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1st EAGE North African/Mediterranean Petroleum & Geosciences Conference & Exhibition
- Conference date: 06 Oct 2003 - 09 Oct 2003
- Location: Tunis, Tunisia
- Published: 06 October 2003
121 - 140 of 162 results
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Multiple Attenuation Strategy on Depth-Varying Shallow Water Data from the Middle East
Authors R. Ala‘i and D.J. VerschuurT014 MULTIPLE ATTENUATION STRATEGY ON DEPTH-VARYING SHALLOW WATER DATA FROM THE MIDDLE EAST R. ALÁ’I 1 and D.J. VERSCHUUR 2 Abstract In this paper a successful application of multiple attenuation is being discussed and illustrated on marine data that was recorded in the Middle East. The data is characterized by a varying depth of the seabottom in an extreme shallow water depth environment with numerous buried reefs and is therefore contaminated with numerous types of very high amplitude multiples related to different boundaries inside the earth’s surface. The strategy comprises the application of simultaneous multi-gate predictive deconvolution in the prestack
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Microseismic Monitoring of Hydrocarbon Reservoirs
More LessT015 MICROSEISMIC MONITORING OF HYDROCARBON RESERVOIRS An Introduction To Microseismic Monitoring 1 This paper demonstrates how microseismic activity in the reservoir can be used for continuous 3D time-lapse monitoring of hydro and geo-mechanical processes occurring in the interwell region and assist in the reservoir management process. Microseismic activity has been successfully detected and located in rocks ranging from unconsolidated sands to chalks and crystalline rocks. Microseismicity can be used to: � Provide real-time 3D monitoring of fluid pressure front movement such as water flood fronts and hydrofrac operations � Identify hydraulically conductive fault structures affecting reservoir compartmentalisation or acting as
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Permanent Downhole Seismic Sensors in Flowing Wells
More LessT016 PERMANENT DOWNHOLE SEISMIC SENSORS IN FLOWING WELLS Introduction 1 It is generally accepted that the ‘Oilfield of the Future’ will incorporate distributed permanent downhole seismic sensors in flowing wells. However the effectiveness of these sensors will be limited by the extent to which seismic signals can be discriminated or de-coupled from flow induced acoustic noise originating within the production tubing A specialised test facility has been developed in order to understand and characterise the acoustic noise generated by fluid flow within a production borehole with the goal of developing the next generation of seismic tools suitable for permanent deployment
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Integrated Crosswell Seismic – Advanced Technology to Improve Reservoir Description in El Borma Field, Tunisia
Authors M. Antonelli, F. Ghadhab, F. Melchiori, F. Miranda and N. SabriT017 INTEGRATED CROSSWELL SEISMIC – ADVANCED TECHNOLOGY TO IMPROVE RESERVOIR DESCRIPTION IN EL BORMA FIELD (TUNISIA) SUMMARY 1 This paper describes the results achieved applying the Integrated Crosswell Seismic (ICS) an innovative technology to improve the description of the internal geometries of the reservoir in El Borma Field (Tunisia) The results obtained have been used to describe in detail the complex internal geometries of the reservoirs to improve the geological model and to plan of new producer well with more confidence. INTRODUCTION Fig. 1 El Borma Field location extended to all reservoir levels. Infilling wells have been drilled since the
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Reservoir Characterization of TAGI Sands from Seismic Data, Bazma and Jorf Permits, Central Tunisia
