||Wave-equation migration velocity analysis for anisotropic models on 2-D ExxonMobil field data||
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Wave-equation migration velocity analysis for anisotropic models on 2-D ExxonMobil field data
Yunyue (Elita) Li
I apply an anisotropic wave-equation migration velocity
analysis (WEMVA) method on a 2-D ExxonMobil dataset.
I start from the best anisotropic model available from seismic,
walkaway VSPs and check shots. The initial gathers in the subsurface offset
domain are already fairly well focused; however, after inversion using our
WEMVA method, I obtain an image with better continuity and clearer faults.
By looking at the angle gathers,
it is easy to distinguish the contribution of the improved
model from the
contribution of the velocity model.