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63rd EAGE Conference & Exhibition
- Conference date: 11 Jun 2001 - 15 Jun 2001
- Location: Amsterdam, Netherlands
- Published: 11 June 2001
41 - 60 of 516 results
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Integrating Time-Lapse 3D (4D) Seismic Data with Reservoir Simulators
By J. WaggonerF-02 INTEGRATING TIME-LAPSE 3D (4D) SEISMIC DATA WITH RESERVOIR SIMULATORS J. WAGGONER WesternGeco 455 London Road Isleworth Midd'x TW7 5AA UK Abstract Time-lapse 3D or 4D seismic is gaining acceptance as a valuable element of effective reservoir management. When it works 4D seismic can reveal undrained reservoir compartments identify flood front positions and assist the evaluation of potential drilling targets. These are examples of what this presentation refers to as Visual Interpretations of 4D results. Assuming that a 4D result has been obtained (see for example Waggoner 1998) this presentation focuses on the different ways that the 4D result can
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History Matching a Reservoir Model to Time-Lapse Seismic Using the Pilot Point Method
Authors E.M Arenas, T. Oldenziel and C.P.J.W. Van KruijsdijkF-03 HISTORY MATCHING A RESERVOIR MODEL TO TIME-LAPSE SEISMIC USING THE PILOT POINT METHOD E.M. ARENAS 1 T. OLDENZIEL 2 and C.P.J.W. VAN KRUIJSDIJK 3 Summary 1 In this paper we present a semi-automatic history-matching algorithm to constrain our reservoir model to the available time-lapse seismic. The algorithm is tested on a 2D synthetic reservoir for two different scenarios. One case represents a reservoir with extensive production and time-lapse seismic data the other a scenario with limited production data but abundant seismic data. The results show that in the case of extensive production data the inclusion of time-lapse seismic conditioning
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A 4D Seismic Surprise at Gannet B and a Way Forward through Seismically-Constrained, Scenario-Based Reservoir Modelling
Authors M. Bentley and M. HartungF-04 A 4D SEISMIC SURPRISE AT GANNET B AND A WAY FORWARD THROUGH SEISMICALLY- CONSTRAINED SCENARIO-BASED RESERVOIR MODELLING M. BENTLEY 1 and M. HARTUNG 2 Abstract 1 1 TRACS International Falcon House Union Grove Lane Aberdeen AB10 6XU UK 2 Shell UK Exploration and Production Background Gannet B is part of a 7-field cluster operated by Shell Expro on behalf of Shell and ExxonMobil. It is a small (ca.250-300 Bscf) gas field with an uneconomically thin oil rim developed by depletion through two subsea wells. One well is completed on the thick (up to 600ft) Forties sands the other on
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Model-Based Interpretation of Time-Lapse Seismic, Using Stochastic Matching
Authors D. Gawith Ltd. and P. Gutteridge1 F-05 MODEL-BASED INTERPRETATION OF TIME- LAPSE SEISMIC USING STOCHASTIC MATCHING DAVID GAWITH and PAMELA GUTTERIDGE Reservoir Characterization Research and Consulting (UK) Ltd. Introduction The acquisition of 4D seismic surveys is becoming routine practice for operating companies yet the technology available for interpreting the resulting data is in its infancy. Successful studies have been reported (1) (2) and (3); these studies have generally used an approach based on the direct interpretation of differences between data volumes of different vintages. The main difficulty with this approach is that the seismic differences contain (a) noise from various sources and (b) distortion due
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History Matching of Reservoir Flow Models Using 4D Seismic
Authors K. Fagervik, M. Lygren, T.S. Valen, A. Hetlelid, G. Berge, G.V. Dahl, L. Sønneland, H.E. Lie and I. MagnusF-06 HISTORY MATCHING OF RESERVOIR FLOW MODELS USING 4D SEISMIC Introduction 1 Time lapse reservoir data provides the characteristics of change of the reservoir properties over the period of time between consecutive measurements. This data may be obtained using a range of different techniques including data gathered from several independent well measurements seismic data the knowledge of production rate and the gas or water injection rates. However a series of reservoir parameters will remain unknown. The method to be described in this paper aims to estimate some unknown parameters on the basis of time lapse seismic measurements. The estimates will
