Refraction Statics via Delay Time
TGS uses the Flatirons 3rd party software for computing refraction solutions based on the delay-time methodology
In this approach observed first breaks are fit to a travel time equation which includes three terms: a source delay time, a receiver delay time and a linear moveout term.
While the theory surrounding the approach is well-known (Barry, 1967), the Flatirons software contains several novel QC tools, including a powerful iterative approach for picking difficult first breaks, a sophisticated GUI for specifying spatially-variable refractor branch points, and also the ability to constrain the final earth model to exhibit either a flat base-of-model or a uniform overburden (weathering velocity).
Figure 1: Brute stack with GLI statics solution
Figure 2: Brute stack with Delay Time static solution.