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EAGE Conference on Exploring the Synergies between Surface and Borehole Geoscience - Petrophysics meets Geophysics
- Conference date: 06 Nov 2000 - 08 Nov 2000
- Location: Paris, France
- Published: 06 August 2000
41 - 56 of 56 results
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How Can Log and Core Velocity Anisotropy Measurements Improve Seismic Processing
Authors J. Marrauld, L. Pauget, J. Blanco and J. ArnaudB-18 HOW CAN LOG AND CORE VELOCITY ANISOTROPY MEASUREMENTS IMPROVE SEISMIC PROCESSING Summary 1 An elastic Transversely Isotropic with Vertical symmetry axis (TIV) material can be conveniently described by the Thomsen’s theory. Using horizontal and vertical well data drilled in deep offshore deposits a strong anisotropy has been observed in the shaly formations for P and S velocities. These results have been confirmed by core measurements made on vertical and horizontal shaly plugs. ε ranges with depth from 10% to 30% γ reaches 35%. A walkabove has been acquired and processed over the sub-horizontal well. It gives the same range
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Upscaling Well Logs to Seismic Scale – Comparison of a Wavelet-Transform Based Method with a Geostatistical Technique
Authors O. Balz and D. SchlumbergerB-19 UPSCALING WELL LOGS TO SEISMIC SCALE – COMPARISON OF A WAVELET-TRANSFORM BASED METHOD WITH A GEOSTATISTICAL TECHNIQUE A. DOUILLARD D. SCHLUMBERGER O. BALZ Abstract 1 This paper is aimed at pointing out the importance of upscaling well logs in seismic reservoir characterization and presenting a new technique based on the wavelet transform. First an example is given that points out the necessity to perform upscaling of a porosity log in order to compare it with seismic amplitudes in view of characterizing a reservoir. A method based on the wavelet transform is used to carry out this upscaling and is
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Time-Lapse Feasibility Study on a Shallow Marine Sandstone Reservoir Analogue
Authors O. Kirstetter, C. Jones, J. Somerville, P. Corbett and B. SmartB-22 TIME-LAPSE FEASIBILITY STUDY ON A SHALLOW MARINE SANDSTONE RESERVOIR ANALOGUE Abstract 1 An extensive rock physics laboratory study is performed on sandstones of Cretaceous age collected from a mine and used as an analogue for shallow marine sandstone reservoirs. Velocities and porosity relationships with effective stresses are investigated in the case of loosely consolidated sandstone well-cemented sandstone and unconsolidated sand. This allows quantifying the effects of consolidation and cementation on the dry frame elastic moduli for use as input into time-lapse seismic modeling studies. An empirical methodology to compare and extrapolate the elastic moduli to other porosities (outside the
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P-Wave Attenuation – a Plausible Seismic Attribute to Detect Oil and Gas in Venezuela
Authors N. Martin, M. Lopez, M. Donati and A. AzavacheB-25 P-WAVE ATTENUATION – A PLAUSIBLE SEISMIC ATTRIBUTE TO DETECT OIL AND GAS IN VENEZUELA SUMMARY 1 Two 3D field examples from Venezuela about using P-wave attenuation as a plausible seismic attribute for detecting pay zones are shown. First example is from a 3D pilot project in Eastern Venezuelan Basin oriented to improve the image of a deep Miocene oil-prospective turbiditic sandstone reservoir (pay) using RMS P-wave attenuation. It represents a challenge because the structural and stratigraphic complexity in this area and poor well control (a single well W-5). The result analysis shows that P-wave attenuation is more sensitive to
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A New System to Integrate LWD Data with the Earth Model
By I. DowellB-26 A NEW SYSTEM TO INTEGRATE LWD DATA WITH THE EARTH MODEL IAIN DOWELL¹ SCOTT BALL² and SCOT EVANS³ 1 ¹Sperry Sun Drilling Services London UK ²Sperry Sun Drilling Services Houston ³Landmark Graphics Corporation Introduction Reserves are getting smaller and harder to find. When they are found it is ever more important to recover the maximum amount. One place to “find” reserves is in the grey areas between drilling and geoscience. It is often in the improved interaction between them that the best untapped potential exists. On the face of it there are a number of significant technical hurdles. For
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North Sea Chalk Porosity Resolved by Integration of Seismic Reflectivity and Well Log Data
