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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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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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  2. Anisotropy
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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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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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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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2007 CSPG CSEG Convention paper on geoscience integration
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Vestrum, R.W., 2007, Geoscience integration and interpretive model building to overcome seismic imaging problems in foothills environments: 2007 CSPG CSEG Convention, Calgary, Canada.

  • Originally compiled for an ACGGP dinner in Bogotá in 2006.

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2006 paper on model building in Colombia
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Vestrum, R.W., 2006, Seismic imaging and interpretive model building in the Colombian Andes: IX Simposio Bolivariano, Cartagena, Colombia.

  • This manuscript describes the problems of sideslip and smear before going into the interpretive model-building methodology.

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2005 CSEG paper on plains depth imaging
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Vestrum, R.W., Link, B., and Mathewson, J., Why does depth migration work so well in the plains?: 2005 Natnl. Mtg., Can. Soc. Expl. Geophys.

  • Technology overview with data examples from four competing seismic-processing shops.

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