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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
1 - 100 of 162 results
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2D Seismic Interpretation and Hydrocarbon Potential of Concession NC7, Ghadames Basin, NW Libya
More LessP001 2D SEISMIC INTERPRETATION AND HYDROCARBON POTENTIAL OF CONCESSION NC7 GHADAMES BASIN NW LIBYA 1 MOHAMED A. ABDULLAH (PETROLEUM GEOLOGIST) Arabian Gulf Oil Company P.O Box 263 Summary This study focuses on the northeastern Concession NC7 situated in southeastern quarter of the Ghadames Basin Northwest Libya. In the period between 1959 and 1985 gas and oil shows were encountered in this area and commercial hydrocarbon exploration has continued at certain reservoir levels. However no commercial hydrocarbon discovery has been made within certain other reservoir levels. This study sets out to locate any T.W.T structure closure at reservoir horizons; to use
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Hydrocarbon Source Rock Quality, Distribution and Migration in the Northwest Sirt Basin, Libya
Authors M.Y. Baair, I. Rabti and P.H. SwireP002 HYDROCARBON SOURCE ROCK QUALITY DISTRIBUTION AND MIGRATION IN THE NORTHWEST SIRT BASIN LIBYA Abstract 1 MUSTAFA.Y. BAAIR I. RABTI & P.H. SWIRE Geology Department Veba Oil Operations PO Box 690 Tripoli Libya The area of study represents the northwestern Sirt Basin and its overlap with the Ghadames Basin. Recent exploration efforts have focused on Concession 10 which is at the centre of the study area. Two wells have been drilled on the concession. The A1-10 well had only minor oil shows (poor fluorescence) that were recorded from near the top of the Kalash Formation. The B1-10 well tested oil
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Techniques and Benefits of Combining Seismic Manipulation with Cross-Section Restoration
More LessP003 TECHNIQUES AND BENEFITS OF COMBINING SEISMIC MANIPULATION WITH CROSS- SECTION RESTORATION 1 DAN HODGE DELPHINE ROQUES and STUART BLAND Midland Valley Exploration Ltd. 14 Park Circus Glasgow G3 6AX United Kingdom Fault and horizon correlation on restored seismic enables validation of the geohistory within the context of the seismic data. Critically further interpretation can be carried out on restored seismic panels to bring out a level of detail and confidence in stratigraphic and sedimentary interpretations which may otherwise be difficult or impossible to make. Use of sequential restorations of the geohistory carrying the full information available in the seismic
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Potentiality of Jurassic Play in Ali Ben Khalifa Prospect, Tunisia
By M. ChaabouniP004 POTENTIALITY OF JURASSIC PLAY IN ALI BEN KHALIFA PROSPECT (TUNISIA) 1 STRUCTURE The Ali Ben Khalifa prospect is located in coastal plane 60 km South -West of Sfax city. It is a positive gravity anomaly confirmed as a fractured anticline by seismic data. Near the top of the Jurassic Nara Formation the structure has 30 sq. Km of closure and about 500 m of vertical closure. The Ali Ben Khalifa prospect is explored by two wells (ABK -1A and ABK –2). Before drilling the main target was to explore Lower Cretaceous Jurassic and Middle Triassic reservoirs. RESERVOIRS AND SEALS
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Upper Cretaceous Fractured Reservoir – M'Sela Prospect
Authors A. Ben Ferjani, A. Ouachi, H. Ghariani and M. El EuchP005 UPPER CRETACEOUS FRACTURED RESERVOIR – M’SELA PROSPECT STRUCTURE 1 The M’sela prospect is located in eastern offshore Tunisia in a water depth of 80 m along the southern flank of the Louza block approximately 170 km to the east of Sfax coastal city and 14 km north of the Isis oil field. The M’sela prospect is a structural/stratigraphic anomaly explored by one well (M’sela-1). Prior to drilling it was thought this mounded anomaly is a Paleocene reefal buildup. The M’sela –1 well proved that is a thick complex of Upper Cretaceous fractured volcano-sedimentary rocks draped by a thin senonian
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Palaezoic Petroleum Systems in the Ghadamis Basin, Libya
Authors A.M. Dardour, D.R.D. Boote and A.W. BairdP006 PALAEOZOIC PETROLEUM SYSTEMS IN THE GHADAMIS BASIN LIBYA 1 Summary The intra-cratonic Ghadamis Basin of NW Libya (Fig. 1) contains a significant amount of basal Silurian (Tanezzuft Formation ‘hot’ shale) sourced oil and gas in Ordovician Upper Silurian (Acacus Formation) basal Devonian (Tadrart Formation) Middle-Upper Devonian/Lower Carboniferous and basal Triassic sandstones. Three petroleum systems have been recognized: • The Acacus-Tanezzuft System to the north in fault and subcrop traps A.M. DARDOUR D.R.D. BOOTE and A.W. BAIRD Kingston University Kingston upon Thames Surrey KT1 2EE United Kingdom • A central basin Tanezzuft-sourced system with Upper Silurian Devonian and Lower Carboniferous
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Hydrocarbon Potentiality of the Egyptian Red Sea
By M. TammamP007 HYDROCARBON POTENTIALITY OF THE EGYPTIAN RED SEA 1 DR. TAMMAM MOHAMED TAMMAM Egyptian General Petroleum Corporation Red Sea is Oligocene / Miocene rift basin which might be set up due to the break-up of the basement blocks and then as a result of separation of African Craton from Arabia block. The early initiation of rifting and uplifting of rift shoulder sediments might be started in the Eocene/Oligocene . The second phase of rifting is within Middle Miocene and it may be currently active. The subsurface data enable to assess and clarify the stratigraphic and tectonic peculiarities of the area
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The Tanger-Rabat Segment, Northern Morocco, a Promising Zone for Hydrocarbon Exploration
More LessP008 THE TANGER-RABAT SEGMENT NORTHERN MOROCCO A PROMISING ZONE FOR HYDROCARBON EXPLORATION Abstract 1 The Tanger-Rabat segment constitues the northern extension of the Moroccan Atlantic Basins. This area located at the eastern Atlantic margin is developped in the junction between the Western Moroccan Rif and the Spanish Betic alpine chains. Sedimentary deposits within this zone resulted essentially from the relative sea level changes during the complex successive tectonic phases of continental collision and plate divergence inducing the deposition of various and complex sedimentary series. The synrift serie was dominated by red beds and evaporites deposits within grabbens and half grabbens
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Petroleum Geology of the East Mediterranean
By E. BremanP009 PETROLEUM GEOLOGY OF THE EAST MEDITERRANEAN Abstract 1 An assessment is made of the exploration potential of the East Mediterranean using new 2D seismic and public data. With respect to the Mesozoic the area is divided in a southern sandstone-carbonate province and a central-northern carbonate province. The Tertiary includes Oligo-Miocene continental and turbidite sandstones on the continental margins and on the flanks of the northern thrust belts (in analogy with the Kyrenia Range of Cyprus). Late Messinian fluvial and Pliocene submarine fan sand plays are present in the south and along the coast of the Levant. The three main
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West Delta Deep Marine, Offshore Nile Delta - Aggressive Exploration Program Commercialized in ELNG
By N. SteelP010 WEST DELTA DEEP MARINE OFFSHORE NILE DELTA – AGGRESSIVE EXPLORATION PROGRAM COMMERCIALIZED THROUGH ELNG Sixteen E&A wells have been drilled between 1998 and 2002 in the West Delta Deep Marine concession with a 100% success rate. The concession located in the Egyptian deepwater Nile Delta was awarded to BG and Edison Gas in 1995 and is now operated by Rashpetco on behalf of the Burullus Gas Company (a joint venture company formed by BG EGAS and Petronas – replacing Edison) where the success story continues with an aggressive technology-enabled exploration and development program. 1 NICK STEEL 1 and MOHAMED
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The Rif Domain-Inversion Effects on Petroleum Systems
Authors F. Charrat and M. El AljiP011 THE RIF DOMAIN-INVERSIONEFFECTS ON PETROLEUM SYSTEMS Abstract The scope covers the Rif and the Atlas Belts with the adjoining Eastern Meseta. 1 After Triassic-Liassic Rifting Alpine Inversion occurred due to African and European Collision. Subsequently the Rif in the North was thrusted southward along Salt Decollement Surface. This formed numerous duplexes and imbricate structures that provide folds and sub thrust traps. The Atlas troughs were inverted into intracontinental chains with low-angle thrust traps along the edges of this chain. In the Meseta decollement within upper Salt created Jurassic structures decoupled from Paleozoic-Triassic ones. This inversion caused Jurassic facies exposure
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Thrust Geometry and Kinematic Relationship with Tectonic Inheritance in Northern Tunisia
Authors M.A.O. Bagga and S. AbdeljaouadP013 THRUST GEOMETRY AND KINEMATIC RELATIONSHIP WITH TECTONIC INHERITANCE IN NORTHEN TUNISIA 1 M.A.O. BAGGA1 AND S. ABDELJAOUAD1 1Faculté des Sciences de Tunis Département de géologie Campus universitaire 1060 Tunis Tunisia Summary The geologic and multiscale tectonic study of Ghardimaou-Fernana outcrops has permited to restore the early Miocene SE verging ramp and flat thrust system geometry which have been complicated by later shortening events. The occurrence of ramp folds are closely linked to faults which have regulated the Mesozoïc and Paleogene depositional basins. Introduction In Northen Tunisia the early Miocene inversion results into a thrust system mooving toward the SE
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The Gulf of Corinth – a Half Graben or an Asymmetric Rift?
