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65th EAGE Conference & Exhibition
- Conference date: 02 Jun 2003 - 05 Jun 2003
- Location: Stavanger, Norway
- Published: 02 June 2003
61 - 80 of 487 results
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Preconditioning for Optimal 3D Stratigraphical and Structural Inversion
Authors T. Randen, L. Sønneland, A. Carrillat, T.S. Valen, T. Skov, S.I. Pedersen, B. Rafaelsen and G. Elvebakk1 B-28 PRECONDITIONING FOR OPTIMAL 3D STRATIGRAPHICAL AND STRUCTURAL INVERSION Tectonic forces bend and tilt the earth’s crust and thereby create many of the structures under which we find hydrocarbons. However the bending and tilting also present a challenge to attribute computation and automated interpretation of the seismic data. Nevertheless local dip information is a crucial element in seismic stratigraphic internal reflection configuration [1]. Hence a robust seismic attribute should be able to handle dipping layers in a consistent way. For example the traditional approach of extracting attributes along vertical traces irrespective of any dipping nature of the data clearly
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Using Wavelet Transform and Self Organizing Maps for Seismic Reservoir Characterization of a Deep-Water Field, Campos Basin, Brazil
Authors P.L.M. Osório, M.C. Matos and P.R.S. JohannB-29 USING WAVELET TRANSFORM AND SELF ORGANIZING MAPS FOR SEISMIC RESERVOIR CHARACTERIZATION OF A DEEP-WATER FIELD CAMPOS BASIN BRAZIL Introduction 1 Seismic facies analysis is not a deterministic and simple task. Usually facies analysis is performed through the following steps [1]: 1- Geological oriented spatial and temporal segmentation of seismic traces (input space); 2- Seismic attributes selection (variable space); 3- Choosing the optimal number of classes (facies) and algorithm iterations; 4- Training and classification of the selected attributes using some statistical or neural networks methods (pattern space); 5- Building and interpreting facies map. Normally the geological oriented spatial and temporal
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Multiple Attribute Analysis for a Jurassic Oil Field in the North Sea
Authors F. Barclay and D.J. DaviesB-30 MULTIPLE ATTRIBUTE ANALYSIS FOR A JURASSIC OIL FIELD IN THE NORTH SEA Summary: 1 Multiple-Attribute analysis (MAAT) has been applied for a Jurassic (Brent Sequence) field in the UK North Sea to help define the remaining oil in the reservoir section after several years production. 3D seismic from 1997 was used in this study. Both full-stack acoustic impedance (AI) inversion and AVO-inversion were used to provide precise well-ties between the attributes and lithology/fluid units defined from logs. Neural net modeling enables prediction of (1-Sw) and porosity volumes that may be combined to predict high remaining pay potential. Method: An
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Fault System Analysis Using a New Interpretation Paradigm
Authors T. Skov, S.I. Pedersen, T.S. Valen, P. Fayemendy, A. Grønlie, J.O. Hansen, A. Hetlelid, T. Iversen, T. Randen and L. SønnelandB-31 FAULT SYSTEM ANALYSIS USING A NEW INTERPRETATION PARADIGM Abstract 1 Based on two field examples from offshore Mid Norway a new fault interpretation paradigm is presented. The paradigm allows the user to apply principles from structural geology to analyze fault systems and it reduces significantly the subjectivity inherent in manual interpretation. This is especially valuable for the main data example presented which is structurally complex area with a dense network of faults. The final analyzed result from this data set is considered as a detailed and a reasonable objective 3D fault interpretation. Introduction T. SKOV 1 S. I. PEDERSEN
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Seismic Mapping of « Infra-Tuning » Reservoir Objects by a Geology Driven Classification Approach
Authors F. Pivot, G. Bailly, F. Bertini and D. ClaudeB-32 SEISMIC MAPPING OF « INFRA-TUNING » RESERVOIR OBJECTS BY A GEOLOGY DRIVEN CLASSIFICATION APPROACH Abstract 1 Most geophysicists think that it is impossible to recover some reservoir property if this property is associated with layers under tuning thickness. It is true when using amplitudes only but becomes sometimes false when amplitudes are analysed as waveforms in pre-stack domain combined with apriori geological constraints. The developed methodology in this paper applies this more subtle reality: it allows to recover the Hydrocarbon Pore Thickness of a thin sheet complex of deep-offshore Angola and proposes a confidence interval at each point of
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Real Data to Real Decisions in Real Time
More LessB-33 REAL DATA TO REAL DECISIONS IN REAL TIME Abstract Exploration and production is one of the most information intensive activities in business. Over the last decade considerable effort has been devoted to improving the management of E&P information and many companies now have corporate data stores populated by validated high quality E&P data. Recently new techniques have been employed to make data more timely and accessible to E&P professionals and managers while adding context to data so we can make business decisions better and faster. 1 EAGE 65th Conference & Exhibition — Stavanger Norway 2 - 5 June 2003
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Real-Time Dataflow in the ConocoPhillips Norge Onshore Drilling Center
