- Home
- Conferences
- Conference Proceedings
- Conferences
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
100 results
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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.
-
-
-
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
-
-
-
Sedimentology of the Cambro-Ordovician of the Bled El Mass Outcrops
Authors G. Desaubliaux, E. Portier, N. Fernandes, D. Achache and S. Benkhenouche� A15 �������������� ��� ���� ������������������ ��� ��������������������������� � �� �������������� � ������������ � �������������� � ����������� � ����������������� � � ������������������������������� � ��������������������� � ���������� ���������� � �������������������������������������������������������������������������������������������������������������� ���������������������������������������������������������������������������������������������������������������������� ��������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������������� ������������������������������������������������� �������������������������������������������������������������������������������������������������������������� ����������������������������������������������������������������������������������������������������������������� ����������� ��������� ������� ������� ������ ���� ���� ������ ��������� ���� �������������� ����������� ���� ����� ��� ����������� ������������ ����� ��������������� ����������� ���� ����������� ������� ���� ������� ������ ������ ����� ���� ������������ ������������� ������������������� ��������������� ��� ���� ���������� �������� �������������� ����������� ��������������������������������������������������������������� ������������������������������������������ ���������� ���� �������� ��� ���� ������� �������� ������ ����� ��� ����� ������ ���� ���������� ����������� ��� ���� ������ ���������������������������������������������������������������������������������������������������������������� �������������������������������������������������������������������������������������������������������������������� ������������������������������������������������������������������������������������������
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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:
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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.
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
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
-
-
-
Contribution of Analogue Modelling for the Understanding of the Saharan Atlas Structure
By T. DjebbarB18 CONTRIBUTION OF ANALOGUE MODELING FOR THE UNDERSTANDING OF THE SAHARAN ATLAS STRUCTURE Abstract 1 The Saharan Atlas (Algeria) is an intracratonic mountain belt which developed at the southern margin of Tethys. It is 650 km long and varies in width from 90 to 140 km. Topographic elevations reach 2 000 m. It forms part of the Atlas orogenic system which occurs in North Africa from Morocco to Tunisia. During the Mesozoic up to 10 000 m of mixed continental and marine sediments were deposited unconformably above the Palaeozoic basement. This basement contains NE-SW and NW-SE Variscan fabrics and older
-
-
-
Lower Devonian Combined Traps – Ahnet Basin – Western Sahara
Authors S. Boukhallat and A. RahmaniB19 LOWER DEVONIAN COMBINED TRAPS – AHNET BASIN – WESTERN SAHARA The Ahnet basin located in the western part of the Saharan Platform (figure1) exhibits several features witnessing very important and complex structural history . Actually various trends of large scale folds can be seen in outcrops and subsurface. This makes the area very exciting for hydrocarbon exploration. Indeed the first well that penetrates the stratigraphic column of the basin was realized 1950’s. Since exploration was focused on Ahnet basin several gas accumulations were discovered in various reservoir formations of several ages like the Ordovician Lower Devonian and Tournaisian –Strunian
-
-
-
Source Rocks of the Southeastern Constantine Sedimentary Basin (Eastern Saharan Atlas, Algeria)
By E.M. BelhadjB20 Source Rocks of the Southeastern Constantine sedimentary basin (Eastern Saharan Atlas Algeria) Elhadi Mustapha BELHADJ Sonatrach-CRD ;1 Avenue du 1 er novembre Boumerdes 35000 Algeria E-mail : [email protected] Tel : 024 81 56 01 Fax: 024 81 11 20 Summary Various organic matter rich strata within the argillaceous carbonate series of the Cretaceous-Tertiary basin of the southeastern Constantine are described and investigated. These strata stratigraphically related to the Cenomanian-Turonian boundary zone and the Upper Albian sections offer the most hydrocarbon potential characteristics and are regarded as having generated the oil from Djebel Onk Ras Toumb and Guerguit El-Kihal fields.The
-
-
-
The Hydrocarbon Source Potential of the Palaeozoic Rock of theGhadames Basin, NW Libya
Authors M.S. Hrouda, R.V. Tyson and P. FarrimondB21 THE HYDROCARBON SOURCE POTENTIAL OF THE PALAEOZOIC ROCK OF THE GHADAMES BASIN NW LIBYA Lower Silurian and Upper Devonian organic-rich “hot-shales” are the source of almost all Palaeozoic oils in North Africa and the Middle East. They are also developed in the Ghadames Basin and better understanding of their organic facies character and maturity is considered crucial for the future oil exploration strategy. To date the geochemical and 1 palynological data relating to hydrocarbon source potential are rather few and scattered just a limited number of publications and internal reports. The geochemical data (TOC pyrolysis and transmitted light microscopy
-
-
-
Dating a Reservoir Filling – A Case History from the Hassi Messaoud Field, Algeria