Authors I. Moretti, D. Sakellariou, V. Lykousis and L. MicarelliP014 THE GULF OF CORINTH – A HALF GRABEN OR AN ASYMMETRIC RIFT ? 1 The Gulf of Corinth is often considered as a typical example of a more or less simple half graben with major border faults to the south and a flexure of the northern shore (Armijo et al. 1996). A lot of new data especially subsurface data and dates from both onshore and offshore has been compiled or acquired through the Corinth Rift Laboratory EEC project. We will discuss here the new structural schema imaged by this data. Geological setting Extension in the Aegean Sea started in
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The Sahel Platform Reconstruction Using Geological and Seismic Data, Tunisia
Authors H. Boussiga, R. Alouani, S. Tlig and M.H. InoubliP015 THE SAHEL PLATFORM RECONSTRUCTION USING GEOLOGICAL AND SEISMIC DATA (TUNISIA) Haïfa BOUSSIGA Rabah ALOUANI Said TLIG & Mohamed Hédi INOUBLI Unité de Recherche de Géophysique Appliquée Faculté des Sciences de Tunis – 2092 – Tunis – Tunisia e-mail : [email protected] Introduction Previous works have dealt with the geology of Paleogene series in the N-S axis zone and "Tunisian dorsale" (Rabhi 1999). These series include the El Haria BouDabbous/El Garia Souar/Chérahil and Fortuna formations which vary regionally in facies and thicknesses (Castany 1951; Burollet 1956) in response to tectonism during the Late Campanian-Maastichtian and Upper Eocene (Turki 1985; Bédir et
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Stratigraphic Effects and Tectonic Implications at Hinge-Zone Area between Sirte Basin and Cyrenaica Platform, NE Libya
By S. El ShariP016 STRATIGRAPHIC EFFECTS AND TECTONIC IMPLICATIONS AT HINGE- ZONE AREA BETWEEN SIRTE BASIN AND CYRENAICA PLATFORM NE LIBYA Summary: 1 The Agdabia Trough and Soluq Depression are the northeastern parts of the Sirte Basin on the passive continental margin of north Africa. They contain a thick succession of Upper Cretaceous and Tertiary sediments of varying lithology from marine shales to shelf carbonates. All the depositional sequences dip toward the southwest (basin direction) and faults are the most prominent structure in the area. Most faults are normal trending NW-SE with downthrow towards the basin. Interpretation of the structural features seen on
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Structural Styles and Hydrocarbon Habitat in Central Tunisia, West of the N-S Axis
Authors S. Kharbachi, N. Boukadi and A. GaayaP017 STRUCTURAL STYLES AND HYDROCARBON HABITAT IN CENTRAL TUNISIA WEST OF THE N-S AXIS 1 1. Introduction From the structural point of view Central Tunisia constitutes the so-called “Atlasic foothills” a transitional zone between the stable Saharan Platform to the South and the Thrust Belt to the North. This position favorable to the development of various structural traps has proved successful in several circumstances. Notable among these are the Douleb Semmama and Tamesmida fields which are producing oil since the late sixties. Furthermore lateral facies changes more or less controlled by structural features take place within Central Tunisia Platform which
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Location and Nature of the African Plate Boundary in Northern Tunisia
Authors K. Mickus, C. Jallouli and M. TurkiP018 LOCATION AND NATURE OF THE AFRICAN PLATE BOUNDARY IN NORTHERN TUNISIA 1 SUMMARY Gravity data are used to image the general crustal structure of northern Africa in particular Tunisia. Residual gravity anomalies constructed using regional seismic refraction models and analyzed using edge-enhancement techniques indicate that a previously unknown east-west trending anomaly with source depths between 3 and 7 km exists in northern Tunisia. Forward modeling of the residual anomalies indicate that the anomalies can be explained by either a crustal and mantle feature interpreted as low-density crustal material that is a remnant of the subducted African lithosphere or a
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Missour Basin – Meso-Cenozoic Tectonic and Sedimentary Evolution and Its Impact on Petroleum Systems
Authors M. El Alji and F. CharratP019 MISSOUR BASIN – MESO-CENOZOIC TECTONIC AND SEDIMENTARY EVOLUTION AND ITS IMPACT ON PETROLEUM SYSTEMS 1 M. EL ALJI* and F. CHARRAT The Missour Basin located in north-eastern Morocco is a part of the Inter-Atlasic domain. Because of its location between the High Atlas to the South and the Middle Atlas to the North the structural style of this zone was controlled by successive tectonic phases which started as early as the Triassic period and ended in the Tertiary time. During the Triassic & Liassic times the Atlas trough was initiated as a result of strikeslip movements along pre-existing hercynian
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Structural Evolution of the Gulf of Gabes-Eastern Offshore-Tunisia
Authors Z. Dey and H. Ben KilaniP020 STRUCTURAL EVOLUTION OF THE GULF OF GABES-EASTERN OFFSHORE-TUNISIA 1 ZIED DEY AND HATEM BEN KILANI ENTREPRISE TUNISIENNE D’ACTIVITES PETROLIERES Exploration Studies Department 27 Bis Av. K. Pacha 1002 Le Belvedere Tunis Tunisia. The studied area located in the Pelagian Platform covers the whole Tunisian part of the Gabes-Tripoli Basin. It is bordered to the south by the NE-SW Jeffara fault to the west by the N-S Axis and to the north by the "Mahdia-Isis" Paleohigh (Fig.1). The Triassic-Pleistocene lithostratigraphic column encountered in the Gulf of Gabes Basin consists of a variety of continental to open marine facies corresponding to
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Tunisian Atlas and European Wandering Terranes
Authors P.F. Burollet and F. MejriP021 TUNISIAN ATLAS AND EUROPEAN WANDERING TERRANES 11.Cap Bon - Hammamet 12. Bizerte area. 12 11 1 After Zapaterra 1994- Ben Ferjani et al.1990 P.F. BUROLLET AND F. MEJRI 1 st North Africa/Mediterranean Petroleum & Geoscience Conference & Exhibition Tunis 6 – 9 October 2003
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New Aspects on the Geological History of the Kufrah Basin, Libya
By U. HerzogP022 NEW ASPECTS ON THE GEOLOGICAL HISTORY OF THE KUFRAH BASIN LIBYA 1 The Kufrah Basin is one of the four large sedimentary Basins of Libya. It covers an area of about 250.000 km 2 with extensions into Egypt Sudan and Chad. With support from the Libyan National Oil Corporation OMV and partner-companies performed a series of studies in the period from 1998 to 2000. These studies included Landsat/ Radarsat interpretation stratigraphic and structural geological fieldwork and seismic interpretation. Incorporation of subsurface and surface data led to new aspects of the geological history of the basin: Infra-Cambrian grabens in the
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El Garia Formation in Libya Offshore, Facies and Reservoir Comparison between C137 and NC41 Wells
Authors P. Ronchi, B. Caline, P. Masse and S. CantaloubeP023 EL GUERIA FORMATION IN LIBYA OFFSHORE FACIES AND RESERVOIR COMPARISON BETWEEN C137 AND NC41 WELLS 1 P.RONCHI 1 B. CALINE 2 P.MASSE 2 AND S. CANTALOUBE 2 1 ENI Exploration and Production Division Via Emilia 1 20097 San Donato Milanese (MI) Italy 2 TotalFinaElf Geoscience Technologies avenue Larribau 64018 Pau Cedex France Introduction The main reservoir of the carbonate series in offshore Libya is represented by the nummulite facies of the El Gueria Formation of Eocene age (late Ypresian to early Lutetian). Thanks to the exchange of geological data between TFE and ENI regarding some of Bouri field wells
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Reservoir and Seismic Characterization of the Lower Devonian in South West Hassi R'Mel Area
Authors B. Mansouri and M.S. TighiltP024 RESERVOIR AND SEISMIC CHARACTERIZATION OF THE LOWER DEVONIAN IN SOUTH-WEST HASSI R’MEL AREA 1 B.MANSOURI SENIOR GEOLOGIST and M.S. TIGHILT GEOPHYSICIST Sonatrach / Exploration Division ALGERIA Until now in Algeria structural traps was the main target in petroleum exploration and the amount of hydrocarbon discovries is very little comparing to the generated hydrocarbon in the sahara platform. Du to this big amount of hydrocarbon can be discovered in the stratigraphic traps. The area is located in the Northwestern part of the Algerian sahara plateform at the South-west of the Giant HASSI R’MEL gas field ; it is bounded at
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Morphology of Dispersed Clay in the Nubia Sandstone Reservoir Rocks and Its Effect on the Reservoir Quality, October Oil Field, Gulf of Suez, Egypt
By G.R. GaafarP025 MORPHOLOGY OF DISPERSED CLAY IN THE NUBIA SANDSTONE RESERVOIR ROCKS AND ITS EFFECT ON THE RESERVOIR QUALITY OCTOBER OIL FIELD GULF OF SUEZ EGYPT 1 Several categories of dispersed clay are described for hydrocarbon bearing sandstone using Scanning Electron Microscopy. These are correlated to rock geological and petrophysical parameters commonly used in reservoir evaluation. Dispersed clays can occur in pores as (1) discrete (not intergrown) particles (2) crystals bridging across pores (3) intergrown crystal linings on pore walls like (4) clay rims (5) clay coats and (6) pore filling. These different clay morphologies significantly affect sandstone porosity permeability capillary
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The Application of Structural Modelling in the Simulation of Naturally Fractured Reservoirs
More LessP026 THE APPLICATION OF STRUCTURAL MODELLING IN THE SIMULATION OF NATURALLY FRACTURED RESERVOIRS 1 DELPHINE ROQUES STUART BLAND AND DAN HODGE Midland Valley Exploration Ltd. 14 Park Circus Glasgow G3 6AX United Kingdom Naturally fractured reservoirs account for an ever-increasing proportion of operator portfolios. The derivation and understanding of fracture attribute data is complex with fractured reservoirs having many additional barriers to correct examination. Examples of such difficulties are summarised by Nelson (2001) and include: a lack of in-depth quantitative approaches to describing and characterising fractured reservoirs and overly simplistic approaches to depicting fracture network geometry. Clearly the fluid flow
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Fractured Reservoirs Methods Application in the Ahnet Basin, Algeria
Authors M. Badsi, T. Tenkhi and M.C. CacasP027 FRACTURED RESERVOIRS METHODS – APPLICATION IN THE AHNET BASIN ALGERIA 1 M. BADSI T. TENKHI and M.C CACAS Centre de Recherche et Developpement Sonatrach Avenue du 1er Novembre 35000 Boumerdes Algiers Algeria The natural fracturing of rocks can play an important role in the improvement of permeability and may contribute to improve productivity in fields where the primary physical characteristics are poor. In the Algerian sedimentary basins principally the south-western basins determining the fractures network has always been the concern of geologists and the role of fracturing has been highlighted in several prospects. In the Ahnet basin the production
