Month and year defended: March, 2009

Wave-equation migration using one-way wavefield extrapolation is commonly used to generate images of complex geologic structure from 3D seismic data. Most conventional wave-equation approaches restrict propagation to downward continuation, where wavefields are recursively depth extrapolated on Cartesian meshes. In practice, this approach exhibits limited high-angle accuracy and is restricted to down-going waves, which precludes using some steep-dip and all turning wave components important for imaging in complex geology. This thesis presents a strategy for improving one-way propagation accuracy based on posing wavefield extrapolation on generalized geometries more conformal to the propagation direction. By employing...

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