How do I create a velocity gradient volume?

Follow the steps below to display the vertical gradient of a velocity volume at any point. Using the velocity gradient, large changes in the velocity can be easily seen.

1. Copy volume

1. Copy volume

To be able to display the velocity gradient, a duplicate of the velocity volume is required.

Follow the steps in Creating a Copy of a Volume to create a copy, export and configure the velocity volume.

2. Set bulk shift

2. Set bulk shift

After creating a copy of the velocity volume, shift the duplicate volume by the desired value, e.g. -100 ms (see Manual Mistie Corrections).

3. Volume math

3. Volume math

Create another Volume Maths process, and select the original and the duplicate volume. At Formula, type

v2-v1

where:

  • v2 = copied and shifted velocity
  • v1 = original velocity volume.

As a result of this process, a new volume is available in the Volume tab based on the Formula.

4. Viewing the gradient

At the navigation bar, select the Gradient volume.

The gradient can be displayed in 3D View, Map View, and any section views. Press F5 or F6 to make the colourbar hotter or colder respectively.