弹性波阻抗在实际应用中,需要对入射角进行估计,由于误差的原因可能出现sin2θ〉1的情况,这使得弹性波阻抗反演很不稳定。为此,Whitcombe等(2002)用tanχ代替sin2θ,提出了扩展弹性波阻抗,改善了弹性波阻抗反演的稳定性。本文以Aki-Richards(1980)的Zeoppritz三项简化式为基础,改进了Whitcombe等的扩展弹性波阻抗,改进后的扩展弹性波阻抗提高了计算精度。
When elastic impedance is used in practice, it,needs to estimate the incidence angle, sin^2 θ (where θ is the incident angle) may exceed unity because of the existence of errors, which makes elastic impedance inversion extremely unstable. Used tan Х substitute for sin20 (Whitcombe et al., 2002) derived the extended elastic impedance, improved the stability of elastic impedance inversion. Based on the three term Zoeppritz equation (Aki and Richards, 1980), this article improves Whitcombe's extended elastic impedance. The improved extended elastic impedance increases the computational precision.