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Gridding and surface modeling.

Grid models are essential in modeling reservoirs. Good grid models require good input and well tuned algorithms.

In this exercise we will use as input seismic interpretation lines and closed stick faults. There are seven interpretation sets including the seabed. The reservoir has six horizons. The bottom four have fault lines as input while the top two don't use any faults.

Exercise

Grid a time surface from seismic interpretation and no faults.

  1. Display interpretation lines from 02_Time data > Interpretation lines > 02BasePliocene.
  2. Apply the command Simple points and lines gridding
  3. Click Update window to get the project window as the grid window.
  4. Set x and y increment to 500.

    Grid window for Course B1

    • xmin = -188000, xmax = -47500; ymin = 7864500, ymax = 7959000
    • Using grid increment 500 this gives: number in rows: 282 , number in columns: 190
  5. Use gridding algorithm Parabolic (default).
  6. Check in for *Use two steps gridding". Grid increment will be automatic calculated if blank.
  7. Set moving average as gridding algorithm for 1. step.
  8. Click Execute. The result will be written to the same folder.
  9. Create a new folder for interpretation grids and cut/paste the result grid into this folder.


Seismic 2D sections and navigation lines


Detail of seismic and interpretatin lines

Exercise

Grid a time surface from seismic interpretation and closed stick faults.

  1. Display 02_Time data > Faults > 07SilurianFaultInt_Polygons. This is how the fault polygons comes from Kingdom. They must be edited.
  2. Use Edit points and lines to remove the blobs. See Case study - Gridding of seismic interpretation data with faults.
  3. The correct edited fault lines are in 02_Time data > Faults > CorrectedClosedFaults. Use this if you don't have time to complete the editing.

    Tips when editing fault lines with _blobs_

    • To remove the blobs just delete the two extra points in the blobs.
  4. Apply the command Gridding > Gridding points, lines and faults.


Seismic 2D sections and navigation lines


Detail of seismic and interpretatin lines

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