How do I make an isochore or isochron map in Insight?
A simple horizon maths operation can be used to create an isochore or isochron map in Insight. An isochore map is the true vertical thickness between two horizons; an isochron map is the vertical time between two horizons. Both maps are created in a similar way. See Isopachs, Isochores, and Isochrons for more details and to create isopach (stratigraphic thickness) maps.
- Open Map View and begin a Horizon Maths operation (see Horizon Maths).
- At the Inputs section, input horizon 'h1' and 'h2'.
- For an isochore map, set the property as TVDSS (m).
- For an isochron map, set the property as TWT (ms).
- At Formula, insert the formula: h1 - h2. Make sure you are subtracting the shallower horizon from the deeper one.
- Select the output vertical dimension.
- For an isochore map, set the output property as TVDSS (m).
- For an isochron map, set the output property as TWT (ms).
Note: If you do not want the newly created horizon to show in section view, set the vertical dimension to <none>. Without the vertical dimension, you will only be able to view it in Map View.
- You can optionally constrain your isochore/isochron map by selecting a polygon for the ‘Area’.
- The output is a horizon property of vertical thickness (isochore) or time (isochron) between the input horizons. You can save this as a custom property to an existing horizon or create a new horizon.