Publication Name: PESA News
Authors: Graeme Eastwood, Fugro Seismic Imaging
Publication Issue: 117
Date Published: April 2012
Number of Pages: 7
Abstract:
0ver the last few years, it has become common practice to account for vertical or tilted transverse anisotropy (VTI!TTI) during the migration process. This takes account of the velocity anisotropy caused by seismic waves travelling through layered media. What is less often considered is the effect of horizontal transverse anisotropy (HTI), most often caused by vertical or sub-vertical fracturing and faulting. Fractures and faults tend to align perpendicular to the dominant stress direction, possibly causing differences in the velocity of seismic waves travelling parallel compared to those propagating perpendicular to the fractures.