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69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007
- Conference date: 11 Jun 2007 - 14 Jun 2007
- Location: London, UK
- ISBN: 978-90-73781-54-2
- Published: 11 June 2007
1 - 50 of 574 results
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Overview of the Challenges Facing Oil Industry Recruitment and Training
Authors C. Goscomb and D. MacdonaldA001 Overview of the Challenges Facing Oil Industry Recruitment and Training C. Goscomb* (Shell International BV) & D. Macdonald (University of Aberdeen) SUMMARY EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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The Experience of the Multinationals
By M. BrownNO PAPER AVAILABLE EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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Recruitment Challenges Facing SMEs
By H. AllenNO PAPER AVAILABLE EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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The Recruiters Tale
By D. O‘DonnellNO PAPER AVAILABLE EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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The Future Role of Universities
By H. JohnstonNO PAPER AVAILABLE EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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Summary of Themes – An Introduction to the Open Session
Authors D. MacDonald and G. GoscombA006 Summary of Themes – An Introduction to the Open Session D. MacDonald* (University of Aberdeen) & G. Goscomb (Shell International BV) SUMMARY EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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Arctic Oil and Gas Potential in a Global Perspective
More LessA009 Arctic Oil and Gas Potential in a Global Perspective D.L. Gautier* (USGS) SUMMARY EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 The Arctic is known to hold the world’s largest hydrocarbon province the West Siberian Basin and several other demonstrated world-class basins as well (Timan- Pechora North Slope Norwegian Sea). Other Arctic provinces also have significant potential but high costs and engineering complexity have been barriers to exploration and development. The Arctic remains largely unexplored with respect to petroleum and extreme geologic uncertainty characterizes the resource potential of the entire region. Standard tools
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Canadian Arctic - Perspectives for the Petroleum Industry
By D. EvoyA010 Canadian Arctic - Perspectives for the Petroleum Industry D. Evoy* (Petro-Canada) SUMMARY The oil and gas prospectivity of the Canadian Arctic has been demonstrated through exploration dating back to the 1960s; resources in the order of 20 Tcf of gas and 1.5 Bbbls of oil have been identified. However there has been no gas production to date and only a modest amount of oil has been produced. The Mackenzie Valley Pipeline currently under regulatory review is the proposed transportation route for development from the Mackenzie Delta / Beaufort Sea. More preliminary is the concept of LNG shipment from the
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Greenland – Petroleum Potential, Ongoing and Future Exploration
More LessA011 Greenland – Petroleum Potential Ongoing and Future Exploration F.G. Christiansen* (GEUS) SUMMARY EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 A high stable oil price political instability in many oil-producing regions in the World and relatively close distances to western markets has given a growing interest from many supermajors and majors for exploration in the Arctic and other high latitude areas including both West and East Greenland. In recent years exploration focus in Greenland has mainly been on central West Greenland with several licensing rounds but activities in the coming years are likely
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Opportunities & Challenges Working in a "Arctic" Environment, Offshore Sakhalin
More LessA012 Opportunities & Challenges Working in a "Arctic" Environment Offshore Sakhalin M. Gunningham* (Sakhalin Energy Investment Company) SUMMARY Sakhalin Energy is currently developing 3 oil and gas fields offshore Sakhalin Island off the east coast of mainland Russia. This is a challenging area for exploration and development with potentially billions of barrels of oil and gas. The key problem is that in the winter drifting sea ice several meters thick heavy snow and temperatures down to minus 40°C all contribute to Arctic type conditions. Under these conditions the offshore developments use the latest technology with concrete gravity based platforms which
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Oil and Gas Development in Norway’s Northern Areas
