Preserving the elastic amplitude behavior of the recorded primary reflections is necessary to perform any amplitude-versusoffset (AVO) analysis within a prestack image space. We show how the extended subsurface-offset image space is able to preserve the elastic behavior of the primary reflections even when these events are acoustically migrated using a reverse-timemigration (RTM) approach performed in a least-squares fashion. On a single interface model, we show that the amplitude of angle-domain transformed subsurface offset image closely follows the theoretical Zoeppritz response even at critical angle. In addition, on a multi-layer model we demonstrate how a regularization term can improve the coherency of the amplitude across different reflection angles when coarse-shot sampling causes uneven illumination.
Presentation Date: Tuesday, September 17, 2019
Session Start Time: 8:30 AM
Presentation Start Time: 9:20 AM
Presentation Type: Oral