3x3C Seismic’s Sensitivity Analysis on Near-Surface towards Full Waveform Inversion
Résumé
Full Waveform Inversion (FWI) is a high-resolution seismic imaging tool which has been intensively developed during the past decade. At the near surface scale, FWI faces several challenges including 3D acquisition deployment, a strong presence of elastic effects, relatively high attenuation effects, and difficulties to propagate high-frequency waves. In order to better characterize such shallow targets, one of the solutions is to take into account data from multi-component sources and receivers. In this study, we analyze the benefit of 3x3C seismic data: 3x3C seismic is an acquisition technique which contains three orthogonal directions of the source and three component receivers. Although 3x3C seismic is feasible in practice, the benefit of such data for FWI is still not clear. This research uses two different synthetic models to assess the interest of 3x3C seismic data through the construction and analysis of the sensitivity kernel of both P-wave and S-wave velocities for each wave type (P-wave, S-wave, and surface wave), and each component. The results show that 3x3C data provide complementary information on the kinematic, dynamic and polarization of the wave propagation, yielding a potentially better reconstruction of the subsurface properties.