Elastic modeling and steep dips: unraveling the reflected wavefield

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As part of a larger elastic numerical modeling project, we have been investigating how energy reflected from steeply dipping interfaces is recorded using typical multicomponent acquisition geometries. Specifically, we have been interpreting how rcflection events from the flanks of salt dome structures are distributed on 3C and 4C phones for vertical seismic profiles (VSPs) and ocean bottom seismic (OBS) or land surface surveys. The ultimate goal of this investigation is to improve the structural imaging of steeply dipping interfaces and eventually to evaluate the usc of the recorded elastic wavefield for fluid description near these interfaces. In the current work, ... continued below

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10 p.

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Hoelting, C. J. (Cory J.); Gherasim, M. (Mariana); House, L. S. (Leigh S.) & Marfurt, K. J. January 1, 2003.

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Description

As part of a larger elastic numerical modeling project, we have been investigating how energy reflected from steeply dipping interfaces is recorded using typical multicomponent acquisition geometries. Specifically, we have been interpreting how rcflection events from the flanks of salt dome structures are distributed on 3C and 4C phones for vertical seismic profiles (VSPs) and ocean bottom seismic (OBS) or land surface surveys. The ultimate goal of this investigation is to improve the structural imaging of steeply dipping interfaces and eventually to evaluate the usc of the recorded elastic wavefield for fluid description near these interfaces. In the current work, we focus on a common assumption used when processing converted wave reflection seismic data that most PP energy is recorded on the vertical geophone and/or the hydrophone and that most PS energy is recorded on the horizontal geophones. This is a useful assumption when it is valid, because it eliminates the need for separation of the recorded wavefield into P and S wavetypes. Using two elastic models and different acquisition geometries, we examine the validity of this assumption in the presence of steeply dipping interfaces and discuss the implications for converted-wave and vector imaging of salt flanks.

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10 p.

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  • Submitted to: Annual Meeting of the Society of Exploration Geophysicists, Dallas, TX, October 26-31, 2003

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  • Report No.: LA-UR-03-2356
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976595
  • Archival Resource Key: ark:/67531/metadc930494

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  • January 1, 2003

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 5:47 p.m.

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Hoelting, C. J. (Cory J.); Gherasim, M. (Mariana); House, L. S. (Leigh S.) & Marfurt, K. J. Elastic modeling and steep dips: unraveling the reflected wavefield, article, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc930494/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.