Authors P. Britze, E.B. Nielsen, N. Dahl and S. HaugB-30 NORTH SEA CHALK POROSITY RESOLVED BY INTEGRATION OF SEISMIC REFLECTIVITY AND WELL LOG DATA Abstract A regional study of the Upper Cretaceous – Danian chalk in the Central North Sea based on 2D seismic- and log- data revealed that: • Simplified carbonate porosity units can be resolved in the wells based on gamma ray and sonic logs (GR/DT-logs). • It is possible qualitatively to define areas of porous and tight chalk based on seismic reflectivity. In order to achieve the integration of the seismic and log data to elucidate the reservoir geology of the chalk a simple log-derived GR/DT-lithology
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Combining 4D Seismic and Reservoir Simulation – Key to Effective Reservoir Management
Authors A. Bakulin, N. Drinkwater, C. Signer, S. Ryan and A. O‘DovovanB-31 COMBINING 4D SEISMIC AND RESERVOIR SIMULATION – KEY TO EFFECTIVE RESERVOIR MANAGEMENT Introduction 1 ANDREY BAKULIN¹ NICK DRINKWATER¹ CLAUDE SIGNER¹ SARAH RYAN² and ANDY O’DONOVAN³ ¹Schlumberger Cambridge Research High Cross Madingly Road Cambridge CB3 0EL UK ²Schlumberger-Doll Research ³BP The recent advances in the field of reservoir management in terms of improved visualization increased computing power and increases in the quality and quantity of data collected can often be offset by the key problems of integration and communication among the varied members of an asset team. For example reservoir engineers work with rock and petrophysical properties such as porosity
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Well Seismic Inversion for Prediction under the Bit
By J.E. AcostaB-32 WELL SEISMIC INVERSION FOR PREDICTION UNDER THE BIT JORGE E. ACOSTA A. PDVSA E&P P.O. Box 829 Caracas Venezuela 1 SUMMARY The Corridor Stack and Velocity Profile derived from a Vertical Seismic Profile (VSP) acquired at some intermediate stage of the perforation of a well can be processed and analyzed to obtain a better understanding of the geological model. Inversion of VSP results for a borehole drilled on overthrust structures in the mountain belt of Perija Western Venezuela were analyzed for porosity and hardness values of the rocks to be drilled. The main objective of the well was a
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Incorporation of Seismic Intermediate Scale Data for Rsevoir Modeling
More LessB-33 INCORPORATION OF SEISMIC INTERMEDIATE- SCALE DATA FOR RESERVOIR MODELING Abstract 1 A description of reservoir heterogeneities in all scales is crucial for improvements in reservoir characterization. In this work a multi-scale approach was developed to integrate seismic intermediate-scale data and the conventional short and large scale data represented by logs and surface seismic data respectively. Intermediate-scale data obtained by short and far-offset crosswell surveys vertical seismic profiles and high-resolution seismic lines can be geostatiscally incorporated in this approach in order to provide more complete reservoir descriptions. The approach employs the available seismic data as reference data in order to
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Modeling of Oil and Gas Fields and Exploration Objects in Subsalt Depositions of Precaspian Basin Using Integration of Well Logging, Field Data and Remote Sensing Interpretation
Authors B.S. Korotkov, R.M. Ter-Sarkisov and V.G. FomenkoP-1 MODELING OF OIL AND GAS FIELDS AND EXPLORATION OBJECTS IN SUBSALT DEPOSITIONS OF PRECASPIAN BASIN USING INTEGRATION OF WELL LOGGING FIELD DATA AND REMOTE SENSING INTERPRETATION R.M. TER-SARKISOV V.G.FOMENKO and B.S.KOROTKOV 1 VNIIGAZ Razvilka Lenisky district 142717 Moscow Russia Precaspian region includes several heterogeneous tectonic blocks of earth crust. From North to South these are Precaspian basin developed on the ancient East European platform young epipaleozoic platform Alpine folded mountains of Caucasus. The recent sub-meridional basin of Caspian Sea has its depocenter in Southern Caspian; it overlays unconformably more ancient tectonic structures. Entire Precaspian region is characterized by prolonged
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The Role of Petrophysical Properties in Seismic Interpretation in Miocene Gas-Bearing Formations of the Polish Carpathian Foredeep
Authors J.A. Jarzyna and K. PietschP-2 THE ROLE OF PETROPHYSICAL PROPERTIES IN SEISMIC INTERPRETATION IN MIOCENE GAS-BEARING FORMATIONS OF THE POLISH CARPATHIAN FOREDEEP JADWIGA A. JARZYNA and KAJA PIETSCH Mining and Metallurgy University Department of Geophysics al. Mickiewicza 30 30-059 Kraków Poland Abstract 1 Usually seismic interpretation delivers structural and stratigraphic traps successfully identified and located. Problems with interpretation of seismic sections in sandy-shaly Miocene formations occur in eastern part of the Polish Carpathian Foredeep. There the structural picture yielded by the seismic section does not often agree with the geological arrangement of layers. Hence only correctly done geological interpretation of the seismic wave field
