Adaptive Tomographic 3D MAZ PSDM Velocity Modeling with Tilted Orthorhombic Anisotropy. Example From NW Australian Shelf

We use real data examples from 4060 km2 3D Multi-Azimuth (MAZ) PSDM Fortuna project located in the Northwest Australian shelf to present a workflow for 3D MAZ velocity modeling with tilted orthorhombic anisotropy. In this paper we focus on two aspects of depth-velocity model building that are extremely important for seismic data from the North-West Australian shelf: (1) high resolution adaptive seismic tomography to deal with strong velocity anomalies in complex geological settings and (2) practical workflow to build a tilted orthorhombic anisotropic PSDM velocity model in regions with complex velocity anomalies and strong horizontal and vertical anisotropy.

As seismic reflection tomography remains an important tool to build large scale depth-velocity models in seismic imaging, we discuss how an adaptive data driven approach to running tomography helps to provide accurate and robust velocity models in complex geological settings.