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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
1 - 50 of 100 results
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Prestack Seismic Inversion for Sw Modeling
A01 PRESTACK SEISMIC INVERSION FOR SW MODELING 1 B. BANKHEAD 1 A. SENA 1 J. MARTIN 3 RAMON S. CARDENAS HERNANDEZ 2 K.G. ROSAS LARA 2 G. VELASCO VASQUEZ 2 and E. MENDEZ HERNANDEZ 2 1 Veritas DGC Inc. 10300 Town Park Houston Texas 2 Pemex Exploracion y Produccion Villahermosa Tabasco 3 Veritas DGC Ltd Crompton Way Crawley UK RH10 9QN Abstract A workflow was developed as part of a field development project with the objective of building seismically constrained reservoir models of porosity and Sw while retaining the vertical resolution of the well log data and the spatial resolution
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Simultaneous Elastic Inversion Within a Reservoir Modelling Environment
Authors Y. Freudenreich, P. Lanfranchi, S.J. Pharez and C. ReiserA02 SIMULTANEOUS ELASTIC INVERSION WITHIN A RESERVOIR MODELLING ENVIRONMENT 1 Introduction It has been clear since the advent of 3D seismic that there is a great deal of information contained in the modern seismic survey. Advances in recent years now provide us with accurate depth images in areas complex structure; seismic facies and attribute analysis can help us identify geological variations; acoustic and elastic impedance help us to identify stratigraphy rock properties and fluid content; and multi-component technology is leading to fracture identification and rock property analysis. All of these properties assist in building a more accurate and common earth
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Application of 3D CRS Stacking to Enhance Imaging of Sparse 3D Datasets
Authors G. Gierse, H. Trappe, R. Coman, S. Robinson, M. Owens and E. Møller NielsenA03 APPLICATION OF 3D CRS STACKING TO ENHANCE IMAGING OF SPARSE 3D DATASETS Introduction In time domain seismic imaging the NMO/DMO stacking technique has been dominant for many decades. However the simple subsurface model of the NMO stack the loss in resolution by the DMO process and the dependence on a user-derived velocity model has motivated the search for alternative time domain imaging methods. 1 H. TRAPPE 1 R. COMAN 1 G. GIERSE 1 S. ROBINSON² M. OWENS² and E. MØLLER NIELSEN³ 1 TEEC Burgwedeler Str. 89 30916 Isernhagen Germany ²Anadarko Algeria Company LLC 1 Harefield Road Uxbridge UB8 1YH
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Borehole-Integrated Seismic Processing, Algeria
Authors L. Bubeqi, R. Walia, K. Brandt, R. Whittaker and R. DuthieA04 BOREHOLE-INTEGRATED SEISMIC PROCESSING –ALGERIA L. BUBEQI 1 R. WALIA 1 K. BRANDT 1 R. WHITTAKER 2 and R. DUTHIE 3 Summary 1 1 CGG Canada Services Ltd. 2 First Calgary Petroleums Ltd. 3 VSfusion First Calgary Petroleums Ltd. (FCP) along with its partner Sonatrach (National oil company of Algeria) has drilled several successful exploration wells in the Ledjmet Block 405b of the Berkine basin Algeria within the last two years (Fig.1). 2D data of different vintages could not provide an accurate interpretation; therefore two 3D seismic surveys (~850 sq km) using vibroseis 100-fold parallel-geometry were acquired. This acquisition geometry
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Onshore Imaging through Gas Using Converted Shear Waves – Case Study from Algeria
Authors A. Laake, J. Brunelliere, E. Loubens, F. van Kleef, S. Agounizera and M. BoubekeurA05 ONSHORE IMAGING THROUGH GAS USING CONVERTED SHEAR WAVES – CASE STUDY FROM ALGERIA Summary 1 Structural imaging of thrusted gas reservoirs is problematic with P-waves alone because of attenuation and scattering. Converted shear waves are significantly less affected by attenuation and scattering. However converted shear-wave data (PS) usually show a lower signal-to-noise ratio than compressional wave data (PP). Therefore the combination of PP and PS data quality is poor. The recording of the full 3C data also allows for directional filtering which partially suppresses crossline scattered energy present in PP data. A case study from Algeria confirms that PS
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A Method for Improving Vibroseis Productivity While Preserving Data Quality