By O. BirkelandA013 Oil and Gas Development in Norway’s Northern Areas O. Birkeland* (Statoil ASA) SUMMARY The Northern areas include the areas west of the Lofoten Islands in the Norwegian Sea and to the northern shelf edge of the Barents Sea. Exploration was initiated in 1980 with the drilling of the first well. Close to 70 exploration wells have since been drilled in the south-western Barents Sea. Until the decision to develop the Snøhvit gas fields through an LNG plant on the Finnmark coast was made no commercial solutions were seen for the discoveries in the area. Snøhvit will come on stream
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North Caspian Sea - An Ice Design Strategy
By D. MayneA014 North Caspian Sea - An Ice Design Strategy D. Mayne* (AGIP KCO) SUMMARY This paper is focused on developing and implementing a strategy for development of the North Caspian Sea. Specific data needs are identified for Engineering Operations and other areas of the development. Costing of designs are tied back to an overall strategy to determine the motivation for design criteria refinement. Specific field data gathering activities are discussed in light of design criteria needs apparatus development data gathering and processing. Winter logistics and operational challenges are discussed. EAGE 69 th Conference & Exhibition — London UK 11 -
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Exploration of the Lower Cretaceous Sands in Leland Area, Alberta, Using Seismically Derived Rock Properties
Authors C. C. Dumitrescu and F. MayerA017 Exploration of the Lower Cretaceous Sands in Leland Area Alberta Using Seismically Derived Rock Properties C.C. Dumitrescu* (Sensor Geophysical Ltd) & F. Mayer (Devon Canada Corporation) SUMMARY This paper provides a case study of a 3D seismic survey in the Leland area of the Deep Basin of Alberta Canada where seismically derived rock properties were used for exploration. In this case study identifying the gas sands within the lower Cretaceous was the primary interpretive focus. Conventional interpretation of Lower Cretaceous sands on normal migrated seismic has typically presented a number of difficulties. First we ran AVO analysis and deterministic
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r Gas Hydrates Based on Seismic Information – With Examples from Northern Gulf of Mexico
More LessA018 Exploration for Gas Hydrates Based on Seismic Information – With Examples from Northern Gulf of Mexico J. Dai* (Schlumberger) & N. Dutta (Schlumberger) SUMMARY A five-step integrated workflow is developed to delineate shallow gas hydrates using seismic information. We applied the workflow and estimated gas hydrate saturations in two study areas in the northern deepwater Gulf of Mexico. Due to lack of hard data (well control) for the shallow seismic data our predictions used analogue models based on geologic interpretation seismic inversion and the basic principles of rock physics. To examine our predictions we analyzed the hydrate from the
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Atlantis Static Connectivity Study – Predicting Compartmentalization Prior to First Oil
Authors J. A. Reeve and K. F. A. AngelA019 Atlantis Static Connectivity Study – Predicting Compartmentalization Prior to First Oil J.A. Reeve* (BP) & K.F.A. Angel (BP) SUMMARY Every oil field is challenged with understanding and characterizing compartmentalization from the first exploration well to the cessation of production. This challenge is even more pronounced in regions like the Gulf of Mexico where dynamic well test data is seldom available prior to first production. Hence utilization of all available static data to predict field performance becomes essential. But how should we integrate seismic geologic models pressures and fluids in a meaningful way? The Atlantis subsurface team took on this
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Prestack Stochastic Seismic Inversion of the Brenda Field
Authors G. J. Hicks and A. M. FrancisA020 Prestack Stochastic Seismic Inversion of the Brenda Field G.J. Hicks* (Earthworks Environment & Resources) & A.M. Francis (Earthworks Environment & Resources) SUMMARY Joint AI-GI stochastic seismic inversion was performed for 100 pairs of equi-probable AI-GI realizations over the Brenda field which is located in block 15 in the North Sea. Stochastic inversion enables the possible variability in impedance and hence the uncertainty in lithology and fluid classification to be explored. These can be represented using probability and connected probability volumes calculated using joint AI-GI thresholds. EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007
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Petrophysical Seismic Inversion for Porosity and 4D Calibration on the Troll Field
