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- Volume 26, Issue 6, 2008
First Break - Volume 26, Issue 6, 2008
Volume 26, Issue 6, 2008
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How EM survey analysis validates current technology, processing and interpretation methodology
More LessStåle Johansen, Ketil Brauti, Stein Fanavoll, Hans Amundsen, Tor Atle Wicklund, Jens Danielsen, Pål T. Gabrielsen, Lars Lorentz, Michael Frenkel, Benjamin Dubois, Ole Christensen, Kathrine Elshaug and Stig A. Karlsen of Electromagnetic Geoservices (EMGS)** provide the most comprehensiv study to date of how the company’s offshore electromagnetic survey method (seabed logging) for the E&P oil and gas industry successfully compares with well evaluation results.
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Salt mapping in the Gulf of Mexico using marine magnetotellurics
Authors S.K. Sandberg, X. Wu and T. RoperStewart K. Sandberg, Xianghong Wu and Thomas Roper of WesternGeco Electromagnetics describe the benefits of adding marine magnetotelluric (MMT) technology to the survey mix when imaging complex geological settings such as the Gulf of Mexico subsalt.
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Extending seismic bandwidth using the continuous wavelet transform
Authors M. Smith, G. Perry, J. Stein, A. Bertrand and G. YuMichael Smith, Gary Perry, Jaime Stein, Alexandre Bertrand and Gary Yu describe the realization of a Bandwidth Extension technique with synthetic and real examples.
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Full wavefield 3D tomography: a case study in ITF research funding
By M. JoswigPart of leveraging technology comes from sowing financial seed corn to develop new ideas and concepts. Here we follow the ongoing funding by the UK’s Industry Technology Facilitator* of a geophysical application for higher resolution imaging of reservoirs proposed by Imperial College.
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Pitfalls in the analysis of low frequency passive seismic data
Authors P. Hanssen and S. BussatPeter Hanssen and Sascha Bussat of StatoilHydro highlight the importance in hydrocarbonmicrotremor passive seismic survey analysis of distinguishing anthropogenic noise and nearfield effects from potential direct hydrocarbon indicators with a case study from Libya.
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Nanoseismic monitoring fills the gap between microseismic networks and passive seismic
By D. AndersonManfred Joswig introduces the concept of nanoseismic monitoring as a third method (microseismic networks and passive seismic being the others) to record upper Crust or surface layer fracture signals, and to locate them in space and time. First results of low-SNR aftershock monitoring for nuclear arms control purposes demonstrate the method and its potential.
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Seismic monitoring of fracture processes generated by a creeping landslide in the Vorarlberg Alps
More LessMarco Walter and Manfred Joswig present the results of an application of nanoseismic monitoring (see separate article by Joswig) in which seismic mini-arrays were deployed on the creeping Heumoes landslide (HL) in the Vorarlberg Alps, Austria in an attempt to detect seismic activity possibly generated by the unstable landmass, consisting of glacial sediments.
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Sequence stratigraphy-keyed geological modelling of Upper Thamama carbonate reservoirs for a giant Abu Dhabi oil field
Authors C.J. Strohmenger, T. Al Dayyani, A.B.S. Clark, A. Ghani and H.H. HafezChristian J. Strohmenger, Taha Al-Dayyani, Andrew B.S. Clark, Ahmed Ghani and Hafez H. Hafez illustrate how core and well-log data were used to establish a sequence stratigraphic framework and a lithofacies scheme as input to a geological model to provide better prediction of the vertical and lateral distribution of reservoir quality and continuity in a major Abu Dhabi oil field.
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Modelling the Boda Aleurolite Formation (BAF) based on core analyses using a laser-induced plasma spectrometer
Authors G. Maros, L. Andrássy, L. Zilahi-Sebes and Z. MáthéGyula Maros, László Andrássy, László Zilahi-Sebes and Zoltán Máthé describe the use of a mobile core scanner and its integral laser induced plasma spectrometer (ImaGeo-LIPS) in a geological assessment of the the Boda Aleurite Formation (BAF) as a potential site for the disposal of high-level radioactive wastes.
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Where will Russian oil come from in 10 years' time?
Authors K. Sobornov, A. Efimov and N. MalyshevKonstantin Sobornov, Arkady Efimov and Nikolay Malyshev believe that new seismic, drilling and other technologies to meet the challenges of remote and complex geologies may do much to offset the gloomier predictions about future Russian oil and gas developments.
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Structural models: optimizing risk analysis by understanding conceptual uncertainty
Authors C.E. Bond, Z.K. Shipton, A.D. Gibbs and S. JonesAbstract Geoscience may be regarded as an uncertain science, as it is often based on the interpretation of equivocal data. Analysis of multiple interpretations of a single dataset has shown that conceptual uncertainty can result in a wide range of interpretational outcomes. Many geological models based on a wide variety of concepts were developed by different geoscientists for the same dataset. In this paper we suggest methods to improve the effectiveness of interpretation workflows based on understanding of how geoscientists apply concepts to equivocal datasets, the processes they use, the effects of their previous experience, and their use of broader contextual information. We argue that understanding the influence of conceptual uncertainty on interpretation of equivocal data and modification of current workflow practices can improve risk management.
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Effects of pre-processing on reverse time migration: a North Sea study
By I.F. JonesAbstract Almost all conventional pre-processing is conceived with one-way wave propagation in mind. If we take into account the existence of events arising from two-way wave propagation, then many of the underlying assumptions of moveout behaviour implicit in some pre-processing techniques must be re-evaluated. Using 2D synthetic data, we demonstrate that the moveout behaviour of double bounce arrivals (a class of two-way propagating events) can be compromised by pre-processing designed to remove events exhibiting ‘anomalous’ moveout behaviour. These observations are of interest to us because we are now beginning to employ two-way migration schemes to image complex structures. However, if we continue to use conventional pre-processing techniques, we run the risk of removing the very events we are trying to image. The observations made on the basis of synthetic modelled data are extended in this work to real data examples, all from the North Sea, where in the Central Graben we commonly have steep-sided salt diapir piercements, which are good candidates for producing useful double bounce arrivals that can be imaged using reverse time migration.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)