More LessEAGE 2 nd North African/ Mediterranean Petroleum & Geosciences Conference and Exhibition Algiers Algeria 10 - 13 April 2005 B22 Dating a reservoir filling : a case history from the Hassi Messaoud field Algeria Summary Djamel Boutoutaou Sonatrach Boumerdès-Algeria E-mail: [email protected] The characteristics of oils in the subsurface as well as the hydrocarbon filling history of the Hassi Messaoud Field were studied using geological organic geochemical fluid inclusion and PVT data. Geochemical signatures of present and paleo-petroleum distributions in combination with microthermometry of fluid inclusions are integrated in this study with the burial history modelling in order to understand the
-
-
-
Geochemistry of Organic Matter in the Upper Triassic Facies, Central Tunisia
Authors A. Arfaoui and M. MontacerB23 GEOCHEMISTRY OF ORGANIC MATTER IN THE UPPER TRIASSIC FACIES CENTRAL TUNISIA Unité de recherche « Géoressources Environnements naturels et Changements globaux » GEOGLOB code : 03/UR/10-02 1 Summary : Outcrop samples collected from Rheouis carbonates and shales in central Tunisia were analysed in order to evaluate their geochemical patterns. On the basis of biomarker maturity parameters (i.e. Ts/Tm 22S/(22S + 22R) of the C31 αβ-hopanes ratios 20S/(20R + 20S) and ββ/(ββ + αα) of C29 steranes…) this study suggest that the Carnian organic matter has already reached the stage of oil-generative window. This province could be a promising area
-
-
-
Berkine Basin Oils, Algeria – Geochemical Correlation by GC and Spectroscopic FTIR and SUVF
Authors A. Permanyer, J. Navarro, O. Abbas, C. Rébufa and J. KisterB24 BERKINE BASIN OILS ALGERIA – GEOCHEMICAL CORRELATION BY GC AND SPECTROSCOPIC FTIR AND SUVF 1 A. PERMANYER 1 J.NAVARRO 2 O. ABBAS 3 C. RÉBUFA 3 and J. KISTER 3 1 Dt. Geoquímica Petrologia i Prospecció Geològica Universitat de Barcelona . Barcelona Spain 2 Cepsa E.P. S.A. c/ Ribera del Loira 50. 28042-Madrid Spain 3 Université d’Aix-Marseille III CNRS UMR 6171 Marseille France Abstract FTIR and SUVF helped to define complementary parameters to show differences between oils of the Berkine Basin in Algeria. These differences are probably linked to different oil source rocks oil evolution and reservoir compartmentalization. Key
-
-
-
Palaeogeothermal Study of Idjeran M'Zab and Amguid-El Biod Hassi Messaoud Ridge (Central Sahara, Algeria) – Relationship with Deep Tectonics
More LessB25 PALAEOGEOTHERMAL STUDY OF IDJERAN M’ZAB AND AMGUID-EL BIOD HASSI MESSAOUD RIDGE (CENTRAL SAHARA ALGERIA) – RELATIONSHIP WITH DEEP TECTONICS The Algerian central Sahara consists of two ridges which extend in a submeridian 1 direction from the Hoggar to the Sahara Atlas. Gassi touil and Rhourde Nouss areas are located on the high Amguid el biod Hassi messaoud ridge in the triassic basin horsts. The tectonic study revealed two important tectonic phases (Hercynian and autrichian) that affected differently these two regions. The autrichian phase is noticeable in the Gassi Touil region especially as it is unusual in the saharian level
-
-
-
A Multi-Azimuth VSP Experiment for Fracture Orientation Detection, HMD Field Algeria
Authors F. Chegrouche and F. BabaiaB26 A MULTI-AZIMUTH VSP EXPERIMENT FOR FRACTURE ORIENTATION DETECTION HMD FIELD ALGERIA Abstract Natural micro-fractures are very important in the control of production in the hydrocarbon reservoirs. The presence of the vertical fractures in the rock mass causes the split of the incident shear wave into two approximately orthogonal components with different velocities. Splitting shear wave analysis permits the estimation of fracture orientation. 1 In the offset VSP experiment converted SV waves are generated with varying strengths at particularly all depths. Consequently the converted Sv waveforms partially overlap with direct P waveforms makes the separate event analysis difficult and inaccurate.
-
-
-
Reducing Uncertainties At An Early Stage – The Key to Minimize Development Risks in the Al-Jurf Field
More LessB27 REDUCING UNCERTAINTIES AT AN EARLY STAGE – THE KEY TO MINIMIZE DEVELOPMENT RISKS IN THE AL-JURF FIELD 1 Summary 1 The Al Jurf oil field located in the Sabratah basin offshore Libya was put on stream in 2003 after having drilled only three exploration and appraisal wells since discovery date thirty years earlier. In order to fine tune the second phase of the development but also to identify potential upsides it was necessary to tackle at an early stage the substantial subsurface uncertainties of the stacked carbonate reservoirs El Gueria and Chouabine. An appropriate drilling sequence combined with a
-
-
-
Surface Geochemistry – A Case Study of a New Risk Reduction Technology Applied in Algeria
Authors P. Harrington, N. Lee, D. Goold and H. StolpmannB28 Surface Geochemistry: A case study of a new risk reduction technology applied in Algeria 1 2 nd North African/Mediterranean Petroleum & Geosciences Conference & Exhibition Algiers 10 – 13 April 2005 NICOLA LEE BURLINGTON RESOURCES Inc. London UK PAUL HARRINGTON W.L. GORE & Associates Inc. Elkton Maryland USA DAVID GOOLD W.L. GORE & Associates Inc. Elkton Maryland USA HOLGER STOLPMANN W.L. GORE & Associates GmbH. Putzbrunn Germany In August of 2003 Burlington Resources Inc. (BURLINGTON) on behalf of the Block 402d Association comprising Burlington Resources Algeria LLC PetroSA and Sonatrach contracted W. L. Gore & Associates Inc. (GORE) to
-
-
-
Geophysical Techniques Used for the Structural Interpretation of the El Merk Reservoirs
Authors V. Sheppard, J. Boast, S. Tertag and B. KarbouaB29 Geophysical Techniques Used for the Structural Interpretation of the El Merk Reservoirs 1 V. SHEPPARD J. BOAST S. TERTAG B. KARBOUA Groupement Berkine Route de Cina BP 394 Hassi Messaoud Wilaya de Ouargla Algeria Summary Groupement Berkine is the operating organisation for the Sonatrach-Anadarko Association. All work is carried out in a purpose-built base camp with modern offices situated in Hassi Messaoud approximately 800km south of the capital Algiers. Groupement Berkine operates with employees seconded from both companies. Each staff technical position in the Groupement is performed on a rotational basis with employees working a 4-week-on / 4-week-off schedule.
