MILANO -- TABLE OF CONTENTS

MILANO -- TABLE OF CONTENTS

Velocity-independent $tau$-$p$ moveout in a horizontally-layered VTI medium [pdf 748K]
Lorenzo Casasanta and Sergey Fomel
Local slopes of seismic events carry complete information about the structure of the subsurface. This information is sufficient for accomplishing all time-domain imaging tasks, without the need to estimate or know the seismic velocity model. We develop a velocity-independent $$ -$p$ imaging approach to perform moveout correction in horizontally-layered VTI media. The effective and interval anisotropic parameters turn into data attributes through the use of slopes and become directly mappable to the zero-slope traveltime. The $$ -$p$ transform is the natural domain for anisotropy parameter estimation in layered media, because the phase velocity is given explicitly in terms of $p$ . Therefore, the $$ -$p$ transform allows for reflection-traveltime modeling and inversion that are simpler than traditional methods based on Taylor-series expansions of traveltime in $t$ -$X$ domain. Synthetic and field data tests demonstrate the practical effectiveness of our method.

MILANO -- TABLE OF CONTENTS