The Study of Influence Factors of the Transmission Coefficient Anisotropy

Abstract

In anisotropic media, the P-wave reflection coefficient varies with the incidence and azimuth phase angles. The azimuthal anisotropy of horizontal transverse isotropy (HTI) media is used to detect fractures in the reservoir. In this paper, we introduce the reflection and transmission coefficient at interfaces between two weakly anisotropic HTI media. The transmission coefficient anisotropy is often neglected, but sometimes such neglect will lead to large error. By using a synthetic data example, we demonstrate that the anisotropic intensity of transmission coefficient can be stronger than that of reflection coefficient. There are many factors which can influence the anisotropy of the transmission coefficient. Through analysing, we show that the ratio of impedance of the lower medium to that of the upper medium is the key factor which can significantly affect anisotropic intensity of the transmission coefficient. The transmission coefficient anisotropy is significant when the impedance difference of the lower and upper media is very large and the lower layer has a strong anisotropy which is often the case in the Sand and Mud Interbed Model.