-
-
-
Stratigraphic Analyses of the Lower Devonian Sequences, Reggane Basin, Southestern Algeria
Authors I. Polonio, R. Eschard, R. Ferrando, A. Chambers and E. FigariB30 STRATIGRAPHIC ANALYSES OF THE LOWER DEVONIAN SEQUENCES REGGANE BASIN SOUTHESTERN ALGERIA 1 The present study provides an integrated stratigraphy of the Lower Devonian of the southeastern Reggane Basin Bled El Mass. It is important to establish a standard section allowing an interregional correlation as well as an interpretation of single environmental conditions their changes through time and their geographical extent. Numerous sections have been investigated in this area in addition to data from other profiles in the basin. Investigation of the sedimentary sequences is based on an analysis of events. Initially many events are diachronous whereas others are difficult
-
-
-
The Impact of Chemostratigraphy in Algeria, Past Successes and Future Applications
Authors T.J. Pearce, J. Martin, K.T Ratcliffe, D. Lawton, A. Hughes and F. BessaB31 THE IMPACT OF CHEMOSTRATIGRAPHY IN ALGERIA PAST SUCCESSES AND FUTURE APPLICATIONS 1 T.J. PEARCE 1 J. MARTIN 1 K.T. RATCLIFFE 1 D. LAWTON 2 A. HUGHES 3 and F. BESSA 4 ¹Chemostrat Ltd. Units 3-6 Llanfyllin Enterprise Park Llanfyllin Powys SY22 5DD UK ²BHP Billiton Petroleum Ltd Neathouse Place London SW1V 1LH UK ³Burlington Resources Canary Wharf One Canada Square London E14 5AA UK 4 Division of Petroleum Engineering and Development Sonatrach/PED 8 Chemin du Reservoir Hydra Algiers Algeria Over the last 10 years chemostratigraphy has made a major impact on the correlation of one of Algeria most profilic
-
-
-
Devonian Stratigraphic Cycles and Depositional Environments in the Timimoun Basin (Algeria)
Authors C. Jardiné, E.K. Zemouri, T. Lecoq, C. Sontot, J.L. Rubino and H. ClaudeB32 DEVONIAN STRATIGRAPHIC CYCLES AND DEPOSITIONAL ENVIRONMENTS IN THE TIMIMOUN BASIN (ALGERIA) APPLICATION TO RESERVOIR LAYERING Stratigraphic cycles hierarchy could be used whatever the lateral facies change to establish confident reservoir layering even whit a poor core coverage. 1 C. JARDINE 1 E.K. ZEMOURI 2 T. LECOQ 1 CH. SONTOT 1 J.L. RUBINO 1 and H. CLAUDE 3 1 Total CSTJF Pau France 2 Sonatrach Boumerdes Algeria 3 IGAL Cergy-Pontoise France Successful exploitation of oil and gas reserves depends upon a good understanding and an accurate and integrated description of the reservoir. Knowledge of how reservoirs facies and their petrophysical
-
-
-
Lower Palaeozoic Stratigraphic Cycles from South Western Algeria – Comparison between Ougarta Ranges, Timmoun and Illizi Basins
Authors J.L. Rubino, S. Galeazzi and N. HaddadiB33 LOWER PALAEOZOIC STRATIGRAPHIC CYCLES FROM SOUTH WESTERN ALGERIA – COMPARISON BETWEEN OUGARTA RANGES TIMIMOUN AND ILLIZI BASINS 1 J.L. RUBINO 1 S. GALEAZZI 2 and N. HADDADI 3 1 Total CSTJF Pau France 2 Total UK Aberdeen UK 3 Total Paris France The last SGP 5 meeting held in Algeria in 2004 provides the opportunity to quickly analyse the lower Palaeozoic succession from Cambrian to Silurian in the Ougarta Ranges where it is well exposed. This succession can be first compare with coeval series developed in Subsurface in Timimoun basin and in turn with the classical succession known in
-
-
-
Hassi Messaoud Field Geomechanical Model & Its Applications
Authors M. Merad, S. Mekmouche and M. BenameurP01 HASSI MESSAOUD FIELD GEOMECHANICAL MODEL & ITS APPLICATIONS Abstract 1 M. MERAD¹ S. MEKMOUCHE² and M. BENAMEUR³ Geomechanical modeling has been shown to compress cycle time in well planning and potentially be applied to field development planning. Static modeling provides a prediction along chosen well path. A full 3D interactive process allows dynamic well planning to optimize drilling & production a new well path can be chosen to match production objectives and avoid sanding. Schlumberger experience in geomechanical modeling can help in well construction and field development planning in Hassi Messaoud field. Schlumberger experience in 3D interactive modeling can
-
-
-
Improved Static Corrections for Vibroseis Line NC151-V532 over Sand Dunes in Western Libya
Authors A.M.A. Ushah and N.R. GoultyP02 IMPROVED STATIC CORRECTIONS FOR VIBROSEIS LINE NC151-V532 OVER SAND DUNES IN WESTERN LIBYA Summary This paper deals with static corrections on seismic reflection profile over sand dunes in concession NC151 in western Libya. Two methods of computing field statics have been implemented and the results are compared after processing in Durham using ProMAX software. The refraction method in which field statics are estimated as half the plus time at each station and then adjusted to uphole data with linear interpolation yielded a significant improvement over the conventional method previously used which relies solely on interpolation of the near-surface velocity
-
-
-
Injectites and Early Post-Depositional Deformation of Precambrian Dolomite Rocks in the Huqf Super Group, Northern Oman
