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66th EAGE Conference & Exhibition
- Conference date: 07 Jun 2004 - 10 Jun 2004
- Location: Paris, France
- Published: 07 June 2004
161 - 180 of 562 results
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Porosity Differentiation within Interbedded Limestone-Dolostone Reservoirs
Authors S.N. Ehrenberg, G.P. Eberli, M. Keramati and A. MoallemiE004 POROSITY DIFFERENTIATION WITHIN INTERBEDDED LIMESTONE-DOLOSTONE RESERVOIRS 1 S. N. EHRENBERG 1 G. P. EBERLI 2 M. KERAMATI 3 AND A. MOALLEMI 3 1 Statoil N-4035 Stavanger Norway [email protected] 2 Comparative Sedimentology Laboratory University of Miami USA 3 Research Institute of Petroleum Industry Tehran Iran We have observed that interbedded limestones and dolostones in 3 deeply buried carbonate platforms have very different porosity frequency distributions with the limestones being tighter and asymmetrically "heaped" against the limit of zero porosity. Comparison with data from younger shallowly buried carbonates suggests that the above contrast originated mainly due to the greater resistance of
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Quantitative Discrimination of Effective Porosity Using Digital Image Analysis - Implications for Porosity-Permeability Transforms
Authors G.P. Eberli, G.T. Baechle, R. Weger and J.-L. MassaferroE005 QUANTITATIVE DISCRIMINATION OF EFFECTIVE POROSITY USING DIGITAL IMAGE ANALYSIS - IMPLICATIONS FOR POROSITY- PERMEABILITY TRANSFORMS Key Findings GREGOR P. EBERLI 1 GREGOR T. BAECHLE 1 RALF WEGER 1 AND JOSE-LUIS. MASSAFERRO 2 1 Comparative Sedimentology Laboratory University of Miami 4600 Rickenbacker Cswy Miami FL 33149 2 Shell International E&P Carbonate Development Team Volmerlaan 8 2280 AB Rijswijk The Netherlands � Five relevant digital image analysis parameters for fluid flow are obtained from 2-D image analysis of carbonate rocks: 2-D image porosity amount of pores pore shape total perimeter per area and dominant pore size range. � Micro-porosity leads to
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Growth, Demise and Dolomitization of Miocene Carbonate Platforms, Marion Plateau, Australia – Results from Sr-Isotope Stratigraphy
Authors S.N. Ehrenberg, J.M. McArthur and M.F. ThirlwallAbstract for EAGE Conference Paris (7-10 JUNE 2004) E007 GROWTH DEMISE AND DOLOMITIZATION OF MIOCENE CARBONATE PLATFORMS MARION PLATEAU AUSTRALIA: RESULTS FROM Sr- ISOTOPE STRATIGRAPHY S. N. EHRENBERG 1 J. M. MCARTHUR 2 and M. F. THIRLWALL 3 1 Statoil N-4035 Stavanger Norway e-mail: [email protected] 2 University College London 3 Royal Holloway University College London Sr-isotope dating of bioclasts and minerals has been used to examine the timing of depositional events and dolomitization in two adjacent carbonate platforms cored by ODP Leg 194 (January-March 2001) on the Marion Plateau just seaward of the Great Barrier Reef Australia (Fig. 1). Because
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Prestack Layerstripping Evaluation – Constant Rotation and Shift Operators in HTI/TTI Media
Authors J.E. Gumble and J.E. GaiserE009 PRESTACK LAYERSTRIPPING EVALUATION: CONSTANT ROTATION AND SHIFT OPERATORS IN HTI/TTI MEDIA Abstract 1 Prestack layer stripping was applied to azimuthally anisotropic (HTI and TTI) synthetic seismic data sets for evaluating constant rotation and shift operators. Equivalent isotropic models were compared to layer-stripped anisotropic models using RMS amplitude and shear-wave splitting time difference maps to quantify and qualify the error. It is found that in HTI media layer-stripped radial and transverse components exhibited incorrect symmetry and orientations and there are significant distortions in the amplitudes that could adversely affect inversion and/or AVO and AVAZ analysis. However layer-stripped PS1 and PS2
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Can We Constrain a VTI Model by Joint Non-Hyperbolic Moveout Inversion of P- and Converted-Wave Data?