Authors J.J. Postel, J. Meunier, T. Bianchi and A. DepeyrasA06 A METHOD FOR IMPROVING VIBROSEIS PRODUCTIVITY WHILE PRESERVING DATA QUALITY Abstract This presentation describes the outcome of a research program conducted on vibroseis harmonic noise reduction. It details the results of the acquisition and processing of a 3D test recorded in Egypt. Introduction 1 Eight years after its introduction by Petroleum Development Oman in 1996 the slip sweep method which “consists of a vibrator group sweeping without waiting for the previous group’s sweep to terminate” is still hardly used outside Oman. Data contamination by harmonic noise generated by the method is responsible for this situation. Various noise reduction techniques
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Seismic Attributes Study Used in the Direct Hydrocarbon Detection, Case History in the Souh Algerian Sahara
Authors J. Ferahtia and N. DjarfourA07 SEISMIC ATTRIBUTES STUDY USED IN THE DIRECT HYDROCARBON DETECTION CASE HISTORY IN THE SOUTH ALGERIAN SAHARA 1 Abstract The zone of interest is located in an important oil and gas zone; its position near Berkine and Illizi basins makes it very important. Our study is based on the data collected on two seismic lines according to the lines A and B and which they cut across on well 2. The present work based on the study of the contribution of the seismic attributes in particular the amplitude attribute presented by the AVO method in the direct hydrocarbons detection. The
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Evolving Seismic Technologies Provides an Improved Understanding in the In Salah Gas Reservoirs, Central Algeria
More LessA08 EVOLVING SEISMIC TECHNOLOGIES PROVIDES AN IMPROVED UNDERSTANDING IN THE IN SALAH GAS RESERVOIRS CENTRAL ALGERIA 1 Abstract The In Salah Gas project is a phased development of seven gas fields located in the Ahnet Basin in central Algeria. Northern three fields of the project developed initially and project delivered its first gas June 2004. The old nature of ISG Paleozoic reservoirs are characterized by hard acoustic impedance high velocity and high density. ISG seismic data are not heavily contaminated by multiple reflection noise. The Krechba and Reg fields are covered by relatively good 3D seismic data whilst the Teguntour
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Depositional Environment and Sequence Stratigraphy of the Strunian-Carboniferous Series, Tassili N'Ajjer Outcrops, Algeria
Authors S. Chelbeb and R. MouaïciA09 DEPOSITIONAL ENVIRONMENT AND SEQUENCE STRATIGRAPHY OF THE STRUNIAN-CARBONIFEROUS SERIES TASSILI N’AJJER OUTCROPS ALGERIA 1 S. CHELBEB and R. MOUAÏCI Sonatrach Bourmedes Algeria After the recent years discoveries the upper Devonian-Carboniferous sandstone units appear to hold significant hydrocarbon reserves in Berkine basin. However the lack of a palaeogeographical evolution model constrained with coherent biostratigraphical data makes any reservoir identification and correlation arguable. In this paper we present the results of a detailed outcrops analysis carried out in the Tassili N'Ajjers and the depositional models interpreted which will constitute a substratum for the subsurface study. In the studied area the Strunian
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Reservoir Architecture of the Upper Triassic Sediments from the Zarzaitine Outcrops (Algeria) – A Fluvio-Lacustrine Model
Authors R. Eschard, B. Hamouche and S. BouquinA10 RESERVOIR ARCHITECTURE OF THE UPPER TRIASSIC SEDIMENTS FROM THE ZARZAITINE OUTCROPS (ALGERIA) – A FLUVIO- LACUSTRINE MODEL 1 B. HAMOUCHE¹ R. ESCHARD² and S. BOURQUIN³ ¹Sonatrach CRD ²Institut Français du Pétrole corresponding author ³Geosciences Rennes UMR 6118 du CNRS Université de Rennes 1 In the Algerian basins the dynamic of the Triassic fluvial systems was controlled by a complex interaction between tectonic and climatic factors. The basal fluvial sequences of the TAGI were deposited during a sagging phase of the basins with a low sedimentation rate during Upper Ladinian and Lower Carnian times. At that time the relief associated
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Evolution of Fluvial Style and Sequence Stratigraphy of the Triassic (Saharan Platform, Algeria)
By B. FekirineSummary A11 Evolution of fluvial style and sequence stratigraphy of the Triassic (Saharan Platform Algeria) Berrached FEKIRINE SONATRACH CRD Avenue du 1 er novembre BOUMERDES 35000 ALGERIA The Triassic continental sediments of the Saharan platform stratigraphically related to Upper Carnian-Rhaetian are bounded below by the angular unconformable contact on the Paleozoic basement and above by the Early Jurassic carbonate D2 horizon and its lateral correlative. Continental sequence stratigraphic principles applied to subsurface core and well log sections and based on careful examination of vertical and lateral facies relationships paleosol type distribution and maturity aided in the determination of three depositional
