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- Volume 12, Issue 9, 1994
First Break - Volume 12, Issue 9, 1994
Volume 12, Issue 9, 1994
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Resolving interfering events through cyclic sampling and median filtering
Authors L. Bruland and T.A. JohansenAnalysis of a seismic event in prestack data is of ten impeded by interfering events. In such cases it is of interest to remove the interfering events in such a way that neither the amplitude nor the phase of the target event is severely distorted. This is a crucial consideration in amplitude versus offset (AVO) analysis, for example. A common method of tackling this problem is to apply an f-k filter to remove the interfering events. This requires that the target event and the interfering events show sufficient difference in moveout (or dip) at all offsets, which is not always the case. For example, in a common midpoint (CMP) gather the difference in moveout between interfering primary and multiple events may be too small, especially for short offsets. Sharp edges to the filter in f-k space are likely to introduce artifacts in the data (Gibb's phenomenon).
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Sequence stratigraphic interpretation of 3D seismic data offshore Louisiana - a case study
Authors B.A. Reymond and G.M. StampfliThe morphology of the different sedimentary packages or systems tracts that compose stratigraphic sequences are now weil known, having been defined from 2D vertical seismic sections (Vail et al. 1977). This knowledge has since been extended to field outcrops, mainly in carbonate sequences (Ponsot and Vail 1991; Jacquin 1992) where as the initial definition was applied to clastic passive margins sediments. Recent studies on the Quaternary sediments of the Gulf of Mexico have tried to identify and describe in greater detail the morphology of the different sedimentary facies with respect to relative sea level change (Anderson et al. 1990; Abdulah and Anderson 1991). In this study we apply the principles of seismic facies interpretation to images of sub-horizontal surfaces provided by high-resolution 3D seismie data. Such a 3D sequence stratigraphic interpretation of chosen reflectors is shown to be a potent tool for the location of subtle sedimentary events, both in space and time.
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Concetric circle 3D: optimization of salt diapir flank imaging, UK Central North Sea
Authors J.M. Reilly and G.A. HirdOptimal imaging of reflection energy in steep dip structural environments requires that the data be acquired and processed in such a way that the primary reflections are stacked constructively, as well as correctly migrated. In certain structural situations special acquisition geometries can be employed which substantially contribute to the overall goal of enhanced imaging of the subsurface. In 1992 the first concentric circle 3D seismic survey was shot in the North Sea. The objective of the survey was to accurately image the flanks and the top of a salt diapir. The final processed dataset was compared to data acquired using 2D radial and conventional linear 3D survey techniques. The results indicate that the concentric circle 3D dataset appears to contain more information adjacent to the diapir flanks than either the 2D radial or conventionallinear 3D datasets.
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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)