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Note: This module is deprecated. It is retained for compatibility with existing workflows. For new projects use the dedicated velocity conversion modules available in the Velocity group.
This module converts a velocity model from one type to another using a user-selected processing method. The following conversions are supported: interval velocity in time to interval velocity in depth (VINT Time 2 Depth); interval velocity in depth back to time (VINT Depth 2 Time); interval velocity in time to RMS velocity via the Dix formula (VINT Time 2 RMS); interval velocity in time to average velocity in time (VINT Time 2 VAVG Time); and average velocity in time back to interval velocity in time (VAVG Time 2 VINT Time).
The input velocity model to be converted. The expected domain and velocity type must match the selected Processing method. For example, if converting VINT Time 2 Depth the input must be a time-domain interval velocity model.
The number of samples in the output velocity model. The default is 2000. Set this so that the output time length (= Number of output samples × dt) or depth extent (= Number of output samples × Step z) covers the full range of interest.
The time sample interval (s) of the output time-domain velocity model. The default is 0.004 s (4 ms). This parameter is used for conversions that produce a time-domain output (such as VINT Time 2 RMS or VINT Depth 2 Time). Match this to the sample rate of the seismic data.
The depth sample interval (m) of the output depth-domain velocity model. The default is 5 m. This parameter is used for conversions that produce a depth-domain output (VINT Time 2 Depth). Smaller values produce finer depth resolution but increase the output model size.
Selects the type of velocity conversion to apply. Options:
VINT Time 2 RMS (default) — converts a time-domain interval velocity model to an RMS velocity model using the Dix formula.
VINT Time 2 Depth — converts a time-domain interval velocity model to a depth-domain interval velocity model using ray-stretching. The Replacement Velocity is used where the input interval velocity is below the minimum threshold.
VINT Depth 2 Time — converts a depth-domain interval velocity model back to the time domain.
VINT Time 2 VAVG Time — converts a time-domain interval velocity to a time-domain average velocity.
VAVG Time 2 VINT Time — converts a time-domain average velocity back to a time-domain interval velocity.
The velocity (m/s) substituted for the interval velocity in the shallow section when converting from time to depth, specifically in zones where the velocity is below the physically meaningful minimum. The default is 1500 m/s. This is relevant only for the VINT Time 2 Depth processing method.