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1st EAGE North African/Mediterranean Petroleum & Geosciences Conference & Exhibition
- Conference date: 06 Oct 2003 - 09 Oct 2003
- Location: Tunis, Tunisia
- Published: 06 October 2003
101 - 120 of 162 results
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Influence of Geological Factors on Oil Production in Shallow Marine Reservoirs
Authors O. Kolbjørnsen, A. Skorstad, L. Holden, J. Howell, T. Manzocchi and J. CarterS051 INFLUENCE OF GEOLOGICAL FACTORS ON OIL PRODUCTION IN SHALLOW MARINE RESERVOIRS Abstract 1 Oil production in shallow marine reservoir depends on the complex interaction between the sedimentology and fault properties of the reservoirs and the specific production strategy used in the development. This study addresses the issue of which of these three components has the largest influence on oil production. The data analysed were generated as a part of the EU SAIGUP project "Sensitivity analysis of the impact of sedimentological uncertainties on production forecasting in clastic hydrocarbon reservoirs". In the project factors related to the sedimentological architecture and faulting
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Rejuvenating an Old Field – The Douleb Case History in Central Tunisia
Authors A. Gaaya, M.N. Soussi, R. El Ouahchi and S. KharbachiS052 REJUVENATING AN OLD FIELD – THE DOULEB CASE HISTORY IN CENTRAL TUNISIA 1. Introduction and Summary. 1 The Douleb field located in Central Tunisia some 20 km to the NW of Sbeitla City (Fig.1) is one of the oldest oil fields in Tunisia. Discovered by SEREPT in 1966 it was put on stream in 1968; total cumulative oil production reached 20 Mb in 2002. During its ‘glorious era’ the field produced up to 4700 bopd in 1974 .The last appraisal well DL.15 drilled in 1984 turned out to be dry and since then the activities by the various field
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Example of Integrated Development C137 Block Offshore Libya
Authors H. Silva, X. Mathieu, V. Mogalvy and M. ThuS053 EXAMPLE OF INTEGRATED DEVELOPMENT C137 BLOCK OFFSHORE LIBYA 1 H. SILVA X. MATHIEU V. MONGALVY and M. THU Totalfinaelf E&P Libye Dhat El Imad Complex – Tower 3 13th Tripoli Libya C137 offshore block operated by TotalfinaElf is located in the Sabratah basin at around 100 km from the coast. The main target is the called Metlaoui Group (El Gueria and Chouabine) of Paleogene age corresponding to nummulitic limestones and dolomites. C137 is composed of four fields: A B C and D. A field being a small undersaturated oil accumulation of around 75 Mbbl of oil in place B
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In Salah Gas – First Development in the Ahnet Basin of Central Algeria
Authors E. Robbana, A. Tourqui and C.D. BishopS054 IN SALAH GAS – FIRST DEVELOPMENT IN THE AHNET BASIN OF CENTRAL ALGERIA Summary 1 The In Salah Gas Project (ISG) – a joint venture between Sonatrach and BP – is the first project to develop the gas fields located in the Ahnet-Timimoun basin of central Algeria. This project is key to unlocking the reserves present in this basin and opening up this whole area of Algeria for future development. The project will deliver 9 billion cubic meters per annum (bcm/a) of gas from seven fields (Fig. 1). Development of these fields will be phased with the initial production
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Gas Recycling as the Wisest Technique for a Gas Condensate Field's Development
More LessS055 GAS RECYCLING AS THE WISEST TECHNIQUE FOR A GAS CONDENSATE FIELD’S DEVELOPMENT STUDIED CASE – ABNORMALLY OVERPRESSURED RESERVOIR OF EL FRANIG FIELD SOUTH TUNISIA 1 AUTHOR: RESERVOIR ENGINEER RIM KACEM CO-AUTHOR: SENIOR RESERVOIR ENGINEER RIDHA TRIKI SUPERVISOR: RESERVOIR DEPT. MANAGER TAOUFIK BOUFARES Objective This paper aims to emphasize on the needs and benefits of gas recycling whatever the strategy of a gas condensate field’s development is. Introduction The El Franig field located South of Chott El Jerid was discovered in 1982 and developed only in 1998. The reservoir Ordovician Hamra Quartzite is characterized by poor porosity (~7%) and very
