Evaluation of anisotropic parameters using virtual cross-dipole data with full waveform approach

Abstract

Subsurface stress field induces S-wave anisotropy. This information contributes to efficient well designing and drilling plan. So, subsurface S-wave anisotropic information is quite significant for the future natural earth resource development. In spite of the importance of S-wave information, S-wave survey is quite difficult to conduct in offshore field because of water shear modulus. In the previous study, we constructed a novel offshore S-wave survey scheme with interferometric approach and estimated S-wave anisotropic orientation angle even in offshore cases with high accuracy. On the other hand, some limitations on its applicability to complex geological structure have been indicated. In the present study, we propose a new estimation scheme combining seismic interferometry and full waveform inversion. We conduct three types of numerical experiment for feasibility test. The results for each test show sufficient accuracy and, become the proof of concept.