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  1. 2017
  2. 2D seismic
  3. Anisotropy
  4. Case history
  5. Depth imaging
  6. Myanmar

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CSEG Recorder 2017: Myanmar PSDM case history

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Vestrum, R.W., Gonguet, G., and MacArthur, T., 2017, Geologically Constrained Anisotropic Depth Imaging in the Central Burma Basin, Onshore Myanmar, CSEG Recorder.

  • 2D seismic imaging along the foothills of the Indo-Burma range
  • Interpretive geologic constraints required for model building in noisy seismic data
  • Resulting seismic images showed structural details that time processing could not fully image.

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  1. 2016
  2. AAPG
  3. Anisotropy
  4. Depth imaging
  5. Modelling

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AAPG ICE Barcelona 2016: Impact of a tightly folded anisotropic layer on imaging in Papua New Guinea – a modelling study

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Cameron, G.H., Gillam, D., and Vestrum, R.W., 2016, Impact of a tightly folded anisotropic layer on imaging in Papua New Guinea – a modelling study. AAPG ICE, Barcelona, Spain.

  • FD acoustic anisotropic modelling quantifies the imaging problem resulting from tight folds in the near surface
  • TTI PSDM is sensitive to the model dip
  • Surface-geology measurements helped constrain model dip

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AAPG ICE Barcelona 2016: Lithostatic-load effects in geologically constrained model building for foothills anisotropic seismic imaging

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Vestrum, R.W., Cameron, G.H., and Vestrum, Z.E., 2016, Lithostatic-load effects in geologically constrained model building for foothills anisotropic seismic imaging. AAPG ICE, Barcelona, Spain, 325-325.

  • Lithostatic load is another geologic constraint we may apply to areas of low signal and high complexity
  • We create more lithologically consistent velocity models by separating out compression effect
  • More consistent models improves 3D mapping from 2D lines

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  1. 2015
  2. 2D seismic
  3. 3D seismic
  4. Depth imaging
  5. Peru
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EAGE Madrid 2015: Creating a 3D Geologic Model for 2D Depth Migration in the Peruvian Andes

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Vestrum, R.W., Vilca, J., Di Guilo Colimberti, M., 2015, Creating a 3D Geologic Model for 2D Depth Migration in the Peruvian Andes, 2015 EAGE Conf & Exhibition, Madrid, Spain.

  • Consistent velocity model across multiple 2D lines by building the velocity model in 3D
  • Interpretive 3D velocity model minimized misties at line intersections
  • Final PSDM results removed subthrust velocity pull-up

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AAPG Explorer: Why 2D lines do not tie when beds are dipping

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Vestrum, R.W., 2012, In overthrust settings, tie, tie (2-D) again, AAPG Explorer, August 2012, p 38.

  • Discusses the interpretation pitfall of trying to tie 2D lines
  • Offers a strategy to try to overcome the 2D line-tie problem.
  • Rob did not pick the title, it was set by the editor ;-)

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IGC Istanbul 2012: 2D case history from southern Turkey

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Vestrum, R.W., Layzell, M., and Gittins, J., 2012, Seismic imaging and interpretation over Antep Block, southeast Turkey: Istanbul Internat. Geophys. Conf., Istanbul, Turkey, 17-19 September 2012.

  • Time and depth imaging of 2D data over extensional tectonics.
  • Highlights importance of collaboration between interpretation and processing teams.

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  1. 2011
  2. 3D seismic
  3. Case history
  4. First Break
  5. Pakistan
  6. Publications
  7. Time processing

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2011 First Break: 3D case history from the Himalayan foothills of Pakistan

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Vestrum, R.W., Dolgov, V., Wittman, G., Csontos, L, and Gittins, J., 2011, 3D seismic imaging over two structurally complex seismic surveys in the foothills of Pakistan: First Break 29, no. 4, 61-70.

  • Time processing and merge of two 3D surveys over highly complex geology.
  • Illustrates our back-to-basics workflow where no single technology stood out in the processing, but careful attention to details in fundamental processes created a readily interpretable seismic volume.

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  1. 2010
  2. Anisotropy
  3. Geophysical Prospecting
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2010 Geophysical Prospecting: Understanding anisotropic imaging problems

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Vestrum, R.W., and Lawton, D.C., 2010, Reflection point sideslip and smear in imaging below dipping anisotropic media: Geophysical Prospecting, 58, 541–548.

  • In folded and faulted geologic settings, dipping anisotropic strata above exploration targets blur and misposition imaged seismic reflectors. Correcting for these anisotropic effects can significantly reduce exploration risk.
  • Raytracing and numerical seismic models illustrate and quantify anisotropic imaging problems to show the importance of correcting for anisotropy in seismic imaging.

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  1. 2009
  2. 2D seismic
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  5. First Break
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2009 First Break article illustrates our focus on geophysics fundamentals

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Vestrum, R.W., and Gittins, J.M., 2009, Technologies from foothills seismic imaging: replacements or complements?: First Break, 27, no. 2, 61-66.

  • The editor describes this paper: “Our land seismic section begins with a provocative article challenging the assumption that only new technologies will do.”
  • Sven Trietel suggests that this philosophical discussion “ought to be made ‘must’ reading for any newcomer to our game.”

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  1. 2009
  2. 3D seismic
  3. Anisotropy
  4. Case history
  5. Colombia
  6. Depth imaging
  7. Publications

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2009 AAPG Convention case history from Colombia with Isabel Florez at Hocol

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Vestrum, R.W., Florez, I.C., and Gittins, J.G., 2009, Anisotropic depth migration in the Colombian Llanos Foothills as a key to understanding the structure in depth: 2009 AAPG ACE, Denver, USA.

  • This case history shows the unpredictable nature of imaging below for lateral-velocity heterogeneity and seismic anisotropy. The surprise ending shows how the imaged structures move as we correct for each wave-propagation effect.

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