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Structural Development and Petroleum Prospectively of the Western Part of the Sirt Basin, Libya Using Remote Sening and Potential Field Data
Authors K.M. Abdunaser and G. ReehP028 STRUCTURAL DEVELOPMENT AND PETROLEUM PROSPECTIVELY OF THE WESTERN PART OF THE SIRT BASIN LIBYA USING REMOTE SENSING AND POTENTIAL FIELD DATA Abstract 1 KHALIFA M. ABDUNASER AND GIUMA REEH Petroleum Research Centre Tripoli-Libya P O Box: 6431 Satellite image analysis radar data interpretation geophysical data and geological data have been used to define the geological structure and Petroleum prospectively of the northwestern portion of the Sirt Basin Libya. Visual and digital satellite image analysis have enabled the rapid mapping of the regional tectonic structures and features while when merged with radar and geophysical data revealed additional and more detailed
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Bacterial Corrosion – Comparison between the Chemical and Biological Shielding of the Installations of Sonatrach
By M.A. GanaP029 BACTERIAL CORROSION – COMPARISON BETWEEN THE CHEMICAL AND BIOLOGICAL SHIELDING OF THE INSTALLATIONS OF SONATRACH 1 The bacterial proliferations are harmful. These latter appear by a total or partial obstruction of the drains by filling and perforating unexpected installations and exploitation equipments of surface or basic. The corrosive bacteria (sulphate reducing bacteria iron bacteria thiosuphate-reducing bacteria...) are mainly responsible for these harmful effects in the water injection and cooling systems. Their symbiosis and interaction with the algae the moulds and mushrooms accelerate the process of degradation and create a favorable environment for their growth. In order to face the
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Miskar Field – Field Value Gain through Change of Stimulation Approach
By L. TrabelsiP030 MISKAR FIELD – FIELD VALUE GAIN THROUGH CHANGE OF STIMULATION APPROACH 1 The Miskar field has historically had production problems related to the production of proppant from previous frac programmes on a number of gas condensate wells. Over a number of years of production a noticeable volume of lost production of gas has arisen because of the problems caused by the need to slowly bean up wells from start up. A real incentive therefore arose to develop a way to enhance production on any new wells at the same time avoiding the length process involved when re-opening wells or
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First SMART Wells in Rosetta Fields
Authors I. Sylvester, P. Thompson, T. Abdel Rahim Ali, M. Toubar and H. KatamishP031 FIRST SMART WELLS IN ROSETTA FIELDS 1 I. SYLVESTER P. THOMPSON T. ABDEL RAHIM ALI M. TOUBAR and H. KATAMISH British Gas Tunisia Ltd PO Box 153 2045 Tunis Tunisia Rashid Petroleum joint operating company (EGPC-50% BG-20% Shell 20% and Edison International -10%) will utilise two-zone SMART choking valves to control commingled gas flows from two separate reservoirs to increase deliverability and to optimise field reservoir management. The first well will be drilled in the producing Rashid-1 field in 2004 and the remainder in the second phase of development. The paper will describe how Rashpetco has used sophisticated reservoir
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Multidimensional SVD Processing – An overview
Authors J.I. Mars, J.-l. Mari, F. Glangeaud, N. Le Bihan and V. VrabieP032 MULTIDIMENSIONAL SVD PROCESSING – AN OVERVIEW Abstract 1 Reservoir study need information conveying by reflected waves. Processing before summation as migration AVA processing inversion of the amplitude etc are very efficient but also very complex to obtain. The efficiency is based on the optimization of the reflected waves quality. Most of the processing assumes that primaries waves have been correctly eliminated by wavefield separation techniques. SVD is one of the most used techniques to achieve this goal. It is a good tool when it is applied on single shot dataset (2D dataset). In case of multidimensional dataset (3C 4C
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Seismic Processing Package (S.P.P) – Conception and Realisation
Authors A. Hadjilah and A. ToutaouiP033 SEISMIC PROCESSING PACKAGE (S.P.P*) ( CONCEPTION AND REALISATION ) 1 Summary: Seismic Processing Package (S.P.P) that we developed under Windows operating system is a body of programs and realisation under development environment cross-machine with DelphiV7 Borland © (Windows-Linux). It is composed of several interactive scientific applications such as : 1°) KStat Software : This application allows to resolve the problems of fields static by the method of Kupstat for the sand dune regions and also by the Intercept method and Elevation while basing itself on a geological model of the weathered layer deducts from seismic coring . 2°) Wavelet
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Recent Advances in 3D Land Processing – A Case History from the Pakistan Badin Area
Authors S. Pharez, A. Karagul, S. Ali and J. SindenP034 RECENT ADVANCES IN 3D LAND PROCESSING – A CASE HISTORY FROM THE PAKISTAN BADIN AREA A. KARAGŮL¹ S. ALI² J. SINDEN¹ and S.PHAREZ¹ Summary ¹CGG Processing & Reservoir Services Great West Road TW8 9GG Brentford Middlesex UK ²bp Pakistan Islamabad The Badin Concession is relatively mature with many small oil fields which collectively account for about 50% of Pakistan’s current oil production. In total about 220 wells have been drilled in the area. The 3D seismic was shot with the dual purpose of helping in the development of the fields and to determine the remaining exploration potential. In 2000-2002
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4DST a Strong Tool to Manage Gas Reservoir
By B.K. BelliliP035 4DST UN OUTIL ROBUSTE POUR LA GESTION DES RESERVOIR A GAZ 1. INTRODUCTION La technologie de la sismique 3D a évolue au point ou son application est devenue systématique liée au développement des réservoirs sans pour autant arriver à résoudre certains problèmes d’engineering en cours de production. 1 C’est dans ce contexte que la sismique 4D ou le monitoring sismique est venu apporter des solutions à ces différents problèmes d’ingénierie de réservoir en mergeant les données de la modélisation sismiques des réservoirs avec les résultats du changement de l’impédance acoustique des données sismiques obtenues du monitoring sismique du réservoirs.
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An Integrated Evaluation of Prospects in the Late Jurassic Onshore Abu Dhabi
Authors N.O. Al Zaabi, A.B. Al Jeelani, J.F. Dervieux, C. Strohmenger, W. Soroka, R. Rosell, A. El Agrab and S. AliP036 AN INTEGRATED EVALUATION OF PROSPECTS IN THE LATE JURASSIC ONSHORE ABU DHABI 1 NA’EMA O AL ZAABI ABU BAKER AL JEELANI JEAN FRANCOIS DERVIEUX CHRISTIAN STROHMENGER WILLIAM SOROKA RAFAEL ROSELL ABDELFATAH EL AGRAB SULEIMAN ALI SUMMARY Using an integrated approach it was possible to evaluate the hydrocarbon potential for the onshore Abu Dhabi area. The primary focus was on the late Jurassic interval. Available well control was used tie the late Jurassic layers to the appropriate seismic events. Wavelet estimated from the seismic was used to verify the polarity and phase of the seismic data. Geologic information was used
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Detection of Carbonate Buildups in Tarbur Limestone by Using Seismic Attributes, SW Iran
Authors I. Abdollahi Fard, M.H. Aliee and A. JavaherianP037 DETECTION OF CARBONATE BUILDUPS IN TARBUR LIMESTONE BY USING SEISMIC ATTRIBUTES SW IRAN Summary 1 The Tarbur limestone has good potential from hydrocarbon reservoir point of view in the southwest of Iran. It was interpreted as a target horizon for oil discovery in a 3D seismic project at National Iranian Oil Company (NIOC) Exploration. Applications of different 3D seismic attributes were useful to study and recognize features such as reefal buildup and fault. Introduction The reflections of seismic waves within sedimentary rock bodies produce an image of their external shape and internal configuration or texture. The analysis of these
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Interpretation of Seismic Borehole Data of Rourd Chegga Field Sahara Algerie
Authors A. Bouguern and H.A. BakerP038 INTERPRETATION OF SEICMIC BOREHOLE DATA OF ROURD CHEGGA FIELD SAHARA ALGERIE 1 1 BOUGUERN ABDERRAHMANE & 2 BAKER H.A 1 Laboratoiry physic of earth University of Boumerdes ALGERIA 2 Faculty of earth sciences Unniversity of USTHB Bab ezzouar ABSTRACT: Recently a seismic bore survey (Walk-away) has been realized in Algeria.The aim operation is to study a geological problem met in production field of Rhoud Chegga (RDC). Athough the RDC-6 well has reached the top of the structure and is situated 888 meters at the esat of the RDC-1 well which produces oil the results were infortunatly negative. The RDC-6
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Contribution of Seismic Attributes in the Direct Detection of Hydrocarbon, Case History of a Permit in the South Algerian Sahara
Authors M. Djeddi, J. Ferrahtia, M. Djeddi and M.A. AitoucheP039 CONTRIBUTION OF SEISMIC ATTRIBUTES IN THE DIRECT DETECTION OF HYDROCARBON CASE HISTORY OF A PERMIT IN THE SOUTH ALGERIAN SAHARA Abstract 1 DJEDDI Mabrouk * FERRAHTIA Jalel * DJEDDI Mounir ** AITOUCHE Moh Amokrane * * Laboratoire de Physique de la Terre Faculté des Hydrocarbures et de la Chimie Université de Boumerdés 35000 ALGERIE ** Laboratoire des systèmes et signaux SUPELEC Plateau du Moulon 91192 Gif sur Yvette France The zone of interest is located in an important oil and gas zone; its position near Berkine and Illizi basin makes it very important. Our study is based on the
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Lithology and Gas Detection by AVO Crossplot Polarization and Intercept Inversion
Authors A. Kassouri and H. DjafferP040 LITHOLOGY AND GAS DETECTION BY AVO CROSSPLOT POLARIZATION AND INTERCEPT INVERSION Abstract 1 In this paper we try to study the causes of amplitude anomalies observed on true amplitude stacked seismic data in two southern Algerian gas fields using AVO crossplot analysis and acoustic impedance contrast estimation from AVO intercept. We present two examples associated with gas sandstones: Carboniferous gas sandstones in Sbaa basin and Ordovician gas sandstones in Ahnet basin. The two factors that strongly determine the AVO behavior of sandstones reflections are the normal incidence reflection R(0) called the intercept and the relative change in amplitude with
