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You are here: Working with the Application Toolbar > Import Data > Import Velocity Model Files

Importing Velocity Model Files (.AVFs)

You can import stacking velocities ( RMS), interval velocities, or average velocities into ProductName. These velocity files are generated from the Landmark TDQ module and usually have an AVF extension. (AVF stands for ASCII Velocity File). Most processing software and processors, can provide you with velocity data in this format.

The velocity file is made up of time depth pairs. The datum is assumed to be the seismic datum of your project. See a Sample AVF File

About the import process

During the import process, velocities from the ASCII file are projected to the nearest seismic trace. These velocities are interpolated for the times of each of the selected horizons, and stored to a new horizon. The new horizon has the time of the original horizon. The velocity is stored in the amplitude portion of the pick database. The new horizon has the name of the original horizon with a _V appended.

Import velocity model files (.AVFs)

Follow these steps:

  1. From the Application toolbar select | Import Velocity Model Files (.AVF).
  2. Browse for, and select your input file.
  3. In the Compute Horizon Velocity dialog box select the 2D lines and/or 3D areas you wish it import velocity information to.
  4. Set the Max. Velocity Proj. Dist. to control how far ProductName is permitted to project velocities.
  5. Select the horizons you would like to populate with velocities.
  6. Specify average or interval velocities.
  7. Specify Output Velocity Units as meters/sec or feet/sec.
  8. Click <OK>.
  9. Post your new horizon (old horizon name with _V or _V# appended) as amplitude.
  10. Grid your new horizon velocities by selecting Grid Amplitude.

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