Compensation for the Azimuthal Anisotropy of PS-converted Waves in HTI Media

This paper studies the azimuthal anisotropy of PS-converted waves recorded in the horizontal radial and transverse components in HTI media. Due to converted wave splitting, the horizontal radial and transverse components contain two types of converted wave: the fast P-SV1 and the slow P-SV2 that propagate along the directions parallel and perpendicular to the fracture strike, respectively. The NMO velocity variations of both the P-SV1 and P-SV2 waves are close to two different ellipses. Therefore it is necessary to analyse and compensate individually for the azimuthal anisotropy of each of the P-SV1 and P-SV2 waves. By applying two NMO-velocity ellipses to the synthetic and field data, the NMO correction results are improved.