Authors B.M. Traub and X.-Y. LiE010 CAN WE CONSTRAIN A VTI MODEL BY JOINT NON-HYPERBOLIC MOVEOUT INVERSION OF P- AND CONVERTED-WAVE DATA ? Abstract 1 For vertical transverse isotropy (VTI) P-wave data alone cannot constrain the vertical velocity and the depth scale of the earth model. Therefore the joint inversion of non-hyperbolic P- and converted wave (C-wave) or S-wave data from long offsets has been suggested. However due to error propagation it has been a point of debate in the literature whether or not the additional C-wave or S-wave data may provide sufficient constraints. Here we carry out a detailed analysis of the accuracy of
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A Velocity Analysis Procedure for Multicomponent Data with Topographic Variations
Authors M.G. Kirtland Grech, S. Cheadle, X. Miao and T. ZhuE011 A VELOCITY ANALYSIS PROCEDURE FOR MULTICOMPONENT DATA WITH TOPOGRAPHIC VARIATIONS Summary 1 We have modified the normal-moveout (NMO) equation for both P-wave and converted-wave (Cwave) data to handle surface elevation changes and we have implemented this equation in our velocity analysis and NMO correction programs. For the C-wave case we have also developed a new velocity analysis method that combines NMO correction and common conversion point (CCP) binning with a set of trial γ (Vp/Vs) values thereby reducing errors introduced by the approximate asymptotic conversion point (ACP) binning method. This procedure has been successfully applied to P-wave and C-wave
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High Resolution Vp-Vs Ratio Estimates from Multi-Component Seismic Data
Authors M. Nickel and L. SønnelandE012 HIGH RESOLUTION VP-VS RATIO ESTIMATES FROM MULTI-COMPONENT SEISMIC DATA Abstract respective pure pressure mode. EAGE 66th Conference & Exhibition — Paris France 7 - 10 June 2004 1 We present a new algorithm to perform seismic event registration enabling an automated calibration of PP and PS seismic sections/volumes. The algorithm is characterized by its multi-resolution and multiattribute approach. The outcome of the process is a PS section stretched to the PP time scale allowing a joint analysis and inversion of the multi-component data set. Furthermore a high-resolution vp-vs ratio volume is generated that can potentially be used as a
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Semi Automatic PP-PS Stereotomography? Application to a Real Dataset
Authors G. Lambaré, J.-L. Boëlle and M. AleriniE013 SEMI AUTOMATIC PP-PS STEREOTOMOGRAPHY? APPLICATION TO A REAL DATASET Abstract 1 The advantages of Stereotomography with respect to standard travel time tomography have been now well established. The fact that the method is based on the picking of locally coherent events is for example of major importance. It allows for a far less interpretative picking where reflected events have not to be associated a priori to given reflectors in the model. The potentialities of Stereotomography for estimating Vp and Vs models from converted waves has been investigated with very encouraging first results. Here we present an application of PP-PS
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Time Migration Velocity Analysis with Anisotropy Applied to PS Seismic Data
Authors G. Etienne and L. NicoletisE014 TIME MIGRATION VELOCITY ANALYSIS WITH ANISOTROPY APPLIED TO PS SEISMIC DATA Introduction 1 Recently intensive efforts have been carried to develop processing workflows for converted S-waves particularly for velocity analysis and time imaging. In all approaches the difficulty comes from the high number of velocity parameters required to obtain flat accurate common conversion gathers. In vertically heterogeneous VTI media Thomsen (1999) showed that the location of the conversion point is asymptotically controlled by the effective dimensionless parameter γeff and at finite offsets also by the ratio γ0 between vertical S and P travel times. The moveout curve is described
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Depth Consistent PP and PS Seismic Angle Tomography
