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- Volume 22, Issue 12, 2004
First Break - Volume 22, Issue 12, 2004
Volume 22, Issue 12, 2004
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Scott explores multi-component business with rxt
By A. McBarnetFormer key man in PGS and GECO, Mike Scott, has launched a multicomponent seismic survey company. He talks to Andrew McBarnet about his plans for rxt.
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Seismic frequency bandwidth constraints in deepwater survey locations
More LessAndrew Long and Iain Buchan of PGS dispel some of the commonly held conceptions about survey design and operations for deepwater seismic.
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How single-sensor, steerable-streamer seismic can improve reservoir performance
By S. PickeringStephen Pickering of WesternGeco provides examples of five different applications of single sensor, digital, marine seismic recording to document his company's belief in Q-Marine technology as an aid to lifetime reservoir management.
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Why OBC is sensitive to the right sensor
Authors D. Ridyard, P. Behn and R. RouquetteDave Ridyard, Phil Behn and Rob Rouquette (Input/ Output) state the case for using accelerometers rather than conventional geophones as part of the recording set up for ocean bottom cable operations.
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Bridging the gap - 4C acquisition using cable and node combinations
Authors M. Hodge and R. DonoghueCombining 4C cable and nodes offers the possibility of achieving maximum seismic coverage over producing offshore fields. Mike Hodge and Rick Donoghue of Multiwave Geophysical explain the technical and operational risks.
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Remaining global resource base is healthy, says IHS report on petroleum trends
IHS Energy's Report on Petroleum Trends (1994-2003), an edited version of which appears here, provides something of a corrective to the doomsters on future world oil and gas supply and demand and a view of the underlying fundamentals that are driving the price of a barrel of oil over $ 50.
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Ardito Desio: Italian geoscience legend who led first K2 ascent
Authors F. di Cesare, F. Aristide and F. GuidiFifty years ago, K2 was conquered for the first time, led by an indomitable Italian Ardito Desio, a scientist, geographer and geologist. Franco di Cesare, Franchino Aristide, and Francesco Guidi contribute a profile of this remarkable man.
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Static corrections for Vibroseis data over sand dunes in western Libya
Authors A. M. A. Ushah and N. R. GoultyParts of the Murzuq Basin in western Libya are covered by linear sand dunes, which reach heights of around 100 m above the gravel plain. The sand dunes cause large increases in the travel times of reflected events in seismic data. In recent years, the conventional method used to calculate field static corrections has been to interpolate the near-surface velocity structure between upholes. Results are often unsatisfactory on lines that cross the dunes because the reflection events contain false structures that correlate with sand dune topography. These structural artefacts are caused by residual static errors which are too large for automatic statics programs to correct during processing. An alternative method of calculating field statics is to pick the first breaks on the Vibroseis field records, calculate the delay times at each station, and use the delay times directly as the field statics after applying a linear adjustment to match them to the upholes. This simple version of the refraction method does not require near-surface velocity-depth models to be produced, and gives much better results than the conventional field static method.
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Multi-attribute seismic analysis - tackling non-linearity
Authors S. Chopra, D. Pruden and V. AlexeevAVO inversion for Lamé parameters (λρ and µρ) has become a common practice as it serves to enhance identification of reservoir zones. Also, integration of AVO-derived attribute volumes with other non-AVO derived seismic attribute volumes can provide meaningful geologic information when tied back to well data and verified as correlating with rock properties. Computation of reservoir properties for determination of mathematical relationships between variables derived from well logs, for example, is usually done with non-linear multivariate determinant analysis using neural networks. This paper provides a case study of a 3D seismic survey in southern Alberta, Canada, where a probabilistic neural network solution was first employed on AVO attributes (Pruden, 2002, Chopra & Pruden, 2003). Using the gamma-ray, acoustic and bulk density log curves over the zone of interest, gamma-ray and bulk density inversions were derived from the 3D attribute volumes. This methodology was successful, in that two new drilling locations derived from this work encountered a new gas charged reservoir, that not only extended the life of the gas pool but added new reserves as well. Later, instead of neural networks, a different mathematical approach using cubic b-splines was utilized for the same purpose. The results were found to be similar, suggesting that apart from neural networks, the cubic b-splines could be used as a tool for tackling non-linearity in multi-attribute seismic analysis.
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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)