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Stretching and Squeezing Logs

Stretch and squeeze a selected log portion in either time or depth using the Log Editor, which displays the log view in depth, or stretch it in time using the Correlation Window, which enables you to hover the log over seismic.

Stretch and squeeze functionality is also available when tying seismic to models or by specifying values when importing check shot surveys. For details, see Related Topics below.

To stretch and squeeze logs:

Open the log editor:

Edit > Log editing
Double click on a log in the model.
Right-click on a log and select Log editing.

Select the tab for the log to stretch or squeeze and in the Log Editor toolbar, click the Stretch Squeeze tool ().

The Stretch/squeeze log curves in time dialog box appears.

Select whether to stretch or squeeze the log in time or depth.
Do one of the following:

Drag the cursor () on the Log Editor log display pane to select a range to stretch or squeeze. The cursor position appears in the banner of the Log Editor.
Type values in the Set depth range KB pane for the start and stop depth and click Update.
Click either top or bottom to accept the absolute depth from the log or click All to accept both.
Click Depths from tops to display the Depth Range from Tops dialog box and then select the formation tops that signify your zone of interest from the drop-down lists and click OK.

Do one of the following:

If you selected depth above, type the desired thickness of the zone defined above after stretching or squeezing. If the value is less than the difference between the start and stop depth, the log will be squeezed. If more, the log will be stretched.
If you selected time above, type a value by which to adjust the transit times for the zone defined above and the number of samples over which to taper the change.

Click Apply.