By D. NelsonT018 RESERVOIR CHARACTERIZATION OF TAGI SANDS FROM SEISMIC DATA BAZMA AND JORF PERMITS CENTRAL TUNISIA 1 The objective of this study is to identify hydrocarbons in the Triassic Argillo-Greseaux Inferiér (TAGI) reservoir interval. An initial phase of analysis built a model of seismic reflectivity anchored with well log data. Amplitude versus offset (AVO) attributes are found to be useless for direct hydrocarbon indication. A second phase of study examines porosity in TAGI sands based on acoustic impedance inversion (AI) techniques. We demonstrated that lateral variations in TAGI reservoir quality can be interpreted using AI inversion techniques and infer variability of
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Seismic Modelling of Tannezuft "Hot Shale" Thickness Variation, Murzuq Basin, Libya
Authors R. Lemaire and D. WloszczowskiT019 Seismic modelling of Tannezuft “Hot Shale” thickness variation (Murzuq Basin Libya) Introduction The Lower Silurian Tannezuft “Hot Shale” is the proven source rock in the Murzuq basin. The distribution of these shales in the basin is a difficult problem for explorationists as it is not believed that long-range migration has been part of the petroleum system. The Hot shales are not present all over the Murzuq area and although a clear NW-SE trend is seen on maps based on well data the limit of the extension is not clear. Therefore it is important to calibrate the synthetic response of
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Modeling First Arrivals in Heterogeneous Velocity Grids for Traveltime Tomography
By B. AbbadT020 MODELING FIRST ARRIVALS IN HETEROGENEOUS VELOCITY GRIDS FOR TRAVELTIME TOMOGRAPHY Abstract 1 First-arrival traveltimes can provide a valuable information about subsurface velocity structure. Seismic measurements carried out between boreholes allow reconstructing velocity models of the medium between them using tomographic inversion algorithms. The technique uses first-arrival traveltimes to retrieve velocity images by resolving a system of algebric equations. The aim of this paper is to present an efficient algorithm that predicts first arrivals of seismic waves in heterogeneous velocity media for arbitrary locations of sources and receivers. Introduction Traveltime tomography uses picked fastest arrivals to deduce velocity variations in
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Geostatistics on Seismic to Improve the Elastic Impedance Attributes
More LessT021 GEOSTATISTICS ON SEISMIC TO IMPROVE THE ELASTIC IMPEDANCE ATTRIBUTES Abstract 1 It is common sense to say that the reliability of any seismic attribute is highly dependent on the quality of the data from which it is derived. It is particularly true in the case of AVO or AVA analyses where the presence of seismic artifacts such as the acquisition imprint can have a major impact. In this paper we present a methodology to attenuate these artifacts in the seismic data in order to optimize the elastic impedance attributes computation. Using a geostatistical technique we introduce the concept of
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Data Storage Challenges – A Case Study in Egypt of Large Seismic Volumes
By J.B. KozmanT022 DATA STORAGE CHALLENGES – A CASE STUDY IN EGYPT OF LARGE SEISMIC VOLUMES Summary 1 Exponential growth of seismic datasets in petroleum exploration and production creates a challenge for traditional data storage systems and an opportunity for innovative solutions. At German Oil & Gas Egypt (GEOGE) expanded exploration activities over the past three years resulted in rapidly increasing amounts of 3D seismic data. In-house processed seismic attribute volumes also added to this growth. Schlumberger Information Solutions (SIS) implemented a hierarchical content management solution to minimize the total cost of ownership for GEOGE’s seismic application projects. Introduction JESS B. KOZMAN
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Seisbit® Seismic-while-Drilling Technique – Summary of Results Obtained in Onshore Surveys
