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1. In the Seismic interpretation toolbar tab > Seismic-well calibration group > click on the Seismic well tie button (Figure 1).

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Figure 1: Petrel Seismic well tie button.

2. In the Seismic well tie dialog box that appears, select Sonic calibration from the Study type dropdown list. Select the well or borehole to use (Figure 2).

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Figure 2: Seismic well tie window configured for creating a new sonic calibration study.

3. For the template, select the default sonic calibration template (Figure 2).

Select the parameters in the various tabs at the lower half of the dialogue box. Contextual help or brief description of each parameter is shown if the cursor is moved over the corresponding blue button Image Added

4.  Input

In the input tab, select a delta-t or velocity data, preferably one that has been despiked (conditionedconditioned (e.g., despike) of outliers. The initial TDR can also be a velocity data (stacking, wireline, or laboratory/core) (Figure 2).

5. Output

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Figure 3: Output tab for seismic well tie window.

6. Datuming

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Figure 4: Datuming tab for seismic well tie window, with the different parameters that define a marine datum.

7. Time-depth

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Figure 5: Time-depth tab for seismic well tie window.

8. Options

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Figure 6: Options tab for the seismic well tie window.

9.  When you are satisfied with the parameters, click OK.  A well section window will appear showing the results of the calibration process.

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Figure 7: Initial result of the sonic calibration displayed in a well section window.

10. Once the initial sonic calibration output is created, the knee curve can be edited so that the knees can coincide with the checkshot points or to additional locations such as defined well tops. To do this, open the Well tie editing tool palette from Seismic interpretation > Seismic-well calibration group > Well tie editing.

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Figure 8: Well tie editing tool palette.

Click on the "Knees at checkshots" button (first row, second from the left button).  This will create knees at every checkshot points, as shown below:

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Figure 9: Well section window for sonic calibration with knees at every checkpoint.

11. Save TDR and apply to well.

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