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3D Waterflooding Monitoring with Crosswell EM
More LessS056 3D WATERFLOODING MONITORING WITH CROSSWELL EM 1 MIKE WILT 1 JOHN CORBEN 1 and MIKE MOREA 2 Schlumberger and Chevron have applied the crosswell EM technology for detailed monitoring of a waterflood pilot at the Lost Hills Oil field in Southern California. Using four observation wells in the 2 ½ acre pilot we measured 6 crosswell EM cross-sections in 2001 and again in 2002. The data were collected to evaluate the water distribution after the initial 6 year fracture controlled injection and then examine changes due to a new waterflood design which consisted of tighter well spacing and the
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Miskar Field – The Value of Information
By J. BrownS057 MISKAR FIELD – THE VALUE OF INFORMATION 1 The Miskar Field comprises two producing horizons of Late Cretaceous age the shallowest is the chalk of the Abiod Formation the deepest is the bioclastic limestones of the Douleb Formation. The key reserves uncertainty on Miskar is associated with the deeper reservoir as unlike the Abiod reservoir no hydrocarbon-water contact has been found. Within the Douleb reservoir there are two distinct producing horizons a more massive shallowing up sequence (R1) and a highly interbedded sequence (R1S). 7 wells currently drain the Douleb reservoirs but they are mostly completed in the more
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Quantifying Uncertainty in Depth Conversion and Volumetrics
Authors J. Deraisme and N. JeanneeT001 QUANTIFYING UNCERTAINTY IN DEPTH CONVERSION AND VOLUMETRICS Abstract 1 JACQUES DERAISME AND NICOLAS JEANNEE Géovariances 49bis avenue Franklin Roosevelt 77212 AVON (France) Advanced geostatistical techniques improve the accuracy of depth conversions and resulting volumetric evaluation they can also quantify the associated uncertainties. They have been applied on many Oil&Gas fields around the world. The depth conversion techniques are based on customized kriging methods that make optimal use of all the available data (wells and 2D or 3D seismic). These techniques offer powerful solutions that handle the different relationships between the TVD at the wells (either deviated or vertical) the
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High Frequency Shallow Reflection Seismic as a Substitute for Upholes
Authors M. Dablain, E. Caamano, D. Nelson and K. WollerT002 HIGH FREQUENCY SHALLOW REFLECTION SEISMIC AS A SUBSTITUTE FOR UPHOLES Introduction 1 Pioneer Natural Resources conducted an experiment to see if shallow reflection seismic data could be employed as a suitable substitute for uphole data as part of its 2001-2002 seismic acquisition campaign in the Bazma-Jorf permits in Tunisia. To qualify as a suitable substitute the shallow reflection data would have to provide accurate two-way travel times and depths to known levels within and below the weathering zone at a cost and time comparable to upholes. The shallow seismic reflection data fulfilled these requirements and in addition provided high
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Fast and Crude Re-Datuming of Land Seimic Data
Authors T. Alkhalifah and C. BagainiT003 FAST AND CRUDE RE-DATUMING OF LAND SEISMIC DATA Abstract We formulate an analytical expression of a new prestack operator the Topographic Datuming Operator (TDO). This datuming operator generalizes the operation of static corrections which is very well known in the seismic exploration community and widely used in land seismic data processing. TDO eliminates the essential assumption of vertical incidence to the Earth’s surface of the downward- and upward-propagating reflected wavefield which is not valid in the presence of high-velocity shallow layers and/or large offset-to-reflector depth ratios. The assumptions of equivalent constant velocities for the overburden and beneath the datum
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The Impact of the Overburden Lateral Varying Velocities on El Gueria's Depth Imaging