Authors S.-K. Foss, B. Ursin, M.V. de Hoop and A. SollidE015 DEPTH CONSISTENT PP AND PS SEISMIC ANGLE TOMOGRAPHY S.-K. FOSS 1 B. URSIN 2 M.V. DE HOOP 3 AND A. SOLLID 4 Abstract 1 PP and PS depth migration should map key geological horizons to the same depths. These depths should also coincide with the depth points estimated from well logs if such are available. The depth migrated images depend on the elastic parameters defining a background model. These are estimated by minimizing a differential semblance function which requires amplitude-corrected angle-domain common-image gathers to be uniform. That is the migrated events have the same amplitude and depth for each
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Multicomponent Data Interpretation Workflow & PP/PS Joint Inversion – 3D/4C Integrated Study at Eugene Island Block 330, GOM
Authors K. Zou, J. Dai, A. Hannan, A. Koesoemadinata, H. Xu, S. Yang, C. Shih and J. ZimmermanE016 MULTICOMPONENT DATA INTERPRETATION WORKFLOW & PP/PS JOINT INVERSION: 3D/4C INTEGRATED STUDY AT EUGENE ISLAND BLOCK 330 GOM Abstract Multicomponent seismic data add a new dimension for seismic interpretation. In recent years the seismic industry has made significant progress in the acquisition and processing of multicomponent data. The widespread use of multicomponent data however is partly hindered by the lack of interpretation tools and workflows. In particular inversion techniques for multicomponent data are under-developed. 1 In this paper we describe an interpretation workflow for 3D four-component ocean bottom cable (3D/4C OBC) data and discuss the related inversion problems. Key issues
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The Joint Inversion of Gravity Gradient Tensor Components in Linear Inverse Problems
Authors F. Italiano, M. Fedi and I. GoiriE018 The joint inversion of Gravity Gradient Tensor components in linear inverse problems Abstract 1 The present work yields some insights about the simultaneous use of GGT components in linear inverse problems. Independent and joint Gravity Gradient Tensor (GGT) component inversions were performed for a test source in order to better understand the relationship and helpfulness of a jointly inversion. For perfect and noisy data the joint inversion results superior for undetermined problems while independent inversions are valid with evendetermined systems. Introduction Recently measurements and research based on Gravity Gradient Tensor (GGT) have become object of great interest in geophysical
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A Sea Bed Logging (SBL) Calibration Survey over the Troll Gas Field
Authors H.E.F. Amundsen, S.E. Johansen and T. RøstenE019 A SEA BED LOGGING (SBL) CALIBRATION SURVEY OVER THE TROLL GAS FIELD Introduction 1 Remote resistivity sensing of buried resistive layers in conductive sediments a concept called Sea Bed Logging (SBL - Pat. No. US 6.628.119 B1) has been demonstrated both theoretically by Kong et al. (2002) and Eidesmo et al. (2001) and by calibration surveys over a known oil field offshore Angola (Ellingsrud et al. 2002) and the Ormen Lange gas field offshore Norway (Røsten et al. 2003). These surveys were acquired in deep water areas (> 1000 m) to minimize the background return signal from the air-water
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Inversion of SBL Data Acquired in Shallow Waters
Authors R. Mittet, L. Løseth and S. EllingsrudE020 INVERSION OF SBL DATA ACQUIRED IN SHALLOW WATERS Introduction 1 The Sea Bed Logging (SBL) method is described by Eidesmo et al. (2002). The main idea is to use an active source to probe the underground for thin high resistive layers. Hydrocarbon filled reservoirs will typically have a resistivity that is one to two orders of magnitude higher than a water filled reservoir. It will also have a resistivity that is one to two orders of magnitude higher than the surrounding shale or mudrock and this is sufficient to support a partially guided wave that will leak energy up
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Development of a New Magneto-Electrical Resistivity Imaging System
Authors A. Verweerd, E. Zimmermann, A. Tillmann, W. Glaas and A. KemnaE021 DEVELOPMENT OF A NEW MAGNETO- ELECTRICAL RESISTIVITY IMAGING SYSTEM A. Verweerd 1 2 E. Zimmermann 1 A. Tillmann 2 W. Glaas 1 A. Kemna 2 1 A new Magneto Electrical Resistivity Imaging System is proposed which combines measurement of the electric potential and the magnetic field due to a current injection into a probe. For the magnetic field measurements 24 new sensor modules were developed mounted on a vertically moving scanning torus. The system is designed to operate in a typical laboratory magnetic noise environment without extensive shielding and for cylindrical samples. Optimal noise reduction is provided by the
