
TY  - JOUR
A1  - Zdraveva, Olga 
A1  - Bloor, Robert 
A1  - Nichols, Dave 
T1  - Anisotropic depth imaging in presence of stress: transversely Isotropic or orthorhombic?
JF  - ASEG Extended Abstracts
JO  - ASEG Extended Abstracts
Y1  - 2015
VL  - 2015
IS  - 1
SP  - 1
EP  - 4
KW  - 
UR  - https://doi.org/10.1071/ASEG2015AB082 
N2  - Presence of oriented stresses and fractures in the subsurface can pose significant challenge when imaging wide-azimuth and multi-azimuth data using transverse isotropy as an approximation to describe the medium. We describe the key components of an orthorhombic model-building and updating workflow for depth imaging in areas affected by stress. We discuss several different options for deriving the initial parameters describing orthorhombic medium and their dependencies on the geometry of the available seismic data. We demonstrate the effectiveness of the workflow on real data from the Gulf of Mexico. Compared to transversely isotropic imaging, the orthorhombic imaging flattens the common-image-point gathers in all azimuths and results in improvements of image focussing. 
ER  -

