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2nd EAGE North African/Mediterranean Petroleum & Geosciences Conference & Exhibition
- Conference date: 10 Apr 2005 - 13 Apr 2005
- Location: Algiers, Algeria
- ISBN: 978-90-73781-38-2
- Published: 10 April 2005
21 - 40 of 100 results
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Detecting Reservoir Compartmentalization by Strontium Isotope Analysis, BKNE Field, Berkine Basin, Algeria
Authors A.L. Cole, D. Wheller, B. Ikhlef, H. Berkani and J. McBridgeA22 Detecting Reservoir Compartmentalization by Strontium Isotope Analysis BKNE Field Berkine Basin Algeria Abstract Summary TONY L. COLE (1) D. WHELLER (1) B. IKHLEF (1) H. BERKANI (1) JOHN MCBRIDE (2) 1 BKNE field produces from stratigraphically and structurally complex sandstones of the Trias Argilo-Greseux Inferieur (TAGI) in Block 404 in the Berkine Basin Algeria (Figure 1). The TAGI is subdivided into Upper Middle and Lower fluvial sandstone units (Figure 2). In BKNE field the TAGI U and M sands are productive. As of August 2004 20 wells have been drilled in the field. The field is divided into 3
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Improving Reservoir Description with Innovative Application of Tracer Technology
Authors H. Cubillos, O. Gonzalez, A. Alaminos and H. TorgersenA23 IMPROVING RESERVOIR DESCRIPTION WITH INNOVATIVE APPLICATION OF TRACER TECHNOLOGY 1 H. CUBILLOS 1 O. GONZALEZ 1 ALAMINOS 1 H. TORGERSEN 2 1 CEPSA E&P Ribera del Loira 50 28042 Madrid Spain 2 Institute for Energy Technology N-2027 Kjeller Norway Introduction This paper describes the use of tracer technology for improving reservoir description and optimizing oil production. It treats the use of water and gas tracers and the experience of tracer application in RKF field Berkine Basin Algeria. RKF Field has produced from TAGI formation over 50 MMbls of volatile oil under peripheral down dip miscible gas injection. Breakthrough of
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Modelling of Miscible WAG Injection in the Hassi Berkine Fields
Authors A. Fekkane, D. Kilgore, J. Thilliez and A. HadjazA24 MODELLING OF MISCIBLE WAG INJECTION IN THE HASSI BERKINE FIELDS Keywords: Full Field Model WAG Miscible Process Reservoir Development Oil Field. Abstract The Hassi Berkine Fields are located in Block 404 of the Berkine Basin Algeria (Figure 1). This Block contains seven fields four of which – HBNS HBN HBNSE and BKNE – have active miscible gas injection projects. HBNS and HBN are the main fields and both are candidates for miscible WAG injection. 1 A. FEKKANE D. KILGORE J. THILLIEZ and A. HADJAZ Groupement Berkine Reservoir Department. Route de CINA Zone des Partenaires SH 24 Fevrier BP 394
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Defining the Complete Stress Tensor from Log Data – Examples from the Hassi Messaoud Field, Algeria
Authors J. Paludan, L. Oudjida and S. Mekmouche1 A25 Defining the complete stress tensor from log data – examples from the Hassi Messaoud Field Algeria J. PALUDAN L. OUDJIDA & S. MEKMOUCHE Summary The paper presents a new method developed to accurately characterize the variation of in situ stresses with depth based on conventional logs and borehole image data. By combining existing theory of poro-elasticity with well-established techniques for inversion of borehole image observations it is demonstrated how the full stress tensor including magnitude and orientation of all three principal stresses may be derived directly from the log data. In the absence of available LOT or other
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How Our Approach to Fractured Reservoirs Has Matured Over Time?
By R.A. NelsonA26 HOW OUR APPROACH TO FRACTURED RESERVOIRS HAS MATURED OVER TIME? Abstract 1 Although some of the first reservoirs drilled and produced world-wide were fractured reservoirs they soon fell into disfavor in the oil and gas industry. The reasons were a mixture of availability of more conventional reservoir prospects and the lack of sound reservoir engineering techniques for these reservoirs. However many relatively early fractured reservoirs displayed the upside potential of these reservoirs. These included the giant Kirkuk Asmari carbonate reservoir in Iraq the carbonate and granite reservoirs of La Paz Field in Venezuela and several of the Devonian shale
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Approaching Fracture Density – Anisotropy Gradient=Fracture Density?
