The Edit LAS curve tool applies processing and editing operations to individual log curves.

This is useful for cleaning, correcting, or customizing log data before interpretation or correlation.

To open the wizard, go to the Petrophysics ribbon tab and, in the Execute group, click Edit LAS curve.

The wizard consists of the following key areas:

1. Well and Curve Selection

At the top, select the target Well and the Curve (log) you wish to edit using the dropdown menus.

Enable Batch calculation to apply the same editing action to more than one well in a single run. The adjacent dropdown sets the scope of wells to process: besides All wells, it also lists the project's Filters, Folders and Well sections, so you can restrict the operation to a saved filter, a well folder or a well-section group. The Well and Curve dropdowns still choose which curve is edited in each well.

2. Depth Range

Select the depth range over which the operation will be applied. Options include:

• MD range: Measured Depth
• TVD range: True Vertical Depth
• TVDSS range: the vertical depth measured below mean sea level
• Markers range: Use tops/markers to define interval

On the MD range, TVD range, or TVDSS range tab, enable Start and/or End and enter the limiting depth values.

On the Markers range tab, enable Start and/or End and choose the corresponding marker. The example below applies Moving average filter between two selected markers.

3. Action – Log Editing Options

In this section, choose one of the available operations from the Action dropdown menu:

• Moving average filter: Smooths the log by averaging values within a specified window. Enter the window size in the current depth unit. The field is labelled Window (m) or Window (ft), depending on the measurement system.
• Median filter: Reduces noise by replacing each value with the median of its surrounding values within the defined window.
• Bandpass filter: Applies frequency-based filtering to isolate or remove specific ranges in the data.
• Depth shift: Shifts the entire curve vertically by a fixed amount. Useful for aligning logs when depth mismatches occur (e.g., from tool calibration errors).
• Expression: Calculates new values for the selected curve from an expression. Enter the formula directly or click the calculator icon to build it from the available curves, operators and functions.

The Expression action edits the selected curve in place. Enter only the expression, for example GR/180; do not add a name = prefix. If you include a prefix in the Log calculator opened from the calculator icon, g-Space asks you to remove it. You can reference the selected curve by its displayed name or by value. Curve names such as SP and SP1 are treated as separate identifiers.

4. History Panel

The History tab lists the actions run during the current editing session. Use Undo to remove the most recent action.

5. Buttons

• Save to workflow: Adds the configured edit as a workflow task.
• Run: Applies the selected action and adds it to History while keeping the wizard open.
• Undo: Removes the most recently run action and restores the previous edit state.
• Save: Saves the accumulated edits and closes the wizard. In the overwrite prompt, choose Yes to replace existing values, No to enter new curve names and keep the originals, or Cancel to return without saving. When you choose No and save new curve names, the new curves are added to the Data Manager and displayed immediately in the same Well correlation view track or tracks as their originals. They inherit the originals' display settings and use a contrasting color.
• Close: Closes the wizard. If the History contains unsaved actions, confirm whether to discard them.

Deleting a single curve

To delete one log curve without affecting the rest of the LAS, right-click that curve in the Data Manager (in the well's log list or under All curves) and choose Remove. g-Space asks for confirmation (Do you want to remove selected las curves?) and then removes only the selected curve, leaving the other curves in the file unchanged.