| Function type | Depth is a function of time (this is an interval velocity function – not an instantaneous velocity function). |
| Definition of parameters |
V0 = constant velocity factor. Z0 = depth factor. T = bottom seismic time of the layer. |
| Operational applications |
Can also be read as Z=V0 × T + Z0; useful when the depth of the given horizon appears as a simple linear transformation of seismic time. This is a simple model which can be used for reference or large scale basin study. |
$$
V_{int}= V0 + \frac{Z0}{DT}
$$
$$
DZ = V_{int} \times DT = \left( V0 + \frac{Z0}{DT} \right) \times DT
$$
$$
DZ = V0 \times DT + Z0
$$