各向异性介质中的弹性阻抗及其反演

Elastic impedance and seismic inversion in anisotropic media

地震反演已成为油藏描述中的重要组成部分.绝大多数的常规地震反演是叠后地震数据体上进行,很少考虑各向异性存在的情况.随着勘探开发的发展,地震各向异性和叠前地震波阻抗反演引起了人们极大关注.本文在各向同性介质中弹性阻抗研究基础上,推导出了各向异性介质中的弹性阻抗方程,提出了地震各向异性介质中用弹性阻抗进行储层参数描述的技术路线和框架,并对反演过程中存在的问题进行了有益探讨.

Seismic impedance inversion has become an integral part of the reservoir characterization. Now most conventional impedance inversion has been focused on the post-stack seismic data, because there is relatively little consideration of the impact of anisotropy on impedance inversion, despite the increasing widespread acceptance that sedimentary rocks, and in particular shales, are often quite strongly anisotropy. Such then ,the seismic anisotropy and prestack seismic inversion has become the hot topics. Based on the study of the elastic impedance in isotropic media, we derived the elastic impedance equation in anisotropy media, putted forth the parametric reservoir characterization workflow about the elastic impedance, discussed the existent problems in seismic inversion.