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- Volume 26, Issue 9, 2008
First Break - Volume 26, Issue 9, 2008
Volume 26, Issue 9, 2008
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The future of rock physics: computational methods vs. lab testing
Authors J. Dvorkin, M. Armbruster, C. Baldwin, Q. Fang, N. Derzhi, C. Gomez, B. Nur and A. NurJack Dvorkin,Meghan Armbruster, Chuck Baldwin, Qian Fang, Naum Derzhi, Carmen Gomez, Boaz Nur, Amos Nur, and Yaoming Mu propose the novel use of a virtual rock physics laboratory as a pragmatic way to improve the quantifying and understanding rock without damaging the usefulness of rock samples for further experimentation.
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High resolution age dating of the Shuaiba Formation by means of calcareous nannofossils
Authors A.M. Gombos Jr., C.J. Strohmenger and T.C. HuangAndrew M. Gombos, Jr., Christian J. Strohmenger and T.C. Huang do some geological age dating detective work on the Shuaiba Formation in Abu Dhabi using calcarareous nannofossils as their clues.
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Observations on the petroleum potential of deep offshore west coast India from newly reprocessed 2D seismic data
Authors G.A. Roberts, K. Rutherford and C. O‘BrienGlyn Roberts, Ken Rutherford and Colin O’Brien suggest that application of modern processing techniques has identified a deeper Mesozoic play offshore the west coast of India.
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General surface multiple prediction: a flexible 3D SRME algorithm
Authors I. Moore and B. DragosetIdeal 3D SRME (surface-related multiple elimination) has geometric requirements for its input data that are not met by marine streamer surveys. Ian Moore and Bill Dragoset offer a solution supported by field data examples which uses a modified algorithm based on a multidimensional nearest-neighbour search to find recorded traces that are closest, in a Euclidian sense, to the desired traces demanded by ideal 3D SRME.
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Wide azimuth imaging and azimuthal velocity analysis using offset vector tile prestack migration
Authors A. Calvert, E. Jenner, R. Jefferson, R.I. Bloor, N. Adams, R. Ramkhelawan and C. St. ClairAlexander Calvert, Edward Jenner, Robert Jefferson, Robert Bloor, Nicola Adams, Rosemarie Ramkhelawan and Chris St. Clair make the case for the application of vector offset binning to many of today’s wide azimuth surveys. They say the approach is a natural complement to the surface-fitting method for azimuthal anisotropy analysis and used together allow efficient post-migration analysis for velocity anisotropy, providing insights into subsurface fracturing and stress.
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Controlled beam migration: a versatile structural imaging tool
Authors V. Vinje, G.A. Roberts and R. TaylorVetle Vinje, Graham Roberts and Roger Taylor discuss an enhancement of Gaussian beam migration for depth imaging in complex geological environments supported by a number of case studies.
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Gleaning meaningful information from seismic attributes
Authors S. Chopra and K.J. MarfurtSeismic attributes form an integral part of most of today’s interpretation projects. Attributes enhance subtle features in the seismic data that may otherwise be overlooked or require a great deal of time to map. The quality of attribute displays is directly proportional to the quality of the input seismic data. Ideally, all amplitude, phase, and travel time distortion effects due to near-surface and overburden heterogeneities as well as those introduced by acquisition and processing should be optimally handled, even if they cannot be totally eliminated. In practice, even with careful acquisition, processing, and imaging, our data will still exhibit a certain level of noise. We show how structure-oriented filtering can eliminate random noise, with the principal component filter providing better results than the more familiar mean and median filters. The acquisition footprint is a form of coherent, rather than random, noise and requires a different filtering approach, ideally in the prestack domain prior to stacking. Finally, we show that different implementations of a given attribute can make a difference, with energy ratio coherence providing more robust images than semblance. We illustrate these findings through application to a suite of examples from Alberta, Canada.
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Where has all the pressure gone? Evidence from pressure reversals and hydrodynamic flow
Authors S. O‘Connor, R. Swarbrick and D. JonesDirect measurements of pore pressure in shales are usually not possible because of the low permeabilities, but shale pore pressures may be estimated using well-log or seismic data. Measured pressures in adjacent reservoir beds are used to calibrate the estimated shale pore pressures, a methodology that works well where reservoirs are restricted in volume and without significant leakage. Analysis of pressure data from many basins with substantial hydrocarbon reserves shows significant pressure drawdown due to lateral drainage along inclined reservoirs and through faults to shallower levels. When the direct measurements of pore pressure used for calibration have been made in reservoirs that have experienced lateral drainage, the shale pore pressures are underestimated. Consequently, mud weights selected for drilling may be too low, leading to the risk of fluid influx and blow out when encountering other reservoir beds that are sealed by encasing shales. Furthermore,understanding the geological context for overpressure development is useful in exploration because of the implications for hydrocarbon migration, hydrodynamic trapping, and hydrocarbon column height assessment.
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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)