Authors P.C.H. Veeken and B. van MoerkerkenP03 INJECTITES AND EARLY POST DEPOSITIONAL DEFORMATION OF PRECAMBRIAN DOLOMITE ROCKS IN THE HUQF SUPER GROUP NORTHERN OMAN Abstract 1 P.C.H. VEEKEN* and B. VAN MOERKERKEN ** * Geops 29 Rue des Benedictins 57050 Le Ban St Martin France ** Geodisq Plantage Muidergracht 162 Amsterdam The Netherlands Syn-sedimentary and early post-depositional deformation in rocks of the Precambrian Hajir Formation have been investigated (Wadi Hajir Northern Oman). The following deformational features are observed: 1) thin-skinned tectonic deformation 2) lateral transition of faultplanes into flexures and folds 3) cross cutting fault directions 4) listric fault shapes and 5) a variety in fold
-
-
-
Geological and Prospective Peculiarity of Kapaz Field in Caspian Basin
By A. JavadovaP04 GEOLOGICAL & PROSPECTIVE PECULIARITY OF KAPAZ FIELD IN CASPIAN BASIN 4500.0 Abstract Location: Field Kapaz is located in the central part of the Apsheron-Pribalkhan threshold between the structures Azeri and Livanov-West in Caspian sea. Water depth variations changes from 90m in the east up to 130m in the west. (See attach Situation map) Azerbaijan Azeri Chirag Guneshli Deep:: AIOC; 120 000 b/d at Chirag (11 Wells); Azeri Phase 1 = 350 00 b/d (2004); 5 bnbbl rec. Reserves; Export to Supsa 4400.0 RUSSIA GEORGIA A R M E N IA AZERBAIJAN Lenkoran IRAN KAZAKHSTAN C A S P IA
-
-
-
The Geodynamic Evolution of the Algerian Western Offshore and Its Impact on the Structural Framework and the Hydrocarbon Potential
Authors L.H. Kheidri, S. Ziou and N. AbdelouahabP05 THE GEODYNAMIC EVOLUTION OF THE ALGERIAN WESTERN OFFSHORE AND ITS IMPACT ON THE STRUCTURAL FRAMEWORK AND THE HYDROCARBON POTENTIAL 1- Introduction The Algerian Western offshore belongs to the southern margin of the Western Mediterranean sea. It is located across the Algero-Provençal basin in the east and the South East Alboran basin in the west (fig. 1). 1 L.H. KHEIDRI S. ZIOU and N. ABDELOUAHAB SONATRACH/EXP/DES. Boumerdes. Algeria In spite of the existent seismic data (1969-77) no approach enable us to get a clear structural image and integrated within the general geologic framework of the Western Mediterranean sea. The acquisition
-
-
-
New Approach Study of Pre Upper Cretaceous Fractured Reservoir, Sirte Basin, Libya
More LessP06 NEW APPROACH STUDY OF PRE UPPER CRETACEOUS FRACTURED RESERVOIR SIRTE BASIN LIBYA INTRODUCTION 1 Tibisti Field is located in Concession 13 in the centre of the Sirte Basin Libya. It was discovered by I1-13 well in August 1962. The main producing horizon is the Pre Upper Cretaceous Sirte Group fractured quartz sandstone. The Tibisti Field has OOIP of more than 2 billion barrels and its cumulative production up to February 2004 is 78 MMBO. Following the field discovery a 35 well development drilling program concentrated on Tibisti’s main structural high. The productivity of these wells varied greatly and some
-
-
-
Depositional Environments and Large-Scale Sediment Architecture in the Upper Ordovician of the Murzuq Basin, SW Libya – Melaz Shugran and Mamuniyat Formations
Authors N.D. McDougall, K. Tawengi, J. Quin and J. Vila PontP08 Depositional environments and large-scale sediment architecture in the Upper Ordovician of the Murzuq Basin SW Libya (Melaz Shugran and Mamuniyat Formations) Ghat NC115 NC20 NC200 NC186 Qarqaf Arch NC190 NC187 Dr N.D McDougall *Khaeri Tawengi Jamie Quin and Judith Vila Pont Repsol Exploración 280 Paseo de la Castellana Madrid 28046 Spain *REMSA Floor 8 Tower 3 Dhat El Imad Tripoli Libya Introduction Respsol-YPF is the operator of Concessions NC115 NC186 NC187 NC190 and NC200 in the Murzuq Basin of SW Libya. An extensive drilling programme accompanied by coring and widespread use of image logs (FMI) together with seismic programmes
-
-
-
Imaging of Subsurface Structure beneath OBAMA Area, Japan Using Gravity Data
Authors H. Saibi, J. Nishijima and S. EharaP09 IMAGING OF SUBSURFACE STRUCTURE BENEATH OBAMA AREA JAPAN USING GRAVITY DATA 1 Abstract – Obama area Kyushu Island has one of the most promising geothermal fields in Japan and therefore the study of the basement structure contributes to the understanding of the geothermal reservoir features. Two gravity survey of the Obama area were conducted in 2003 and 2004 included 203 stations using Scintrex CG3-3M gravimeters. The deduced Bouguer anomaly is positive ranges from 10.2 mGals in northern part of Obama and 13.8 mGals in south and west-center parts of Obama. The relief of the basement is confirmed by Cordell
-
-
-
Using AVO Crossplot and Polarization Attributes to Identify Anomalies of Gas Effect