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Seismic Visualization for Dynamic and Static Reservoir Characterization
Authors C.S. Burns and A. AggioF-07 SEISMIC VISUALIZATION FOR DYNAMIC AND STATIC RESERVOIR CHARACTERIZATION Introduction 1 An integrated reservoir model or shared-earth-model is a vehicle for rendering different data types with an effective property for visual comparison at different scales and in different domains. With the advent of integration ease—providing freedom for creative solutions by seasoned professionals—comes the potential of rapidly relating different inner- and crossdisciplinary data to help gain a better understanding of a reservoir’s current “information state.” This improved understanding allowing then the determination of the technology cost & time appropriate for reservoir characterization using available data and determining the need for additional
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Seismic Attributes, Their Use in Petrophysical Classification
Authors M.T. Taner, J. Walls and G. TaylorF-09 SEISMIC ATTRIBUTES THEIR USE IN PETROPHYSICAL CLASSIFICATION Abstract Since their introduction complex trace attributes have evolved from a simple visual interpretational tool to colorful displays for executives and finally incorporated with other attributes as viable components for petrophysical classification. In this paper we will present a short history of complex trace attributes their classifications based on their utilities and their relationship to rock physics and depositional environment. We show that they can be used in proper combination for lithological or stratigraphic classification by training Neural Networks in supervised or unsupervised settings. We will give several examples to illustrate classification
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From Seismic Facies Interpretation to the 3D Sedimentological Model, Baudroie Field, Gabon - a Case Study
Authors A. Kalna, F. Temple, C. Dumay, T. Lecoq and R. Botton-DumayF-10 FROM SEISMIC FACIES INTERPRETATION TO THE 3D SEDIMENTOLOGICAL MODEL BAUDROIE FIELD GABON – A CASE STUDY 1 A.KALNA F.TEMPLE C.DUMAY T.LECOQ and R.BOTTON-DUMAY TOTALFINAELF Exploration-Production Avenue Larribau 64000 Pau France Summary The Baudroie oil field discovered in 1969 by Elf in offshore Gabon has been re-evaluated in 1997 in order to assess the remaining reserves and the potential for drilling additional production wells. A 2 months seismic stratigraphic study allowed mapping on 3D seismic data sedimentary features that had not been interpreted before and breaking down the Batanga reservoir system into 5 units made of amalgamated turbiditic channels. A
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A Geostatistical Inversion to Flow Simulation Workflow Example - Makarem Field, Oman
More LessF-11 A GEOSTATISTICAL INVERSION TO FLOW SIMULATION WORKFLOW EXAMPLE – MAKAREM FIELD OMAN 1 G. SHANOR 1 M. RAWANCHAIKUL 1 M. SAMS 1 R. MUGGLI 2 G. TILEY 2 and J. GHULAM 2 1 Jason Geosystems Middle East B.V. POB 17729 Dubai United Arab Emirates 2 Petroleum Development Oman LLC. Abstract This paper presents an applied workflow and results of an integrated team effort which included contributions from individual petrophysical geological geophysical and reservoir engineering teams to provide input data for a high resolution geostatistical inversion study of tight gas bearing Pre-Cambrian Buah dolomites and secondarily the overlying Amin sandstones
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Porosity and Porevolume Prediction in a Gas Storage Reservoir
