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65th EAGE Conference & Exhibition
- Conference date: 02 Jun 2003 - 05 Jun 2003
- Location: Stavanger, Norway
- Published: 02 June 2003
21 - 40 of 487 results
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Oil Field Water Injection – a Large-Scale Water-Rock Experiment – Results and Applications
Authors H. Johansen, B.V. Nystrand, H. Stray, I. Johansen and Ø. DugstadA-21 OIL FIELD WATER INJECTION – A LARGE SCALE WATER-ROCK EXPERIMENT – RESULTS AND APPLICATIONS Summary 1 H. JOHANSEN 1 B.V. NYSTRAND 2 H. STRAY 1 I. JOHANSEN 1 and Ø. DUGSTAD 1 1 Institute for Energy Technology P.O.Box 40 2027 Kjeller Norway EAGE 65th Conference & Exhibition — Stavanger Norway 2 - 5 June 2003 2 A/S Norske Shell Water-rock interaction during sea water injection in the Norne Field Norwegian Sea has been investigated by natural chemical and isotopic tracers. A procedure to identify good breakthrough monitors has been developed. The nature of mineral reactions in the reservoir during
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4D Seismic Response of Primary Production and Waste Injection at the Valhall Field
Authors O. Barkved, K. Buer, K.B. Halleland, R. Kjelstadli, T. Kleppan and T. KristiansenA-22 4D SEISMIC RESPONSE OF PRIMARY PRODUCTION AND WASTE INJECTION AT THE VALHALL FIELD Introduction A new 3D seismic data set was acquired across the Valhall field during the summer of 2002. The presences of strong production induced seismic responses were expected due to the nature of the field and earlier observations. The Valhall reservoir is a highly porous chalk which compacts as the reservoir is depleted. The compaction results in a “hardening” and thickness reduction of the reservoir and subsequent subsidence of the overburden and the seafloor. The new data was processed using a “similar” processing flow as was
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Use of PP and PS Time-Lapse Stacks for Fluid-Pressure Discrimination
Authors A. Stovas, M. Landro and B. ArntsenA-23 USE OF PP AND PS TIME-LAPSE STACKS FOR FLUID-PRESSURE DISCRIMINATION Abstract 1 A complementary method to achieve quantitative information about reservoir property changes during production is to measure shift in two-way traveltime within a given reservoir section. A practical example of how this method can be used to give additional information about pressure and saturation changes in reservoir segment is given in Landrø 2001 Landrø 2002 and Landrø et al. 2003. In this paper we investigate how combined use of time-lapse PP and PS seismic data can be processed and analyzed for the discrimination between pressure and saturation changes.
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Super-Resolution Mapping of Thin Gas Pockets
Authors H.G. Borgos, T. Randen and L. SonnelandA-24 SUPER-RESOLUTION MAPPING OF THIN GAS POCKETS Summary 1 Improved resolution in seismic prospecting implies better resolving power of objects in the subsurface. It is well known that resolution is directly related to the frequency bandwidth of the seismic measurement. Various criteria for the resolving power exist like the Rayleigh criterion [1]. Under certain conditions the resolution can be improved beyond the limits of i.e. the Rayleigh criterion. These conditions can be that additional information about the scene being analyzed is available. Procedures that enable such improved resolution are referred to as super-resolution. We will present a seismic super-resolution procedure
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Modeling of Fluid Effects in Compartmentalized Areas, an Oseberg South Case Study
Authors S.A. Petersen, B.A. Farrelly and B.I. BraathenA-25 MODELING OF FLUID EFFECTS IN COMPARTMENTALIZED AREAS AN OSEBERG SOUTH CASE STUDY 1 S.A. PETERSEN B.A. FARRELLY and B.I. BRAATHEN Norsk Hydro E&P PO Box 7190 N-5020 Bergen Norway Summary In order to evaluate the seismic (or any other physical) response of the subsurface one should be able to combine a model of the matrix with a model of the pore fluid distribution. The task becomes more especially difficult when the matrix distribution reflects a compartmentalization of the subsurface and/or if more fluid regimes are present. A method to construct such several models is presented and applied in a