Authors T. Coleou, A. J. van Wijngaarden, A. Norenes Haaland, P. Moliere, R. Ona and J. L. FormentoA021 Petrophysical Seismic Inversion for Porosity and 4D Calibration on the Troll Field T. Coleou* (CGG) A.J. van Wijngaarden (Hydro) A. Norenes Haaland (Hydro) P. Moliere (Hydro) R. Ona (Hydro) & J.L. Formento (CGG) SUMMARY We present an application of petrophysical seismic inversion a method driven by petro-elastic models updating a fine-scale geological model in depth to make it fully compatible with pre-stack seismic measurements on the western part of the Troll Field in the North Sea. The results are being evaluated for infill drilling and for 4D inversion to determine the remaining oil in the thin oil leg. EAGE
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Fractal Behavior of Fractures Derived from Seismic and FMI Data
Authors H. Trappe, H. Endres, P. Thierer, T. Lohr, C. M. Krawczyk, D. C. Tanner, O. Oncken and P. A. KuklaA022 Fractal Behavior of Fractures Derived from Seismic and FMI Data H. Trappe* (TEEC) H. Endres (TEEC RWTH Aachen) P. Thierer (TEEC) T. Lohr (GFZ Potsdam) C.M. Krawczyk (GFZ Potsdam) D.C. Tanner (GZG University Goettingen) O. Oncken (GFZ Potsdam) & P.A. Kukla (RWTH Aachen) SUMMARY This study is part of a larger research project. The results presented are from an area located east of the city Bremen where gas is produced from a deep Rotliegend sandstone reservoir. Faults fractures and associated deformation bands at reservoir depth have an important influence to the productivity of the gas field as fractures are
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Geological and Geophysical Inversion by Hierarchical Classification – Combining Seismic Stratigraphic and AVO Attributes
Authors A. Carrillat, T. Basu, R. Ysaccis, J. Hall, F. Mohamed, A. Mansor, M. Brewer and S. MahmoudA023 Geological and Geophysical Inversion by Hierarchical Classification – Combining Seismic Stratigraphic and AVO Attributes A. Carrillat* (Schlumberger) T. Basu (Schlumberger) R. Ysaccis (Schlumberger) J. Hall (Schlumberger) F. Mohamed (Schlumberger) A. Mansor (Petronas Carigali) M. Brewer (Petronas Carigali) & S. Mahmoud (Petronas Carigali) SUMMARY We present a case study in which both texture facies and fluid prediction are linked by performing a hierarchical classification and estimation scheme whereby a multiattributes volume which captures seismic stratigraphy and texture information is combined with AVO attributes to map fluid response into a single coherent seismostratigraphic and reservoir facies volume. EAGE 69 th Conference
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Nile Delta Reservoir Case Study Using a Novel Broad Band Pre–Stack Seismic Inversion to Rock Properties Technique
By M. E. SmithA024 Nile Delta Reservoir Case Study Using a Novel Broad Band Pre–Stack Seismic Inversion to Rock Properties Technique M.E. Smith* (Geotrace Technologies Inc.) SUMMARY Exploration for hydrocarbons within a concession located onshore in the Nile Delta Egypt has been ongoing for several years however so far has not afforded any significant discoveries. A pre-stack seismic inversion to rock properties procedure using a novel technique to provide broad bandwidth has provided increased understanding of the lithology and highlighted potential reservoir targets. EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 INTRODUCTION Exploration for hydrocarbons within an
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Using 4D Seismic Data and Geomechanical Modelling to Understand Pressure Depletion in HPHT Fields of the Central N Sea
Authors R. Staples, J. Ita, R. Nash, P. Hague and R. BurrellA025 Using 4D Seismic Data and Geomechanical Modelling to Understand Pressure Depletion in HPHT Fields of the Central N Sea R. Staples* (Shell Exploration & Production in Europe) J. Ita (Shell Exploration & Production in Europe) R. Nash (Shell Exploration & Production in Europe) P. Hague (Shell Exploration & Production in Europe) & R. Burrell (Shell Exploration & Production in Europe) SUMMARY 4D is most conventionally used to monitor saturation changes but in high-pressure environments it can be used to indicate pressure compartmentalisation. 4D seismic has been used to investigate compartmentalisation in Central North Sea high-pressure high-temperature (HPHT) reservoirs including
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Elgin-Franklin 4D Seismic – Encouraging Results for Reservoir Monitoring & Development Planning
Authors N. Taylor, L. Ben-Brahim, C. Tindle, G. Joffroy, C. Hubans and A. OnaisiA026 Elgin-Franklin 4D Seismic – Encouraging Results for Reservoir Monitoring & Development Planning N. Taylor* (Total E&P UK) L. Ben-Brahim (Total E&P UK) C. Tindle (Total E&P UK) G. Joffroy (Total E&P UK) C. Hubans (Total Research Center Pau) & A. Onaisi (Total Research Center Pau) SUMMARY Elgin and Franklin are deep HP/HT (1100 bar 190degC) gas condensate fields situated in the Central Graben of the North Sea. A 4D seismic monitor survey was acquired in 2005 four years after production start-up when the reservoir pressure had declined by 600 – 650 bars. Compaction of the reservoir has caused a
