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CycloLog Version 2012 Tutorial Manual – Part 2
Version 2012
Tutorial Manual
Part 2
Importing and displaying data
Includes following topics:
1. Conversion of LAS file to CLG
2. Managing and displaying the various log curves
3. Importing additional wells into a CycloLog project file
Copyright
The CycloLog® Software and all accompanying documents are patented and copyrighted with all rights
reserved by ENRES Energy Resources International B.V. The Software and documentation may not be given or
sold except by ENRES Energy Resources International B.V. and its designated suppliers. Unauthorised copying,
duplicating, selling or otherwise distributing the Software or documentation is a violation of the Copyright Law.
CycloLog Patents Nr. 1015928 Netherlands, Nr. 1-182466 Europe
CycloLog is a registered trademark of ENRES Energy Resources International BV
INPEFA is a registered trademark of ENRES Energy Resources International BV
ENRES is a registered trademark of ENRES Energy Resources International BV
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CycloLog Version 2012 Tutorial Manual – Part 2
LAS Import
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Select File menu → New, then click on the New tab.
Select LAS file.
Navigate to the file to be used and click Open.
The file will be read into CycloLog.
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CycloLog Version 2012 Tutorial Manual – Part 2
 In the General Parameters dialogue box (User Settings area), enter the
required depth interval (Start and End depths), and the Units to be used
(Feet or Metres).
 Leave the Step value unless there is good reason to change it.
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CycloLog Version 2012 Tutorial Manual – Part 2
 In the Available Logs dialogue box, select the required logs or press
Select All for all logs.
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CycloLog Version 2012 Tutorial Manual – Part 2
 In the Log Order dialogue box, use the Up and Down arrows to change
the order of the logs, if required. (Suggestion: put the GR log at the top
of the list.)
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CycloLog Version 2012 Tutorial Manual – Part 2
 In the Log Data dialogue box, the data can be viewed.
 To use this box to change null values (-999.250000) to zeroes
(recommended), click the Change Values button and then the Change
button on the Change Values dialogue box that follows.
 Click Close, check that the null values have changed to zeroes, then click
Next.
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CycloLog Version 2012 Tutorial Manual – Part 2
Depth Correction
 If the well is vertical, click Finish.
 If deviated, or to apply a subsea depth correction, check Apply depth
correction.
 MD-TVD depth pairs can be entered by hand or via a deviation survey
file (click Import → Plain File or LAS File and navigate to the file): consult
CycloLog’s Help if necessary.
 An alternative is to copy the MD-TVD pairs from another file (e.g.
spreadsheet), and use the Import → File → Clipboard option.
 Click Finish. Click the Save icon (or CTRL + S) to save and name the file
(****.clg).
 Note that CycloLog can only import LAS File deviation data that were
exported out of Petrel (i.e. the LAS file is a Petrel-based format).
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CycloLog Version 2012 Tutorial Manual – Part 2
Managing log curves
 When a well has been entered, the well and its logs will appear in the
Workspace.
 Re-order logs in the Workspace by clicking and dragging them up or
down the list.
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CycloLog Version 2012 Tutorial Manual – Part 2
Displaying log curves
 Double-click over a log to display it; right-click over a log for other
options.
 Use the Vertical scale option on the Standard Toolbar to change the
vertical scale; the new scale will apply to all displayed logs from the
same well.
 Put the cursor on the depth bar of the log pane to change the vertical
scale manually. Hold down the left mouse button pane and then move
up or down to increase/decrease the vertical scale.
 Use the icons on the Log Toolbar to change the appearance of a log:
wiggle/mirror plot, horizontal scaling, wiggle colour, wiggle thickness
and style, and colour fill.
 These and other options are accessed by right-clicking over the log pane.
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For reference, the ENRES conventions for displaying some common logs are as follows:
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GR log: wiggle colour = black; horizontal scale 0 – 200 API.
DT log: wiggle colour = red; horizontal scale 140 – 40 μs/ft.
RHOB log: wiggle colour = blue; horizontal scale 1.95 – 2.95.
NPHI log: wiggle colour = brown; horizontal scale 0.45 – -0.15 (or 45.0 – -15.0).
Deep resistivity: wiggle colour = orange; horizontal scale logarithmic, 0.2 – 2000.
Shallow resistivity: wiggle colour = green; horizontal scale logarithmic, 0.2 – 2000.
The following shows the GR curve in three different display formats: mirrorplot, cut-off toning (toning applied at values > 75 API units), and colourclassified.
 The classified plot, useful for suggesting lithology, divides the range of
values into equal intervals, which are coloured from red (low values) to
blue (high values).
 All three display types can be accessed from the right-click menu.
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CycloLog Version 2012 Tutorial Manual – Part 2
Overlaying log curves
 To overlay logs (e.g. neutron and density), go to the View menu and
select Log overlay.
 From the list, select the logs to be overlaid and click View.
 In a pane that displays overlaid logs, change the properties of individual
logs by activating the pane, then select the log from the drop-down list
on the Log Toolbar, or right-click on the pane and select Wiggle
Properties.
 Note that the overlaid curves cannot be saved in the workspace. See
Part 4 for displaying log overlays in the Composite Well Chart.
The example below shows the RHOB and NPHI logs separately, and overlaid.
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CycloLog Version 2012 Tutorial Manual – Part 2
Importing additional wells and/or logs
A CycloLog (*.clg) file is a project file which can hold more than one well.
 Wells can be added to the project either from another LAS file, or from
an existing .clg file.
 To add a well, select File menu → Import and select LAS file or CLG file.
 If from a LAS file, use the LAS Import procedure above.
 Either way, the new wells and their logs will be added to the Workspace
list.
Logs can be added to an existing well:
 Go to File menu → Import;
 Select Log from LAS file.
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