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A practical approach to PP seismic angle tomography
- Source: Geophysical Prospecting, Volume 52, Issue 6, Nov 2004, p. 663 - 669
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- 02 Nov 2004
Abstract
The use of the differential semblance misfit function on common‐image‐point gathers in the angle domain lends itself to an automated tomographic approach through a gradient‐based search in the model space. The velocity model is described by a layer‐based model with linear velocity trends and a superimposed bicubic B‐spline. The interfaces of the layer‐based model are computed by map migration of the PP zero‐offset traveltimes of key reflectors. The common‐image‐point gathers are produced by a restricted inverse generalized Radon transform or amplitude‐versus‐angle‐compensated migration. We present a complete description of all 2.5D formulae for isotropic velocity analysis of PP reflections and the results for ocean‐bottom seismic data.