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4D Time Strain and the Seismic Signature of Geomechanical Compaction at Genesis
Authors J. E. Rickett, L. Duranti, T. Hudson, B. Regel and N. HodgsonA027 4D Time Strain and the Seismic Signature of Geomechanical Compaction at Genesis J.E. Rickett* (Chevron) L. Duranti (Chevron) T. Hudson (Chevron) B. Regel (Chevron) & N. Hodgson (Heriot-Watt University) SUMMARY The unconsolidated reservoirs of the Genesis field have experienced significant production-related compaction since first oil in 1999. This compaction causes stretching in the overburden and is visible as time-shifts between the monitor and baseline 4D surveys. We measured local time-shifts between these two surveys at every point in the volume and took their vertical derivative to produce an interval estimate of the fractional change in traveltime which we call
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The 3D Reservoir Geological Model – A Hub for 4D Seismic Interpretation
Authors T. Ottesen, I. Magnus, N. B. Jørgensen, L. Vestergaard and M. G. StageA029 The 3D Reservoir Geological Model – A Hub for 4D Seismic Interpretation T. Ottesen* (DONG E&P AS) I. Magnus (PA Resources Norway AS) N.B. Jørgensen (DONG E&P AS) L. Vestergaard (DONG E&P AS) & M.G. Stage (DONG E&P AS) SUMMARY A 3D time-lapse seismic survey was acquired in 2004 over a 50MMbbls Paleocene oil field in the Danish Central Graben to facilitate improved reservoir management and identify potential drilling targets. To obtain a 3D impedance model relationships between reservoir composition porosity fluid fill and acoustic impedance were applied to the 3D reservoir geological model based on log and core
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3D and 4D Seismic AVO Inversion for Updating the Schiehallion Reservoir Model and Prediction of Production Effects
Authors A. C. Evans, H. Dankbaar and J. StammeijerA030 3D and 4D Seismic AVO Inversion for Updating the Schiehallion Reservoir Model and Prediction of Production Effects A.C. Evans* (Shell UK Ltd) H. Dankbaar (Shell UK Ltd) & J. Stammeijer (Shell UK Ltd) SUMMARY Located West of Shetland on the UKCS the Schiehallion Field oil reservoir lies in a Palaeocene deep marine turbidite complex characterized on seismic data by direct hydrocarbon indicators. Amplitude attributes strongly influence the distribution of sand in the full field model built as a reservoir management tool. Recently a test of this existing model involving a comparison of synthetic and real data from a new
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4D Driving Developments at Gannet E & F
Authors R. Staples, J. Brain, K. Hunt, M. Behrens, Y. Charreyron and A. CookA031 4D Driving Developments at Gannet E & F R. Staples* (Shell Exploration & Production in Europe) J. Brain (Shell Exploration & Production in Europe) K. Hunt (Shell Exploration & Production in Europe) M. Behrens (Shell Exploration & Production in Europe) Y. Charreyron (Shell Exploration & Production in Europe) & A. Cook (Shell Exploration & Production in Europe) SUMMARY 4D seismic has been used extensively over the Gannet cluster in the UK Central North Sea since 1998 (Kloosterman et al. 2003 Staples et al. 2005 Staples et al. 2006). Here we focus on recent results from 4D seismic over the
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Full Bandwidth Inversion for Time Lapse Reservoir Characterization on the Girassol Field
Authors P. R. Mesdag, M. Feroci, L. Barens, P. H. Prat and W. PilletA032 Full Bandwidth Inversion for Time Lapse Reservoir Characterization on the Girassol Field P.R. Mesdag* (Fugro-Jason Netherlands BV) M. Feroci (Fugro-Jason UK Ltd London) L. Barens (Total E&P CSTJF Pau) P.H. Prat (Total E&P Luanda) & W. Pillet (Total E&P CSTJF Pau) SUMMARY Full band-width simultaneous inversion was performed on a base and two monitor surveys over the Girassol field offshore Angola. It is well known that the low frequencies need to be added to the band limited seismic data to derive elastic parameter models that are directly related to well log measurements. Careful calibration of the low frequency models
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Scientific Strategy to Explain Observed spectral Anomalies over Hydrocarbon Reservoirs Generated by Microtremors