Authors L. Gåseby, M. Herbert and J. PedersenB-34 REAL-TIME DATAFLOW IN THE CONOCOPHILLIPS NORGE ONSHORE DRILLING CENTER 1 LARS GÅSEBY MIKE HERBERT and JARLE PEDERSEN Abstract In 2002 ConocoPhillips Norway implemented an Onshore Drilling Center in their main onshore facility in Norway. This center is used to support not only drilling operations on the Eldfisk and Ekofisk fields but also well trajectory planning. Key elements of the center are “real-time data” “collaborative work processes” and “integrated data views”. This presentation will review the recent history and background that lead up to the center: • Main drivers • Scope • Infrastructure • Supported work processes Furthermore a close
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Developing Sub-Surface Work Processes to Exploit Real-Time Data – Experiences from the Heidrun Field
By A. McCannB-35 DEVELOPING SUB-SURFACE WORK PROCESSES TO EXPLOIT REAL-TIME DATA - EXPERIENCES FROM THE HEIDRUN FIELD 1 Production and injection wells on the Heidrun Field are drilled from a 56-slot template below the TLP plus five 4-slot sub-sea templates. Drilling from the platform template has been continuous since 1993 which together with periodic sub-sea drilling has meant that up to 16 wells have been drilled per year. After 7 years of production many wells now being drilled are high-angle infill wells requiring precision placement in the reservoir. In 2000 the Heidrun sub-surface team introduced a Statoil-developed data transfer system (DART Link)
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Effective Management of Production Data for Corporate Value in a Dispersed Environment
Authors A.H. Smith, H. Banister and S.J. RobertsB-36 EFFECTIVE MANAGEMENT OF PRODUCTION DATA FOR CORPORATE VALUE IN A DISPERSED ENVIRONMENT Summary 1 The collection of escalating volumes of data characterise the current E&P industry. It is essential that this be managed so that the data supports the requirements of the corporation. In the case of production data these needs are rapidly changing as “real time” information is gathered to help with field management. Experience shows that within most companies the advent of real time data delivery is exposing weaknesses in current processes that need to be addressed to ensure the accuracy and speed of reporting both in
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Using WITSML for Distributing and Managing Real-Time Data
By Ø. MydlandB-37 USING WITSML FOR DISTRIBUTING AND MANAGING REAL-TIME DATA Abstract Summary 1 The WITSML standard provides a new Information Transfer Standard that gives real-time seamless flow of well site data between operators and service companies to speed and enhance decision-making within Drilling Completion and Well Services. Sense Technology has developed SiteCom which use WITSML for distributing and managing real-time data. SiteCom has been in operation in BP Stavanger since October-02. The WITSML project is an oil industry initiative sponsored by BP Statoil and Shell to define a new standard for drilling information transfer. Initial participation is from the major service
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Oil and Gas Exploration and Production Portals – Present and Future
Authors D. Camden and P. CleverleyB-38 OIL AND GAS EXPLORATION AND PRODUCTION PORTALS – PRESENT AND FUTURE 1 Aim To discuss the business requirements which have led to the existing array of portals (and associated terminology) used within the Oil & Gas Exploration and Production Industry. A classification model for current portal ‘types’ will be proposed according to shared characteristics enabling companies to clarify the position of their existing developments and develop a shared understanding of the current industry environment. A strategic approach towards information management will be presented to equip the portal of the future with the structure it needs to meet future business
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Web Technologies for Information Access and Workflow Support – Technical Workspace Portals
Authors U. Algan and M. PiantanidaB-39 WEB TECHNOLOGIES FOR INFORMATION ACCESS AND WORKFLOW SUPPORT – TECHNICAL WORKSPACE PORTALS Abstract 1 UGUR ALGAN 1 and MARCO PIANTANIDA 2 Since the early beginnings in 1997 Web-enabled technologies have grown to become as much a part of our daily lives as the telephone and the television. A significant percentage of the world's population today relies on the Web for a variety of information and services. Although the impact of the Web technologies on us the consumers is significant it is even more so in the workplace. The main focus of this presentation is technical workspace portals for the
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A New Approach for Discovering, Exploring and Exploiting Exploration Data over Intranets and the Internet
Authors A. Johnson, T. Wilson, R. Tinnion and T. NgwisanyiB-40 A NEW APPROACH FOR DISCOVERING EXPLORING AND EXPLOITING EXPLORATION DATA OVER INTRANETS AND THE INTERNET Abstract 1 T. WILSON 1 R. TINNION 2 A. JOHNSON 3 and T. NGWISANYI 4 The Internet Intranets and general globalization of networking technology have produced a dramatic increase in the type and volume of digital exploration data that is available to geoscientists. The development of useful protocols for computers to access and share the data both privately within an organization and globally on the Internet is key to our ability to use this information efficiently. Current barriers include insufficient bandwidth for large data
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The Search for Interbed Multiples Using a Model Based Approach
