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VTI migration velocity analysis using RTM

Yunyue (Elita) Li, Peng Shen and Colin Perkins


We use a vertical transverse isotropic (VTI) two-way propagation engine to perform wave-equation migration velocity analysis. Using reverse time migration (RTM), we have a chance to characterize the wavefields propagating at large angles and to image steeply dipping reflectors. By including VTI Thomsen parameters, we can better describe the properties of the subsurface. We first derive the migration velocity analysis gradient when using a first-order VTI two-way wave-equation. Then, we test our method on a synthetic VTI Marmousi model. The inversion results show that our method can resolve a better velocity model and a better-focused subsurface image.