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Tomography

GX Technology supports both narrow azimuth (NAZ) and wide azimuth (WAZ) tomography with WAZ being a natural extension of NAZ tomography. GX Technology's WAZ tomography supports isotropic and anisotropic model parameter determination; specifically, for an anisotropic model, both VTI and TTI anisotropic models are supported.

Autopicking and Tomography

Tomography is driven by using auto-picked velocity error. Autopicking (APK) is used to automatically pick the residual moveout of events on the depth or time migrated gathers as a function of common depth point, offset, and depth (or time). This information is used as input to GXT's sophisticated tomography solution for direct inversion into an updated interval velocity model.

Better Geologic Understanding with GXT's WAZ Tomography

Our process is highly automated and iterative. The main difference between NAZ tomography and WAZ tomography is that the equation used to derive the velocity field updates is better constrained, measuring velocity error as a function of azimuth, thus allowing for more precise velocity determination. The key elements in this process are input gathers, gather parameterization, and topographic constraints.

The final outcome of this process is the most accurate and representative velocity model possible. This model, combined with our industry-leading RTM technology, provides a high-quality representation of the seismic section.