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Estimation of Azimuthal Angle of Shear Wave Anisotropy by Utilizing the Virtual Source Method with an OBS
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
In this study we propose a novel scheme to estimate shear wave anisotropic parameter using the virtual source method applied to a dataset acquired by a single ocean bottom seismometer for a line of air-gun shots beneath the sea surface. For the evaluation of the effectiveness of our method, we conduct numerical experiments for a 3D multi anisotropic layer model. We employ the virtual source method to the synthetic seismic data to generate cross-dipole data virtually acquired at every shot location. Finally we apply the layer stripping method to the virtual cross-dipole data to estimate an azimuthal angle of the anisotropy for each layer of the sub-seafloor structure below each air-gun location as a function of depth. Our results indicate that the orientation and the order of shear wave velocity anisotropy could be estimated for the usage of a monopole source without touching down the seafloor in the marine environment.