By A. KassouriP10 USING AVO CROSSPLOT AND POLARIZATION ATTRIBUTES TO IDENTIFY ANOMALIES OF GAS EFFECT Abstract 1 In this paper we study the causes of amplitude anomaly observed on true amplitude stacked seismic data in southern Algerian gas field using AVO crossplot and hodograms analysis. We present an example associated with Carboniferous gas sandstones in Sbaa 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 incidence angle and offset expressed by the gradient (G) that mostly depends on the contrast of Poisson’s
-
-
-
Sequence Stratigraphy, Halokinesis and Paleogeographic Evolution at the Cenomanian-Turonian Boundary Deposits in the Gafsa Area (Central Tunisia)
Authors T. Zouaghi, H. Abdallah and M. BédirP11 SEQUENCE STRATIGRAPHY HALOKINESIS AND PALEOGEOGRAPHIC EVOLUTION AT THE CENOMANIAN-TURONIAN BOUNDARY DEPOSITS IN THE GAFSA AREA (CENTRAL TUNISIA) 1 T. ZOUAGHI¹ ² ٭ H. ABDALLAH¹ and M. BÉDIR¹ ² ¹ Laboratoire de Géoressources I. N. R. S. T BP 95 2050 Hammam-Lif Tunisia ² Département des Sciences de la Terre Faculté des Sciences Université Tunis El Manar 1060 Tunis Tunisia Abstract The sequence stratigraphy analysis based on the two dimensional seismic data and the outcrop sedimentary studies in the Gafsa area (Central Tunisia) allows to identify two second second-order sequences. The type-2 Upper Cenomanian-Lower Turonian sequence starts by the shelf
-
-
-
Reservoir Geometry Characterisation Using Post Stack Seismic Inversion – Illizi Basin
Authors D. Medjaoud and N. DoussasP12 RESERVOIR GEOMETRY CHARACTERISATION USING POST STACK SEISMIC INVERSION ILLIZI BASIN ALGERIA Abstract 1 D. MEDJAOUD and N. DOUSSAS The Exploration Division Sonatrach Boumerdes 35000 Algeria In the Illizi basin the Cambro-Ordovician play is considered to be one of the important exploration objective not only by the proved reserves but also by prospective trap to be discover. The important Tectonics events occurred in the basin has contributed to model the incised palaeo valley geometry by controlling the material deposition and the associated fault system so it gave different seismic reflectivity response which in some areas it difficult to analyse. One
-
-
-
Silurian and Devonian Chronostratigraphy and Sedimentology of North Africa
Authors S. Lubeseder and J. RedfernP14 SILURIAN AND DEVONIAN CHRONOSTRATIGRAPHY AND SEDIMENTOLOGY OF NORTH AFRICA Abstract 1 S. LUBESEDER and J. REDFERN North Africa Research Group School of Earth Atmospheric and Environmental Sciences University of Manchester Oxford Rd Manchester M13 9PL UK A sequence stratigraphic framework has been generated for the Silurian and Devonian of North Africa. This was initiated by detailed outcrop studies in southern Morocco (Anti-Atlas) favoured by excellent exposures continuous stratigraphic successions and a large published biostratigraphic dataset. In order to extend this into an inter-regional sequence scheme the Moroccan framework was integrated with published data across North Africa. Regional composite sections
-
-
-
AVO Case Study in the Illizi Basin – Algeria
More LessP15 ABSTRACT 1 AVO CASE STUDY IN THE ILLIZI BASIN – ALGERIA A. BELLAHCENE * * Sonatrach - Division Exploration - Boumerdes - 35000 Algeria. E-mail : [email protected] Introduction and objectives The application of amplitude variation with offset (AVO) to prestack reflection data has proved to be very useful in identifying hydrocarbons accumulations in various other basins in the world. The Illizi basin was selected for a first application of the AVO method. In this basin in the region of Hassi-Tabtab two geologically similar prospects resulted in a gas discovery and a dry hole. The object of this work is
-
-
-
Geodynamic Reconstruction of the Sahel Platform (Tunisia) – An Integrated Approach
Authors H. Boussiga, M.H. Inoubli, R. Alouani, K. Sebei and M.G. Ben JemiaP16 GEODYNAMIC RECONSTRUCTION OF THE SAHEL PLATFORM (TUNISIA) – AN INTEGRATED APPROACH 1 H. BOUSSIGA¹ M.H. INOUBLI¹ R. ALOUANI¹ K. SEBEI¹ and M.G BEN JEMIA² ¹Unité de Recherche de Géophysique Appliquée Faculté des Sciences de Tunis – 2092 Tunisia ²KUFPEC Oil Co e-mail [email protected] Introduction Several works have discussed the geology of Paleogene and Neogene series within N-S axis zone Tunisian “dorsale” and Enfidha region. They have demonstrated important lateral changes in facies and thicknesses as a response of tectonic phases occurred during the Campanian-Maastrichtian the Upper Eocene and the Upper Miocene times (Burollet 1956; Castany 1952; Turki 1985; Bédir
-
-
-
Distribution and Conservation Conditions of Hydrocarbons in Ahnet and Timimoun Basins (Algeria)
Authors I. Maarouf and R. LounissiP17 DISTRIBUTION AND CONSERVATION CONDITIONS OF HYDROCARBONSIN AHNET AND TIMIMOUN BASINS (ALGERIA) Introduction: 1 The Ahnet and Timimoun basins are located in the Central Algerian Sahara (fig.1). Petroleum exploration in this area started in the 50’s. It led to important gas fields discovery such as Krechba Teguentour Reg In Salah... The petroleum reservoirs are represented by the sandy Cambro – Ordovician Lower Devonian and Strunian – Tournaisian sediments. This study aims to document the distribution and conservation conditions of hydrocarbons. Cambro-Ordovician Reservoirs: Fig.1: Location map of Ahnet and Timimoun basins I. MAAROUF ¹ and R. LOUNISSI² ¹SONATRACH Exploration Boumérdès Avenue