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Layer Matrices for Wave Propagation in Porous Media
Authors G.G. Drijkoningen, M.H. Van Kempen and A.I.M. DennemanIntroduction An important aspect when linking petrophysical data to surface seismic data is the generation of synthetic seismograms from logging data. Nowadays the synthetic seismograms are generated for the geometry as in Vertical Seismic Profiles (VSP) and are then compared to the observed VSP. An assumption in this approach is that the velocities as picked up by the logging instrument are the same as the velocities as picked by the VSP measurement i.e. the velocity is frequencyindependent. In practice however the velocity turns out to be frequency-dependent. At the low frequencies as used in seismic for oil-industry purposes it does
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Application of Medical Computer Tomograph Measurements in 3D Reservoir Characterization
Authors T. Foldes, G. Argyelan, B. Kiss, P. Bogner and I. RepaP-4 APPLICATION OF MEDICAL COMPUTER TOMOGRAPH MEASUREMENTS IN 3D RESERVOIR CHARACTERIZATION Abstract 1 This paper summarizes the benefits of the non-destructive core measurements by medical Computer Tomograph (CT) in the integrated 3D reservoir characterization. A direct relationship exists between CT measurements and petrography conventional petrohysical analysis and well logs. Based on CT measurements internal structure of core samples as well as the geometry of framework constituents porosity type and pore size distribution fracturing can be described. There is close connection between Hounsfield Unit of CT measurements and pore size detected by conventional petrophysical analysis. Calculation of effective porosity from petroleum
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Elastic Wave Attenuation in Transversely Isotropic Media Caused by the Presence of Aligned Saturated Fractures
More LessP-7 ELASTIC WAVE ATTENUATION IN TRANSVERSELY ISOTROPIC MEDIA CAUSED BY THE PRESENCE OF ALIGNED SATURATED FRACTURES ELENA KAZATCHENKO Instituto Mexicano del Petróleo Eje Central Lázaro Cárdenas 152 07730 México D.F. Mexico Abstract 1 A model of a poroelastic medium with a fracture system has been developed. This model is based on Thomsen's theory for weak anisotropy including anisotropy of permeability. The theory is applied to elastic wave propagation at the asymptotic limit of long wavelengths. The model contains a porous homogeneous and isotropic matrix and a system of aligned fractures which have a penny-shaped form. So the composite model presents
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Porosity and Permeability Effects on the Seismo-Electric Reflection
Authors A. Ranada, A.I.M. Denneman and C.P.A. Wapenaar4 Coupling between SH-waves and TE-waves When a horizontally polarized shear wave (SH-mode) propagates in the�-�plane its propagation is not coupled to the other three seismic wavefields (the fast and slow P-waves and the vertically polarized shear wave); however the SH-wave generates electric currents in the�-direction and these currents couple to the electromagnetic wavefield with transverse electric polarization (TEmode). As already shown by Haartsen and Pride (1997) this SHTE-coupling is represented by the set matrix� of differential equations given by Eq. (10). The system in Eq. (10) can be used to determine the velocities of the SH-wave and TE-wave in
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A High-Resolution Seismic Survey on River Maas
Authors S. Tigrek, P. Kiden, R.F. Houtgast and J.M.J. Van KuijkP-11 A HIGH-RESOLUTION SEISMIC SURVEY ON RIVER MAAS S. TIGREK¹ P. KIDEN² R. F. HOUTGAST¹ and J. M. J. VAN KUIJK² ¹ Amsterdam Free University Faculty of Earth Science De Boelelaan 1085 1081 HV Amsterdam The Netherlands ²Netherlands Institute of Applied Geoscience TNO Abstract 1 We present the methodology and the results of a seismic interpretation study aimed at the investigation of the stratigraphical and structural evolution of the Roer Valley Graben (RVG) and a part of the Venlo Peel and Eastern Campine Blocks in the southeastern Netherlands (Figure 1). Our study is based on a high-resolution multi-channel seismic survey
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