Scale Curves is a tool for upscaling (blocking) LAS well-log curves along the well trajectory. It resamples a high-resolution log into coarser cells - either following the layering of an existing 3D grid or using a fixed scale interval you define - and writes the result back as a new curve on the selected well(s). The upscaled curves are typically used to condition property modeling and to compare log data with grid-cell resolution.

Purpose

The tool is designed for:

• Blocking (upscaling) LAS curves from sample resolution to grid-cell or interval resolution
• Preparing well-log data for use in property modeling and geostatistics
• Averaging a log over regular depth intervals along the borehole path
• Reconciling log resolution with the vertical cell size of a 3D grid

Requirements

• At least one well with loaded log curves (LAS files / curves) in the Wells folder of the Data Manager
• Valid deviation / inclinometry data on the well when the TVD sampling direction is used
• For the Using a Grid method - at least one 3D grid available in the project

Launching the Wizard

In the Data Manager, right-click the Wells folder and choose Scale curves from the context menu. The Scale curves dialog opens.

[image: placeholder_Data_Manager_context_menu_on_the_Wells_f.png]

The dialog is split into two areas: a controls panel on the left (well, curve, depth interval, scaling method and output options) and an Input/Output preview panel on the right that plots the source curve against the scaled result.

[image: placeholder_Scale_curves_wizard_dialog_showing_the_l.png]

Step-by-Step Guide

Configure the controls in the left panel from top to bottom, then generate the scaled curve.

Selecting the Well and Curve

• Well: choose the well whose log will be upscaled.
• Batch - enable this checkbox and use the adjacent dropdown to apply the same settings to a group of wells (for example, all wells) in a single run, instead of processing one well at a time.
• Curve: select the log curve to upscale. The dropdown lists the curves available on the selected well.

Setting the Depth Interval

The depth-range widget limits the portion of the log that is processed. It offers MD range, TVD range, TVDSS range and Markers range tabs, each with Start and End fields. By default the full depth range of the selected well is used; leave the fields empty (Undefined) to keep the full range, or enter values to restrict processing to an interval.

Choosing the Scaling Method

The Method group offers two ways to define the cells that the curve is averaged into. Select one of the two radio buttons; the settings below the buttons change accordingly.

Using a Grid (default)

With Using a Grid selected (the default method), the curve is upscaled along the well trajectory using the cell layering of an existing 3D grid. Each segment of the trajectory that passes through a grid cell defines one averaging interval, so the scaled curve matches the vertical resolution of that grid.

• Grid: choose the 3D grid whose cells drive the upscaling. The dropdown lists all grids available in the project.

Create New Scaling

With Create New Scaling selected, the curve is blocked into regular intervals of a size you define, independent of any grid. Use this method when no suitable grid exists or when you want a fixed sampling step.

• Scale interval (shown with the current depth unit, m or ft): the cell size of the new scaling - for example 5 or 10. The default is 10. The curve is averaged over successive intervals of this length along the trajectory.

Sampling Direction

The Sampling direction dropdown controls how depth intervals are measured when averaging the log:

• Along trajectory (default) - intervals are measured along the borehole path (measured depth), following the well deviation.
• TVD - intervals are measured in true vertical depth. This option is available only when the well has valid deviation / inclinometry data and the chosen depth range maps to a finite TVD range; otherwise it is disabled and the tool falls back to Along trajectory.

Averaging Method

The Averaging dropdown defines how the log samples inside each cell are combined into a single value:

• Most Common (default) - the most frequent value; suited to categorical / discrete logs (for example facies).
• Average - the arithmetic mean of the samples.
• RMS - the root-mean-square value.
• Median - the middle value, less sensitive to outliers.
• Minimum - the lowest sample value in the cell.
• Maximum - the highest sample value in the cell.

Output Suffix and Preview

In the Suffix field, set the text appended to the source curve name to build the name of the new upscaled curve. The default suffix is _new; edit it as needed. If the suffix is left empty, the source curve is overwritten with the upscaled version and the tool asks you to confirm.

Press Apply to compute a preview: the source log appears in the Input plot and the blocked result in the Output plot of the Input/Output panel. Adjust the settings and re-apply until the result is satisfactory. Apply only previews - it does not save the curve.

Saving the Results

Press Save to write the upscaled curve. The new curve is named <curve><suffix> and is added back to the selected well(s) in the Data Manager. If a curve with the same name already exists, the tool asks whether to overwrite it. When Batch is enabled, the curve is generated for every well in the batch selection.

Use Save to workflow instead to store the current settings as a reusable step in the processing workflow rather than running the operation immediately. Close dismisses the dialog.

[image: placeholder_Data_Manager_showing_the_newly_created_u.png]

Results

• A new upscaled (blocked) curve, named after the source curve plus the Suffix, stored on each processed well.
• The curve is available in the Wells folder and in the well-log displays of the Well-data-workspace.
• The upscaled curve can be used directly as input for property modeling and geostatistical workflows.

Recommendations

• Match the scale to your target grid: use Using a Grid when the upscaled logs will condition properties of that grid, so the log and cell resolutions agree.
• Choose the averaging method to fit the log type - use Most Common for categorical logs (facies, lithology) and Average, RMS or Median for continuous petrophysical logs.
• Preview with Apply before saving to confirm the blocked curve honours the trend of the source log.
• Keep a non-empty Suffix to preserve the original high-resolution curve alongside the upscaled version.
• Use TVD sampling for strongly deviated wells when the target intervals are defined vertically; keep Along trajectory for measured-depth workflows.
• For the reverse operation - populating a well log from a 3D grid property - use the Extract Grid Property to LAS command available on a grid property in the Data Manager.

See Also

• Wells
• Wells data workspace
• Import LAS files
• Well log calculator
• Properties modeling
• Seismic Data Upscaling