Inversion for elliptically anisotropic velocity using VSP reflection traveltimes |
| |
| Authors: | Z Zhang G Lin J Chen JM Harris L Han |
| |
| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, A-11 Da-tun Road, Chao-Yang District, Beijing 100101, China,;Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China,;Department of Geophysics, Stanford University, Stanford, CA 94305-2215, USA, and;Department of Geophysics, Jilin University, Changchun, China |
| |
| Abstract: | This paper presents a traveltime inversion approach, using the reflection traveltimes from offset VSP data, to reconstruct the horizontal and vertical velocities for stratified anisotropic media. The inverse problem is reduced to a set of linear equations, and solved by the singular value decomposition (SVD) technique. The validity of this inversion scheme is verified using two sets of synthetic data simulated using a finite‐difference method, one for an isotropic model and the other for an elliptically anisotropic model. The inversion result demonstrates that our anisotropic velocity inversion scheme may be applied to both isotropic and anisotropic media. The method is finally applied to a real offset VSP data set, acquired in an oilfield in northwestern China. |
| |
| Keywords: | |
|
|
