Birefringence Analysis of Converted S-Waves in Orthorhombic Media – A Simplified Approach

P024 BIREFRINGENCE ANALYSIS OF CONVERTED S-WAVES IN ORTHORHOMBIC MEDIA: A SIMPLIFIED APPROACH Summary 1 The S-wave birefringence in anisotropic media is defined by the apparition of two distinguished Swaves with their own eigen polarisations and velocities. The analysis and compensation of this birefringence are essential to preserve the resolution of S-waves. In this paper we analyse the simplifications that can be obtained in the case of orthorhombic media using two approximations: weak anisotropy and additive composition of a TIV medium with a parallel fractures set. If in addition we restrict the propagation of S-waves to small incidence angles (as often