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Full Scale EM Modelling on Sea Ice
Authors H. Hongisto, J. Jokinen, T. Jokinen, H. Säävuori and M. OksamaE022 FULL SCALE EM MODELLING ON SEA ICE Introduction 1 H. HONGISTO J. JOKINEN T. JOKINEN H. SÄÄVUORI and M. OKSAMA Geological Survey of Finland (GTK) P.O.Box 96 FIN-02151 Espoo Finland EM measurements using the STROB - transient electromagnetic system (TEM) and the SAMPO - frequency-domain wide-band electromagnetic sounding system were carried out on sea ice to test the resolution and accuracy of the equipments. For EM-methods sea ice is an ideal place to make test measurements in a simple and well-controlled environment. Also appropriate parameters can be determined accurately enough so that responses to be measured can be easily
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Robust 3D Modeling Algorithm for Borehole and Surface Electromagnetic Applications
Authors B.S. Singer, A. Mezzatesta and T. WangE023 Robust 3D Modeling Algorithm for Borehole and Surface Electromagnetic Applications Abstract 1 B. SH. SINGER 1 A. MEZZATESTA 2 AND T. WANG 2 1 CSIRO Petroleum PO Box 1130 Bentley WA 6102 Australia 2 Baker Hughes 2001 Rankin Rd. Houston TX 77037 U.S.A A new code for modeling electromagnetic fields in complicated 3D environments is based on an integral equation presented in the form used by the Modified Iterative Dissipative Method (MIDM). The integral equation possesses contraction properties that allow the equation to be solved iteratively. A special numerical implementation assures that contraction properties of the equation are preserved
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Sensitivity to Hydrocarbon Targets Using Marine Active Source EM Sounding
Authors R. Weaver, M.J. Tompkins and L.M. MacGregorE025 SENSITIVITY TO HYDROCARBON TARGETS USING MARINE ACTIVE SOURCE EM SOUNDING Abstract 1 Active source EM sounding is a marine surveying technique used for remote detection of sub-surface resistive layers such as hydrocarbons. In order to design a successful survey it is necessary to understand the controls on the EM response and the sensitivity to the target layer. The fundamental effects of target resistivity thickness depth and width are explained together with the implications for choosing frequency and survey design parameters. The relationship between the parameters allows rapid determination of targets appropriate for successful detection and demonstrates the typical operational
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Effects of Vertical Anisotropy on Marine Active Source Electromagnetic Data and Inversions
Authors M.J. Tompkins, R. Weaver and L.M. MacGregorE026 EFFECTS OF VERTICAL ANISOTROPY ON MARINE ACTIVE SOURCE ELECTROMAGNETIC DATA AND INVERSIONS Abstract 1 Recently much effort has been focused on the interpretation of marine controlled-source electromagnetic data for hydrocarbon detection. Of particular importance is the nature of resistivity anisotropy in horizontally-layered sedimentary sequences as this can have a profound effect on recorded electric fields and subsequent data interpretations. In this paper we investigate the effects of vertical anisotropy and demonstrate that recorded electric field amplitudes increase dramatically with increasing subsurface anisotropy. We also show that electrical anisotropy in the overburden has a much greater effect on surface measurements
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Geophysical Study of the Electrical Resistivity at Minami Noshiro Area, Japan
Authors A. Khalil, G. Elqady and K. UshijimaE027 GEOPHYSICAL STUDY OF THE ELECTRICAL RESISTIVITY AT MINAMI NOSHIRO AREA JAPAN Abstract 1 AHMED KHALIL GAD ELQADY AND KEISUKE USHIJIMA AUTHOR Minami-Noshiro oil field is considered as one of the most important oil fields in Japan. A threedimensional magnetotelluric (MT) survey was conducted in this area by Japan National Oil Corporation (JNOC). In this study the magnetotelluric data have been used to image the electrical conductivity of the subsurface in the study area. The used frequency of the MT data was ranging from 0.00055 to 320 Hz. The study of the dimensionality and directionality of the regional electrical structures
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