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Compute Velocities

The Compute Velocities function is used to calculate average and interval velocity using either well time or seismic time for the computation. See average velocity definition and interval velocity definition.

• On the Applicationtoolbar select |Well Database.
• Highlight the wells which velocity is to be calculated. (Multi-selection of wells can be accomplished using the <Shift> and <Ctrl> keys).
• Select TOPS Functions | Compute Velocities. View image

Average Velocity

• In the TOPS Velocities box select to use either well time or seismic time for the computation.
• Remove the check mark from the Compute TOPS Interval Velocity box and click <OK>.

Average velocity will be calculated using the following equation:

When the Average Velocity calculation has been completed, a check mark will appear in the "TOPS Avg. Vel" column of the Well-spot database window.

Interval Velocity

1. In the TOPS Velocities box select to use either Well Time or Seismic Time for the computation.
2. Remove the check mark from the "Compute TOPS Average Velocity to Seismic Datum" box and click "OK".
3. In the Interval Velocity Computation box select one of the following options:
• Compute between consecutive horizons
• 
• Compute relative to a reference horizon

Interval velocity will be calculated using the following equation:

When the Interval Velocity calculation has been completed, a check mark will appear in the "TOPS Int. Vel" column of the Well-spot database window.

What do you want to do?

• Get an overview of working with tops
• Compute times for deviated wells