Authors E. H. Saenger, S. M. Schmalholz, Y. Y. Podladchikov, R. Holzner, M. Lambert, B. Steiner, B. Quintal and M. FrehnerA033 Scientific Strategy to Explain Observed spectral Anomalies over Hydrocarbon Reservoirs Generated by Microtremors E.H. Saenger* (ETH Zurich / Spectraseis) S.M. Schmalholz (ETH Zurich) Y. Y. Podladchikov (PGP Oslo) R. Holzner (Spectraseis) M. Lambert (ETH Zurich) B. Steiner (ETH Zurich) B. Quintal (ETH Zurich) & M. Frehner (ETH Zurich) SUMMARY Worldwide one has observed narrow-band low-frequency (1.5-4 Hz) tremor signals on the surface over hydrocarbon reservoirs (oil gas and water multiphase fluid systems in porous media). These ‘hydrocarbon tremors’ possess remarkably similar spectral and signal structure characteristics pointing to a common source mechanism even though the depth (some hundreds to
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Evaporite Mapping Using High Resolution Passive Seismic Tomography and Kohonen Neural Networks
Authors G. Tselentis, N. Martakis, P. Paraskevopoulos and S. KapotasA034 Evaporite Mapping Using High Resolution Passive Seismic Tomography and Kohonen Neural Networks G. Tselentis* (University of Patras Seismological Laboratory) N. Martakis (LandTech Enterprise SA) P. Paraskevopoulos (University of Patras Seismological Laboratory) & S. Kapotas (LandTech Enterprises SA) SUMMARY Passive seismic tomography application for exploration shows great potential. We present two case studies in Greece that successfully use the passive seismic tomography method in combination with Kohonen neural networks in order to better map subsurface features EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 Introduction Evaporite identification from geophysical data is an important task
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Spatial Reservoir Localization Using Seismic Emission Data
A035 Spatial Reservoir Localization Using Seismic Emission Data V.E. Shulakova* (Geophysical Data Systems Ltd) A.P. Zhukov (Geophysical Data Systems Ltd) M.B. Shneerson (Geophysical Data Systems Ltd) K.I. Loginov (Geophysical Data Systems Ltd) R.G. Kharisov (TNG-group) V.A. Ekimenko (TNG-group) & N.M. Khusnimardanov (TNGgroup) SUMMARY The classic theory of seismic methods assumes that the geological medium is passive and doesn’t generate its own microseism. But in practice we often confronted with seismic activity of geological environment. The authors assert the real geological medium is an active system: it can generate microseism itself. This effect of seismo-acoustic emission becomes pronounced in hydrocarbon reservoir.
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Using Multiple Downhole VSP Arrays for Monitoring and Locating Passive Microseisms in Oil Reservoirs
By Z. C. ChenA036 Using Multiple Downhole VSP Arrays for Monitoring and Locating Passive Microseisms in Oil Reservoirs Z.C. Chen* (CREWES University of Calgary) SUMMARY Using a classical hypocenter location method which depends only on the first arrival times the uncertainties of the hypocenter location as determined by a microseismic monitoring network composed of multiple VSP downhole geophone arrays in the surrounding wells is calculated. Error analysis illustrates that if the multiple arrays are properly designed the events recorded by this kind of monitoring network can be located at an accuracy of 5-10 m in the areas between the arrays. Compared to the
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Determining the Fluid Saturation and Depth of Reservoirs by Passive Seismic SLEC-Monitoring Technology
A037 Determining the Fluid Saturation and Depth of Reservoirs by Passive Seismic SLEC-Monitoring Technology A.V. Volkov* (Institute for New Oil-and-Gas Technologies) O.L. Kuznetsov (Institute for New Oil-and-Gas Technologies) I.A. Chirkin (Institute for New Oil-and-Gas Technologies) I.G. Raylyan (Institute for New Oil-and-Gas Technologies) B.Y. Meltchouk (Institute for New Oil-and-Gas Technologies) V.A. Dyblenko (Oil Engineering Co.) R.K. Khismatullin (Oil Engineering Co.) S.I. Slionkin (Slavneft-NPTS R&P Center) G.V. Kashirin (Slavneft-NPTS R&P Center) V.V. Firsov (Orenburgneft TNK-BP) & G.V. Rogotsky (R&P Company Geoacoustic) SUMMARY Considered is application of passive seismic monitoring technology “Seismic Location of Emission Centers” (SLEC) to determining the fluid saturation type
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Valhall Microseismicity Revisited – Relocated Sources, Seismic Multiplets and S-Wave Splitting
Authors J. M. Kendall, K. De Meersman and M. van der BaanA038 Valhall Microseismicity Revisited – Relocated Sources Seismic Multiplets and S-Wave Splitting K. De Meersman (CGG Veritas) J.M. Kendall* (University of Bristol) & M. van der Baan (University of Leeds) SUMMARY We relocate 303 microseismic events that were recorded in the North Sea Valhall oilfield in 1998. A semiautomated re-picking of P-wave and S-wave arrival times and array based P-wave polarisation analysis improves the accuracy of the locations. Our multiplet analysis identifies 40 multiplet groups that include 208 events. Using cross correlation we then further increase the relative location accuracy between multiplet members. The P-waveform similarities between the different multiplets
