Cross section generally is a comparison of many log plot in a single viewer. It mostly used for correlation of zone penetrated by wells in order to understand the stratigraphic view of an oil and gas reservoir. So, to build a cross section, every well log plot must be generated. However, you don’t have to go to log plot panel since the cross section panel can handle everything by itself. However, some advance feature like editing zone and viewing data of log from log plot still unsupported in cross section panel.

Add New Plot
To create a plot in cross section panel, go to “Well Plot” tab in the left part of cross section panel and click button (+). The following dialog will be prompted. Fill up all properties of the plot i.e. the name to the plot (only used for identifier, no effect to plot), depth mode whether TVD or MD Select the well to be plotted and also its log data, lithology package, and completion package. You also have to select the template to be used for plot. To plot only a certain depth, check “Use Custom Depth” and fill out the top and bottom depth.

Edit Existing Plot
If you made a mistake when creating a plot, you still can edit the plot by clicking button (…) in the “Well Plot” Tab. A similar dialog will also be shown up. Edit it and click OK to update.

Changing Order of Plot
The order of plotting in cross section from left to right is determined by the order of plot name in the plot list. To move to the right, click button “Down” while move to left by clicking button “Up”.

Delete Existing Plot
To delete the existing plot, click button (x) and confirm the deletion dialog.

Select Zone to Show
Zone is one of the most important thing in cross section. To show or hide the zone, you can simply check or uncheck the zone list in the “Zone” tab.

Choose Flattening Mode
Flattening mode is very important in correlating plots. In most cases, using TVD mode and flatten to contact or a zone is recommended to compare the plot. However, LogView++ give you freedom to choose the flattening mode whether no flatten, use depth, or use zone. No flattening means every plot will be plotted as it is based on the data available in the plot (either las, lithology, its completion, or its custom depth). Flatten to depth means that t selected depth, the plot will be equal in position. While flatten to zone means that cross section will equalize all plot at selected zone in every well. In case of no zone available in a plot or well, the plot will be drawn from zero position at top of cross section position.

Use Global Setting
In case of you have created several plot in cross section but each plot have a different setting especially depth mode, Template, custom depth; you can force every plot to use a same setting using global setting. To do that, go to “Global Setting” panel and change the global depth mode, global template, and global custom depth. You can even change the scale of log by checking “Use Custom Scale” and fill the value of custom scale. After that click “update Plot” button in the right part of the cross section panel.

Changing Cross Section View
The plot can be modified by zooming.. Zooming in and out will only change the size of view, but not the bitmap of plot itself. So, just click button Zoom in or Zoom out in the right part of the cross section panel and everything should be done.

Exporting Cross Section
For further usage, some people probably need to make a screenshot of the plot to open it in a image viewer, or included it into a report file or something else. The easiest way to do that is by exporting the plot to a bitmap file. by clicking the button export plot you will be prompted with saving file dialog. Fill the file name and click ok.

Completion data is an important feature in logview especiallyfor plotting the well sketchi the logplot or cross section panel. Completion data usually consist of casing, tubing, packer, and etc. In most cases, an oil or gas well will encounter any of workover or well service during its life period. Therefore, there should be more than one of completion package available in a well. Deal with that fact, LogView++ have been utilized with a capability to handle multiple completion package. Ok.. so the first thing need to be done on managing completion data is creating the completion package.

Create New Completion Package
To create the package, it can be simply done by clicking menu “Completion Data” and select “New Package”. A dialog showing package name will be prompted. Click ok to create the package. After that, an empty completion package should now be exists in the selected well.

Add Tool to Package
Once completion package is ready, tool can be added to the package. Go to panel Completion Editor, and click button “New Tool”. A dialog of tool selection will be prompted. Select the tool category and its specification (size). Click ok to add the selected tool. After that, a new tool should now be listed in the completion tool table.

Edit Specific Tool in Package
Double click specific tool in table. Fill editable properties. Done

Delete Tool from Package
Deleting tool is an easy task. Just click button “Delete Tool” and its simply done.

Export Package
The easiest way to use the completionpackage to an external software or to be reimported to another logview project is by exporting it to an asci file. Go to menu bar “Completion Data”and select Export Package. A file saving dialog will be prompted. Fill the file name and select save. You should now have a text file filled with tab delimited data of completion tools.

Import Package
Importing is a backward step of exporting. It can also be simply done by selecting menu “Completion Data” and select Import Package. Browse the file and click ok. A completion parser dialog will be shown up. Select the delimiter, click Parse Table and select the appropriate column for tool name, depth start, depth end, and its tool type. Click next for final checking.

If every tool types are exists in the database, you can continue the wizard by clicking ok.. if not, you have to select the appropriate tool type in the database for each tool. Fill the incomplete data. Click OK and done.

Delete Package
To delete a completion package, go to main LogView++ project tree, right click a completion package and click delete. OK and done

Well top is a marker of zone that has been penetrated by well. In logview++, it will be plotted in log plot window and cross section window.