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Seismic Inversion and Reservoir Characterization, NC73, Sirt Basin, Libya
Authors A. Shahlol and A. MananiP041 SEISMIC INVERSION AND RESERVOIR CHARACTERIZATION NC73 SIRT BASIN LIBYA 1 ABDU-ELHAMED A. SHAHLOL and ALI M. MANANI Exploration Division Arabian Gulf Oil Company Benghazi Libya P. O. Box 263 Summary Geophysical inversion involves mapping the physical structure and properties of the subsurface of the earth using measurements made on the surface of the earth. However this is a broad definition that actually involves all seismic analysis work and interpretation. Inversion technique attempt to recover a broad-band pseudo-acoustic impedance log from a bandlimited seismic trace. This paper presents the seismic inversion work conducted over a carbonate deposits in the central
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New Data on Oil Source-Rocks in Pliocene Sediments of the South Caspian Petroleum System
More LessP042 NEW DATA ON OIL SOURCE-ROCKS IN PLIOCENE SEDIMENTS OF THE SOUTH CASPIAN PETROLEUM SYSTEM 1 SUMMARY Traditionally the principal oil source–rocks in the South Caspian basin (SCB) are considered to be Paleogene-Miocene deposits (Maykop-Diatom). As a result of conducted studies of Lower Pliocene sediments (Productive Series-PS) it had been revealed the oil generation potential of some stratigraphic units of PS. Results of given research are very important for development of further strategy of exploration and resources estimation in the South Caspian region. Black Sea 0 G eorgia Turkey 150km Dzirul Massif Armenia Greater Caucasus Lesse Cau r casus Azerbaijan
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L. Albian & Cenomanian-Turonian Source Rocks – A Key to Assess the Geodynamic & the Petroleum System of J.Goraa Area-Salt Dome Zone Northern Tunisia
Authors G. Chaari, H. Belayouni and M. SoussiP043 L. ALBIAN & CENOMANIAN-TURONIAN SOURCE ROCKS – A KEY TO ASSESS THE GEODYNAMIC & THE PETROLEUM SYSTEM OF J.GORAA AREA-SALT DOME ZONE NORTHERN TUNISIA 1 G. CHAARI H. BELAYOUNI & M. SOUSSI I. INTRODUCTION The work achieved concerns a geochemical study of the two source rocks occuring in the Goraa area (Salt Dome Zone-Northern Tunisia) the Late Albian Mouelha member and the Cenomanian-Turonian Bahloul formation. A special emphasis was accorded to the thermal maturity variation along a north-west to south-east axis across the study area. The objectives are to assess the petroleum system in this area and predict migration
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Hydrocarbon Potentialities of October Oil-Field area, GOS, Egypt
Authors G.R. Gaafar and M.Y. Zein El DinP044 HYDROCARBON POTENTIALITIES OF OCTOBER OIL-FIELD AREA GOS EGYPT 1 M.Y. ZEIN EL DIN 1 and G.R. GAAFAR 2 1 Geol. Dept. Fact. Of Science. Al Azhar Univ. 2 Gulf of Suez Pet. Company (GUPCO) The geochemical analysis data of 350 samples from 5 wells in October oil-field area have been used in this study. These analyses include the Total Organic Carbon (TOC) determinations programmed pyrolysis kerogen examination and vitrinite reflectivity measurements. The potential source rock intervals in the drilled section were determined and investigated through thermal history models. These models were run at the analysis well locations (5 wells)
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Gravity Compilation of Libya and Its Interpretation
Authors A. Sahil, A. Suleiman, O. Hammuda, B. Mejrab and A. BizanP045 GRAVITY COMPILATION OF LIBYA AND ITS INTERPRETATION 1 A. SAHIL A. SULEIMAN O. HAMMUDA B. MEJRAB and A. BIZAN Petrolume Research Center Tripoli- Libya The process of preparing a gravity compilation of Libya was started in the mid nineties when the National Oil Corporation (NOC) appointed a committee to evaluate the combined gravity project of Libya. A stage of assembly and integration was carried out through Robertson Research International Limited in Llandudno in 1998 with the expectation that more data would be forthcoming particularly elevation data where it was lacking in the center of the country. A second stage
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Gulf of Gabes – Tentative prediction of gas quality
By E. ClarkeP046 GULF OF GABES – TENTATIVE PREDICTION OF GAS QUALITY 1 The occurrence of significant quantities of carbon dioxide nitrogen and hydrogen sulphide within the Gulf of Gabes has a major impact upon the economics of hydrocarbon exploration and development in the basin. Consequently being able to predict both the presence and concentration of these non-hydrocarbon gases is a key objective for BG Tunisia. However this task is complicated by the existence of multiple sources for both hydrocarbons and non-hydrocarbons. Therefore an investigation has to be performed in two parts firstly it is necessary to identify which sources contribute to
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Structural Evolution of the Cap Bon-Grombalia Area, Northeastern Tunisia – Effects on the Hydrocarbon Generation & Expulsion Histories
Authors F. Adouani, S. Aissaoui and M. SaidiP047 STRUCTURAL EVOLUTION OF THE CAP BON- GROMBALIA AREA (NORTHEASTERN TUNISIA) EFFECTS ON THE HYDROCARBON GENERATION & EXPULSION HISTORIES 1 F.ADOUANI S.AISSAOUI & M.SAIDI ETAP-27bis Av. Kheireddine Pacha –1002 Tunis-Tunisa INTRODUCTION After the discovery of Belli and El Manzah fields the Eocene fractured limestones reservoir became an important objective in northeastern Tunisia. The selection of new drilling targets in the complex Cap Bon-Grombalia area imposes to determine the geological evolution and hydrocarbon potential. The purpose of this paper is to provide the necessary data for the ranking of new prospects within this area. The following are quantified to meet the
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Microwave Measurement System for On-Flow Monitoring of Water/Hydrocarbon Mixtures
By A. BertoliniP048 MICROWAVE MEASUREMENT SYSTEM FOR ON-FLOW MONITORING OF WATER/HYDROCARBON MIXTURES Alessandro Bertolini* Marwan Technology s.r.l. Via F. Buonarroti 2 I-56127 Pisa Italy In this work we present a microwave–based technique for the on–flow measurement of the water concentration in hydrocarbon compounds. Preliminary results on lubricant oil showed that water content ranging from 100 to 2000 ppm can be detected with an instrumental noise limited accuracy of ±30 ppm. The device is based on a microwave X– band (8–14 GHz) spectrometer [1] that simultaneously estimates both dielectric dispersion and absorption by means of a differential technique already used in the past
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Portable Gravity Gradiometer Using a Monolithic Sapphire Differential Accelerometer
By A. BertoliniP049 PORTABLE GRAVITY GRADIOMETER USING A MONOLITHIC SAPPHIRE DIFFERENTIAL ACCELEROMETER Alessandro Bertolini* Marwan Technology s.r.l. Via F. Buonarroti 2 I-56127 Pisa Italy In this work we demonstrate the feasibility of a new class of low frequency accelerometers for geodynamics studies and space applications. We present the design features of a new low noise single–axis differential accelerometer suitable for airborne geophysical survey and gravity gradient measurements. A resolution of 1 Eotvos (1 E = 10 −9 s −2 ) is achievable in a compact lightweight (less than 2 Kg) room temperature operating instrument. The basic components of a single–axis gravity gradiometer
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A Metrological Technique of Aeromagnetic Data Seabed Reduction – The Tyrrhenian Area Test
By O. FaggioniP050 A METROLOGICAL TECHNIQUE OF AEROMAGNETIC DATA SEABED REDUCTION – THE TYRRHENIAN AREA TEST Summary 1 We show the results obtained reducing the aeromagnetic anomaly field of the Tyrrhenian area (Italy) to the seabed surface and over part of the continental shelf topography. The bathymetry and the topography of the Tyrrhenian area show great variations related to a complex structural setting often associated to the presence of many tectonic lineaments seamounts or volcanic islands. The reduction of the geomagnetic field to the topographic surface is performed using a metrological technique (BTM) based on the downward continuation of the spectral high
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Modelling Turbidite Reservoirs Using Object Models
Authors A.R. Syversveen, R. Hauge and A. MacDonaldP051 MODELLING TURBIDITE RESERVOIRS USING OBJECT MODELS Abstract A complex object model suitable for modeling turbidite reservoirs is presented. The model is demonstrated on an example from the Gulf of Mexico. Introduction 1 Turbidites are deposits from tubidity currents which are down-slope movements of dense sediment-laden water. The local geometry and orientation of the turbidites are therefore strongly controlled by local topographic variations. The local characteristics of the turbidite bodies make the facies modelling difficult. We use an object model for the facies model as described in Lia et al. (1996) but with new and very complex object geometry. The
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Geostatistical Inversion and Lithology Simulation Case Study – MLSE Fields, Onshore Algeria
Authors R. Morton, J. Wanstall, S. Cherry and A. HopkinsP052 GEOSTATISTICAL INVERSION AND LITHOLOGY SIMULATION CASE STUDY – MLSE FIELDS ONSHORE ALGERIA 1 RICHARD MORTON 1 JAMES WANSTALL 1 STEVE CHERRY 2 and ANDY HOPKINS 3 1 Jason Geosystems Woking UK 2 Burlington Resources London UK 3 RDS-Helix Abstract Geostatistical inversion is a technique that allows full integration of petrophysical geological and geophysical data. In this example lithology and porosity simulation coupled with acoustic impedance inversion is performed on a regional 3D land seismic dataset. Enhanced reservoir characterization is developed for two sand bodies one of which is beyond the resolution of traditional seismic methods. Interpretation of the results
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Paleohydraulic Analysis of the Lower Part of Hasawnah Formation, Libya
More LessP053 PALEOHYDRAULIC ANALYSIS OF THE LOWER PART OF HASAWNAH FORMATION LIBYA ABSTRACT 1 Palaeohydraulic analysis has proved useful in reconstructing a variety of flow parameters in meandering and braided river systems mainly with a view to comparing the flow variables with modern rivers of broadly similar scale. However these flow parameters have been estimated for individual bars or a relatively small number of representative bars for a specific reach of the river system and no attempt has been made to continuously monitor flow variables through time in a thick cyclically deposited braided river system. These variables not only provide clues
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Depositional Environment of Lidam and Nubian Sanstone