More LessA27 APPROACHING FRACTURE DENSITY - ANISOTROPIC GRADIENT = FRACTURE DENSITY? Summary For optimal hydrocarbon recovery from fractured reservoirs a critical issue is to gain an accurate understanding of the natural fracture system. Currently fracture characterization using amplitude based technologies is routinely performed relying on amplitude versus angle/offset (AVA/AVO) and azimuth (AVAZ) to exploit anisotropic gradient behavior which is today commonly used in the industry as fracture density and is also treated as the principal and proportional cause of anisotropy strength. In using anisotropic gradient as fracture density except for Rüger conditions we realized that two other implicit assumptions are made:
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Fracture Attributes from Seismic Anisotropy – The Tin Fouyé Tabankort Case Study
Authors Y. Freudenreich, E. Angerer, C. Reiser, J.-L. Piazza and J. PerrotA28 FRACTURE ATTRIBUTES FROM SEISMIC ANISOTROPY – THE TIN FOUYÉ TABANKORT CASE STUDY Abstract 1 Over the last few years there has been significant interest in the analysis of open fluid-filled fractures from P-wave azimuthal anisotropy. This paper presents the results of a recent study on the Tin Fouyé Tabankort Field in the Illizi Basin (Algeria). The goal of this study was to characterise the seismic anisotropic fractures from RMS amplitude maps on a small volume of the field. Using an integrated workflow that combines azimuthal-friendly processing with a proprietary geostatistical decomposition technique we have obtained robust quantitative estimation of
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3D Azimuthal Velocity Analyses On Fractured Medium
Authors J. Arnaud, J.-P. Dunand, P. Berthet and P. JulienA29 3D AZIMUTHAL VELOCITY ANALYSES ON FRACTURED MEDIUM Abstract This paper proposes a case study for quantifying the anisotropy that may occur in a fractured carbonate reservoir. Wide azimuthal seismic datasets often exhibit an azimuthal dependency on the normal moveout and the AVO gradient measurements (Rüger 1996 Lynn et al 1996 Lefeuvre 1994). In this paper we present an application of the methodology using azimuthal interval velocity variations. The calculations were based on an efficient anti-multiple processing on a robust automatic picking of azimuth/offset events and on an adequate depth tomography (P. Sexton 1998). The acquisition of the considered Ocean
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Fracture Characterisation in Hamra Quartzites-Hassi Messaoud Field
Authors N. Alem, M. Belachheb, S. Selmani and N. Chetouani2 nd North African /Mediterarranean Petroléum & Geosciences A30 FRACTURE CHARACTERISATION IN HAMRA QUARTZITES-HASSI MESSAOUD FIELD M.Belachheb* N.Alem* S.Selmani & Chetouani N Division Centre de Recherche et Developpement – Sonatrach Avenue du 1 er Novembre 35000 Boumerdes Algerie I- INTRODUCTION Hamra quartzites arouse an important petroleum interest since the discovery of hydrocarbons in the Ordovician formation. Despite their tightness and their low porosity hamra quartzites yielded a significant rate of hydrocarbon the case of HG well which has produced 14m 3 /h in 1995 . However The same levels in the HT HD and HD bis wells are being non
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Fracture Characterization in an Algerian Gas Reservoir Using Seismic Azimuthal Anisotropy
Authors L. Cherel and P.N.J. RasolofosaonA31 FRACTURE CHARACTERIZATION IN AN ALGERIAN GAS RESERVOIR USING SEISMIC AZIMUTHAL ANISOTROPY Summary 1 Seismic methods in a broad meaning (i.e. surface sismics and well seismics) are very useful for extending the description of the fracturation beyond the close vicinity of the wells and for obtaining a description of fractures at a large scale. In this study P-wave azimuthal velocity analyses of 3D prestack seismic data have been tested in a fractured gas field in Algeria. The technique provides the direction and the intensity of seismic anisotropy at the level of a low porosity reservoir. The anisotropy directions obtained at
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Quantitative Fracture Evaluation from Ultrasonic Imaging, Hassi Messaud Field, Algeria
