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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
21 - 40 of 585 results
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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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