Borehole acoustic full-waveform inversion

Full-waveform inversion (FWI) is a technique that has the potential for building high-resolution elastic velocity models. We apply this to wireline monopole acoustic logging data image near-wellbore formation structures, which can be used in fluid intrusion evaluation. Our FWI workflow established cylindrical coordinates instead of Cartesian adapt borehole geometry. Assuming tool centralized and properties are azimuthally invariant, we simplify problem two dimensions inversion. Synthetic tests find P- S-wave model around could successfully inverted using once reasonable starting given. However, differs from seismic strong borehole-guided waves exist near wall due effects. The have little sensitivity away wall. In addition, it difficult simultaneously match waveform body guided synthetic field data. Therefore, applications, propose obtain structures by only first arrived P waves. proposed method applicable inverting P-wave structure with similar resolution compared ray-tracing tomography. may achieve higher applications future better assumptions made forward modeling more information