Authors P. Montaggioni, P. Jeffreys, M. Kourta, H. Attoui and S. MekmoucheA32 Quantitative fracture evaluation from Ultrasonic imaging Hassi Messaoud Field Algeria Mourad Kourta* Peter Jeffreys* Hacene Attoui** Salah Mekmouche** * Schlumberger Oilfield Services Hassi Messaoud ** Sonatrach Production Division Hassi Messaoud Summary : The Ultrasonic Borehole Imager tool (UBI*) has over the years become established as an essential measurement for both geological and geomechanical evaluation in the low porosity Cambrian sandstones of the Hassi Messaoud Field Algeria. Horizontal wells are now being drilled to develop these fractured reservoirs and near-borehole geological imaging is providing an in-situ measurement of the sedimentary structures fractures and faults. It is usually possible to determine
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Fracture Mapping Using Microseismic Monitoring Data Recorded from Treatment Well – Results Based on 20 Hydro-Fracturing Jobs
Authors C. Maisons, E. Fortier, E. Gaucher and P. KaiserA33 Fracture mapping using microseismic monitoring data recorded from treatment well – Results based on 20 hydro-fracturing jobs Abstract 1 To stimulate their oil recovery oil companies carry out hydraulic fracturing jobs for which the fracture characterization as fluid path is crucial. Microseismic monitoring of such experiments is used for fracture mapping; nevertheless monitoring from treatment well is still a challenge. Over these last five years using the field experience gained over 20 jobs we managed to collect a significant database/catalogue of frac jobs results monitored from the injection well (treatment well). Various configurations of the tools in the reservoirs
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Discrete Fracture Network Prediction – A Case Study from an Ordovician Reservoir, Illizi Basin, Algeria
Authors S. Bland, D. Roques, M. Rekaiba, J. Hearne and R. HaftbaradaranA34 DISCRETE FRACTURE NETWORK PREDICTION – A CASE STUDY FROM AN ORDOVICIAN RESERVOIR ILLIZI BASIN ALGERIA 1 S. BLAND 1 D. ROQUES 1 M. REKAIBA 2 J. HEARNE 3 and R. HAFTBARADARAN 3 1 Midland Valley 14 Park Circus Glasgow G3 6AX UK ²Organe d’Operating Conjoint SONATRACH-BHP BILLITON Base Red Med BP 509 Route d’In Amenas Hassi Messaoud Algerie ³Organe d’Operating Conjoint SONATRACH-BHP BILLITON c/o BHP Billiton Petroleum Neathouse Place London SW1 1LH UK Introduction Fractures comprise a significant issue in many Algerian reservoirs. Well seismic and modelling data is all commonly available for fields in or about to enter
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Gas Potential and Prospectivity in Ahnet-Gourara Basin, Algeria
Authors F.Z. Mahsas and A. RahmaniB01 Gas potential and prospectivity in Ahnet-Gourara Basin Algeria Mme F.Z Mahsas Senior Geologist & A.Rahmani Exploration Manager Ahnet-Gourara Basin - Exploration Division Avenue du 1er Novembre 35 000-Boumerdes-Algeria Abstract : Ahnet- Gourara basin is located in the central part of Algeria 600 Km to the south from Hassi R’mel plant and covers 12 1260sq.Km included 17 blocks. The exploration in this part of the Saharan platform began in 1950’s but initial efforts were stopped following the oil discoveries in Illizi basin Eastern Sahara and hampered by the no existence of facilities at that time . The majority of exploration
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Deep Structure of the Chott Jerid trough Southern Tunisia
Authors H. Gabtni, C. Jallouli, K.L. Mickus, H. Zouari and M.M. TurkiB02 DEEP STRUCTURE OF THE CHOTT JERID TROUGH (SOUTHERN TUNISIA) 1 H. GABTNI 1 2 C. JALLOULI 1 K.L. MICKUS 3 H. ZOUARI 2 and M.M. TURKI 1 1 Département de Géologie Faculté des Sciences de Tunis University Tunis El Manar 2092 Manar II 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 MO 65804 KEY WORDS: North Africa - Southern Tunisia - Chott Jerid Trough - Deep structure SUMMARY: The surface monotony and ambiguous structure of the Chott Jerid (low topographic
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Offshore Libya – Regional Geological Framework, Proven and Possible Hydrocarbon Systems
