Abstract：Transversal isotropic medium is the most typical one of subsurface anisotropic media,and it can he described with 5 elastic constants.The slowness surface near symmetric axes in the medium approximates to an elliptic surface.On the basis of this characteristic,we put forward a new method for deriving elastic constants of transversal isotropic medium from VSP and crosshole travel times.The method can be used to estimate any anisotropic elastic constants of multilayer transversal isotropic medium,without both solving for any linear algebraic equation system and computing NMO velocity of quasi SV一wave.It is shown that correct NMO velocity of quasi SV-wave often can not be obtained in strong anisotropic medium.Theoretical result says that the method is very adaptable and accurate.
张文生, 何樵登. 利用VSP和跨孔走时反演横向各向同性介质中的弹性常数[J]. 石油地球物理勘探, 1997, 32(3): 345-356.
Zhang Wensheng, He Qiaodeng. Deriving the elastic constants of transversal isotropic medium from VSP and crasshale travel times. OGP, 1997, 32(3): 345-356.