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A Sedimentological, Diagenetic and Palynological Description of the Carboniferous Section in RKF Field, Berkine Basin, Algeria
Authors N. Sabaou, T. Bartrina, A. Alaminos, A. James, G. Paintal and N. AlemA12 A SEDIMENTOLOGICAL DIAGENETIC AND PALYNOLOGICAL DESCRIPTION OF THE CARBONIFEROUS SECTION IN RKF FIELD BERKINE BASIN ALGERIA ABSTRACT 1 N. SABAOU 1 T. BARTRINA 2 A. ALAMINOS 2 A. JAMES 1 G. PAINTAL 1 and N. ALEM 3 1 Badley Ashton and Associates Ltd. Winceby House Winceby Horncastle Lincolnshire LN9 6PB UK 2 CEPSA Ribera del Loira 50 28042 Madrid Spain 3 Sonatrach-CRD Boumerdes 35000 Algeria Sedimentological diagenetic and palynological description of the Carboniferous section (RKF Sands) was carried out on one RKF recent well. This study allows an improved understanding of the depositional environments and the architecture of the
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Rhourd Nouss Field and Zarzaitine Outcrops (Algerian Sahara) – Triassic Reservoirs Architecture and Sequence Stratigraphy
Authors N. Maache, A. Hamel and M. BenhamoudaA13 RHOURD NOUSS FIELD and ZARZAITINE OUTCROPS ( Algerian Sahara) Triassic Reservoirs Architecture and Sequence Stratigraphy A. HAMEL* N. MAACHE *& M. BENHAMOUDA** *Petroleum Engineering and Development- Sonatrach - ALGERIA **Centre de Recherche et Developpement - Sonatrach - ALGERIA Abstract: Rhourd Nouss gas with condensat field is producing from Triassic sandstones (Fig.1a). An excellent core coverage enables detailed study which shows a cyclic depositional pattern with mainly fluvial sandstones. one corresponding to Rhourd Nouss reservoirs. As sediments came from the south-west proved by NE paleocurrent directions the fluvial series thicken northern from Zarzaïtine to Rhourd Nouss. In Zarzaïtine outcrop (Fig.
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Algiers Pliocene Ria – A Messinian Canyon Filled by Gilbert Delta Complexes – A Preliminary Analyis
Authors J.L. Rubino, N. Haddadi, G. Clauzon, O. Parize and H. NailiA14 ALGIERS PLIOCENE RIA – A MESSINIAN CANYON FILLED BY GILBERT DELTA COMPLEXES – A PRELIMINARY ANALYSIS 1 J.-L. RUBINO 1 N. HADDADI 2 G. CLAUZON 3 O. PARIZE 4 and H. NAILI 5 1 Total CSTJF Pau France 2 Total Paris France 3 Cerege Université de Provence Aix en Provence France 4 ENSMP Fontainebleau France 5 Sonatrach Boumerdes present address: ENSMP Fontainebleau France In relationships with the Messinian Salinity Crisis the whole Mediterranean basin margins and their hinterland experienced a very deep fluvial overincision followed by a rapid lower Pliocene marine flooding. This succession of events leads to define
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Sedimentology of the Cambro-Ordovician of the Bled El Mass Outcrops
Authors G. Desaubliaux, E. Portier, N. Fernandes, D. Achache and S. Benkhenouche� A15 �������������� ��� ���� ������������������ ��� ��������������������������� � �� �������������� � ������������ � �������������� � ����������� � ����������������� � � ������������������������������� � ��������������������� � ���������� ���������� � �������������������������������������������������������������������������������������������������������������� ���������������������������������������������������������������������������������������������������������������������� ��������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������������� ������������������������������������������������� �������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������� ����������� ��������� ������� ������� ������ ���� ���� ������ ��������� ���� �������������� ����������� ���� ����� ��� ����������� ������������ ����� ��������������� ����������� ���� ����������� ������� ���� ������� ������ ������ ����� ���� ������������ ������������� ������������������� ��������������� ��� ���� ���������� �������� �������������� ����������� ��������������������������������������������������������������� ������������������������������������������ ���������� ���� �������� ��� ���� ������� �������� ������ ����� ��� ����� ������ ���� ���������� ����������� ��� ���� ������ ���������������������������������������������������������������������������������������������������������������� �������������������������������������������������������������������������������������������������������������������� ������������������������������������������������������������������������������������������
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How FMI Logs Can Help in Characterising Depositional and Diagenetic Facies in Carbonate Reservoirs – Examples from Two Libyan Fields
Authors R. Di Cuia, B. Caline, J.P. Leduc and L. KnechtA16 How FMI logs can help in characterising depositional and diagenetic facies in carbonate reservoirs - examples from two Libyan fields Methodology 1 DI CUIA R. (+) CALINE B. (§) LEDUC J.P. (§) KNECHT L. (#) (+) G.E.Plan Consulting via M.M. Boiardo 44100 Ferrara ITALY [email protected] The complete characterisation of depositional and diagenetic facies is an important step in the process of understanding the reservoir potentiality of carbonate reservoirs. Facies distribution diagenetic characteristics porosity types and fracture/stylolites identifications are key parameters to correctly describe carbonate reservoirs. The absence of sufficient “direct subsurface information” (cores) is often a limitation in this
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Seismic-Based Risk Evalution at Hydrocarbon Reserves Estimation
Authors N.L. Ivanova and A.G. AverbukhA18 SEISMIC-BASED RISK EVALUATION AT HYDROCARBON RESERVES ESTIMATION 1 Summary. This paper highlights a technique used to assess geologic risk associated with different type uncertainties in estimating the hydrocarbon reserves. We consider uncertainties caused by structural mapping inaccuracies uncertain values of oil/water (gas/oil) contact depths and reservoir capacity parameters used in estimating hydrocarbon reserves. Our technology is based on stochastic simulation and permits quantitative determination of the risk degree and estimation of possible range of hydrocarbon reserves within potential areas explored with seismic and well logging surveys. Introduction. There are many aspects of risk ensuing from uncertainties of oil and
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Real Time Performance Prediction Using Seismic Attributes and Horizontal Well Data – Krechba Field, Algeria
Authors M.M. Bowler, A. Mazouzi, H. Nada, E. Robbana and M. OkwelegbeA19 REAL TIME PERFORMANCE PREDICTION USING SEISMIC ATTRIBUTES AND HORIZONTAL WELL DATA – KRECHBA FIELD ALGERIA Abstract 1 Located in central Algeria The In Salah Gas Project is a phased eight field gas development reservoired in Devonian and shallower Carboniferous reservoirs that lie within the District 3. The northern most field being developed the Krechba field lies some 520 km south of the Hassi R’Mel “super-giant” gas field (Figure 1) which provides the nearest infra-structure for gas export. The field is being developed with a series of horizontal wells for gas production and down dip CO2 sequestration. In order to
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An Integrated Geocellular Reservoir Modeling and Calibrating Approach Using Condor Software – Field Case Study
By J. ThilliezA20 AN INTEGRATED GEOCELLULAR RESERVOIR MODELING AND CALIBRATING APPROACH USING CONDOR SOFTWARE – FIELD CASE STUDY Abstract 1 Groupement Berkine (GB) a Sonatrach-Anadarko Association is operating several oil fields in the Berkine Basin Algeria. The reservoirs are producing undersaturated volatile to light oil from the Trias argilo-gréseux inférieur (TAGI) formation. The depositional environment consists of a recurrent sequence of vertically stacked and laterally continuous and contiguous fluvial channel sands. An intensive well test campaign was undertaken prior first production to evaluate reservoir compartmentalization. The reservoirs showed a high degree of connectivity in the main areas of the fields with communication
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Using Sector Models to Optimize Field Development Planning
Authors M. Abd Elsalam, D. Paul, M. Baydoun and M. A‘GawadA21 USING SECTOR MODELS TO OPTIMIZE FIELD DEVELOPMENT PLANNING ٍSummary Fine scale sector models have been used to optimise offshore field developments in Egypt. These models have been used to validate geological interpretations and petrophysical data used in the full field models and to optimise completion strategy. 1 M. ABD ELSALAM D. PAUL M. BAYDOUN and M. A/GAWAD Leading edge seismic processing and interpretation techniques have been utilized in defining the structural and facies models for the fields. Petrophysical data from an extensive logging suite has been populated through the models stochastically by zone and by facies to capture the
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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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Advances in the Structural Model of the Reggane-Ahnet Region of Algeria