Authors P.B. Gibbs, E.R. Brush and J.C. FidukB03 OFFSHORE LIBYA – REGIONAL GEOLOGICAL FRAMEWORK PROVEN AND POSSIBLE HYDROCARBON SYSTEMS Abstract 1 The geological framework of the Libyan offshore area is for the most part poorly known due in part to a lack of recent hydrocarbon exploration activity in all but the western area. Geological trends are projected into the offshore from the adjacent onshore areas where an extensive database exists. Sequential paleogeographic maps are presented that demonstrate the geological evolution of the area from the Paleozoic to the late Tertiary. Expected trap types reservoir and source intervals are described and the proven and possible hydrocarbon systems are
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Subsidence Analysis at the Western Margin of Cyrenaica Platform, NE-Libya
More LessB04 SUBSIDENCE ANALYSIS AT THE WESTERN MARGIN OF CYRENAICA PLATFORM NE-LIBYA 1 Abstract Geological and geophysical data from a number of exploration wells and many seismic surveys provide encouragement for understanding the structural and stratigraphic history of the western margin of Cyrenaica Platform. The area of study contains a very thick preserved sequence of sedimentary rocks of predominantly shallow marine origin ranging from Late Cretaceous to Tertiary in age. To define the structural history and better understanding of sedimentation in this area reconstruction and analysis of the geological history of the basin is essential. A backstripping technique has been used
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3D Inversion of Aeromagnetic Data for Basement Mapping of Hassi Berkine – Illizi Basins, Algerian Sahara
Authors N. Bournas, H. Boubekri, L. Douidi, J.D. Fairhead and J. JacquesB05 3D INVERSION OF AEROMAGNETIC DATA FOR BASEMENT MAPPING OF HASSI BERKINE – ILLIZI BASINS ALGERIAN SAHARA 1 N. BOURNAS 1 H. BOUBEKRI 2 L. DOUIDI 3 J.D. FAIRHEAD 4 AND J.M. JACQUES 4 1 University of Boumerdes Department of Geophysics Ave de l’independence Boumerdes 35000 Algeria 2 Univeristé de Bab Ezzouar Algeria 3 SONATRACH Algeria. 4 GETECH U.K. Abstract 2D and 3D inversion techniques of aeromagnetic data are playing an important role in the interpretation routine by providing rapid estimates of magnetic sources location and their spatial distributions. For basement areas these techniques are generally aimed to detect magnetic
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Structural Controls and Seismic Uncertainties in the Exploration of the Mid-Mature Berkine Basin
Authors J. Machin, J.M. Jauregui, R. Mouaici, D. Kerboub, A. Chambers and E. FigariB06 STRUCTURAL CONTROLS AND SEISMIC UNCERTAINTIES IN THE EXPLORATION OF THE MID-MATURE BERKINE BASIN Introduction 1 J. MACHIN 1 J.M. JAUREGUI 1 R. MOUAICI 2 D. KERBOUB 2 A. CHAMBERS 1 and E. FIGARI 1 ¹Repsol YPF Exploración S.A. Paseo Castellana 278 p.b. 28046 Madrid Spain ²Sonatrach Exploiration Avenue du 1er Novembre BT.C BP 68 M Boumerdes 35000 Algeria The Berkine basin has become the most successful basin in Algeria during the last fifteen years because of the oil discoveries have increased recoverable reserves up to 10 BBMO. The Berkine basin located in the Eastern part of Algeria overlies on
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Tectonics and Subsidence Evolution of the Sirt Basin, Libya
Authors J.D. van Wees, A.M. Abadi, P.M. van Dijk and S.A.P.L. CloetinghB07 TECTONICS AND SUBSIDENCE EVOLUTION OF THE SIRT BASIN LIBYA Abstract and Introduction 1 Backstripping analysis of 225 wells located within the Sirt Basin (Fig. 1) provide new constraints on the Sirt Basin development. Four coherent tectonic phases from Late Jurassic to present. The presentation of contour maps of subsidence and crustal stretching allows to visualize spatial and temporal stretching migration. A close match is observed with stretching phases documented for other African Basins consistent with discrete phases in the opening of the Tethys and Atlantic. Rifting and reactivation appears to be primarily controlled by the orientation of the basin
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