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Absolute and Relative Gravity Integration for High Precision 4D Reservoir Monitoring
Authors J.M. Brown, T. Chen, T.M. Niebauer, F.J. Klopping, J. Ferguson and J. BradyA-26 ABSOLUTE AND RELATIVE GRAVITY DATA INTEGRATION FOR HIGH PRECISION 4D RESERVOIR MONITORING 1 Based on an estimate 3µGals per 1cm. EAGE 65th Conference & Exhibition — Stavanger Norway 2 - 5 June 2003 1 Abstract In October 2002 BP Exploration Alaska (BPXA) the primary operator of the Prudhoe Bay Oil Field began a large-scale water injection program to counter decreasing pressure on the Prudhoe Bay gas cap. To monitor the progress of the injection program surface gravity measurements will be taken once per year. Reservoir models require total measurement uncertainty to be better than ±10µGals a challenging specification to
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Azimuth Preserved Trace Binning of 4D Seismic Data for Improved Repeatability
Authors X.-P. Li, J. Brittan, S. Harwood and M. WidmaierA-27 AZIMUTH PRESERVED TRACE BINNING OF 4D SEISMIC DATA FOR IMPROVED REPEATABILITY Abstract 1 During the processing of 4D seismic data it is vital to adequately compensate for the nonrepeatability that is a function of acquisition and processing effects. In this paper it is demonstrated that the seismic repeatability can be improved if an azimuth preserved trace binning methodology is implemented between base and monitor survey during the preprocessing stage. This improvement is illustrated using synthetic seismic data generated utilising real navigation data and a model of an isotropic medium. Different types of azimuth based trace binning can be done
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Feasibility of Inverting 3-D FTG Data for Reservoir Monitoring
Authors A. Druzhinin, A. Vasilevsky, J.R. Evans, C.A. Murphy and X-Y. LiA-28 FEASIBILITY OF INVERTING 3-D FTG DATA FOR RESERVOIR MONITORING 1 Abstract Three-Dimensional Full Tensor Gradiometry (3-D FTG) acquisition system takes ultra sensitive realtime measurements of small gravity changes (gradients) caused by density differences in all directions. We have undertaken a numerical examination of the feasibility of using this system for reservoir monitoring. Special gravity modeling and inversion algorithms that can describe and predict the dynamic behavior of a hydrocarbon reservoir have been developed and tested on synthetic FTG data based on realistic 4-D petrophysical models. Our inversion yields estimates of uncertainty in hydrocarbon production data. Results show that the
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New Approach for 4D Processing with OBC Data and Marine Streamer Data
Authors D. Lecerf and T. WeisserA-29 NEW APPROACH FOR 4D PROCESSING WITH OBC DATA AND MARINE STREAMER DATA Abstract 1 The repeatability of marine streamer data and OBC data is generally rather poor because they are acquired in completely different conditions. So can we successfully combine both types of acquisition in order to detect a weak 4D signal? To examine this we introduce the concept of a common seismic cube and partial differences. The common seismic cube represents the invariant geology and is computed with a geostatistical method taking advantage of the redundancy of the seismic data. It shows a better signal to noise ratio
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Seismic Monitoring of the Heidrun, Norne and Midgard Fields Using Steerable Streamers
Authors O. Eiken, H. Aronsen, A.-K. Furre, L. Klefstad, L.H. Nordby, B. Osdal and M. SkaarA-30 SEISMIC MONITORING OF THE HEIDRUN NORNE AND MIDGARD FIELDS USING STEERABLE STREAMERS Abstract 1 Seismic reservoir monitoring has considerable unrealised potential if higher repeatability can be obtained. Today’s towed streamer systems impose basic limitations on repeatability as streamer feather is difficult to repeat. Horizontally steerable streamers can potentially make repeated streamer positions possible. During the 2001 summer season time-lapse data were acquired over three producing fields in the Norwegian Sea using the new technology. We show in this paper some results of these surveys. Introduction Several 4D success stories have been reported but there are also a number of