By M. AbugaresP054 DEPOSITIONAL ENVIRONMENT OF LIDAM AND NUBIAN SANSTONE Abstract 1 The sedimentary sequence infilling Sirt basin was initiated by Nubian Sandstone which is separated from underlying granitic by the Hercynian unconformity and the upper boundary of the sequence by another unconformity followed by an early Late Cretaceous transgressive lithofacies of Lidam Formation. The Nubian sandstone sequence penetrated in the studied well 3V1-59W are 449 ft thickness from depth10546 ft to 10995 ft) of which 106 feet gap and the upper part in is Lidam formation (Cenomnain age) which considered the reservoir for hydrocarbon in concession 59 East 3V-59 block. The
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Part of Eustatism and Tectonics in the Aptian – Albian Unconformity, Northern-Central Part of Tunisia
More LessP055 PART OF EUSTATISM AND TECTONICS IN THE APTIAN – ALBIAN UNCONFORMITY NORTHERN – CENTRAL PART OF TUNISIA Abstract 1 SAADI JALILA DAHA FAOUZI EHSEN ZGHAL and JALLOULI CHOKRI INRSR BP 95 Hammam lif 2050 Tunis ONM Charguia Tunis Faculté des Sciences Rte de Soukra Sfax Faculté des Sciences Campus Universitaire El Manar Tunis The objective of this paper is to demonstrate the surimposition of “salt tectonics” to eustatism in the definition of Aptian-Albian unconformity. We analyse the sedimentary successions in tectonic and diapiric domains (NW of Tunisia) and at the NE of Tunisia. Geodynamic and paleogeographic reconstitutions have been
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Revised Age Dating of Some Cretaceous and Tertiary Formations in Al Jabal Al Ahkdar Area, NE Libya
Authors A.A. El Mehaghag and K.A. AshahomiP056 REVISED AGE DATING OF SOME CRETACEOUS AND TERTIARY FORMATIONS IN AL JABAL AL AKHDAR AREA NE LIBYA 1 The Al Jabal Al Akhdar is a mountain range in the northeast Libya (Figure 1). Late Cretaceous and Tertiary carbonate rocks are exposed in this area. The stratigraphy biostratigraphy and tectonic evolution of the region have been the subjects of many geological investigations since the beginning of the last century. The most important studies (relevant to this paper) are those conducted by Barr and Hammuda (1971) Barr and Berggren (1980) Crema (1922) Desio (1935) Kleinsmeide and Van den Berg (1968) and
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Seismic Sequence Stratigraphy and Structuring of Upper Cretaceous Reservoir Deposits in Central Tunisia
Authors T. Zouaghi, M. Bedir, H. Abdallah and M.H. InoubliP057 SEISMIC SEQUENCE STRATIGRAPHY AND STRUCTURING OF UPPER CRETACEOUS RESERVOIR DEPOSITS IN CENTRAL TUNISIA 1 T. ZOUAGHI 1 2 M. BEDIR 1 2 H. ABDALLAH 1 and M. H. INOUBLI 2 1 Institut National de Recherche Scientifique et Technique BP 95 Hammam-Lif 2050 Tunisia 2 Faculté des Sciences de Tunis Département de Géologie Campus Universitaire 1060 Tunis Tunisia ABSTRACT The integrated geologic and geophysic database defines the sedimentary record in terms of depositional sequences. Unconformities correspond to eustatic sea level changes regional tectonic events and sediment supply. A seismic stratigraphic schema was developed within each basin by comparison to reflection
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Magnetic Properties of Oil Sand at El Borma; Paleomagnetic Dating of Oil Emplacement
More LessP058 MAGNETIC PROPERTIES OF OIL SAND AT EL BORMA; PALEOMAGNETIC DATING OF OIL EMPLACEMENT Palaeomagnetism may help in improving the stratigraphic resolution of a sedimentary sequence if a number of requirements are fullfilled: 1 1) The magnetisation must be localised in minerals whose origin can be determined. If the magnetisation is carried by detrital minerals the time of deposotion may be determined or if carried by secondary diagenetic minerals the diagenetic event may be dated. The problem in most palaeomagnetic studies is the correct determination of the minerals that are carrying the remanent magnetisation. They may be very difficult to
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Palynostratigraphy of the Lower Devonian and the Lower Carboniferous Reservoirs in the Timimoun basin (West Algerian Sahara)
By N. AlemP059 PALYNOSTRATIGRAPHY OF THE LOWER DEVONIAN AND THE LOWER CARBONIFEROUS RESERVOIRS IN THE TIMIMOUN BASIN (WEST ALGERIAN SAHARA) Diverse assemblage of organic microfossils have been recovered from Teg and Reg fields in the Timimoun basin. They consist mainly on terresterial spores marine planktonic chitinozoans and acritarchs. 1 The assemblage are stratigraphically important but not well-preserved.Organic-walled Chitinosoans (represented by Urochitina simplex Fungochitina pistilliformis lata and Cingulochitina plusquelleci) were recovered from the Middle Member of the Dkhissa Formation and assigned to the upper Lochkovian stage which corresponds to the unit D30 of the lower Devonian (Upper Gedinnian). However the upper Member of
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North Africa Platform Structural Synthesis – Impact on the Understanding of Petroleum Systems
Authors A. Serrano, A. Chambers, E. Figari, J.I. Arregui and J.L. RuizS010 NORTH AFRICA PLATFORM STRUCTURAL SYNTHESIS – IMPACT ON THE UNDERSTANDING OF PETROLEUM SYSTEMS Abstract 1 A. SERRANO A.CHAMBERS E. FIGARI J.I. ARREGUI AND J.L. RUIZ Repsol-YPF Exploarcion SA Paseo de la Castellana 280 28008 Madrid Spain This paper consists of a synthesis of numerous published works and in-house studies and attempts to provide a practical tool for the explorationist regarding the impact of structural analysis upon the understanding of the petroleum systems of the North African Platform. It does not aspire to present another regional structural evolutionary model of the North African Platform such as those prestigious published works
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Hameimat Trough (Sirt Basin-Libya) – Early Stage of Rifting – Depositional and Volcaniclastic Processes
Authors M. Fornaciari, H. Seddiq and A. DakshiS011 HAMEIMAT TROUGH (SIRT BASIN -LIBYA) – EARLY STAGE OF RIFTING – DEPOSITIONAL AND VOLCANICLASTIC PROCESSES Summary 1 The Hameimat Trough represents the southeastern arm of the Sirte Basin and it shows an example of rifting development including structural depositional and volcaniclastic processes. The main rifting phase is Upper Cretaceous in age and the leading structural features are two NW-SE border faults linked by a regional NE-SE transfer fault with a strike-slip component. The rift basin is characterized by the deposition of a thick section of evaporites that marks the limits of the subsiding trough. The depositional sequences define the
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Volcanic Intrusions in Southern Tunisia – Characterisation and Development Mechanism
Authors D. Kebaier, N. Larid Ouazaa and F. HamoudaS012 VOLCANIC INTRUSIONS IN SOUTHERN TUNISIA – CHARACTERISATION AND DEVELOPMENT MECHANISM Introduction 1 In Tunisia three magmatic domains can be identified during the Triassic cycle a northern domain represented by the outcropping rocks either in diapiric Triassic or in the Carbonate Triassic in Northern Tunisia a central domain encountered in subsurface close to the North South Axis ; and a southern domain known from wells drilled in Sabria and El Franig areas. The two first domains have often been discussed and documented in the literature. The aims of this paper are to provide a description of the magmatic facies in
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The Geology and Hydrocarbon Potential of Ghadamis and Murzuq Basins, West Libya
More LessS013 THE GEOLOGY AND HYDROCARBON POTENTIAL OF GHADAMIS AND MURZUQ BASINS WEST LIBYA Abstract 1 F. Belhaj¹ R. Khalil² A. Sherif³ 1. TPOC Exploration Dept. Burj Al Fatah 9 th Floor-Tripoli Libya. [email protected]. 2. Petro-Canada. 3. Al-Fatah University The Palaeozoic and Mesezoic potential strata present in both Murzuq and Ghadamis basins is mainly represented by clastic sequences reaching a preserved thickness of more than 20 000ft in north-western Ghadamis Basin. The Palaeozoic strata in the two basins is directly related to the Palaeozoic sequences prevalent in the North African basins (Figure 1 & 2). The detailed interpretation of the Palaeozoic
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Location of the North Saharan Flexure in Southern Tunisia from Gravity Data
Authors H. Gabtni, C. Jallouli, H. Zouari, M.M. Turki and K.L. MickusS014 LOCATION OF THE NORTH SAHARAN FLEXURE IN SOUTHERN TUNISIA FROM GRAVITY DATA 1 H. GABTNI 1&2 C. JALLOULI 1 H. ZOUARI 2 M.M. TURKI 1 K.L. MICKUS 3 1 Département de Géologie Faculté des Sciences de Tunis Campus Universitaire 1060 Tunis Tunisia. 2 Laboratoire de Géoressources Institut National de Recherche Scientifique et Technique Borj-Cedria B.P. 95 2050 Hammam-Lif Tunisia. 3 Department of Geosciences Southwest Missouri State University Springfield MI 65804 USA. SUMMARY Gravity data were analysed to locate the boundary between a stable Saharan domain which is characterized by a shallow depth to basement and the Tunisian Atlas characterized
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The Structural & Tectonic Evolution of the Berkine-Ghadames Basin
Authors F.J. Gauthier, R.J. Hedley and S. McKennaS015 THE STRUCTURAL & TECTONIC EVOLUTION OF THE BERKINE-GHADAMES BASIN Anadarko has been successfully exploring in the Berkine Basin of Algeria for more than a decade and has access to an extensive seismic and well database including 4000 km 2 of contiguous 3d seismic coverage 12 000 Km of 2d seismic and over four hundred wells. The seismic data volumes and associated coherency time slices have been interpreted and integrated with the well data to better understand the structural history and stratigraphic development of the basin. Illizi Basin 1 Berkine-Ghadames Basin Basin Figure 1: Location Map showing major Tectonic Elements
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An Active Overthrust Belt and Associated Foredeep in the Chott Region of Central Tunisia – Some Implications for Hydrocarbon Exploration
Authors D.W. Klepacki and J.A. BatchelorS016 AN ACTIVE OVERTHRUST BELT AND ASSOCIATED FOREDEEP IN THE CHOTT REGION OF CENTRAL TUNISIA. SOME IMPLICATIONS FOR HYDROCARBON EXPLORATION Introduction 1 We view the topographical depression occupied by Chott El Gharsa Chott Jerid and Chott El Fajaj as an actively subsiding foredeep loaded by southward-verging overthrusts along the southern Atlas mountains in central Tunisian. Recognition of the foredeep geometry in the Chott region has implications for source maturation and play viability involving both Silurian and Jurassic source rocks. Modern earthquake seismicity uplifted alluvial fans and active deposition in the adjacent Chotts indicate the southern Atlas Mountains are actively uplifting.
