Orthorhombic anisotropy is typical of naturally fractured reservoirs. This type of anisotropy is caused by a single system of vertical fractures embedded in a horizontally layered medium. Arbitrary orthorhombic elastic anisotropy can be characterized by ten independent parameters, one of which is density. In the best of circumstances, only six of these parameters can be reliably inverted from the P-wave scattered energy. Thus, we access the resolution of S-wave inversion from the wavenumber

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... mination perspective and show that S waves can resolve the remaining orthorhombic parameters. Topics Seismic Anisotropy in Fractured Reservoirs, Seismic Imaging -Theory, Full Waveform Seismic Inversion Main objective Investigate spatial resolution for the orthorhombic inversion of S waves. New aspects The null-space of the orthorhombic inversion of S waves is derived analytically. The concept of the effective illumination angle is applied to understand the number of recoverable parameters.