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Imaging Micro–Seismicity Using Surface Sensors
Authors K. Chambers, J. M. Kendall, O. Barkved, S. Brandsbreg-Dahl and G. A. JonesA039 Imaging Micro–Seismicity Using Surface Sensors K. Chambers* (University of Bristol) J.M. Kendall (University of Bristol) O. Barkved (BP) S. Brandsbreg-Dahl (BP) & G.A. Jones (University of Bristol) SUMMARY We outline an imaging procedure for micro-seismic events recorded on seismic arrays. The approach is based around stacking all the data consistent with an arrival from a particular time and point in the reservoir. The method does not require any hands on analysis of the data such as picking arrival times which makes it ideal for the application to large arrays of surface sensors. We present results of the migration applied
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A Comparison of Collapsing and Precise Arrival-Time Mapping of Microseismicity
Authors R. H. Jones and J. T. RutledgeA040 A Comparison of Collapsing and Precise Arrival- Time Mapping of Microseismicity J.T. Rutledge (Los Alamos National Laboratory New Mexico USA) & R.H. Jones* (Schlumberger Cambridge Research) SUMMARY In this paper we compare the improvements in microseismic location images obtained using precise arrival times with that obtained by the collapsing technique. We first collapse the initial locations for a hydraulic-fracture dataset from the Carthage Cotton Valley gas field. We then use the precise-arrival-time locations as measure for the effectiveness of the collapsing. Finally we examine the changes when applying collapsing to the precise-arrival-time locations. EAGE 69 th Conference & Exhibition
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Optimization of Gas-Cycling, Voidage-Replacement and Production-Allocation for an Offshore Oil Field
Authors B. Guyaguler and J. W. Da SieA041 Optimization of Gas-Cycling Voidage- Replacement and Production-Allocation for an Offshore Oil Field B. Guyaguler* (Chevron) & J.W. Da Sie (Chevron) SUMMARY The application of an optimization methodology to a rate allocation case study for an offshore oil field is discussed. Conventional allocation methods available in most commercial simulators provide a familiar way for the reservoir engineers to carry out predictions while attempting to honor all desired field group and well operating conditions. However most of these conventional approaches are of a sequential nature and they fail to fulfill the requirements of this real field case. The conventional approaches fail
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Efficient Integration of Pressure Data to Estimate OGIP and Production Rates in Dry-Gas Reservoirs
More LessA043 Efficient Integration of Pressure Data to Estimate OGIP and Production Rates in Dry-Gas Reservoirs Nestor Rivera* (Chevron) SUMMARY Pressure data integration contributes significantly to proper reservoir management in dry-gas reservoirs. In this study we used wellbore and surface pressure data to determine the range of Original Gas in Place (OGIP) and perform production predictions for a large dry-gas reservoir. We developed a process to integrate and process wireline wellhead and gas-lines pressure data resulting in a comprehensive set of static reservoir pressure and dynamic information on well by well basis. Then we built numerical reservoir simulation models for several
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Radius of Investigation and Condensate Banking Evaluation of Gas Condensate Reservoirs
By S. Y. ZhengA045 Radius of Investigation and Condensate Banking Evaluation of Gas Condensate Reservoirs S.Y. Zheng* (Institute of Petroleum Engineering Heriot Watt Univ.) SUMMARY In this work we propose a method to calculate the condensate bank size and the radius of investigation of a well test in a gas condensate reservoir. The work was purely based on numerical flow simulation. We performed some basic multiphase flow simulations in a gas condensate reservoir. Radius of investigation and condensate bank size were both calculated numerically and compared to the single phase radius of investigation formulae. On the basis a new formula is developed for
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Integrated Probabilistic Static and Dynamic Reservoir Modelling, Lunskoye Field, Offshore Sakhalin, Russian Federation