-
-
-
Complete Mechanical Description of Anisotropic Sedimentary Rocks – Experiments Versus Theory
Authors L. Azoune and P.N.J. RasolofosaonP18 COMPLETE MECHANICAL DESCRIPTION OF ANISOTROPIC SEDIMENTARY ROCKS – EXPERIMENTS VERSUS THEORY Summary 1 Many experimental results show that rocks are anisotropic with respect to elastic properties in other words elastic properties depends on the direction of the measurement. The rocks can also exhibit a strong non-linear elastic answer with hysteresis which appears in various ways (non-linear stress-strain loops and the deformation of the peaks of resonances in a test of bar of resonance…). In this this paper we make a test of a model that synthesizes these two behaviours. The agreement between the theoretical predictions and the experimental data
-
-
-
Gas Detection by AVO and Seismic Attributes Allal High – Algeria
Authors M. Hassaim and A. BellahceneP19 1 GAS DETECTION BY AVO AND SEISMIC ATTRIBUTES ALLAL HIGH - ALGERIA M. HASSAIM* A. BELLAHCENE * * SONATRACH - Division Exploration - Boumerdes - 35000 Algérie Abstract This poster shows the results obtained by an AVO analysis and a seismic attributes study on two seismic lines A1 and B1 located in the Allal high in central part of the Algerian Saharan platform (see figure below). Issues and objectives In the studied area three wells are located over the same structure where the principal objective for these wells is the Strunian (Upper Devonian). The first well well A was
-
-
-
Rheological Behaviour of New Polymers Used in Water Based Drilling Muds and Peformances
Authors N. Kherfellah, K. Bekkour and S. BenhadidP20 RHEOLOGICAL BEHAVIOUR OF NEW POLYMERS USED IN WATER BASED DRILLING MUDS AND PEFORMANCES 1 A laboratory study has been undertaken to elucidate the influence of structural parameters of polymer/electrolyte systems commonly used for the formulation of water-based drilling fluids on their performances as filtrate reducers or viscosifiers.High temperatures and salt conditions encountered in the well may modify the rheological properties and this makes the use of polymers necessary. High molecular weight polymers (XC gums polyacrylamides have been used in the formulation of waterbased drilling fluids for reducing filtration facilitating clay stabilisation improving débris suspension capacity and drillstring lubrication in
-
-
-
Near Surface Model for Regional Lines
Authors M. Al-Homaili, R. Bridle, R. Ley and J. McNeelyP21 NEAR SURFACE MODEL FOR REGIONAL LINES Abstract 1 This paper describes a case study of the evolution of the near surface model for an area in Saudi Arabia. Previous to the current acquisition program there have been many vintages of 2D seismic with datum correction statics being derived from many methods. Hence there has been considerable difficulty associated with the ties to the archived seismic data. This evolved method is consistent with our approach to tie all seismic data to a single datum with the best possible time image. Introduction The topography of the study area is varied exhibiting
-
-
-
Dimeta West Gas Reservoir Communication Study Using Interference Tests Results
More LessP22 DIMETA WEST GAS RESERVOIR COMMUNICATION STUDY USING INTERFERENCE TESTS RESULTS 1 ABSTRACT Interference testing is a pressure transient measurement technique used to study the interaction between wells in a reservoir and to measure reservoir parameters and understanding vertical flow behaviour and the directional flow properties. This parameters are essential for proper reservoir management particularly for completion decision . This paper discusses the analyses of transient pressure data that has been measured during multi well interference tests performed in wells producing gas of the Devonian formation F6 (unite B and A) in Dimeta west gas filed located in the north-eastern
-
-
-
The Structural Evolution of the Hodna Basin and Its Impact on the Hydrocarbon Distribution, Algeria
Authors H.L. Kheidri and K. HamoudiP23 THE STRUCTURAL EVOLUTION OF THE HODNA BASIN AND ITS IMPACT ON THE HYDROCARBON DISTRIBUTION ALGERIA 1 H.L. KHEIDRI and K. HAMOUDI Sonatrach AMT/EXP. Algeria Introduction The Hodna basin belongs to the Maghrebides outer zones the southern section of the Alpine foldbelt.It is located across the tellian nappes in the north and foreland hodnean type in the south. This latter disappears northward under the tellian nappes (Fig 1). The Oued Gueterini field (Sidi Aïssa area) constitutes the first discovered oil field in Algeria producing from the tellian nappes. The Eocene limestones in the tellian nappes constitute the main reservoirs levels
-
-
-
