OpendTect User Documentation version 3.2
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4.5. Manage


Manage Toolbar

4.5.1. Description

OpendTect keeps track of different files imported into or created by the system. Deleting, renaming and, in the case of seismic files, also merging of files is controlled from the "Manage" menu. Seismic file, horizon, and well management is called from this menu.

4.5.2. Seismic file management window



Seismic files can be Moved to another Location , Renamed , Locked , Removed , Copied , Merged
, Browse/edit cube locations , or, in case you selected a 2D lineset, Managed and you can dump the 2D geometry .

4.5.2.1. Copy cube data window



Any volume can be copied into a new volume. All essential parameters (sub volume selection, storage type, optimization direction, scaling and null trace handling) can be set in the Copy Cube data window.

4.5.2.2. Merge files window



If, for any reason, sub-cubes need to merged into one big cube, it can be done with this option. For example, OpendTect processing time can be reduced by distributing batch jobs (volume output) over multiple computers. This process can either be done automatically or manually. In the latter case, processing jobs are submitted to process sub-volumes on different remote computers. When all jobs are finished, the sub-volumes can be merged into a merged volume using this Merge files option.

Select the input files from the multiple entry list and specify the Output file name. You can remove the original files at a later stage using the remove button in the seismic file manager.

4.5.2.3. Browse/Edit Cube Locations


An extension of 3D surveys to edit the cube locations, positions, trace samples, etc. For instance, if you choose to edit any position, you can quickly go to that position by pressing GoTo button.


4.5.2.4. Manage 2D seismic lines

The lines within the selected lineset are displayed on the left, and when selecting a line, the attributes that are available to that line are shown on the right. The lines can be renamed, and the attributes can be renamed and deleted. If all attributes are deleted from a line, the line is automatically fully removed from the lineset, too.

When you select multiple lines on the left, the attributes that are available to all selected lines are shown on the right. In this manner, you can rename and remove entire collections of attributes simultaneously.

4.5.2.5. Dump 2D geometry



With this module, you can generate an ascii file with the geometry of one or all 2D lines in the current lineset. By default, the output file just contains the X and Y location of each trace of each line. Optionally, the trace number (loaded it from the original file) can be included as the first column. Optionally, you can output a Z value in the last column of the output file.

This export facility may be very practical when you want to generate a basemap of your 2D lines in a different software package.

4.5.2.6. Volume sub-selection


This standard menu is available when importing and exporting a volume, line, or horizon, copying a cube or horizon, or processing an attribute.

In all those processes, the output might be limited with respect to the available input data. The limitation may be:

4.5.2.7. Pre-stack seismic manager



This icon on the upper left corner of the seismic manager opens the pre-stack seismic manager.



Pre-stack data stores are present on disk in a folder containing one file per inline/line. This allows faster access to the files. The manager will display information about the entire folder: Folder name, number of files, ...

The options on the right are similar to the options present in all managers.

4.5.3. Horizon file management window

On the left, the available horizons are displayed. On the right, the available attributes linked to the horizon selected on the left are displayed. At the bottom, information on the selected horizon is displayed. At the base of the window the available disk space is noted, as well the date when the horizon was last modified.



Horizons can be renamed, locked, removed, copied, or their disk location can be changed. Attributes can be removed with the bin button on the far right.

Moreover, you can define a stratigraphic level of horizon by pressing Stratigraphy button. In the next pop-up window, you will see the name of stratigraphic surface and its relation to defined stratigraphy of the area/basin. The general stratigraphic levels and the subsequent units can be defined from Manage Stratigraphy.



The relationship between horizons (horizon crossings) can be checked and solved by pressing Relations button. This option is very useful in SSIS. Therefore, before creating a chronostratigraphy, a user can fix the horizon crossings from horizon management as well.

4.5.4. Well management window



The available wells in the project are shown on the left. Wells can be moved to a different disk location, renamed, locked, and removed with one of the buttons in the center of the window. When a well is selected, the available logs to that well are displayed on the right. These logs can be renamed, removed, or exported with the buttons on the far right. For removal and export, multiple logs can be selected. Other relevant information is indicated at the bottom of the window.

Tip. For ease of use in a project, it is recommended to give your logs the same name across wells. For example, your master density log should be called RHOB in every well. Please note that both well names and log names are case sensitive.