Authors L. Ross, K. King, G. Bodewitz, H. van Hasselt, G. Stone, A. James, W. Swinkels, C. Parsons, T. Addis, W. Twigt, P. Jackson, V. Cholovsky and E. LamersA047 Integrated Probabilistic Static and Dynamic Reservoir Modelling Lunskoye Field Offshore Sakhalin Russian Federation L. Ross* (SEIC) K. King (SEIC) G. Bodewitz (Shell International) H. van Hasselt (Shell International) G. Stone (Shell International) A. James (Shell International) W. Swinkels (Shell International) C. Parsons (SEIC) T. Addis (Shell International) W. Twigt (Shell International) P. Jackson (SEIC) V. Cholovsky (SEIC) & E. Lamers (Shell International) SUMMARY The Lunskoye Field is a centrepiece of the Sakhalin II development one of Shell's most significant current projects. Demand for LNG in the nearby Asia-Pacific market and availability of a large (18.2 Tcf GIIP) gas resource
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Channel-Count Requirements for 3D Land Seismic Acquisition in Kuwait
By G. R. RachedB001 Channel-Count Requirements for 3D Land Seismic Acquisition in Kuwait G.R. Rached* (Kuwait Oil Company) SUMMARY Recent advances in land seismic recording equipment have increased the options available for acquisition geophysicists. There are now four main competing types of sensors. The selection of sensor type is today a major decision in seismic survey design as it will greatly affect the channel-count requirements for 3D land seismic acquisition and the resulting data quality. Channel-count requirements for 3D land acquisition in Kuwait and the concepts involved which are not limited to Kuwait environment are herein presented and their impact examined. The analysis
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Operational Implementation of Full Azimuth, High Density land Acquisition – 3D Irharen (Algeria)
Authors M. Girard, D. Mougenot, C. Paulet, A. Rhamani, J. J. Griso and Y. BoukhalfaB002 Operational Implementation of Full Azimuth High Density land Acquisition – 3D Irharen (Algeria) M. Girard* (Total SA) D. Mougenot (Sercel) C. Paulet (Total) A. Rhamani (Sonatrach) J.J. Griso (Cepsa) & Y. Boukhalfa (Enageo) SUMMARY Using a square spread of dense receiver stations (25 m) a full azimuth dense 3D survey (730 km² full fold 225) was recorded in 2005-06 over the Irharen gas discovery in Algeria. This land acquisition is representative of the coming trends aimed at improving reservoir illumination and anisotropy detection. If the basic square spread (7 200 channels) was defined from geophysical considerations its practical implementation
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How Radar Shaped the Vibroseis Sweep
Authors P. I. Pecholcs, H. Hussein and R. SaadB003 How Radar Shaped the Vibroseis Sweep P.I. Pecholcs* (Saudi Aramco) H. Hussein (Saudi Aramco) & R. Saad (Saudi Aramco) SUMMARY Attenuation of aliased and often scattered vibroseis source-generated coherent surface wave energy is one of the greatest challenges in seismic exploration on the Arabian Peninsula. To evaluate the signal-toground roll energy ratio for different vibroseis sweep designs and test the claimed benefits of in-field shaped sweep design technology (Trantham 1994) we derived a new hybrid nonlinear frequency modulated chirp signal and directly compared several full-fold nonlinear versus linear vibroseis sweep field experiments. Analysis of single-fold source records demonstrate that
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Enhancing the Low-Frequency Content of Vibroseis Data with Maximum Displacement Sweeps
By C. BagainiB004 Enhancing the Low-Frequency Content of Vibroseis Data with Maximum Displacement Sweeps C. Bagaini* (Schlumberger Cambridge Research) SUMMARY The maximum reaction mass displacement in Vibroseis acquisition limits the energy that can be transmitted to the ground at low frequencies. A method to design the low-frequency end of Vibroseis sweeps that optimally uses the vibrator’s mechanical and hydraulic specifications is proposed. This method which is to a large extent independent of the near-surface elastic properties requires vibrator specifications typically provided by the manufacturers and the desired ground-force power spectral density that depends on the geophysical requirements. The outputs of this sweep
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Acquisition Using Simultaneous Sources
Authors J. Stefani, G. Hampson and E. F. HerkenhoffB006 Acquisition Using Simultaneous Sources J. Stefani* (Chevron Energy Technology Company) G. Hampson (Chevron Energy Technology Company) & E.F. Herkenhoff (Chevron Energy Technology Company) SUMMARY We present a technique in which 2 or more shots are acquired during the time it normally takes to acquire 1 shot. The 2 or more shots are fired in a near simultaneous manner with small random time delays between the component sources. A variety of processing techniques are applied to produce the same seismic images which would have resulted from firing the simultaneous shots separately. These processing techniques rely on coherency of the wavefield
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Do We Reduce Noise by Towing Deeper?
