Joint inversion of marine MT and wide aperture seismic data using a 'hybrid'-based approach

摘要

We present a 'hybrid'-based workflow for the joint inversion of marine Magnetotelluric (MT) and wide aperture seismic data that reconstructs the velocities, resistivities and shapes within regions of interest (ROI) using an 'image'-based inversion approach followed by a 'structure'-based inversion algorithm where the ROI are parameterized using both surfaces and bodies for localized targeting and rapid inversion. This workflow preserves the velocity and resistivity structure already arrived at, enabling the integration of geology in the geophysical process. The 'structure'-based inversion allows for: faster velocities and resistivities model building, targeting salt bodies, focusing on geobodies. We show that the reconstructed velocities, resistivities and shapes of ROI are consistent with both the MT and the seismic data and that considerable improvement in resolution and speed is achieved compared to the current state-of-the-art. We illustrate the advantages and drawbacks of the 'hybrid' inversion using synthetic data.