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Detection of Saturation Changes in a Turbidite Sand by 4D AVOA
Authors A. Shams and C. MacBethA-31 DETECTION OF SATURATION CHANGES IN A TURBIDITE SAND BY 4D AVOA Summary 1 A seismic data processing methodology is developed on the basis of parallelized restricted offset and azimuth pre-stack processing (PROAP) for P-wave OBC time-lapse data. It is designed to preserve the directional signature cross-equalize datasets and generate a suitable input to a filter that separates seismic anisotropy from the static and isotropic ‘geological’ response. Application of this procedure reveals discrete time-lapse anisotropy anomalies in a turbidite sand body. These anomalies change intensity during production with their position and orientation coinciding with the highest net-to-gross sands. The anomalies
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Spectral Decomposition Provides Rapid Screening Tool for Gas Potential in the Norwegian Sea
Authors R.H. Leadholm, T.J. Austin and P.F. OstendorfA-33 SPECTRAL DECOMPOSITION PROVIDES RAPID SCREENING TOOL FOR GAS POTENTIAL IN THE NORWEGIAN SEA 1 R.H. LEADHOLM T.J. AUSTIN and P.F. OSTENDORF ConocoPhillips Norge PO Box 220 N-4098 Tananger Norway EAGE 65th Conference & Exhibition — Stavanger Norway 2 - 5 June 2003 Summary Investigation of 3D data sets over two deep water gas accumulations several dry tests and various undrilled prospects in the Vøring Basin of the Norwegian Sea shows that spectral decomposition phase and amplitude spectra can be used to define gas accumulations. This technique provides a rapid screening methodology and compliments the more traditional utilization of spectral
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Havsule – Exploration in Deep Water Offshore Norway
Authors K.J. Hansch, J.R. Berry and J.J. DoorenbosA-34 HAVSULE – EXPLORATION IN DEEP WATER OFFSHORE NORWAY 1 K.J. HANSCH J.R. BERRY and J.J. DOORENBOS BP Norge Godesetdalen 8 4065 Stavanger Norway The Havsule licence (PL254) was seen as one of the most interesting areas in the Norwegian 16 th licence round. Four licence blocks covering an area of 1800 km 2 were awarded in May 2000 to a consortium of BP Norge Norske Conoco (now ConocoPhillips) SDFI (now Petoro) and TotalFinaElf. BP was assigned operatorship. The licence is located in the Møre basin offshore Mid Norway with an average water depth of about 1500 m. In the
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Identification of Reservoir Rock with Lamé Parameters – An Atlantic Canada Case History
By R. TonnA-35 IDENTIFICATION OF RESERVOIR ROCK WITH LAMÉ PARAMETERS – AN ATLANTIC CANADA CASE HISTORY Abstract Figure 1: EnCana’s landposition in Newfoundland EAGE 65th Conference & Exhibition — Stavanger Norway 2 - 5 June 2003 1 RAINER TONN EnCana Corporation 150 9 th Avenue S.W. P.O. Box 2850 Calgary Alberta T2P 2S5 Canada Summary: Lamé parameters allow the identification of reservoir rock and fluids (Goodway et al.1999 Goodway 2001). This case study demonstrates how λρ and µρ inverted from 3D marine seismic made it possible to classify reservoir rock in an exploration prospect offshore Newfoundland Canada. The analysis of crossplots discriminates
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Challenges in Deep Offshore Imaging, West Africa
Authors C. Lafond, H. Houllevigue, Y. Kerdraon, J.F. Riou, M. Bridson and I. JonesA-36 CHALLENGES IN DEEP OFFSHORE IMAGING WEST AFRICA Abstract 1 The deep offshore of the Gulf of Guinea is a challenge to seismic processing and imaging techniques due to the complexity of the salt body structures and the omnipresence of mode conversions that mask the primary signal. Even though true (Kirchhoff) prestack time migration can recover the top of salt and wide sedimentary basins (not salt covered) it fails elsewhere. We show that wave equation 3D PreSDM is necessary to properly image target sedimentary reflectors in between and below salt domes compared to Kirchhoff 3D PSDM. However this is true
