Basin-wide Velocity Model Building

The workflow utilises all available velocity data within an area to create a regionally consistent velocity model suitable for depth conversion.

Inputs include marine and/or land 2D and 3D seismic velocities and well-based velocities (such as checkshot surveys or velocity logs). The workflow solves the problems of velocity mismatches at line intersections within 2D surveys and of combining surveys of differing vintages. As a result of variations in acquisition parameters and processing flows overlapping surveys will often show velocity mismatches. These discrepancies are reconciled using DUG's Intra-levelling and Inter-levelling workflows. Regional horizons are used to incorporate structural and stratigraphic constraints into the workflow.

DUG's Geostatistical Velocity Model Scaling workflow calibrates the regional velocity model to wells, resulting in a final product that can be used for a range of purposes. These include depth conversion of seismic data and horizons, initial input to velocity model building workflows, and quantitative interpretation applications, such as low-frequency model building and pore pressure prediction.