Authors L. Petronio, F. Miranda, F. Poletto and R. MiandroT023 SEISBIT® SEISMIC-WHILE-DRILLING TECHNIQUE – SUMMARY OF RESULTS OBTAINED IN ONSHORE SURVEYS PETRONIO L. 1 MIRANDA F. 2 POLETTO F. 1 AND MIANDRO R. 2 Abstract 1 1 OGS Department of Geophysics of the Lithosphere Borgo Grotta Gigante 42/C 34010 - Sgonico (Trieste) Italy 2 ENI E&P - Italy Seisbit® is a seismic-while-drilling (SWD) technology developed by OGS and ENI E&P. SWD method utilizes the noise produced by drill-bit to obtain interpretable borehole seismic data. Several 2D Seisbit® acquisitions were performed in Southern Italy to monitor exploration wells located in a complex thrust zone. Recently two 3D SWD surveys were
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Examining Azimuthal Analysis Technology – A Case History of 3D Seismic in Egypt
Authors N.E. Birkett and D.J. MonkT024 EXAMINING AZIMUTHAL ANALYSIS TECHNOLOGY – A CASE HISTORY OF 3D SEISMIC IN EGYPT Abstract 1 Apache has recently completed processing of a large (over 2 500 sq km) 3D seismic survey in the Khalda area of Egypt. A significant portion of the survey was acquired in such a way that the data lend themselves to analysis based on azimuth. The broad azimuth distribution and high fold of the data led to an excellent final result through conventional processing. While not specifically in a geologic area where azimuthal variations have been noted previously the acquisition of the data in this
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Integrated Crosswell Seismic – Advanced Technology to Improve Reservoir Description in Belayim Land Field, Egypt
Authors M. Antonelli, R. Awad, A. Khedr and F. MirandaT025 INTEGRATED CROSSWELL SEISMIC – ADVANCED TECHNOLOGY TO IMPROVE RESERVOIR DESCRIPTION IN BELAYIM LAND FIELD (EGYPT) SUMMARY 1 This paper describes the results achieved applying the Integrated Crosswell Seismic (ICS) technology in Belayim Field (Egypt). ICS is an innovative methodology to improve the description of the internal geometries of the reservoir. The results achieved have been used to describe in detail the complex internal geometries of the reservoirs to improve the geological model and to plan of new injector or producer wells. INTRODUCTION Belayim Land field one of the oldest oil field in Egypt is located in the central part
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Pseudo Gamma Ray Inversion Using Artificial Neural Networks from Seismic Survey
Authors N. Keskes and F. MansanneT026 PSEUDO GAMMA RAY INVERSION USING ARTIFICIAL NEURAL NETWORKS FROM SEISMIC SURVEY 1 N.KESKES and F.MANSANNE TOTALFINALELF Scientific and Technical Center PAU France Abstract : Recent research and investigations in reservoir parameter characterization based on seismic data have started to show encouraging progress ([2] [3]). Gamma Ray (GR) Logs provide essential information on petrophysical properties measured along a given well bore that can be used to appreciate various fluid effects and localize top and base reservoir sequences. Since this information is available only for wells so it would be interesting to avail of this information beyond wells. When seismic is
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Bank-Basin Model for the Paleogene of NE Libya
Authors H.O. Elwerfalli and D.A.V. StowT027 BANK-BASIN MODEL FOR THE PALEOGENE OF NE LIBYA Abstract 1 Detailed sedimentological studies of the Paleogene section from both the subsurface (14 boreholes) and surface outcrops (5 localities) have shown that the western margin of the Cyrenaica Platform was rimmed by a shallow-water carbonate bank. Characteristic features of bank facies include an abundant shallow marine fauna (nummulites algae mollusks miliolids echinoderms) and dominant packstone to grainstone textures interbedded with minor bioclastic wackestones. These data together with evidence from red algae and microborings suggest deposition in the lower aphotic zone above storm wave base. The fore-bank region is characterized by
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Can We Change the Basin Modeling Working Scale in with High Speed Algorithms?
