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EAGE/SEG Research Workshop on Reservoir Rocks - Understanding reservoir rock and fluid property distributions - measurement, modelling and applications
- Conference date: 30 Apr 2001 - 03 May 2001
- Location: Pau, France
- ISBN: 978-94-6282-123-1
- Published: 30 April 2001
21 - 40 of 47 results
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Can seismo-electromagnetic wave conversions be used as an exploration tool?
Authors S. Garambois and M. DietrichWe present field experiments and numerical simulations of conversions between seismic and electromagnetic waves propagating through porous media.
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Permeability prediction from well logs and principal components
Authors P. M. Wong and S. ChoPermeability prediction from welf logs is a challenging problem for petrophysicists. In recent years, neural networks have shown consistently pramising results in field applications. This paper compares the performance of the use of welf logs and their principal components (PCs) as inputs to neural networks for permeability prediction. From the results in a SE Asian reservoir, the study shows that, white the overall performance remains similar, the complexity of the network reduces dramatically with the use of PCs. The findings offer significant insights into the importance of geophysical data preprocessing and selection of algorithmic parameters.
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Application of parallel neural networks in reservoir characterisation from well logs
Authors A. Bhatt, H. B. Helle and B. UrsinA new class of neural networks for quantitative analysis of reservoir properties from well logs is demonstrated in several practical applications. The parallel neural network consists of a number of identical networks (experts) trained on identical or overlapping patterns. We demonstrate that the new artificial neoral network approach is a pragmatic and accurate alternative for converting well data to common reservoir parameters such as porosity, permeability, fluid saturation and for identification of lithofacies. Application to measurement white drilling is feasible.
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Approximate transmission responses for a visco-elastic TIV medium
More LessTransmission effects in the overburden are important for amplitude-versus-offset studies and for tree-amplitude imaging of seismic data. Thin layers produce transmission effects which depend on frequency and slowness. O'Doherty and Anstey (1971) derived a remarkable formula for the transmission response for a plane wave at normal incidente in a stack of homogeneous layers taking into account the direct pulse and short-period multiples.
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Shear-wave splitting and fluid-driven deformation in a critical crust
Authors S. Crampin and S. ChastinAzimuthally varying seismic shear-waves splitting is seen with almost identical characteristics in almost all sedimentary, igneous, and metamorphic rocks below about 1 km-depth in the Earth's crost.
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Amplitude scattering phenomenon - is interface wave propagation guilty?
Authors N. Favretto-Cristini and E. de BazelaireAmplitude scattering, caused by the occurence of thin gaps between layers, is a fractal phenomenon that may generate visible events on seismic sections, correlated from trace to trace but different from usual reflections, although of equivalent energy.
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Poro-viscoelastic representation of shaley sandstones with partial saturation
Authors N. H. Pham, J. M. Carcione, H. B. Helle and B. UrsinBased on a Biot-type formulation of the wave equation we have obtained velocities and attenuation of shaley sandstones with partial saturation. In the limiting case for a pure sandstone the model reproduces the main features of published data on vetocity and attenuation versus saturation.
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Developing stress-monitoring sites
Authors S. Crampin, S. Chastin and P. LearyTheory, laboratory and field evidence reported elsewhere demonstrate that shear-wave splitting monitors the low-level pre-fracturing deformation of the crustal rock which is driven by the response of fluids in cracked rock.
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Shear waves in alternating solid and viscous fluid layers
By B. GurevichExplicit expressions for the frequency dependence of the velocity and attenuation of shear waves in a periodic system of flat solid and viscous fluid layers have been derived by solving exact Rytov's dispersion equation in the long-wavelength approximation. The dispersion and attenuation are related to the well known mechanisms of dissipation in porous media: viscoelastic mechanism (viscous shear relaxation) and visco-inertial Biot's mechanism. The expressions describing the effects of these two mechanisms in a broad frequency range have been derived from the same standpoint. The asymptotic expresslons for various limiting cases coincide with the results of previous studies.
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Hydrocarbon detection via fluid relaxation analysis
More LessIn this work I report on the progress of a novel approach used to determine the presence of hydrocarbons based upon seismic attenuation. By means of numerical modelling, I investigate the possibility of using the viscous fluid relaxation properties of heterogeneous reservoir porous rocks to detect hydrocarbons. The key ideas of this approach are to stimulate the reservoir rocks via a pilot signal and then to quantify the anelastic effects by rneans of tracking waves.
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An experimental and theoretical investigation of the influence of high-frequency acoustic waves on the flow of a liquid through a porous material
Authors S. Barake, F. van der Bas, G. Ooms and P. PoesioAn experimental and theoretical investigation has been made of the influence of high-frequency acoustic waves on the flow of a liquid through a porous material. The experiments have been performed on Berea Sandstone cores.
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The Renormgroup model for fluid flow through the fractal porous media
Authors G. A. Kuz‘min and O. N. SobolevaRocks have a developed porous structure that determines the fuid flows, waves and other proceses in them. It has been recognized that the scale invariant models may approximate the porous structure.
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Critical fractures in a 3km deep well at Soultz (FR) - stronger than friction?
By K. F. EvansWe perform a 'crirical fracture' analysis for the 850 m section of granitic basement exposed below 2.75 km in well GPKI at the Europe an Union's HDR site at Soultz in France.
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Evidence for a critical crust
Authors S. Chastin and S. CrampinWe present evidente that the Earth's trust is a critical system caused by the organisation of fluid-saturated stress-aligned microcracks. A critical crust has profound implications for low-level rock deformation and phenomena such as reservoir description and the build up of stress before earthquakes. Following papers will discuss particular implications and applications.
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Hydrologically-significant structures imaged by induced microseismicity in a 3km deep well in granite at Soultz (FR)
Authors K. F. Evans and R. H. JonesDuring 1993, 25,000m³ of water was injected at a peak overpressure of 9 MPa into a 550 m section of granitic basement exposed below 2.75 km in well GPK1 at the EU's HDR site at Soultz (Rhinegraben) in France.
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Improving reservoir engineering with microseismics
Authors S. Maxwell and T. UrbancicThe efficiency of hydraulic fractures largely determines the economics of tight gas sand reservoirs. Having a reliable method to directly measure hydraulic fracture geometry / orientation and to assess the quality of the created fractures as permeable pathways, allows field engineers to improve cornpletion designs and development strategies for effectave drainage of these reservoirs.
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New data - new models? Downhole microseismic monitoring of a hydraulically fractured reservoir
Authors M. Hartung, M. R. G. Bell, J. F. B. Kraaijevanger and C. MaisonsThis paper discusses the microseismic data recorded during and after a hydrofrac stimulation of a silicilite, oil-bearing reservoir using permanently deployed downhole sensors.
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Time-dependent creep in unconsolidated reservoirs sands above a threshold viscous compaction pressure
Authors P. N. Hagin and M. D. ZobackLaboratory studies of room-dry unconsolidated reservoir sands reveal a time-dependent or viscous component of deformation.
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Permanent passive seismic monitoring for reservoir management - the µSICS™ approach
Authors J. -P. Deflandre, P. Delaplace and F. HuguetPermanent passive seismic monitoring bas been performed since 1993 on the underground gas storage facility located at Céré-la-Ronde (France). This 7-year survey experiment represents a fruitfut experience for the development of equipment and software and for the elaboration of a methodology for both short term and permanent passive seismic survey.
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Pore pressure and fluid detection from compressional - and shear-wave data
By J. DvorkinBy analyzing experimental data we show that in many room-dry rocks, the Poisson' s ratio (PR) decreases with decreasing differential pressure (confining minus pore pressure).
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