Authors C.J. Tsai and D.R. SedgeleyB-41 THE SEARCH FOR INTERBED MULTIPLES USING A MODEL BASED APPROACH Summary 1 One of the problems in seismic interpretation is the presence of multiples. Unlike marine acquisition where surface multiples are the dominant noise land data has predominant interbed multiples. As exploration and development focuses on deeper reservoirs multiple interference becomes increasingly significant and frequently makes the interpretation of seismic data ambiguous. To identify these deep multiple generators a model-based approach has been developed. The method consists of four steps: (1) well log blocking and model creation (2) synthetic seismogram generation (3) layer stripping and (4) identification of multiple
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Enhanced Post-Stack Multiple Prediction Using Demigration
Authors M.S. Al-Bannagi and D.J. VerschuurB-42 ENHANCED POST-STACK MULTIPLE PREDICTION USING DEMIGRATION Abstract 1 The theory of surface-related multiple removal has been developed for pre-stack data. However for laterally smooth media the method can be approximated in the post-stack domain. Although less accurate it makes the application very fast and easy to apply in many practical situations especially for low-relief structures. The objective of the proposed method is to combine the advantages of both approaches: the robustness and efficiency of the poststack domain with the accuracy of the pre-stack domain. In this method the zero offset prestack multiple prediction result is calculated from demigrated post-stack
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It's Magic – Industry First 3D Surface Multiple Elimination and Pre-Stack Depth Migration on Ormen Lange
Authors G. Kleemeyer, S.E. Pettersson, R. Eppenga, C.J. Haneveld, J. Biersteker and R. den OudenB-43 IT’S MAGIC – INDUSTRY FIRST 3D SURFACE MULTIPLE ELIMINATION AND PRE-STACK DEPTH MIGRATION ON ORMEN LANGE Introduction 1 The giant Ormen Lange field is the first commercial deepwater discovery in Norway. Discovered in 1997 the field is the second largest gas discovery offshore Norway. The field is located about 100 km west of the coast of Møre in water depths of about 1000 m. Situated underneath the huge Storegga slide that happened 8000 years b.p. the development of Ormen Lange faces tremendous challenges. Norsk Hydro operates the Ormen Lange development and Norske Shell is the designated operator for the
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Multiple Prediction and Subtraction – An SRME and IME Case History
Authors D. Ellis and R. van BorselenB-44 MULTIPLE PREDICTION AND SUBTRACTION – AN SRME AND IME CASE HISTORY Summary 1 Surface-related multiple elimination (SRME) and internal multiple elimination (IME) were applied to a 2D line extracted from a marine 3D dataset. Results were compared with those obtained from parabolic Radon filtering. Owing to the complex 3D geological environment the multiples’ indistinct nature their uncertain origin and the relatively poor dip contrast with the primary reflections it has proven to be a challenge to judge the accuracy of the predicted multiples and in particular the effectiveness of the adaptive subtraction of the multiples predicted through SRME and
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An Evaluation of Peak and Bubble Tuning in Sub-Basalt Imaging – Modelling and Results
Authors Z.C. Lunnon, P.A.F. Christie and R.S. WhiteC-01 AN EVALUATION OF PEAK AND BUBBLE TUNING IN SUB-BASALT IMAGING - MODELLING AND RESULTS Summary 1 Z. LUNNON 1 P. CHRISTIE 2 and R. WHITE 1 1 Bullard Labs Madingley Road Cambridge CB3 0EZ UK 2 Schlumberger Cambridge Research As part of the iSIMM project (White et al. 2002) a 6 360 in 3 airgun source array was used to shoot twice a deep seismic profile into a 380 km array of Ocean Bottom Seismometers (OBS) east of the Faroe Islands. The first pass used peak tuning and the second used bubble tuning with other source parameters constant. The
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Improved Imaging by Pre-Stack Depth Migration of Multi-Azimuth Towed Streamer Seismic Data
More LessC-02 IMPROVED IMAGING BY PRE-STACK DEPTH MIGRATION OF MULTI-AZIMUTH TOWED STREAMER SEISMIC DATA Summary 1 STIAN HEGNA and DOROTHEE GAUS EAGE 65th Conference & Exhibition — Stavanger Norway 2 - 5 June 2003 PGS Geophysical Oslo Norway Seismic imaging is a major challenge over the Varg Field in Block 15/12 offshore Norway due to complex salt structures and a high velocity Chalk layer above the target levels. The original 3D survey covering the Varg Field has been processed many times to try to improve the quality of the seismic data. In spite of all the processing attempts seismic imaging remained
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Repeatability Enhancement in Deepwater Permanent Installations
Authors A. Bertrand and C. MacbethC-03 REPEATABILITY ENHANCEMENT IN DEEPWATER PERMANENT INSTALLATIONS Summary 1 Seawater velocity variations can have a significant impact on the repeatability of frequently acquired time-lapse seismic data. Here this effect is assessed by processing modelled data based on a real hydrocarbon reservoir in the West of Shetlands. The repeatability metrics calculated for synthetic seabed data perturbed by realistic seawater velocity variations indicate poor seismic repeatability. The data are then corrected in the shot domain according to a new method which removes the dynamic traveltime differences for each trace. After correction the distortions caused by the water changes are virtually eliminated. We
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