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Late Cretaceous-Lower Eocene Structural and Subsidence Evolution in the Sahel Margin, Tunisia
Authors S. Khomsi, M. Bédir, H. Zouari and M.G. Ben JemiaS017 LATE CRETACEOUS-LOWER EOCENE STRUCTURAL AND SUBSIDENCE EVOLUTION IN THE SAHEL MARGIN. TUNISIA Abstract 1 Integrating different sources data for late Cretaceous-Palaeogene in oriental Tunisia permit quantify total subsidence subsidence rates and tectonic subsidence. The data sources are: outcrops well logs and regional seismic profiles. For the late cretaceous times we noted essentially eustatic accommodation. At the Palaeocene we noted tectonic and sedimentary subsidence in relation with local tectonic activity. At Lower Eocene times the subsidence seems to be of purely eustatic origin whereas at Middle to upper Eocene the tectonic subsidence increases. The mapping of thickness distribution compiled with
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New Techniques in Predicting and Risking Deepwater Nile Delta Prospects
Authors S.C. Bland, D. Roques and D.G. HodgeS018 NEW TECHNIQUES IN PREDICTING AND RISKING DEEPWATER NILE DELTA PROSPECTS 1 STUART BLAND DELPHINE ROQUES AND DAN HODGE Midland Valley Exploration Ltd. 14 Park Circus Glasgow G3 6AX United Kingdom Techniques are presented which enable the prediction of hydrocarbon prospects. Hydrocarbon migration studies enhanced by seismic attribute maps which define lateral changes in lithology allow the identified prospects to be risked in terms of charge and size. By assessing the changes and importantly the similarities in migration patterns at different stages of the prospect’s geological evolution increased understanding is gained on the key controls influencing prospect generation. Structural restoration
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Regional Structural and Stratigraphic Framework for the Eastern Mediterranean – Influence of Early Structure and Stratigraphy on the Development of the Levant Basin from Middle Jurassic to Recent
Authors M.A. Griffiths and M. FarrisS019 REGIONAL STRUCTURAL AND STRATIGRAPHIC FRAMEWORK FOR THE EASTERN MEDITERRANEAN – INFLUENCE OF EARLY STRUCTURE AND STRATIGRAPHY ON THE DEVELOPMENT OF THE LEVANT BASIN FROM MIDDLE JURASSIC TO RECENT Abstract 1 M. FARRIS and M.A. GRIFFITHS Shell U.K. Exploration and Production 1 Altens Farm Road Nigg Aberdeen AB12 3FY The Eastern Mediterranean is at present a frontier exploration province. There are currently no well penetrations in the deep water Levant Basin although recent seismic programmes have provided a framework upon which regional structural and stratigraphic interpretations can be built. Key events evident in Arabian Plate stratigraphy outcrop and well penetrations
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Improved Synthetic Well Ties in Deep Water Unconsolidated Turbidite Channels
Authors J. Faroppa, M. Noaman, E. Webb, R. Heath and T. KlimentosS020 IMPROVED SYNTHETIC WELL TIES IN DEEP WATER UNCONSOLIDATED TURBIDITE CHANNELS Abstract 1 JAMES FAROPPA 1 ; MAHMOUD NOAMAN 1 EDDIE WEBB 1 ROGER HEATH 1 THEODORE KLIMENTOS 2 *1 Rashpetco Joint Venture Company Building 18 Road 293 New Maadi Cairo Egypt *2 Sclumberger Logelco Inc. 25 Misr Helwan Rd Zeiny Tower Maadi Cairo Egypt Well to seismic ties are of critical importance in any study that attempts to match the wellbased depth data to the seismic time domain data. This is generally undertaken through a zero offset synthetic seismogram checkshot calibrated using the density and sonic logs and an
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Finding the Sweet Spots in a Large Under-Explored Block – Refocusing Exploration in the Northeast Mediterranean Deep Water Area
Authors E. Rowley, S. Hart, M. Gerrits, H. Meyer, M. Schwander, R. Demyttenaere, M. Nour El-Din, J. Stainforth and A. Abdel-AalS021 FINDING THE SWEET SPOTS IN A LARGE UNDER-EXPLORED BLOCK – REFOCUSING EXPLORATION IN THE NORTHEAST MEDITERRANEAN DEEP WATER AREA 1 To optimise Shell Egypt’s exploration strategy in the Nemed block a regional framework study has been completed involving calibration with the whole offshore Nile Delta. The current hydrocarbon discoveries in the area (c. 36 Tcf of gas) fall into a number of discrete trends. The aim of the study was to use a hydrocarbon system analysis to understand the controls on these trends. The remaining exploration ‘sweet spots’ have been predicted where the chances of optimal charge migration reservoir
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Flow Behavior Evaluation of the Static Reservoir Model in the Giant Ourhoud Field (Berkine Basin, Algeria)
Authors J. Salvadores, C. Carr, R. Reid, A. Martín, C. Yuste, J. del Moral, J. Malagón, A. Alaminos, T. Bartrina, J.L. Ruiz, C. Rossi and O. KälinS022 FLOW BEHAVIOR EVALUATION OF THE STATIC RESERVOIR MODEL IN THE GIANT OURHOUD FIELD (BERKINE BASIN ALGERIA) Ourhoud was one of the world’s largest on-shore oil discoveries in the nineties. The field is a structural trap bounded to the east by a major normal fault and elsewhere by three-way dip closure. The reservoir consists of TAGI amalgamated fluviatile sediments present in three major and distinct stratigraphic units (Lower Middle and Upper). They build-up into a complex and segregated reservoir system. 1 J. SALVADORES C. CARR R. REID A. MARTÍN C. YUSTE J. DEL MORAL J. MALAGÓN A. ALAMINOS T. BARTRINA
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Development of the Hassi Berkine South (HBNS) Giant Oil Field, Ghadames/Berkine Basin, Algeria
Authors P. Loader, J. Peffer, L. Bouazza, J. Thilliez, J. Rowney, W. Masino, M. Vickers, W. Brown, M. Pinel and H. MessaoudS023 DEVELOPMENT OF THE HASSI BERKINE SOUTH (HBNS) GIANT OIL FIELD GHADAMES / BERKINE BASIN ALGERIA 1 JOHN PEFFER LAKHDAR BOUAZZA JOEL THILLIEZ JOHN ROWNEY WILLIAM MASINO MICHAEL VICKERS WILLIAM BROWN and MARK PINEL Groupement Berkine Hassi Messaoud Algeria The HBNS field was discovered in January of 1995. Located within the Berkine Basin of Algeria the field lies approximately 200 km to the south east of the giant Hassi Messaoud field. The HBNS discovery well was located on 2D seismic data acquired in the early 1990’s thereafter followed by the acquisition of a 3D seismic survey in 1996. This dataset
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A Geological Overview of Four Giant Hydrocarbon Fields of Libya
Authors W. Ziza and F. BertelloS024 A GEOLOGICAL OVERVIEW OF FOUR GIANT HYDROCARBON FIELDS OF LIBYA Introduction 1 The exploration activity in Libya by the Italian ENI Company started in the late fifties. Nowadays the company is the major foreign oil and gas producer in the country: its production is from two giant fields Abu Attifel and Bouri and will be soon increased by that of two other giants - Al Wafa and Elephant – currently under development. This paper presents an overview of these four giant fields each of which is located in a different petroleum province of Libya. The exploration history the geology
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Giant Fields in the Sirt Basin, Libya
Authors M.I. Abuhajar and M. RoohiS025 GIANT FIELDS IN THE SIRT BASIN LIBYA Abstract The Sirt Basin with known recoverable reserves of 42-45 billion barrels of oil and 33 trillion cubic feet of gas ranks 15th among the world’s petroleum provinces. It covers an area of about 500 000 sq km in the north-central part of Libya and is characterized by regionally extensive NW-SE trending horsts and grabens (platforms and troughs). More than 25 large oil fields with an average of about 300 million barrels of recoverable oil; 16 giant fields with an average of 2000 million barrels recoverable oil; and at least one giant
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El Borma – Management of a Giant
Authors F. Ghaddab, M. Barbieri, M. Ali Fekih, B. Yahmadi, J. Zighni, N. Sabri and J. GuerboujS026 El BORMA – MANAGEMENT OF A GIANT SUMMARY 1 F. GHADDAB M. BARBIERI M. ALI FEKIH B. YAHMADI J. ZIGHNI N. SABRI and J. GUERBOUJ The evolution of technology has greatly affected the life of the oil fields and has helped in exploiting reserves which companies did not even foreseen at the time of development. Discovered in the early 60’s the El Borma field represents an example of longevity and capability of revamping itself by means of constant monitoring and innovation. The different phases of its life from natural depletion to water injection and extensive artificial lifting until horizontal
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Central Atlantic Tectonics in NW Africa – Implications for Hydrocarbon Potential
Authors I. Davison and M. TaylorS027 CENTRAL ATLANTIC TECTONICS IN NW AFRICA – IMPLICATIONS FOR HYDROCARBON POTENTIAL Central Atlantic Continental fit 1 We have produced a new continental fit of the Central Atlantic from Iberia to Guinea Bissau at the end of rifting (ca. 165 Ma) which relies on close matching of oceanic fracture zones and the ocean-continent boundaries between Mauritania and the US margin. Internal Mesozoic rifts strike-slip movements and extension of the Newfoundland Grand Banks area have been restored to improve the fit. Restoration of 650 km of right-lateral shear along the Gibraltar Fracture Zone produces an alignment of the Guadalquivir-Betic Salt Basin
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Regional Geology and Hydrocarbon Potential of Morocco – An Overview
By A.M. MorabetS028 REGIONAL GEOLOGY AND HYDROCARBON POTENTIAL OF MOROCCO – AN OVERVIEW 1 Hydrocarbons occur in Morocco throughout the sedimentary sequence from Paleozoic to Neogene and are represented by a variety of gas and liquid petroleums ranging from biogenic gas in the Rharb condensate in Essaouira light oil in Essaouira and Prerif to heavy oil in Tarfaya. In addition to a variety of seeps oil and gas shows have been encountered in most Moroccan sedimentary basins. Recent integrated studies based on substantial amounts of seismic geochemical and well data have permitted the development of many new exploration concepts in these basins.
