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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 - 20 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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