Authors P.T.R. De Beukelaar, C. Aug, B. Coureaud, J.-F. Dutzer and P. LanotteF-12 POROSITY AND POREVOLUME PREDICTION IN A GAS STORAGE RESERVOIR Introduction The aim of any reservoir characterization study is to describe the properties of the reservoir in the appropriate detail. The result is a prediction model of the physical and geological properties of the subsurface. To reach this goal we must integrate spatially distributed seismic data measured in two way time and local informations from wells measured in units of depth. To handle these data of different character and scale a neural network training approach was selected to provide various attribute maps without well (unsupervised) and with well control (supervised)
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The Lithology Cube and Attenuation Cube for Gas Detection
Authors K.B. Rasmussen and J.M. PedersenF-13 THE LITHOLOGY CUBE AND ATTENUATION CUBE FOR GAS DETECTION Summary 1 Gas detection is performed by combined use of the Lithology Cube and attenuation estimation. The Lithology Cube contains lithology and fluid prediction based on seismic data. The method utilises inversion of AVO attribute seismic data to physical properties. The well log data are used as learning data for prediction of rock properties from the AVO inversion results. As the seismic data have been taken to physical properties by the AVO inversion it is simple to use general rock physics knowledge in the rock property prediction. The Attenuation Cube
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Chestnut Well Planning Using Elastic Impedance of 4C Seismic Data
Authors J.E.F. Stearn, A. Castoro and R. BackhouseF-14 CHESTNUT WELL PLANNING USING ELASTIC IMPEDANCE OF 4C SEISMIC DATA 1 J.E.F. STEARN 1 A. CASTORO 2 and R. BACKHOUSE 3 1 Brovig RDS Ltd. Peregrine Road Westhill Business Park Aberdeen AB32 6JL UK 2 Jason Geosystems (UK) Ltd. 3 Premier Oil plc. Introduction The Chestnut Field operated by Premier Oil is located in Block 22/2a some 8 km SE of the Alba Field. The field was discovered in 1986 by the 22/2-5 well and further delineated by 22/2a- 7Z and 22/2a-7Y in 1988. Three other appraisal wells were drilled but all of these failed to find the objective
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Amplitude Extraction in Combination with Seismic Modeling as a Guide for Determining the Depth of the Free Water Level - a Case Study
Authors H.B. De Haan, R.J. Arts and N.G. NeeleF-15 AMPLITUDE EXTRACTION IN COMBINATION WITH SEISMIC MODELING AS A GUIDE FOR DETERMINING THE DEPTH OF THE FREE WATER LEVEL – A CASE STUDY Summary In this paper a case study is presented in which seismic amplitude extraction in combination with seismic modeling reduces the number of possible free-water level (FWL) scenarios to one. Subject of the study is a gas field in the Southern North Sea. In this field different water gradients could be adopted dependent on the wells that are thought to provide reliable pressure information. This would imply that for volumetric calculations different FWL scenarios should be
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Shell's Drive for 4D Seismic
Authors R.K. Staples, J.A. De Waal, R.W. Calvert and M. HartungF-17 SHELL’S DRIVE FOR 4D SEISMIC Introduction 1 In the last 12 months Shell has begun a major effort to incorporate time-lapse reservoir monitoring (of which 4D seismic is an essential element) into the development of a large number of fields. The aim of a global ‘4D implementation thrust’ is to maximise the value extracted from the surveys in terms of saved costs increased / accelerated revenue and improved HSE management. The ‘implementation thrust’ has already shown significant impact over a short period and we discuss some of the activities and the reasons for its success. Push-Pull ‘Traditionally’ time-lapse seismic
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Troll West Time Lapse - Latest News
Authors R.M. Elde, A.N. Haaland and H.E. RoF-18 TROLL WEST TIME LAPSE – LATEST NEWS Introduction The Troll field is located on the north-western part of the Horda Platform. The field is divided by two major curved north-south trending faults which separate the field in three easterly tilted fault blocks named Troll West Oil Province Troll West Gas Province and Troll East. The map in figure 1 shows the Troll West Oil Province and the Troll West Gas Province. 1 Norsk Hydro have since 1995 produced oil from horizontal wells in Troll West Oil Province where the oil column is 22-26m and since 1999 from Troll West