The Medjerda Valley (N. Tunisia) Triassic Complex – Updated Biostratigraphy and Geodynamics Revisited
Authors M.M. Ben Slama, A. Masrouhi, M. Ghanmi, M. Ben Youssef and F. Zargouni1 P24 The Medjerda Valley (N. Tunisia) Triassic complex: updated biostratigraphy and Geodynamics revisited BEN SLAMA Mohamed Montassar 1 MASROUHI Amara 1 GHANMI Mohamed 1 BEN YOUSSEF Mohamed 2 & ZARGOUNI Fouad 1 1 Département de géologie Faculté des Sciences de Tunis 1060 El Manar II Tunis Tunisie 2 INRST Hammam Lif Tunisie Key word: Medjerda valley north Tunisia Triassic Albian composite salt glacier The two studied outcrops of the Triassic deposits are located about 2 Km eastward the Slouguia village where are separated by the main road GP leading to Testour (NW Tunisia)(Fig1). They were first investigated by Solignac
-
-
-
Hydrocarbon Potential of the Sedimentary Border of the Eglabs, Southern Part of Reggane Basin, Algeria
By M. DaoudiP25 HYDROCARBON POTENTIAL OF THE SEDIMENTARY BORDER OF THE EGLABS SOUTHERN PART OF REGGANE BASIN ALGERIA Abstract 1 The research for new hydrocarbon fields within the present hydrocarbon context is oriented toward areas which haven’t been explored so far or with unidentified hydrocarbon potential. That is the case of the sedimentary part of the “Eglab” range. This part of the “Eglab range” is located half in Mauritania (Yetti and Iguidi pro part) and half in Algeria (Yetti Iguidi pro part and Eglab) (fig.1). Infracambrian sequence (Menchikoff N. ) is not well understood even if there existence and hydrocarbon maturity have
-
-
-
Unconventional Shale Gas Exploration – An Economic Resource for Natural Gas Production
By D.M. JarvieP26 UNCONVENTIONAL SHALE GAS EXPLORATION – AN ECONOMIC RESOURCE FOR NATURAL GAS PRODUCTION Unconventional gas resources are an underutilized strategic resource for countries and exploration companies alike. These producible hydrocarbon resources are often ignored except for their hydrocarbon source potential for conventional reservoirs. Unconventional shale gas is one such resource. Intervals through sili-clastic source rocks often have demonstrable amounts of “shale gas” and this is indeed an indication of the possibility of production from these shales. 1 These resources are classified as unconventional based on their very low permeability (<1 mD) the absence of conventional traps their continuous nature and
-
-
-
Interpretation of Aeromagnetic Data of South Siwa Area, North Western Desert, Egypt
Authors A. El Khafeef and M.H. SaadP27 INTERPRETATION OF AEROMAGNETIC DATA OF SOUTH SIWA AREA NORTH WESTERN DESERT EGYPT 1 M.H. SAAD and A. A. EL.KHAFEEF Exploration Dep.Egyptian Petroleum Research Institute Nasr City 11727 Cairo Egypt ABSTRACT The main target of this work is essentially concerned with the interpretation of aeromagnetic data for delineating the regional structural configuration and tectonic setting of the buried basement rocks and the overlying sedimentary cover of south Siwa area. A reduced to the pole magnetic map (RTP) was calculated from the total intensity aeromagnetic map. Regional-residual separation was applied on the RTP map using the Fast Fourier Transform (F.F.T) and
-
-
-
Wavelet Instability – Issues and Risk Management
Authors C. Tsingas, B. Link and S. TrickettP28 WAVELET INSTABILITY – ISSUES AND RISK MANAGEMENT Abstract 1 C. TSINGAS* B. LINK and S. TRICKETT Kelman Technologies Int. 35 Bowes Rd Walton On Thames Surrey UK KT12 3HU. The prevention recognition and correction of lateral wavelet instability is critical to exploration success in stratigraphic plays. A comprehensive series of processing procedures and quality control displays can provide improved risk management and error analysis of this problem. We design our processing flow such that on a routine and consistent basis procedures for the prevention of lateral wavelet instability and its effects are incorporated and analyzed. First we recognize that
-
-
-
Acquisition and Processing Challenges in Continuous Active Reservoir Monitoring
Authors T. Bianchi, J. Meunier, P. Lanfranchi, F. Huguet and J. BruneauP29 ACQUISITION AND PROCESSING CHALLENGES IN CONTINUOUS ACTIVE RESERVOIR MONITORING Summary A permanent system of reservoir monitoring has been installed on a gas storage field belonging to Gaz de France in the west of Paris. Because of the nature of the reservoir and the small saturation changes the expected 4D seismic signal is extremely low. A new processing method taking advantage of the high temporal data redundancy is presented. Introduction Gaz de France has acquired unique expertise in storing gas in aquifer reservoirs to buffer supply to meet domestic demand. Bubble expansion field pressure and gas saturation must be monitored
-
-
-
2D Seismic Interpretation and Hydrocarbon Potential of Concession NC7A Ghadames Basin, NW Libya