Create New Zone
Well top can be created by accessing menu zonation and click new zone. A dialog will be prompted. Fill all properties; zone name, line width, line type, and line color, and then click ok to continue. A new zone will now exists in the main LogView++ project tree. In the panel of zone editor, you will see a table with new zone name and well name.

Delete Zones
To delete a zone from project, Right Click Zone Name in the main project tree, and click Delete. Confirmation dialog will be shown up..

Edit Zones Properties
To edit the zone name, its line width, line style, and its color, right click zone name in the main project tree and click setting. An editing dialog will be prompted. Edit each property and click ok to update the property.

The most important property of well top is its depth position in every well. To edit it, go to panel zone editor and fill the depth in the table. In most cases, well top is recommended to be edited in TVD mode.. However, logview++ will save the MD data to make sure that a single depth especially for horizontal well that might have multiple TVD value for one value of MD. Consequently, if trajectory of the well is changed, the depth of TVD well top will be recalculated and overwritten.

!!!IMPORTANT!!!
Depth of -999.25 will be ignored. In case you really need that number, please give a bit change like -999.251.

Easier way to edit the depth of well top is by directly editing via log plot panel. By showing well top in log plot, at normal zoom mode, well top can be edited by dragging the well top (line) to a specific depth. By doing that, automatically the depth will be changed and the table of zone editor will also be refreshed.

It must be noted that LogView++ support only one depth data of each well for every well top. Therefore, in case of there is a fault penetrated by well that causes multiple depth of a well top in a single well, I recommend you to create a new different zone as a twin zone.

Import Zones
In case of you have a well top data, you can create a well top file in a text editor with format: WellTopName1, Depth@well1, Depth@well2, Depth@wellx, etc..

Example:
#WELLTOPS, WellName1, WellName2
NewZone1, 784, 778
NewZone2, 800, 798
NewZone3, 810, 806
NewZone4, 825, 831


That formatted file can be directly imported to LogView++ thru menu Zonation and click import well top. A wizard dialog will be shown up. Browse the file, select the appropriate delimiter and the start line of the data and click Parse Table. After that, select the column of depth data for each existing well in the project. If the file doesn’t cover the depth data of a specific well, let it as default (0) which means to be ignored. You can also choose whether non-existing well top will be created or not. After click ok, a bunch of zone and its data should now be ready in the project.

Export Zones
Exporting well top is an easy way to create a delimited text file of the well top data. The format of generated file is similar to imported well top data file and described above.

Editing Log Data

This tutorial will cover feature of LogView++ to deal with las file, including import, export, doing calculation of log data, making partial log, and combining log data.. This is the basic operation that everybody need to understand before dealing with complicated graphical plotting and cross-sectioning.

Format File
Supported format file in LogView++ version 2012.2 is still LAS 2.0. Other LAS version might resulting unexpected result. LAS 2.0 must have at least the following keywords in the header file:

~Version Information
VERS. 2.0:
WRAP. NO:
~Well Information
~Curve Information
DEPT. :
~Other information
~A

Remarks:
~Version Information, gives the version of the LAS format and wrapping mode. Make sure the format is 2.0. Wrapping true means that the data (in the ~A section) in the log is formatted in multi-line rather than single line.
~Well Information, usually includes the well identification like well name, start depth of log and etc.
~Curve Information, should includes all column data name exists in the file. At least, it should contain DEPT.
~A or ~Asci Data Section, is the final section that filled up with all numerical values of the log data. Number of column must be equal to the number of column defined in the ~Curve Information.

Basic Operation of LAS File
Importing LAS File
This is simple. But, be AWARE, some people made a mistake by choosing wrong menu. Please choose menu “Log Data” and “Import”. DO NOT USE MENU FROM “Project” or “Well” !!!!!!

After clicking that menu, browse a valid LAS file, and open. You will be prompted with this dialog..

Give a name, and decide whether this imported log would be a part of specific well or just create new well for it. This null number is actually magic number that is defined to accommodate the NULL number in log file. Default value is -999.25 (I don’t know why somebody choose that strange number.. 🙂 )
Just click OK and done!!.

Exporting LAS File
It can be done simply by going to menu “Log Data” and select “Export”. You must be prompted by a dialog. Select the proper well and the log, and export. Done.. Nothing complicated.

Renaming, Duplicating, and Deleting the Log
Right click in the main data tree as shown below, select Setting for renaming, Duplicate for duplicating, and surely Delete for deleting.
You must noted that deleting a log data or anything would be allowed in case of the data is not being used by any of window or editor.

Showing Imported Las File
To show the imported LAS File, simply go to tab Log Editor, then select well name and las name to be shown. Correct operation should give this kind of screenshot.

This log editor shows the tree of data available in the log, table of all data, and also statistic data of each column that should be useful for determining the limit of value in the next plotting procedure.

Editing Imported Las File
Rename & Delete Column
It can be simply done by right click the tree of log data and select menu rename or delete…

Create Partial Log
Creating a part of log sometimes is very important especially if we want to calculate a certain interval that have a very different property compared to whole log interval. To do that, right click tree data, and select “Create Partial Log”. You will get to this kind of dialog.
Those dialog is example if we want to make a partial log of the existing log data, only for the first 100 rows, and only for column SP, GR, and DEPT. By clicking “Create”, you will have new partial log data in the same well as the original log from. To show the partial log, just do select the new well log in the log editor window.