Authors A. Chambers, I. Polonio, M. Baene, R. Ferrando and E. FigariB08 ADVANCES IN THE STRUCTURAL MODEL OF THE REGGANE-AHNET REGION OF ALGERIA Abstract : 1 A. CHAMBERS I. POLONIO M. BAENA R. FERRANDO and E. FIGARI Repsol-YPF Exploración SA Paseo de la Castellana 280 28046 Madrid Spain A number of hydrocarbon accumulations have been discovered during the last 40 years the principal reservoirs being the Ordovician Units III-IV and Lower Devonian. These include the Reggane Tiouliline and Azrafil discoveries in the eastern Reggane basin and the M’Sari Tigfermas and Tit discoveries in the western Ahnet basin. Repsol-YPF and partners have been actively exploring in this region since 2000 with the
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The Petroleum Interest of the Algerian Offshore Domain
Authors N. Khennaf, B. Addoum, A. Ghaffar, M.S. Benabdelmoumene and F. TaharbouchetB09 THE PETROLEUM INTEREST OF THE ALGERIAN OFFSHORE DOMAIN 1 N. KHENNAF B. ADDOUM A. GHAFFAR M.S. BENABDELMOUMENE and F. TAHARBOUCHET Sonatrach Activite Amont Division Exploration Avenue Du 1er Novembre Iap Bt. C Bp.68 M - Boumerdes 35000 Algerie ABSTRACT The Algerian offshore domain presents a total area of 93 500.5 Sq km corresponding to the south boundary of the Alboran basin to the west and the Algero-provençal basin to the east. The coast extends from east to west over 1200 Kms. More than 20 000 Kms of 2D seismic data acquired from 68 to 77 and about 9 000
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Gas Exploration in Mediterranean Sea, Egypt
By M.S. FahimB10 GAS EXPLORATION IN MEDITERRANEAN SEA EGYPT SUMMARY 1 The recent success of the gas exploration in the Mediterranean province is the result of the aggressive exploration efforts since 1960s. Through time and as indicated by statistical analysis exploration followed different approaches and concepts. In early days the targets in the area were Cretaceous reservoirs. However drilling results proved that Mesozoic targets are deeper than expected and also indicated the high potentiality of Miocene reservoirs. During 1990s as a results of introducing GAS CLAUSE in the Petroleum Exploration Agreements and also due to methodological improvements many Miocene & Pliocene gas
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Exploration Evaluation of a Block in the Mediterranean Sea, Offshore Western Algeria
Authors J.E. Iliffe, R. Humphreys, B.W. Jones, H. Nada and J.K. WilliamsB11 EXPLORATION EVALUATION OF A BLOCK IN THE MEDITERRANEAN SEA OFFSHORE WESTERN ALGERIA 1 J.E. ILIFFE R. HUMPHREYS B.W. JONES H. NADA and J.K. WILLIAMS The offshore margin of Western Algeria was evaluated for its hydrocarbon potential as part of a licence round. Offshore data consisted of three wells archaic seismic and DSDP drilling data. Additional data from the onshore Cheliff Basin was also used. A regional “bottoms-up” approach to the evaluation was employed with the available data starting with the fundamental tectonic setting and ages of the key events. Regional GDE’s were developed and source rock reservoir and seal
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Wave Equation Depth Migration in North Africa Deep Waters
Authors S. Grion, R. Leggott and R. MorganB12 WAVE EQUATION DEPTH MIGRATION IN NORTH AFRICA DEEP WATERS Summary 1 This paper focuses on recent advances in wave equation migration algorithms and their implications for deep water seismic exploration offshore Egypt. The analysis of 2D Kirchhoff pre-stack depth migrated (PSDM) data reveals complex structures that are likely to benefit from wave equation migration. Ray tracing and impulse responses are used to assess these benefits. Introduction Seismic imaging methods can be divided into two broad categories. Kirchhoff methods rely on ray tracing to estimate traveltimes through a velocity model. These traveltimes are then used to reposition data to its
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The in Salah CO2 Storage Project – Future Challenges
Authors F.A. Riddiford and A. TourquiB13 THE IN SALAH CO2 STORAGE PROJECT – FUTURE CHALLENGES Technical Theme: 11 - Environment and HSE Management 06 - North African case studies Abstract The multi-field In Salah Gas(ISG) project started production on schedule mid-2004. As part of the development ISG also implemented a large scale CO2 capture and storage project with the produced gas stream being stripped of its CO2 content before export and the stripped CO2 stream injected into 3 horizontal injection wells. Placement of the CO2 is into the aquifer leg of the Krechba field where ~50 mmscf/d of CO2 is being re-injected daily. 1 F.A.
