathers are generated through a special angle domain imaging system, for a wide range of reflection angl
-
-
-
Determination of Traveltime Parameters in VTI Media
Authors R. Aleixo, J. Schleicher and J. CostaFor modern long-offset acquisition geometries, a hyperbolic traveltime approximation is no longer sufficient to flatten the CMP gather because of medium inhomgeneity or anisotropy. For transversly isotropic media with a vertical symmetry axis (VTI media),
-
-
-
Moveout Approximation for HTI/VTI Layered Media
More LessAnisotropy in subsurface geological models is primarily caused by two factors: Sedimentation in shale/sand layers and fractures. The sedimentation factor is mainly modeled by Vertical Transverse Isotropy, whereas the fractures are modeled by a Horizontal
-
-
-
Seismic Modelling with Discontinuous Galerkin Finite-element Method – Application to Large Scale 3D Elastic Media
Authors V. Etienne, J. Virieux, N. Glinsky and S. OpertoWe present a Discontinuous Galerkin (DG) finite-element formulation with convolutional perfectly matched layer (CPML) absorbing condition suitable to large scale seismic modelling in 3D elastic media. The issues of performance and load balancing of the pr
-
-
-
qSV-wave Triplications in Multilayered VTI Media
Authors Y. V. Roganov and A. StovasTriplications for qSV-waves are important features of the wave propagation in a transversely isotropic (VTI) medium with vertical symmetry axis. They can create problems for standard seismic processing. We analyze the triplications conditions in the multi
-
-
-
Numerical Simulation of Waves' Propagation in Anisotropic Elastic Media by Lebedev's Grids – RAM Saving and Stable PML
Authors V. V. Lisitsa, E. V. Lys and D. M. VishnevskyThis paper presents Lebedev scheme (LS) for simulation of waves' propagation in arbitrary anisotropic elastic media. This is second order explicit finite-difference scheme on staggered grids and is natural generalization of well known Virieux one used for
-
-
-
3D-3C Seismic Wave Modeling in Multilayered Anisotropic Viscoelastic Media Using the Haskell-Thomson Method
Authors V. Roganov, Y. Roganov and A. KostyukevychA stable method for calculating 3D-3C seismic reflected and transmitted wavefields in a horizontally layered anisotropic viscoelastic medium is derived. It makes use of delta-operators, the sixth-dimensional Stroh formalism and the Haskell-Thomson matrix
-
-
-
The Decomposed Element-Free Galerkin Method for Visco-Elastic Wave Propagation with Wave Scattering Problems
Authors M. Katou, T. Matsuoka, H. Mikada and E. AsakawaWe have developed the Decomposed element-free Galerkin method (DEFGM), a kind of three-dimensional finite-element method for solving wave-propagation problems. We first compared the DEFGM with analytical or reflectivity method for checking the accuracy. T
-
-
-
Wave Propagation Modeling in Viscoelastic Heterogeneous Media with CPML
Authors A. Dhemaied, F. Rejiba, C. Camerlynck, L. Bodet and R. GuérinA 2nd order accurate time, 2nd or 4th order accurate space, 2D P-SV staggered-grid finite-difference scheme is proposed to simulate seismic-wave propagation in unbounded viscoelastic media, for both seismology and engineering applications. The anelastici
-
-
-
Our Experiences of 3D Synthetic Seismic Modeling with Tip-wave Superposition Method and Effective Coefficients
Authors H. B. Helle, M. Ayzenberg, A. Aizenberg, K. D. Klem-Musatov, J. Pajchel and B. UrsinWe show that seismic waves travelling in the subsurface are subject to two physically different processes, namely propagation inside smoothly inhomogeneous layers and reflection and transmission at internal reflectors. We propose a new approach to modelin
-
-
-
Efficient Algorithm for 3D Ray Tracing in 3D Anisotropic Medium
Authors M. Dwornik and A. PietaIn this paper we present efficient algorithm for 3D ray tracing in anisotropic medium using parallel algorithms. Algorithm bases on Fermat's principles and uses grid model of velocity parameters. Arrival time of propagation was calculated only on external
-
-
-
Proxy Models for Unconventional Gas Forecasting and Reserve Analysis
Authors C. Jordan, C. R. Smith, R. Jackson and B. WaeyenCurrently, there is an assortment of reservoir analysis methods ranging from traditional decline and type-curve matching to rate-pressure polynomials and detailed rate-pressure simulation. Yet, despite its many limitations, conventional decline analysis i
-
-
-
Prediction of Fracture Systems with Geomechanical Reservoir Models – Case Study Piesberg
By R. BissenThe detailed documentation of joint systems and their spatial variability are crucial for the optimal exploitation of fractured reservoirs. The extrapolation of well data up to reservoir scale is complex. This study investigates the potential of geomechan
-
-
-
Challenging the Myth of Layercake Stratigraphy of Permian Rotliegend Reservoirs – A Case Study from the P1 Block
Authors V. M. Vernain-Perriot, S. Baffi, A. Moscariello, C. Baunack and G. ParryThis paper describes the results of a reservoir characterisation study of the Rotliegend reservoir in the structure P01-FA located in the western part of the Netherlands sector of the North Sea. Sedimentology, log analysis and high-resolution seismic were
-
-
-
Practical Experience of the Operative Finding, Mapping and Monitoring of Man-caused Gas Pool by Geoelectric Methods
Authors M. Yakymchuk, S. P. Levashov, I. M. Korchagin and B. B. SyniukThe practical experience of experimental application in 2008 of untraditional geoelectric methods of forming short-pulsed electromagnetic field (FSPEF) and vertical electric-resonance sounding (VERS) (FSPEF-VERS express-technology) for the monitoring obse
-
-
-
Tournaisian and Visean Deep Stratigraphic Gas Traps – Example from the MEX/GOL-SV Felds in the Dnieper-Donets Basin
Deep, stratigraphic gas traps in the Dnieper-Donets Basin (DDB), Ukraine, are subject to increased interest and development activities in recent years. 3D time-migrated seismic data processed in 2008, first time access to full well log coverage by means o
-
-
-
Rock Physics Based Prestack Seismic Reservoir Characterization – Application to Thin Bed
Authors Y. B. Guo, Y. J. Zhou, J. Q. Tao, X. H. Zhang and M. QiangIn this paper, we study the Sulige gas field, the largest gas field found so far in China. Reservoir prediction in this area is challenging due to the thin beds and strong heterogeneity. Based on the geological conditions of the main pay zone, we first co
-
-
-
The Giant Azadegan Field, Reservoir Characterization Focused on Sarvak Fm. Reservoirs
Authors B. Mostaghel and Z. AfrassiabianAfter Discovery of three giant fields before Islamic revolution of Iran, in exploration order, Agahhajary, Ahwaz and Marun, one of the most important giant fields which have discovered between 1999 – 2003 in the world, was AZADEGAN. The AZADEGAN field is
-
-
-
Applying Neuro-fuzzy Model to Predict Reservoir Properties from Seismic Attributes – A Case Study in an Oil Field in Iran
Authors M. R. Vasheghani Farahani, M. Nabi-Bidhendi, H. Khoshdel and S. TorabiWe applied neuro-fuzzy model to predict reservoir properties from seismic attributes. We used local linear neuro-fuzzy model tree (LOLIMOT) algorithm to train our model. This model uses well log data and seismic attributes in a well location for training.
-