Advance Calculator
I call it advance because of this is probably the most difficult operation and the most useful feature in this editing the Las file chapter. Right click on tree, and select menu “Advance Calculator”. And you will see this kind of dialog.

This dialog contain 3 parts which are formula history, variables, and formula to be calculated. The formula history shows any formula that you ever calculate previously. To re-calculate again the previous calculation, just double click the history and you will get your formula in the form.

Variables shows all data column available in the selected las file and its aliases. For example, in above picture, rows no-1 shows X0 and DEPT1. That means the column name is DEPT1 and the alias is X0. !!!PLEASE BE CAREFUL!!!. You are only allowed to use the alias in the formula, not the real name.

In the formula section, it has operator, variable name, and formula itself. Operator is operator.. 🙂 like +, – , log, and etc. Variable name is the expected result column name. and the formula is of course the equation to be calculated. We can write formula single line or multi-line format. And it could be a very complicated formula if you wish. Please take a look at this example formula.

single line formula:
if(X0>1000 & X1!=-999.25, X1/100, -999.25)
——————————————
it should clearly explained.. 🙂

multi-line formula:
A:=X0;
B:=X1;
C:=A+B;
C
——————————————
first and second line, we make new sub variable called A & B.
third line, C is derived from A & B
last line, C is return as final result.
We can also write as follows…
——————————————
A:=X0;
B:=X1;
A+B
——————————————
those 2 example will give same result & same meaning actually.. 🙂 If you you want to know more about the supported operator, please click “More” for further documentation. After formula is ready, click “Execute”, and you will have new column data in the table. Enjoy it..

Combining Two Log Data
Combining two log data is also one of the difficult task to do since sometime a little bit confusing. More over, I have no enough time to test this feature. So, probably you will encounter an unexpected bug while doing this.

For example, we have 2 partial data like this:
Las File – 1:

Las File – 2:

We want to combined those two files to become one file for simplicity.

To do that, go to menu bar “Log Data” and select “Combine LAS Files”. By doing that, you will be prompted by this kind of dialog. Browse LAS File – 1 and 2 from the dialog. By default, in case of data intersection occur, it will used data from LAS File-1. But actually you can change it to LAS File – 2 as well.

Once two LAS Files ready, click “Add Column” and select the appropriate column pairs for those two LAS Files. Figure below shows how to add 4 column in the targeted merged file. In the first 2 pictures, it shows pairs that both Las File – 1 and 2 are having the column. In the second row, the GR column is not available in the Las File-2. So we can choose NULL for that. The ILD is also not available in the Las File – 1. So we can also choose the NULL for that.

After all columns are ready, last but the most important thing is that we must specify the Key Column. This is the column that both Las File-1 and 2 have it and will be used for reference of merging. Ideally, this Key Column should be the DEPT since we want to merge mainly for the depth.

After we finish the merging setup. Click execute and you will prompted to save the resulted file. And you can imported to the LogView++ to compare the result with the data source. Doing the correct procedure should give this kind of result.

This is the end of this tutorial. Should anybody have question, please don’t hesitate to contact my email.
——————————————————————–

Written by Sugiyanto Suwono
Bekasi, March 12, 2013

Introduction to LogView++
(see also LogView++ Presentation)

Graphical User Interface:

LogView++ is basically a kind of petrophysical software that commonly used to manipulate LAS data that is resulted from oil & gas well logging. In the first version (2010.12), it was developed mostly to helps engineer, geologist, or petrophysicist to do a single well log plotting. However, in the latest version (2012.2), LogView++ has been extended by some feature such as plotting completion, zonation / layering, and also cross-sectioning. In this tutorial, version used for explanation is 2012.2.

Generally, the graphical interface of LogView++ is divided into 3 areas. The first area is the main menu bar (ribbon bar) that contain many of icons that give you direct link to many features in LogView++. Following pictures are all tool bar available in the ribbon bar.

This LogView++ file management is based on project file. Above “Project” ribbon bar lets you open, save, and close the project. And this ribbon also allows you to see the diagnostic log in order to understand some hidden message delivered by LogView++.

Above “Well” menu enables you to make new well, as well as import and export well header from file.

Above “Log Data” menu bar deals everything related to log (LAS File) data.

Zonation menu is dealing with everything about zone or layers or well top.

Completion ribbon bar gives an access to completion editing, including completion database management.

Log template menu of course deal with log template.

And the last bar, helps give you access to main documentation of LogView++ and about dialog.

File Type Supported:
There are some file formats that are currently supported by LogView++ as follows.
– Project File (*.pro++)
– LAS File (*.las)
– Well header (text file *.*)
– Completion Package (text file *.*)
– Log template (*.template)
– Zone list (text file *.*)

LogView++ Main Features:
Following list is the main feature that currently supported by LogView++…