How do I gain a volume between two horizons, using a spatially varying multiplier?
In this workflow, we apply a gain to the values of a volume between two horizons. The amount of gain applied is defined by a third horizon.
It requires the following items loaded in the session:
- The volume to scale
- An upper bounding horizon
- A lower bounding horizon
- A horizon containing scalar (gain) values
- Create a Volume Maths process.
- Click the Volume (+) and select the volume to scale. Use the default variable name, “v1”.
- This example uses a volume called “Velocity_tie_to_wells”.
- Click the Horizons (+) three times to and add three horizons:
- h1: choose the upper-bound horizon.
- h2: choose the lower-bound horizon.
- h3: choose the is the horizon (grid) based scale factor.
- Use the formula:
if (twt_ms > h1 && twt_ms< h2, (v1*h3), v1)
- The result of this process is a new volume, located in the Volume tab. Note: Use the CTRL-P hotkey to quickly switch between a process and its result volume.
- Go to View > New IL/CL View or 3D View to QC the result.