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Which Environmental Strategy for the Exploraion Activity Within Sonatrach?
Authors A. Fodil Cherif and A.L. BenmeberekB14 WHICH ENVIRONMENTAL STRATEGY FOR THE EXPLORAION ACTIVITY WITHIN SONATRACH? 1 ABSTRACT The pressures on the Oil and Gas Companies for the environmental respect as wel as local than global level are more and more strong. The legal and economic consequences of an industrial accidents and pollutants releases are more stern. In answer to this situation these companies developed different strategies aiming to control their pollutant releases to reformulate their processes procedures and products; in other words to review their way to make things. Like an other Oil Companies SONATRACH gives a great importance for the environment management that constitutes
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Hazards Caused by a Drilling Fluid in Case of Loss Circulation; what is the Solution?
By M. KadaB15 HAZARDS CAUSED BY A DRILLING FLUIDS IN CASE OF LOSS CIRCULATION WHAT IS THE SOLUTION? 1 Abstract In this 21st century the sustainable development takes dimension in witch every development strategy must take in considiration different environment aspects expected to compromise the well being of futur generations. The pollution generated by the oil and gas industries like drilling operations can have a serious and irreversible consequences on the environment specially those linked to the drilling fluids uses. The drilling operation site is known to generate a ponctuel pollution problem however this one can be propagated outside the limits of
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Exceptional Horizontal Well Performance Delivered Through Multi-Disciplinary Teamwork
Authors M. Taylor, L. Foster, A. Aidoo, J. Castle-Smith and J. MezdourB16 EXCEPTIONAL HORIZONTAL WELL PERFORMANCE DELIVERED THROUGH MULTI- DISCIPLINARY TEAMWORK ABSTRACT 1 FOSTER L. AIDOO A. CASTLE-SMITH J. MEZDOUR J. 2 nd North African/Mediterranean Petroleum & Geosciences Conference & Exhibition Algiers 10 – 13 April 2005 TAYLOR M. In Salah Gas BP513 Hassi-Messaoud Algeria. Krechba is one of seven fields in the In Salah Gas Development in District 3 of Algeria. Initial planning called for up to 25 vertical wells to develop the thin Carboniferous reservoir. To reduce development costs feasibility studies were performed on the option of drilling 6-8 horizontal wells which included 2-3 CO2 injection wells. This option
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Egyptian Deepwater Development, a Case Study
More LessB17 EGYPTIAN DEEPWATER DEVELOPMENT A CASE STUDY Summary The Burullus Gas Company a subsidiary of the Rashid Petroleum Company (Rashpetco) operates the West Delta Deep Marine Concession. (WDDM) on behalf of partners: Egyptian Government Petroleum Cooperation (EGPC) BG Group and Petronas. This paper describes the first deepwater offshore completion operations conducted in Egypt as part of the Scarab/Saffron development and the lesson learned for the future deepwater development in Egypt. The two fields are located in water depths ranging from 400 to 650m and are situated some 90km offshore the Nile Delta. 1 The development consists of two phase drilling
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