We estimate anisotropy for FTI, TTI and Orthorhombic media

Isotropic vs. Anisotropic

  • In depth imaging, TGS can handle isotropic media or VTI, TTI and ORT anisotropic effects
  • Transverse isotropy is usually seen in situations with neatly ordered sedimentary layers.
  • The most typical anisotropic media to consider are transversely isotropic (TI), where the velocity normal to the bedding is lower than along it, and which may be vertical (VTI) or tilted (TTI).
  • Orthorhombic anisotropy extends the TI model to allow for azimuthal variations in velocity.
  • Orthorhombic anisotropy is often related to situations with anisotropic subsurface stress, such as in the presence of aligned fracture systems.
  • Due to its relationship to fractures, orthorhombic models are appropriate and useful for land surveys of unconventional resources.
  • Orthorhombic model parameters may serve as interpretable volumes describing fracture behavior.
  • These anisotropy parameters can all be updated using Tomography.


Yang He, Adam Gersztenkorn, Guy Hilburn, Sherry Yang, and Bin Wang (2013) Orthorhombic PSDM processing, a case history in Mississippi Canyon, Gulf of Mexico. SEG Technical Program Expanded Abstracts 2013: pp. 3799-3803.

Guy Hilburn, Amit Pendharkar, William Keller, René Mott, Jorge Peinado, Austin Jumper, and Victor Kriechbaum (2017) Fracture detection and reservoir characterization through high-resolution orthorhombic tomography for unconventional plays. SEG Technical Program Expanded Abstracts 2017: pp. 332-336.

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TGS offers subsurface data, including seismic, magnetic and gravity data, multibeam and coring data, digital well and production data as well as processing and interpretation from deepwater offshore to conventional and unconventional onshore plays.

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