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The Hydrocarbon Habitat of the Tarfaya-Lagwira Basin, Offshore Morocco
By M. NahimS029 THE HYDROCARBON HABITAT OF THE TARFAYA-LAGWIRA BASIN OFFSHORE MOROCCO 1 The Tarfaya-Lagwira segment located in southern Morocco is a part of the Eastern Atlantic passive margin.This zone covers a total area of about 200.000 sq Km comprising large shelf and deep-water zones. From Petroleum Exploration point of view this area is still under explored. The shelf was tested by only 4 wells while the deep water zone still untested up today. Exploration efforts conducted revealed that the area is characterised by the presence of a world-class source rock ( the Cenomano-Turonian Tarfaya shale ). Drilling activities during the seventies
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Petroleum Potential and Future Outlook of the Safi Offshore Area – A Segment of the Promising Atlantic Margin of Morocco
Authors A. Ait Salem, H. Jabour, S. Ait Brahim, A. El Ouataoui and M. IdrissiS030 PETROLEUM POTENTIAL AND FUTURE OUTLOOK OF THE SAFI OFFSHORE AREA – A SEGMENT OF THE PROMISING ATLANTIC MARGIN OF MOROCCO 1 A. AIT SALEM H. JABOUR S. AIT BRAHIM A. EL OUATAOUI and M. IDRISSI In the deep water areas of Safi Segment a thick Mesozoic to Cenozoic sedimentary section was deposited contemporaneously with intense salt tectonics leading to development of relatively large and highly subsiding basins between salt diapers on a graded slope. The near onshore Lower Cretaceous outcrops show several episodes of quartz rich influxes shed from Palaeozoic reliefs and transported into the basin through fluvial systems.
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El Hamra Permit, Southern Tunisia – Application of Surface Geology to Oil Exploration
Authors L. Macchi, E. Caamano, D. Klepacki and R. SandmanS031 EL HAMRA PERMIT SOUTHERN TUNISIA – APPLICATION OF SURFACE GEOLOGY TO OIL EXPLORATION 1 L. MACCHI 1 E. CAAMANO 2 D. KLEPACKI 3 and R. SANDMAN 1 1 Reservoir Associates International Laburnum House Shocklach Cheshire SY14 7BT U.K. 2 Pioneer Natural Resources USA Inc. The El Hamra exploration permit is located some 50km north of the El Borma Field in southern Tunisia and covers an area of 5122km 2 of which approximately 3350km 2 is buried by sand dunes of the eastern flank of the Erg Oriental. This paper presents the results of a reconnaissance geological survey conducted in
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The Hydrocarbon Potential of the Golf of Hammamet Basin, Tunisia
Authors N. Brahim, S. Brahim and F. ZargouniS032 THE HYDROCARBON POTENTIAL OF THE GOLF OF HAMMAMET BASIN (TUNISIE) Abstract 1 N. BRAHIM* S. BRAHIM F. ZARGOUNI AUTHOR ECOLE NATIONALE DES INGENIEURS DE SFAX BP:W 3038 SFAX TUNISIEAddress The golf of Hammamet area could be considered as an attractive hydrocarbon province which is still hiding most of its hydrocarbon reserves. In fact all favorable conditions to generate big amount of hydrocarbon are satisfactory (presence of good source rock units high geothermal gradient good reservoir quality and favorable trapping mechanism). The Mactaris-1 well which penetrated a vertical column of 850 meters of bitumen at Serdj reservoir represents a sound
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Silurian Acacus Play in Ghadames Basin, Southern Tunisia
Authors K. Rourou, A. Ouahchi, A. M‘Rabet and M.H. AchecheS033 SILURIAN ACACUS PLAY IN GHADAMES BASIN SOUTHERN TUNISIA 1 KAMEL ROUROU ABDERRAHMEN OUAHCHI ALI M’RABET AND MOHAMED HEDI ACHECHE ETAP 27 bis Avenue Kheireddine Pacha BP 367 1002 Tunis Tunisia INTRODUCTION The Acacus play began in 1996 when the Oued Zar#1 well reentered by AGIP flowed 2500 BOPD from the low resistivity Upper Silurian Acacus sandstones. The reservoir has generally low resistivity values of less than 3ohm with some as low as 0.7ohms. Conventional logs analysis techniques calculate very high water saturations and are common reasons for potential zone to be bypassed or unrecognised. Re-evaluation of the reservoir based
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Characteristics of Recent Oil and Gas Discoveries in the Deep Water Portion of the Western Nile Delta, Egypt
Authors D. Phelps, J. Bedingfield, R. Roberts, T. Maher and T. DoddS034 CHARACTERISTICS OF RECENT OIL AND GAS DISCOVERIES IN THE DEEP WATER PORTION OF THE WESTERN NILE DELTA EGYPT 1 DAVID PHELPS 1 JOHN BEDINGFIELD 1 RON ROBERTS 1 TOM MAHER 1 and TIM DODD 2 1 Apache Egypt P.O. Box 27582 Houston TX 77227 2 BP Egypt Cairo Egypt Over the past 35 years more than 4.0 BBOE have been discovered in the Nile Delta primarily as gas and condensate. With the discovery of multi-TCF gas fields in the western Nile Delta interest in the deepwater Pliocene play has increased significantly in the past few years. In 2002 Apache
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Exploration on the Eastern Border of the Reggane Basin, SW Algeria – Are the Old Assumptions Still Valid?
Authors A. Chambers, M. Baene, R. Ferrando, I. Polonio, M. Rodrigo and E. FigariS035 EXPLORATION ON THE EASTERN BORDER OF THE REGGANE BASIN SW ALGERIA – ARE THE OLD ASSUMPTIONS STILL VALID? 1 M BAENA A.CHAMBERS R. FERRANDO I. POLONIO M. RODRIGO and E. FIGARI Repsol-YPF Exploarcion SA Paseo de la Castellana 280 28008 Madrid Spain Exploration activity in the Reggane Basin began in the late 1950s. Early wells encountered oil and gas shows at Strunian-Tournaisian and Visean C levels but the first discovery was done in the Reggane structure (1964) which flowed gas from Lower Devonian reservoirs. Continued exploration on trend led to further discoveries (Tiouliline (1980) and Azrafil (2000)) that also
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Paleozoic Petroleum Systems in Ghadames Basin, Southern Tunisia
Authors M.H. Acheche, H. Troudi, M. Ferjaoui and D. KebaierS036 PALEOZOIC PETROLEUM SYSTEMS IN GHADAMES BASIN SOUTHERN TUNISIA 1 HABIB TROUDI MOUNIR FERJAOUI DORSAF KEBAIER and MOHAMED HEDI ACHECHEI ETAP 27 bis Avenue Kheireddine Pacha BP 367 1002 Tunis Tunisia INTRODUCTION The Ghadames Basin is an intracratonic depression extending from western Algeria to Eastern Libya and encompassing the southernmost of Tunisia. It is a major hydrocarbon province as evidenced by the numerous producing fields. Until the mid-nineties most of the reserves occurred at the Triassic level. The contribution of Paleozoic horizons was insignificant and it was limited to three small size finds made in the Ordovician and in the
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Tectonic and Sedimentary Factors Controlling the Petroleum System of the Murzuk Basin, Libya
Authors F. Bertello, A. Fattorini and C. VisentinS037 TECTONIC AND SEDIMENTARY FACTORS CONTROLLING THE PETROLEUM SYSTEM OF THE MURZUK BASIN LIBYA Introduction 1 The Murzuk Basin lies some 800 km south of Tripoli and covers an area of about 350 000 km 2 . More than ninety exploratory wells have been drilled so far leading to the discovery of 21 commercial oil fields among which are the giant fields A-NC115 (“Sharara” Repsol operated) and F-NC174 (“Elephant” ENI operated). The primary petroleum play consists of the Upper Ordovician reservoir sandstones (Memouniat Fm. and part of the underlying Haouaz Fm.) and of the Lower Silurian shales (Tanezzuft Fm.) the
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A New Insight to the Hydrocarbon Potential of the RKF Field (Berkine Basin, Algeria)
Authors J. Navarro, T. Bartrina, I. Ferroukhi, C. Rosi, J.L. Ruiz and J. MalagónS038 A NEW INSIGHT TO THE HYDROCARBON POTENTIAL OF THE RKF FIELD (BERKINE BASIN ALGERIA) by Jorge Navarro* Teresa Bartrina* Ictyssem Ferroukhi** Carlos Rossi*** Jose Luis Ruiz* Jesús Malagón*. * CEPSA E&P Madrid Spain ** PED SONATRACH Algiers Algeria ***Dpt. Petrología y Geoquímica Instituto de Geología Económica (CSIC-UCM) Universidad Complutense Madrid Spain In 1992 the Sonatrach/CEPSA Association discovered the Rhourde El Krouf (RKF) oil field located in the Berkine Basin of eastern Algeria in the Erg Oriental region (Figure 1). The RKF-1 exploration well drilled to a total depth of 5 081 m tested a combined rate of 5 000
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3D Seismic Acquisition Covering Jakhira Oasis, Libya
More LessS039 3D SEISMIC ACQUISITION COVERING JAKHIRA OASIS LIBYA 1 Concession C96 with a surface area of 185 sq. km is located in the south-east of the Sirte Basin 450 kilometres south-west of Benghazi in Libya. Wintershall-Libya has a 100% interest in the concession in which two oil fields are present: As Sarah and Jakhira. As Sarah was discovered in 1989 and is a giant with over 1 billion barrels of OOIP in the Sarir reservoir (depth 12 000 feet) which consists of medium to coarse grained well-sorted sandstone deposited in the medial part of a sand dominated braided river system
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A Novel Approach to Processing Vibroseis/TZ Seismic Data – Teamwork Finds Good Solutions