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3-D Prestack Depth Migration and Illumination Analysis - A Case Study from Offshore Norway
Authors C. Gerea, O. Riise, F. Assouline and M. RhodesA-37 3-D PRESTACK DEPTH MIGRATION AND ILLUMINATION ANALYSIS - A CASE STUDY FROM OFFSHORE NORWAY Abstract 1 We present a 3-D prestack depth migration case study from Halten area offshore Norway. Although the geological structure is not very complex we apply advanced migration algorithms to yield accurate seismic images in terms of focusing and positioning and valuable reflection-point gathers for amplitude analysis. The aim of this study is two-fold; to improve the quality of seismic image of the main fault/reservoir segments towards better positioning of production wells and to preserve amplitudes for enhanced mapping of reservoir sands. Advanced 3-D prestack
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Amplitude Brights and Hydrocarbon Occurrence in License PL128, Offshore Mid-Norway
Authors G. Richardsen, K.O. Hartvigsen, F. Karlsen, L. Michelsen, J.O. Hansen and G.R. AhmadiA-38 AMPLITUDE BRIGHTS AND HYDROCARBON OCCURRENCE IN LICENSE PL128 OFFSHORE MID-NORWAY Introduction 1 License PL128 is located on northern Dønna Terrace between the Nordland Ridge and the Træna Basin offshore mid-Norway. Eleven exploration wells have been drilled in the license between 1986 and 2002. Exploration has been successful with discovery of the Norne (1992) Svale (2000) Falk (2002) and Stær (2002) fields. Two additional exploration wells will be drilled during first half of 2003. Within the license area there is a correlation between amplitude brights on top reservoir level and oil discoveries. This relationship has to some extent been used
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Risking Sediment Acces and Charge – Structural and Basin Modelling, Norwegian North Sea
Authors E. Thompson, S. Jones, R. Satter, S. Wigger, N. McCormak and P. GriffithsA-39 RISKING SEDIMENT ACCESS AND CHARGE – STRUCTURAL AND BASIN MODELLING NORWEGIAN NORTH SEA Summary 1 A Norwegian Sea prospect was assessed for risk due to charge and reservoir presence. The prospect was identified by seismic attribute analysis and supporting evidence was sought from modelling. The impact on prospect viability of the sediment access and charge probabilities was examined. It was found that although modelling showed the sediment access to the area was possible the model did not identify known accumulations to the north and was therefore unreliable in this area. The charge modelling accurately identified known reserves to the
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The Importance of Wide Azimuth in Imaging
Authors B. Arntsen and M. ThompsonA-40 THE IMPORTANCE OF WIDE AZIMUTH IN IMAGING 1 B. ARNTSEN and M. THOMPSON Statoil Research Centre Postuttak N-7005Trondheim Norway Summary Comparing 3D depth migrated streamer data and 3D depth migrated OBC data from the same area it is demonstrated that the better quality of OBC data is related to the relatively wider azimuths used in the OBC data acquisition geometry. Introduction The benefits of wide azimuth acquisition geometries have been recognized for a long time in land seismics (Cordsen and Galbraith 2002). Offshore true 3D OBC data has recently become available and the importance of better azimuth coverage both
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Competence and Technology Needs for the E&P Business
By B. NylandB-01 COMPETENCE AND TECHNOLOGY NEEDS IN THE E & P BUSINESS 1 The paper will discuss the changes the use of technology in the E & P business has experienced during the last 10 – 15 years and the causes this has had on competence needs the interaction between different technical subjects and the changes in the working processes. The statement is that the E & P business has become a digital business and how is this being handled both in the industry but also in the academia. What has been achieved during these years and is there something that
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