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Oseberg 4 D Study - the Search for Remaining Oil
Authors H. Rutledal, E.T. Ertrevåg and J.I. BergF-20 OSEBERG 4D STUDY – THE SEARCH FOR REMAINING OIL H. RUTLEDAL 1 E. ERTRESVÅG 1 and J.I. BERG 2 Summary The Oseberg Field has currently produced 80% of the initial oil reserves and time lapse seismic is in the process of being used to plan infill wells. A feasibility and pilot study carried out in 1997-1998 showed promising results. The regional changes in the 4D processed datasets from 1992 and 1999 confirm to some extent the reservoir model but show differences in detail. A multiple crossing the main reservoir interval poses challenges in the interpretation. Introduction 1 1 Norsk
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Time-Lapse AVO Inversion in the Nelson Field
Authors D. Davies, L. Hansen, J. Garnham, A. McInally and J. Boyd-GorstF-21 TIME-LAPSE AVO INVERSION IN THE NELSON FIELD L. HANSEN 1 D. DAVIES 2 3 J. GARNHAM 4 A. MCINALLY 4 AND J. BOYD-GORST 5 This abstract represents the views of Odegaard STS and Enterprise only. 1 1 Odegaard A/S 2 Odegaard UK 3 Seismic-To-Simulation Ltd 12 Greenwell Road East Tullos Aberdeen AB12 3AX UK 4 Enterprise UK 5 Enterprise Brazil Introduction This paper presents a method of lithology and porefill prediction based on time-lapse studies of 3D AVO-inverted seismic applied to the monitoring of fluid movements and reservoir characterization in the Nelson field. The data vintages are 1990 (baseline)
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4D-4C AVOA at Teal South
Authors S.A. Hall and C. MacBethF-22 4D-4C AVOA AT TEAL SOUTH STEPHEN A. HALL and COLIN MACBETH Department of Petroleum Engineering Heriot-Watt University Edinburgh EH14 4AS UK 1 Introduction P-P and P-S wave amplitude variation with offset and azimuth (AVOA) effects are studied for the first time in multi-component time-lapse seismic data. The data considered are from the Phase I and II ocean bottom cable (OBC) surveys of the Teal South experiment in the Gulf of Mexico. The objective in this work was to analyse the potential of P-wave and converted wave AVOA to detect time-lapse signatures beyond the resolution of conventional approaches. AVOA analysis
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Monitoring Fractures in 4D Using Microseismic Data
Authors J.-M. Kendall, A.J. Caley, R.H. Jones, O.I. Barkved and P.G. FolstadSummary MONITORING FRACTURES IN 4D USING MICROSEISMIC DATA A. J. CALEY 1 J-M.KENDALL 2 R.H.JONES 3 O. I. BARKVED 4 and P. G.FOLSTAD 4 1 University of Leeds School of Earth Sciences LS2 9JT U.K.� now at Schlumberger Gatwick RH6 ONZ U.K. 2 University of Leeds School of Earth Sciences Leeds LS2 9JT U.K. 3 ABB O shore Systems Limited Rosemanowes Penryn TR10 9DU U.K. 4 BP Amoco Norge A.S. Godesetdalen 8 PO Box 197 4065 Stavanger Norway. Seismic anisotropy in the Valhall eld North Sea is estimated from observations of shearwave splitting in microseismic events. Nearly 324 events recorded
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Integration of High Resolution Borehole Seismic Data with Multi-Component 3D Surface Seismic Data for Cost Effective Reservoir Recovery
Authors E.L. Majer, T.L. Davis, R.D. Benson, G. Li, R.T. Coates, V.A. Korneev and L.A. WalterF-24 INTEGRATION OF HIGH RESOLUTION BOREHOLE SEISMIC DATA WITH MULTI- COMPONENT 3-D SURFACE SEISMIC DATA FOR COST EFFECTIVE RESERVOIR RECOVERY ERNEST L. MAJER 1 THOMAS L. DAVIS 2 ROBERT D. BENSON 2 GUOPING LI 3 1 RICHARD T. COATES VALERIE A. KORNEEV and LAWRENCE A. WALTER 1 Lawrence Berkeley Lab 1 Cyclotron Road Berkeley CA 94720 USA 2 Colorado School of Mines 3 Schlumberger Currently there is a critical need to increase the recovery from existing and new reservoirs. Water flooding and tertiary recovery operations using such methods as hydrofracturing steam and/or CO2 injections are all being used in a
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