Advancements in marine seismic acquisition facilitate recording of vector-acoustic data, comprised of both the pressure and particle velocity wavefields. Having access to additional components of the seismic wavefield can aid efforts to image the subsurface. In order to utilize this extra information, we propose applying the adjoint state method to the vector-acoustic data to constrain the subsurface models. Gradient constructed by the adjoint state method are used to invert for the subsurface model parameters. The process of constructing gradients and inverting for the model parameters requires expensive wavefield computations. Much of these computations are wasted on wavefield propagation through regions of the model that do not change when the anomaly is localized to a small region of interest, such as in timelapse applications. Since the anomaly is small and spatially constrained, we implement the method of multiple point sources to localize the gradient calculation and inversion to the region of interest. Localization of the wavefields constricts the simulation to the domain of interest, speeding up the calculation of the gradient and inversion.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 3:55 PM
Location: Poster Station 10
Presentation Type: Poster