Authors N. Ayari Saidi, Y. Haddar, T. Zaghouani, F. Messaoudi and M. ElleuchT004 THE IMPACT OF THE OVERBURDEN LATERAL VARYING VELOCITIES ON EL GUERIA'S DEPTH IMAGING Summary 1 N.AYARI SAIDI* Y.HADDAR* DR. T.ZAGHOUANI** F.MESSAOUDI* and M.ELLEUCH** *ETAP 27 bis Avenue Khereddine Pacha 1002 Tunis Belvédère ** Medex Petroleum Ltd : Rue des Entrepreneurs – Zi Aéroport- Charguia2- Tunis Lateral facies and thickness variations within the Eocene and Oligocene formations in the gulf of Gabes (Fig.1) resulted in important variations in the distribution of the average velocity to the top of the main Ypresian El Gueria Nummulitic reservoir. As consequence depth maps derived using constant velocity are plagued with unacceptable errors. The problem
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Imaging Geoelectric Structure of a Volcanic Area Based on Magnetotelluric Measurements
Authors A. Khalil and K. UshijimaT005 IMAGING GEOELECTRIC STRUCTURE OF A VOLCANIC AREA BASED ON MAGNETOTELLURIC MEASUREMENTS Abstract 1 In 1997-1998 a three-dimensional MT survey has been carried out over a volcanic area in Japan called Minami-Noshiro by Japan National Oil Corporation. Minami-Noshiro area is located in the northern part of Akita prefecture northeastern Japan and represents the northwestern margin of the Akita oil field. Many geophysical methods have been applied in this area for hydrocarbon exploration. However information on the electrical resistivity structure at this area has not been revealed. So the aim of MT interpretation is to delineate the distribution of resistivity structure
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Gravity Contributions to Structural Modelling of the Sahel Platform (Tunisia)
Authors J. Dhifi, M.H. Inoubli, M.G. Ben Jemia and S. TligT006 GRAVITY CONTRIBUTIONS TO STRUCTURAL MODELLING OF THE SAHEL PLATFORM (TUNISIA) J. DHIFI 1 M. H. INOUBLI 1 M. G. BEN JEMIA 2 and S. TLIG 1 1 : Unité de Recherche de Géophysique Appliquée Faculté des Sciences de Tunis – 2092 – Tunis – Tunisia e-mail : [email protected] 2 : KUFPEC TUNISIA Ltd - Imm. REGUS (2 ème Etage - Rue du Lac Constance - Les Berges du Lac – 1053 -Tunis- Tunisia Introduction In recent years the main geodynamic and tectonic trends of the Sahel platform were drawn by geological field (Turki 1985; Saadi 1991; Rabhi 1999) and
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New Techniques of Geophysical Surveys Data Processing – The Aeromagnetic Anomaly Map of Italy
More LessT007 NEW TECHNIQUES OF GEOPHYSICAL SURVEYS DATA PROCESSING – THE AEROMAGNETIC ANOMALY MAP OF ITALY Summary 1 We show the reprocessed aeromagnetic anomaly map of the Italian Peninsula and surrounding seas projected at the reference altitude of 2500 m. The data were obtained during the geomagnetic surveys performed by the Italian National Oil Company Agip in the years 1975-1979 together with the new surveys committed by the Geophysical Corporate Services of Eni Exploration & Production Division in the period 2001-2002. We have carried out a detailed re-processing of these data organizing them into a digital database. The processing was done
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Integration and Visualization of Subsurface, Surface and Satellite Data in Southern Tunisia
Authors K.L. Woller, R.S. Garrick and E. CaamanoT008 INTEGRATION AND VISUALIZATION OF SUBSURFACE SURFACE AND SATELLITE DATA IN SOUTHERN TUNISIA Introduction 1 The application of GIS-based visualization techniques to integrate subsurface data surface elevation data and satellite image data has provided new insights into the orientation patterns and amounts of structural deformation in Southern Tunisia. Using these techniques many subtle faults and folds were recognized for the first time. Images of enhanced subsurface seismic horizons provided a tool for re-examining the seismic data for possible faults and their correlation from one line to another. Co-rendering subsurface and surface grids shows the expression of subsurface structure and faulting
