Correctly injecting recorded multicomponent seismic data to generate receiver-side wavefield is a major step in elastic reverse time migration (RTM). In land reflection survey, the data are often recorded at the free surface where the traction free condition is naturally maintained. Based on the representation theorem, we propose a numerical appsoach to inject receiver-side signals from a free surface to reconstruct the receive-side wavefield. By injecting the traction-free time-reversed multicomponent seismic records from the surface, the method can generate correct down-going wavefields, which can further be used in the elastic RTM. Numerical examples are used to validate the injection and wavefield reconstruction procedure. Synthetic dataset is calculated in a model with a free surface boundary condition, and then re-injected to the model with a traction-free boundary condition. The reconstructed wavefields are carefully compared to the original forward propagated waves to evaluate the accuracy of the boundary treatment. By combining the regenerated receiver-side wavefield, the source-side wavefield and a vectorized image condition, we also tested the multicomponent elastic RTM. The PP, PS, SP and SS images are calculated.
Presentation Date: Monday, October 12, 2020
Session Start Time: 1:50 PM
Presentation Time: 1:50 PM
Location: Poster Station 7
Presentation Type: Poster
