Calculating Well Marker-Horizon Mistie

Use this workflow to determine the well marker and horizon intersection depths at a specified well marker location and use these to calculate a residual map.

  1. Open a text editor and create a column of well ID besides the well marker X/Y locations.
  2. Save this file as a .dat file.
  3. Open Insight and import them as horizons (see Using the horizon text importer).
  1. In the Import window, set the X,Y values in their respective columns.
  2. Set the well ID as “Extra Attribute”
  3. Click OK to continue importing.
  4. Go to Control Panel > Map View.
  1. Display the imported horizon in the map view
  2. Click the Operations tab and select the Regrid Operation to regrid the imported XY  well locations to the 3D Survey (ILCL) (see Regrid Horizon)
  3. Click Regrid.
  4. Save as a new horizon (ILCL).
  1. Go to the Operations tab and select Horizon Maths operation.
  2. Click the blue "+" button and add two symbols:
    •   h1:  Imported well list
    •   h2:  Depth converted horizon
  3. In the formula field, use: (h1*0)+h2.
  4. Click Run.
  5. Click the Add property button, select the correct horizon  and type a property name.
  6. Click OK.
  1. Enable the wells in the Control Panel > Wells tab.
  2. Click the Operations tab and select Create Horizon from Well Markers operation.
  3. Select the Marker name.
  4. Select a polygon that includes the wells of interest.
  5. Click Run.
  6. Click the Create New button, rename the horizon appropriately.
  1. Go to the Operations tab and select Horizon Maths operation.
  2. Click the blue "+" button to add two symbols:
    •   h1:  Imported well list
    •   h2:  WellMarkers horizon
  3. In the formula field, use: (h1 * 0)+h2
  4. Click Run.
  5. Click the Add property button, select the correct horizon  and type a property name.
  6. Click OK.

Calculate the Residual Mistie

  1. Go to the Operations tab and select Horizon Maths operation.
  2. Click the blue "+" button and add two symbols:
    •   h1:  Depth horizon sampled at well list
    •   h2:  WellMarkers horizon sampled at well list
  3. In the formula field, use: (h1 - h2)
  4. Click Run.
  5. Click the Add property button, select the correct horizon  and type a property name.
  6. Click OK.

Results 1: Export Residual Mistie

  1. Export the horizon as a customise text file from the control panel (see export customised text file).
  2. Select all the attributes of interest.
  3. Click OK to export these attributes.

Results 2: Map Residual Mistie

Horizon regrid and interpolate / extrapolate operates on the fundamental values from the horizon.

  • For a TWT horizon, they use the TWT values, a depth horizon will use TVD, and so on.

To create separate horizons that are distinct from the custom attribute horizon, use Horizon Math:

  1. Go to Map View > Operations > Horizon Math.
  2. Click the blue (+) and add your custom attribute horizon.
  3. Choose the Property to use (e.g. Residual Mistie).
  4. Use formula: h1 (or whatever symbol you've chosen).
  5. Click Run.
  6. Click Create New to save as a new horizon.
  1. Select the new TVDSS horizon.
  2. Select Operations > Interpolate/Extrapolate.
  3. Click Interpolate.
  4. Save as new horizon.