Authors M.A. Abdullah and A. KojaP30 2D SEISMIC INTERPRETATION AND HYDROCARBON POTENTIAL OF CONCESSION NC7A GHADAMES BASIN NW LIBYA 1 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 seismic data to identify and trace any possible stratigraphic features that may
-
-
-
Tliouanet Basin Under Basin of Intramontane Basin
By I. DibP31 TLIOUANET BASIN UNDER BASIN OF INTRAMONTANE BASIN 1 Summary- Under Tliouanet basin forms part of under basins filled with sediments Cenozoic post-foldbelt and separated by the mountainous buildings from Western Tell. It under basin is the product of a halocinetic activity; it is the diapir of Kt Bernous post lower Miocene which seems to have controlled sedimentation. The oil objective belongs to upper Miocene post-foldbelt the deposits are continental to tidal with values of porosity of about 20 % and this reservoir produced 30. 000 tons of oil. In other intramontane basins the important discovered ones were carried out
-
-
-
Reservoir Quality Modelling in Cambro-Ordovician Sands of the Tiguentourine Field, Illizi Basin, Algeria
Authors A. Hutchison, S. Haddad and C. SmalleyP32 RESERVOIR QUALITY MODELLING IN CAMBRO-ORDOVICIAN SANDS OF THE TIGUENTOURINE GAS FIELD ILLIZI BASIN ALGERIA 1 S. HADDAD¹ C. SMALLEY² and A. HUTCHISON² ¹Department Of Earth And Ocean Sciences University of Liverpool Jane Herdman Laboratories 4 Brownlow Street Liverpool L69 3GP ²BP Exploration Chertsey Road Sunbury on Thames Middlesex TW16 7LN. Summary. Reservoir quality prediction is important for the Tiguentourine Field because the permeability is very variable resulting in variable well production rates. Future development wells would benefit from being located in low-risk areas for reservoir quality if these can be predicted. Reservoir quality distribution shows some empirical trends that
-
-
-
NJORD, Multi Azimuth, Multi Vintage Pre-Stack Depth Migration for Improved Image of Structure and Reservoir – A Case History from Offshore Norway
Authors R. Oezsen, J. McArdle, A. Litvin, E. Sundvor and R. HaugenP33 NJORD MULTI AZIMUTH MULTI VINTAGE STACK DEPTH MIGRATION FOR IMPROVED IMAGE OF STRUCTURE AND RESERVOIR – A CASE HISTORY FROM OFFSHORE NORWAY Summary 1 A multi azimuth and multi vintage pre-stack depth migration (PreSDM) study conducted in the NJORD field offshore Norway significantly improved the image quality in the area of the reservoir over the existing post- and pre-stack time and depth migrations. In this case history we present: ● A description of the existing data sets with different azimuths and vintages in the project area and simulation of a full (multi azimuth) seismic data volume combining limited azimuth
-
-
-
High Resolution 3D Seismic As a Guide to Improve the Geological Model, TFT-West Field, Ilizi Basin, Algeria
Authors J. Perrot, L. Maurel, J.L. Piazza, C. Gómez, E. Figari and A.M. MessaoudP34 HIGH RESOLUTION 3D SEISMIC AS A GUIDE TO IMPROVE THE GEOLOGICAL MODEL TFT-WEST FIELD ILIZI BASIN ALGERIA Abstract Summary 1 The giant Tin Fouyé Tabankort (TFT) Field is located in the South Ilizi Basin in Algeria about 1000 km South of Algiers. The main objective is the Ordovician tight sands reservoir (infill of paleo-valleys by glacial deposits) sealed by the Silurian shales which produce oil and wet gas. The TFT gas cap was discovered in 1961. Its size is of about 300 GSm3. Its production operated by the Groupement Tin Fouyé Tabankort (GTFT) started in 1999. The current production
-
-
-
Analysis of Fracturing by Using Grid Based Attributes & Variance Cube
More LessP35 ANALYSIS OF FRACTURING BY USING GRID BASED ATTRIBUTES & VARIANCE CUBE In 2003 a high-resolution 3D survey (400 Km2) was acquired in order to improve the productivity of the TinFouyé Tabankort (TFT) gas-cap field in the Illizi Basin. 1 C. GÓMEZ J. VARELA E. FIGARI J. PERROT G. CHA and D. YAHIAOUI Repsol-Ypf Total Sonatrach TinFouye Tabankort anticline is a structurally complex region composed of several NW-SE & NE-SW structural trends related to regional sub-meridian reverse-strike slip faults. The tectonic history of the region can be summarized in four main stages. After the Pan- African collision and suturing phase
-
-
-
Gravity Compilation of Libya Project – Stages of Assembly, Interpretation and Project Evaluation
Authors A. Saheel and A. SuleimanP36 GRAVITY COMPILATION OF LIBYA PROJECT – STAGES OF ASSEMBLY INTERPRETATION AND PROJECT EVALUATION 1 Abstract A. SAHEEL and A. SULEIMAN Petroleum Research Center Tripoli- Libya [email protected] [email protected] The gravity compilation of Libya project started back ten years ago by data collection and integration stage. A second stage of the project comprises an additional data and produced a coherent and leveled data set of Bouguer gravity onshore with free air gravity offshore. The data set used throughout the project consisted basically of three types: data already converted to Geodetic Reference System of 1980 (GRS80) from the International Gravity Formula of
-