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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
21 - 40 of 574 results
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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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