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Azimuthal Anisotropy Resolved By Tilted Orthorhombic TomographyGold Open Access

Authors: C.J. Rudling, A. Riaz and J. Smith
Event name: First EAGE/PESGB Workshop on Velocities
Session: Anisotropy Insights
Publication date: 22 February 2018
DOI: 10.3997/2214-4609.201800002
Organisations: EAGE
Language: English
Info: Abstract, PDF ( 481.58Kb )

Summary:
This paper explains a qualitative and quantitative approach to identify and resolve P wave TTI and HTI variations in the depth migration velocity model building process. The combination of these effects can be represented by an orthorhombic model with three mutually orthogonal planes of mirror symmetry; the P-waves in each symmetry plane can be described kinematically as an independent TI model (Song and Alkhalifah, 2013). Orthorhombic velocity model building and imaging tools are required to address both HTI and TTI simultaneously in subsurface. The orthorhombic anisotropy has been correctly identified and resolved, which has subsequently resulted in a high resolution velocity model (figure 8). A combination of the accurate velocity model building and advancement in the pre-processing techniques has shown significant uplift in the image quality on the earlier processing. The re processed PreSDM has provided improved coherency, recovered improved bandwidth, enhanced character, and better fault plane definition.

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