About depth models

A depth model consists of a minimum of two zones, which are closed polygons. You generate zones by either drawing correlations with your mouse, or by using the Create Well Correlations dialog box.

Zones encapsulate velocity fields, which may be generated by interpolating or extrapolating impedance data from wells that intercept a zone, or with a constant impedance value you define. Once zones are created, you can view the resulting time model. You modify zones, correlation nodes, and log readings on the depth page to influence the time model.

Any number of logs can be included in a model, but GeoSyn only uses a single sonic and a single density from each well to create the time model. These logs are called the active sonic and active density. You can select any two logs in each well as active, which enables you to quickly shift between logs that represent different geological scenarios.