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Non-linear Slope Tomography for Orthorhombic Pre-stack Time Imaging
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Summary
For WAZ wide-azimuth data, the VTI hypothesis is not always sufficient for insuring focusing of time migration. We propose an extension of non-linear slope tomography for time imaging to the orthorhombic case. We use a model of orthorhombic anisotropy parameterized by five effective parameters, where the effective velocity and eta vary according to the azimuth of the migrated trace. In our approach the five parameters are updated jointly, allowing the extension to the orthorhombic case the advantages of nonlinear slope tomography for time velocity model building, i.e. improved accuracy and turn-around.
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