
TY  - JOUR
A1  - Nadri, D. 
A1  - Bona, A. 
A1  - Urosevic, M. 
T1  - Nonlinear estimation of Thomsen anisotropy parameters in TI media
JF  - ASEG Extended Abstracts
JO  - ASEG Extended Abstracts
Y1  - 2009
VL  - 2009
IS  - 1
SP  - 1
EP  - 9
KW  - 
UR  - https://doi.org/10.1071/ASEG2009AB030 
N2  - Transverse isotropy with the horizontal axis of symmetry (HTI) is the simplest anisotropic model to characterize a geological formation with vertical fractures. We formulate an azimuthally dependent parametric equation for P-wave traveltimes in a layered HTI medium. Also, assuming a known vertical velocity model, we estimate simultaneously the fracture orientation and Thomsen?s anisotropy parameters in a stack of horizontal layers using a modified preconditioning conjugate gradient algorithm. In a numerical example, we show that in the context of weak anisotropy, Thomsen?s anisotropy parameters (delta and epsilon) and fracture orientation can be efficiently estimated using the P-wave traveltimes without a prior information. 
ER  -