Edit markers. Well markers can be displayed in a table by pressing the Edit markers button. Depth should be in Measured Depth (MD). Multiple markers can be inserted by choosing one of the options from the menu that pops-up on a right mouse click on an already defined well marker in the marker table. Markers can also be loaded from a file. The format in the marker file should be Depth - Marker name. The markers may have spaces in their names.





Edit Depth/Time Model. The individual time-depth nodes can be edited here. When Update display is pressed, the effect of the new time-depth model is shown in the display immediately.





Add logs. Logs can be added with the Add logs button. The file should be in LAS format, in either MD, or TVDSS. Alternatively, the log files can be pseudo-LAS, meaning LAS (with one line of data per depth value) with the header replaced by a one-line definition: "Depth Gamma Sonic" etc. Do not use quotes, names should be separated by blank characters (spaces or tabs). For both LAS and pseudo LAS, the following units can be recognized. The recognition process is case insensitive. In pseudo LAS, you have to put the units directly behind the log name in parentheses, e.g. Depth(ft) Density(g/cc).
Note. Please note that it is convenient to give the same name to a log in different wells, e.g. always use RHOB (case sensitive) for the primary density log. This makes log handling for consecutive processing easier since logs are selected based on their names.

If the user clicks on the export logs icon, then the following window will appear:




The user has to specify the depth range in meters and the step. Three output formats are available: by MD/value, XYZ/value, or ICZ/value. Depending on the the output choice, the output Z-unit can be in meters, feet, sec, or msec.

4.5.5. Pickset file management window



In this window, all available picksets are shown. When a pickset is selected, the properties of the pickset are displayed in the lower window. These picksets can be moved to a different location, they can be renamed, locked and unlocked, and removed by clicking one of the four buttons on the right side of the window. User can benefit by merging several pickset together by using Merge Pickset Button.

4.5.6. Wavelet management window

In this window, all available wavelet information is shown. In the left window, all available wavelets are shown. The active wavelet in the left window is visualized in the right window. The information on the properties of the active wavelet is shown in the lower window.



As shown above, there are several options. Each wavelet can be moved to a different location on disk, renamed, locked/unlocked, and removed by clicking one of the four buttons. Also, there is an option to import and to generate a wavelet.


Generate a wavelet

As shown above, two types of wavelets can be created. The first type is a "Ricker" wavelet; the second type is a "Sinc" wavelet. The Ricker type wavelet gives the smoothest output.

Import

First, the user needs to select an input file, and can examine this file to check for important information contained inside.

The next option is the file header. The user can chose between no header, fixed size, and variable. In case the user chooses fixed size, it is required to input the header size, which is the number of lines. If the user chooses variable, the user has to input the End-of-header 'word'. It is also possible to load a predefined setting for this option.

Next, the format of the data must be defined. Depending on the choice in the file header option, a different window will pop up when clicking on define.
The next step is to define the scale factor for samples, as default Opendtect chooses the value 1.
Finally. choose a new name for the Wavelet or choose a previously defined wavelet by clicking on Select

4.5.7. Manage Stratigraphy

Manage Stratigraphy window can be launched by pressing icon from OpendTect manage toolbar. The manage stratigraphy window will appear as shown below. This window is designed to arrange the stratigraphic intervals into its geological sub-units. The user can create a specific information about the project and the different stratigraphic levels of his/her interpretation. This window is organised as units/sub-units that are bounded by different stratigraphic levels. These levels define the top and base of each units. So, depending upon user's description, these levels (boundaries) can be the name of seismic horizons or the names of epochs/eras.




Add stratigraphic levels: At the right hand side of this window, stratigraphic levels are defined. This can be done by right-clicking inside the existing levels white area and selecting Create New option. Insert as many stratigraphic levels as needed.

Add units/sub units: On the left, the units are classified in a way that the top and base of each unit belong to certain stratigraphic levels. Right-click in the unit area and select Add unit. Mention the name, description and lithology of the unit. Right-click on newly created unit and select Specify level boundary. In new window as shown above, add the existing levels (boundaries). By following the same steps, we can insert sub-units of stratigraphic units as well.



Save as: The defined stratigraphy can also be saved at different levels, e.g. Survey levels, OpendTect data level, User level, or Global level. For instance, if it is saved as survey level, the stratigraphy will only be available for this survey.

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