By E. MuyzertB007 Do We Reduce Noise by Towing Deeper? E. Muyzert* (Schlumberger Cambridge Research) SUMMARY Common seismic industry wisdom is that a streamer towed close to the surface is noisier than a deeper streamer. Deep tow techniques such as over/under marine seismic acquisition therefore deliver quiet seismic data. An analysis of over/under marine seismic noise records acquired in moderate good weather showed that the reality is more complicated. It was found that the RMS energy of the full bandwidth of a noise record did not decrease with tow depth contradicting conventional wisdom. It was shown the noise records at frequencies above
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Air–Leak Detection Using Frequency Domain Deconvolution
Authors A. J. Day, S. Hegna, G. Parkes and N. TurnbullB008 Air–Leak Detection Using Frequency Domain Deconvolution A.J. Day* (PGS Geophysical AS) S. Hegna (PGS Geophysical AS) G. Parkes (PGS Geophysical AS) & N. Turnbull (PGS Geophysical AS) SUMMARY Air-leaks in marine seismic sources are known to have a detrimental effect on the source signature and they are therefore not tolerated during production. If an air-leak is detected acquisition must cease whilst the fault is rectified leading to costly “downtime”. A method for detecting air-leaks has been developed that makes use of signatures recorded by near-field hydrophones positioned near each gun in an array. The complex spectrum of each trace
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Time Variant Coloured Inversion and Spectral Blueing
By J. P. NeepB009 Time Variant Coloured Inversion and Spectral Blueing J.P. Neep* (BP Exploration Operating Company Ltd.) SUMMARY Seismic reservoir characterisation can be enhanced by applying two post-stack processes to the seismic data: coloured inversion to invert to relative acoustic impedance and spectral blueing to enhance seismic resolution. Both these methods make the assumption that the seismic spectrum does not change in the time window of interest. However attenuation in the earth results in a reducing seismic bandwidth with twoway time so for interpretation of large time windows this constant bandwidth assumption fails. The use of a single operator will then give
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Demystifying Tight–Gas Reservoirs Using Multi–Scale Seismic Data
Authors M. W. Roth, J. Shemeta and T. DavisB010 Demystifying Tight–Gas Reservoirs Using Multi– Scale Seismic Data M.W. Roth* (Transform Software & Services Inc.) J. Shemeta (Pinnacle Technologies) & T. Davis (Colorado School of Mines) SUMMARY Low permeability fluvial reservoirs in the US Rocky Mountain region are estimated to hold nearly 7000 tcf of gas reserves (DOE 2003). In a typical reservoir several hundred feet of stacked sands are gas charged with natural and induced fractures being essential for economic gas production. While “traditional” seismic data is useful for identifying major geologic interfaces and faults the thin and complex nature of these channel sands are typically below seismic
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Indications for Pressure Release from Zechstein Rafts during Late Kimmerian - Implications for Reducing Drilling Risks
More LessB011 Indications for Pressure Release from Zechstein Rafts during Late Kimmerian - Implications for Reducing Drilling Risks J.H. Ligtenberg* (NAM B.V. - Nederlandse Aardolie Maatschappij) SUMMARY Newly acquired 3D seismic data has revealed details that provide additional information to better understand the Late Kimmerian tectonic phase. Within the study area fluid migration pathways were observed at specific locations. Their occurence location and extend suggest a direct relation with this major tectonic event. In addition a direct correlation appears to exist with Zechstein rafts and deep-seated (reactivated) faults and fault intersections. These fluid migration paths are interpreted to indicate pressure release
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RGB Visualisation Based Delineation of Geological Elements from Volumetric Spectral Decomposition of 3D Seismic Data
Authors S. J. Purves, J. Henderson and C. LeppardB012 RGB Visualisation Based Delineation of Geological Elements from Volumetric Spectral Decomposition of 3D Seismic Data S.J. Purves* (Foster Findlay Associates) J. Henderson (Foster Findlay Associates) & C. Leppard (Hydro) SUMMARY The paper describes a novel set of multi-channel RGB 3D visualisation and GeoBody detection and delineation techniques that form the basis of a true spectral decomposition based volume interpretation workflow developed as part of a research and development collaboration between ffA and Hydro. EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 Introduction The spectral content of recorded seismic data is dependent on the
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