Authors M.S. Al Nahhas, A.B. Al Jeelani, P. Fouchard, M. Boekholt, F. Al Shekaili, E. Kleiss, M. West, C. Tsingas and O. LangtonS040 A NOVEL APPROACH TO PROCESSING VIBROSEIS/TZ SEISMIC DATA – TEAMWORK FINDS GOOD SOLUTIONS Abstract 1 A large vibroseis survey over sand dunes and coastal plain and an adjacent dynamite/airgun near-shore transition zone survey were jointly reprocessed. The surveys cover two low-relief major oil fields. Key to the processing was deterministic zero-phasing for the vibroseis data and partly-deterministic partly-adaptive zero-phasing for the impulsive data before picking first-breaks for refraction statics. This was complemented by a hybrid residual refraction statics approach and careful stacking velocity picking including non-hyperbolic move-out correction. The result is a more reliable seismic image of these oil
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Seismic Acquisition in Sensitive Environment, Archeology and Visual Impac – Example of the NC 191 Block, Murzuk Basin, Libya
By O. WattezS041 SEISMIC ACQUISITION IN SENSITIVE ENVIRONMENT ARCHAEOLOGY AND VISUAL IMPACT – EXAMPLE OF THE NC 191 BLOCK MURZUK BASIN LIBYA In December 2001 TotalFinaElf E&P Libye (TEP Libye) started a 3400 km 2D seismic acquisition campaign on block NC191 in a desert area of the Murzuk basin in the southwest of Libya. Results from EBS and EIA studies showed that the environment is very sensitive and has a rich Paleolithic and Neolithic archaeological patrimony. 1 OLIVIER WATTEZ 1 FRANCIS CLEMENT 1 and MARIE PIERRE DUVAL-VALENTIN 2 TEP Libye decided to put a permanent archeological team of European and Libyan experts
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The Importance of Anisotropy for Prestack Imaging of Extensional Fault Systems
Authors B. Ver West, P. Hilton and D. WilkinsonS042 THE IMPORTANCE OF ANISOTROPY FOR PRESTACK IMAGING OF EXTENSIONAL FAULT SYSTEMS Introduction 1 The presence of anisotropy in the subsurface is a generally accepted but commonly overlooked concept in processing. When it is addressed usually only the effect on moveout is considered. This paper shows the importance of including anisotropy in imaging not only because it properly handles the long offset moveout but also because it correctly handles the focusing and spatial positioning which is subtler but may be even more important. The paper shows an imaging problem from the coast of the Gulf of Mexico. It is a
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Prestack Depth Imaging Onshore Libya
Authors C. Hanitzsch, B. van der Es and W. HeerdeS043 PRESTACK DEPTH IMAGING ONSHORE LIBYA Summary 1 Improved imaging below a complex fault zone more continuity of reflections better focusing of faults and less noise are achieved by anisotropic prestack depth migration of a case study in the eastern Sirte basin of Libya. The area studied is generally of low structural relief usually not typical of prestack depth migration projects but has complex faulting resulting in strong lateral changes in velocity. These were degrading the seismic image from the original standard time processing. The prestack depth imaging work showed at an early stage that the geology is anisotropic and
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Large Scale Fracturing, from Identification to Reservoir Model Integration – a Case Study
Authors D. Foulon, S. Delisle and Y. LagalayeS044 LARGE SCALE FRACTURING FROM IDENTIFICATION TO RESERVOIR MODEL INTEGRATION - A CASE STUDY Summary This paper describes a field case on a deep fractured onshore gas field where the challenges of characterising large size fracturing objects of primary dynamic impact despite a poor-quality seismic coverage have been overcome leading to a complete redefinition of the reservoir model. 1 Sources of information were extensively analysed : outcrops studies aerial photography and satellite imagery well imagery cores. These complementary but dispersed analyses were then put in coherence through the use of innovative tools developed in-house. The resulting synthesis enabled a proper
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Petrophysical Analysis in Reservoir Characterisation – Application in Triasic of Hamra Field – Gas Field Algeria
By R. BaoucheS045 PETROPHYSICAL ANALYSIS IN RESERVOIR CHARACTERISATION – APPLICATION IN TRIASIC OF HAMRA FIELD – GAS FIELD ALGERIA 1 R. BAOUCHE* * University Ahmed Bouguerra Faculty of Hydrocarbons and Chemistry. Avenue del’indépendance.35000 Boumerdès Algéria ABSTRACT This study shows the role of Wireline pterophysical analysis as a Tool in reservoir characterisation of the shaly sands in Sahara. This paper examines the use of log analysis and mean petrophysical reservoir parameters as Tool to determine is successfully establishing reservoir architecture and fluid-flow trends. Using the data log of Gamma_Ray Neutron density sonic and resistivity for petrophysical analysis to correlate some layers in the
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Validation of Theoretical Coning Models Using Numerical Single-Well Simulation
Authors S.M. Alakhdar, A.A. Urayet and M.A. BenrwinS046 VALIDATION OF THEORETICAL CONING MODELS USING NUMERICAL SINGLE-WELL SIMULATION Abstract 1 SALEM M. ALAKHDAR* ABDELHAMEED A. URAYET** and MABRUK A. BENRWIN** Water coning is often a serious operational problem in oil formations producing with strong bottom water drive. In Libya many of the oil reservoirs have water coning problem. The production theory in such fields would normally consider limitation of the production rate to a certain minimum (critical rate) to prevent water cone from happening. However since such a rate is normally very small (i.e. not economical) the company will be producing at a higher rate and it becomes
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Sedimentology and Petrophysics in the Reservoir Characterization of the Ourhoud Field, Algeria
Authors N. Lee, A. Oudjida, C. Howells and K. CorriganS047 SEDIMENTOLOGY AND PETROPHYSICS IN THE RESERVOIR CHARACTERIZATION OF THE OURHOUD FIELD ALGERIA 1 NICK LEE AZIZ OUDJIDA CHRIS HOWELLS and KEVIN CORRIGAN Anadarko Algeria Company LLC The Ourhoud Field is one of the largest oil discoveries of recent times in the Algerian Berkine Basin containing more than 2 billion barrels of oil in place. The reservoir interval is within sandstones of the Triassic Argileux Greseux Inferieur Formation (TAGI). These are characterised by a complex sequence of fluvial lacustrine lacustrine-deltaic aeolian and palaeosol facies associations. The complexity of this continental depositional system as a reservoir is further enhanced by the
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Chemostratigraphy and Correlation of a Chalk Petroleum Reservoir – Case of the Campanian-basal Maastrichtian Abiod Formation in Tunisia
Authors A. Mabrouk, I. Jarvis, R.T.J. Moody, H. Belayouni, A. Ben Brahim and S. De CabreraS048 CHEMOSTRATIGRAPHY AND CORRELATION OF A CHALK PETROLEUM RESERVOIR – CASE OF THE CAMPANIAN-BASAL MAASTRICHTIAN ABIOD FORMATION IN TUNISIA 1 A. MABROUK 1 2 I. JARVIS 2 R.T.J. MOODY 1 H. BELAYOUNI 2 A. BEN BRAHIM and S. DE CABRERA 3 1 School of Earth Sciences and Geography Centre for Earth and Environmental Science Research Kingston University Penrhyn Road Kingston upon Thames Surrey KT1 2EE UK 2 Département de Géologie Faculté des Sciences de Tunis Campus Universitaire 1060 Tunis Tunisie 3 PDVSA Exploracion y Produccion Introduction In Tunisia Campanian-Maastrichtian chalky limestones constitute reservoir rocks in several oil fields (Sidi el
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The Application of Borehole Imaging in Appraising a Triassic (TAGI) Fluvial Reservoir, the Ourhoud Field, Berkine Basin Algeria – Constraining the Reservoir Model Build
More LessS049 THE APPLICATION OF BOREHOLE IMAGING IN APPRAISING A TRIASSIC (TAGI) FLUVIAL RESERVOIR THE OURHOUD FIELD BERKINE BASIN ALGERIA – CONSTRAINING THE RESERVOIR MODEL BUILD Abstract 1 The Ourhoud Field is located in the Berkine intracratonic basin of Algeria (Fig. 1). The field discovered in 1994 straddles Blocks 404 405 and 406a and is expected to contain recoverable reserves in excess of 1 billion barrels making it the second largest oil field in Algeria. The Triassic Argilo-Grèseux inférieur (TAGI) reservoir is subdivided into three lithostratigraphic intervals (Fig. 2): • Lower TAGI • Middle TAGI • Upper TAGI T. GLOVER 1
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Continuous Coring of a Slim-Hole, a Cost Effective Exploration Alternative?
By E. CaamanoS050 CONTINUOUS CORING OF A SLIM-HOLE A COST EFFECTIVE EXPLORATION ALTERNATIVE? Introduction 1 The statement “In the final analysis oil is first found in the mind” (Wallace Pratt 1952) recognizes that discovery is rooted in the imagination of the geoscientist. This is true only because our understanding of the truth is so limited that for any given set of facts only our imagination can restrict our ability to generate innovative geological concepts that honor the data and may still lead to the discovery of a new hydrocarbon accumulation. Pratt’s memorable quote captures the essence of Thomas C. Chamberlain’s thesis presented
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