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Introduction

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Procedure

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

Figure 1: Petrel Seismic well tie button


2. In the window that appears, select Synthetic generation as the Study type, and the name of the well or hole (Figure 2).

In the Input tab: 

          a) Select a new TDR or use the one currently applied for the well.

          b) Choose a wavelet to be convolved with the reflection coefficient, or create a new one by clicking the button to the right of the dropdown box. 

          c) Identify the seismic profile associated with the well being studied.

          d) For calculating the Reflectivity coefficient, the Sonic velocity and density method is often used. Select the logs to be used from the dropdown list, preferably those that have been conditioned and calibrated, especially for the sonic log.

          e) Expand the Advanced settings. In cases where the input logs have different depth coverage, there is the option to use only one log by applying the Gardner's equation to generate a synthetic seismogram in the segment that would otherwise be missing.


Figure 2: Seismic well tie window configured for generating a new synthetic seismogram.


3. The Output tab, provides the option to save the results of the analysis (Figure 3). Modify or append the default filenames in order to differentiate them from similar logs generated, especially for the TDR (Figure 3).


Figure 3: Output tab for the seismic well tie window.

4. Click the Apply button to generate a Well section window displaying the initial synthetic seismogram that is generated (Figure 4).

Figure 4: Synthetic seismogram well section window.

5. Refine the resulting synthetic seismogram.

Move the cursor over the Cross-correlation track and a read out will appear just below the track/column header indicating the Current position and the Max correlation that can be achieved with the suggested bulk shift to be applied. Take note of these values. The phase shift can later also be included once the phase mistie is computed (see below). 

Back in the Seismic well tie window, the remaining tabs for refining the synthetic seismogram are activated.


6. 











Credits

This guide is largely derived from the Petrel 2017 Geophysics training manual:

Schlumberger Limited (2018) Petrel 2017 : Petrel Geophysics Workflow/Solutions Training. Houston: Schlumberger, 764 pp.

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