Authors M. Thibaut and C. PrijacT028 CAN WE CHANGE THE BASIN MODELING WORKING SCALE IN WITH HIGH SPEED ALGORITHMS? Introduction 1 The ability to predict the entire process from source rock burial to hydrocarbon generation and expulsion and to quantify hydrocarbon accumulation through oil and gas migration has a direct impact on the strategy for optimizing exploration. For this purpose step-by-step approaches are often adopted. They range from simple maturity assessment based on multi1D calculation to advanced quantitative volumetric estimation based on fully coupled 3D calculation. The latter is the most rigorous and reliable solution which drawback used to be simulation duration incompatible with operational
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Hydrocarbon Generation and Expulsion Histories in Central Eastern Onshore Tunisia
Authors L. Fourati, K. Ben Boubaker and M. SaidiT029 HYDROCARBON GENERATION AND EXPULSION HISTORIES IN CENTRAL EASTERN ONSHORE TUNISIA I- GEOLOGICAL SETTING 1 The study area represents the central east-central onshore portion of Tunisia. It shows a scarce gentle outcropping structures separated by wide flat plains. This eastern region was a stable platform during the Mesozoic and Paleogene times shallow marine carbonates dominated to the south grading to open marine shaly facies to the North. During Neogene time an inversion occurred with active subsidence in most of the area. This subsidence is probably related to the active presence of the high zone (N-S Axis) to the west and
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Geochemical Correlation of the Cenomanian/Turonian Source Rock Sequences in the Mediterranean, North Africa – Adriatic/Dinaric Area
More LessT030 GEOCHEMICAL CORRELATION OF THE CENOMANIAN / TURONIAN SOURCE ROCK SEQUENCES IN THE MEDITERRANEAN NORTH AFRICA - ADRIATIC/DINARIC AREA Abstract 1 Geochemical research of the Cenomanian/Turonian strata in the North Africa and Adriatic/Dinaric area indicates the presence of good source rock sequences with high generative potential. Organic rich strata in the northwestern Africa developed by upwelling systems however this phenomena gradually decreased along the African coast and completely disappeared in the eastern Mediterranean. In the Adriatic/Dinaric and other areas development of good source rocks was controlled by formation of oxygen minimum zone. In the areas with strong influence of upwelling
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Compositional Grading in the Oil Column – Advances from a Mass Balance and Quantitative Molecular Analysis
Authors F. Mosca, D.A. Wavrek and D.M. JarvieT031 COMPOSITIONAL GRADING IN THE OIL COLUMN – ADVANCES FROM A MASS BALANCE AND QUANTITATIVE MOLECULAR ANALYSIS 1 Compositional grading in oil columns has been known for fifty years but the topic received little attention until the 1980’s when sufficient analytical technologies became available to probe the phenomenon. Compositional grading is most commonly associated with thick oil columns and is promoted by a reduction in pressure and temperature as well as by the introduction of volatiles. Oil properties that increase with depth include the C7+ mole fraction and dewpoint whereas a decrease with depth is noted for the C1 mole
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Off-Shore Mediterranean Sea Oil Potential, Egypt
More LessT032 OFF-SHORE MEDITERRANEAN SEA OIL POTENTIAL EGYPT Abstract 1 H. OSMAN and M. NEYAZY Petroleum Research Center Tripoli- Libya The off-shore Mediterranean area is the most active exploration province in Egypt and predominantly considered as a gas province. Undeveloped oil and condensate were found in a number of wells (e.g. Mango-1 Tineh West Abu Qir Marakia-1 and El King). The majority of the developed gas discoveries are from the Pliocene reservoirs and the rest are from the Miocene. The undeveloped oil and condensate discoveries which were found in some wells are from older ( Miocene and Pre-Miocene) and deeper reservoirs
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Mesozoic and Cenozoic Petroleum Systems in Tunisia
Authors M.H. Acheche, R. Ghénima, M. Saidi and H. Ben KilaniT033 MESOZOIC AND CENOZOIC PETROLEUM SYSTEMS IN TUNISIA 1 M.HEDI ACHECHE; RAMZI GHÉNIMA; MONCEF SAIDI and HATEM BEN KILANI ETAP 27 bis Avenue Kheireddine Pacha BP 367 1002 Tunis Tunisia INTRODUCTION Further to the first discovery made in the Cap Bon Area in northeastern Tunisia in 1948 around 420 exploration-appraisal wells have been drilled to test Mesozoic and Cenozoic basins in Tunisia with the discovery of 2500 Millions barrels of oil equivalent (BOE) over 50 pools 20 of which are producing fields at end 2002. These reserves are spread over a wide range of reservoir levels predominantly carbonate and play
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