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A Comparison of Microbial and Gore Surface Geochemical Surveys in the Jorf Block, Southern Tunisia
By C. KnustonT009 A COMPARISON OF MICROBIAL AND GORE SURFACE GEOCHEMICAL SURVEYS IN THE JORF BLOCK SOUTHERN TUNISIA 1 Acknowledgements: The author would like to acknowledge and thank ETAP Eurogas Corporation Rigo Oil Company Ltd W.L. Gore & Assoc. and GeoMicrobial Technologies for their contributions support and technical review of this project. The opinions and conclusions herein are those of the author and not necessarily of others involved. Introduction: Surface geochemical surveys are considered with some skepticism primarily because of ambiguous results of many surveys that were done in the past. Technology improved considerably in the 1990s and warrants a new look
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Integrated Seismic Data Processing in Hydrocarbon Exploration & Reservoir Studies – A North Africa Perspective
Authors C. Tsingas, M. Raafat and E. SamyT010 INTEGRATED SEISMIC DATA PROCESSING IN HYDROCARBON EXPLORATION & RESERVOIR STUDIES – A NORTH AFRICA PERSPECTIVE Abstract 1 During the last decade seismic data processing has evolved into a process where the contractor and the client are in fully interaction from the beginning to the end of the project. With the advent of immersive multi-volume visualization systems the processing tasks and decision-making can be performed at either the client’s or contractor’s side. In addition the major workload has shifted from conventional to interpretive heavy volume processing requiring extensive quality control at each major processing step. Consequently seismic data processing adds
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Benefit of Seismic Inversion Technology for Reservoir Characterization
Authors J.-L. Piazza and W.B. BeydounT011 BENEFIT OF SEISMIC INVERSION TECHNOLOGY FOR RESERVOIR CHARACTERIZATION Abstract 1 W. B. BEYDOUN & J-L PIAZZA TOTALFINAELF 2 Place de la Coupole – La Défense 6 F-92400 Courbevoie (France) Seismic inversions have grown in the last decade to become efficient techniques for estimating reservoir parameters from seismic data such as porosity volume of clay Net to Gross ratio and/or fluid saturation attributes. The objective of this presentation is to highlight requirements benefits and limits of seismic inversions illustrated by examples from Africa and the Middle East ranging from carbonates to shale/sandstone reservoirs. With the increasing quality of seismic data
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Land Seismic – New Imaging Perspective for Poor S/N and Old Low Fold Data
Authors M. Buia, P. Marchetti and L. SaviniT012 LAND SEISMIC – NEW IMAGING PERSPECTIVE FOR POOR S/N AND OLD LOW FOLD DATA Introduction 1 While the oil industry moves towards new and more challenging environments innovative processing techniques are being developed to successfully deal with uncommon and different problems. The same thing is true when the seismic method is called to face reservoir characterization works that generally require greater accuracy and resolution than exploration ones and that represents an increasing percentage of the seismic jobs around the world. In many case highly prospective areas are covered by low quality seismic data and this is not only due
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Robust, Automatic, Continuous Velocity Analysis
Authors A. Ratcliffe and G. RobertsT013 ROBUST AUTOMATIC CONTINUOUS VELOCITY ANALYSIS Abstract 1 Velocity analysis is one of the key steps in the processing of seismic data. Accurate velocities give rise to an optimal stack response improved reliability of AVO attributes and can also be used as a predictor of geopressure. Consequently a robust fully automatic continuous velocity analysis technique is highly desirable. Starting from the work of Swan (2001) we extend his method for routine use in a production processing environment. We illustrate the success of our new method with results from two case studies. Introduction Manual velocity picking is an expensive task even
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